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since the lp-nova models were proposed, and the short gamma-ray burst (sgrb) afterglows were confirmed, people have actively made searches for the evidence of the existence of lp-novae among the optical (or near-infrared) counterparts of sgrbs. in this paper, we first summarize these observational progresses before 201... | research developments in li-paczyński novae (ii): observational aspect |
at 19:07:13 ut, the swift burst alert telescope (bat) triggered and located grb 210702a (trigger=1058804). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 168.570, -36.741 which is ra(j2000) = 11h 14m 17s dec(j2000) = -36d 44' 28" with an uncertainty of 3 arcmin (radius, 90% conta... | grb 210702a: swift detection of a burst with a bright optical counterpart |
the work describes an investigation of afterglow of various luminophores under influence of pulsed x-ray radiation of nanosecond duration. as a source of radiation a pulsed x-ray “yasen 01” apparatus is applied. maximum impulse current of an x-ray tube is 300 a. maximum electron energy is 120 kev. half-height pulse dur... | research of luminophores afterglow under influence of pulsed x-ray radiation of nanosecond duration |
two neutron stars merge somewhere in the universe approximately every 10 to 100 seconds, creating explosions potentially observable in gravitational waves and across the electromagnetic spectrum. these observations are in- trinsically connected to the fate of the merger. this thesis focuses on using these different sig... | the observational signatures of nascent neutron stars |
strong spectral softening has been revealed in the late x-ray afterglows of some gamma-ray bursts (grbs). the scenario of x-ray scattering around the circumburst dusty medium has been supported by previous works due to its overall successful prediction of both the temporal and spectral evolution of some x-ray afterglow... | on the late-time spectral softening found in x-ray afterglows of gamma-ray bursts |
at 09:18:18 ut, the swift burst alert telescope (bat) triggered and located grb 210822a (trigger=1069788). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 304.476, +5.265 which is ra(j2000) = 20h 17m 54s dec(j2000) = +05d 15' 54" with an uncertainty of 3 arcmin (radius, 90% contai... | grb 210822a: swift detection of a burst with an optical afterglow |
context. the short burst grb 130912a was detected by swift, fermi satellites, and several ground-based optical telescopes. its x-ray light curve decayed with time normally. the optical emission, however, displayed a long-term plateau.aims: we examine the physical origin of the x-ray and optical emission of short grb 13... | the long-lasting optical afterglow plateau of short burst grb 130912a |
this paper presents a catalogue of gamma-ray bursts (grbs) that were detected by the instruments onboard the lomonosov space observatory. the lomonosov mission gave the first experience of not only multi-wavelength (from optical to gamma) observations of grbs but also multi-messenger observations of extreme phenomena a... | lomonosov grb catalogue: the first experience of prompt emission multi-wavelength observations |
grb 130427a was the most luminous gamma-ray burst detected in the last 30 years. with an isotropic energy output of 8.5 × 10 53 erg and redshift of 0.34, it combined very high energetics with a relative proximity to earth in an unprecedented way. sensitive x-ray observatories such as xmm-newton and chandra have detecte... | challenging the forward shock model with the 80 ms follow up of the x-ray afterglow of gamma-ray burst 130427a |
a widely accepted model for producing gamma-ray bursts (grbs) is based on the dissipation of an ultra-relativistic jet. synchrotron emission is believed to be the dominant radiation process for the main emission components of grbs, i.e. prompt gamma-rays, reverse shock emission and afterglow. although the presence of s... | magnetic fields in gamma-ray bursts and their polarised emission |
for four types of grbs, namely high-luminosity, low-luminosity, standard and failed grbs, we calculated their radio afterglow light curves. meanwhile, considering contributions from host galaxies in radio bands, we statistically investigated the effect of hosts on radio afterglows. it is found that a tight anti-correla... | gamma-ray bursts: radio afterglow and host galaxy study with the fast telescope |
being the most extreme explosions in the universe, gamma-ray bursts (grbs) provide a unique laboratory to study various plasma physics phenomena. the complex light curve and broad-band, non-thermal spectra indicate a very complicated system on the one hand, but, on the other hand, provide a wealth of information to stu... | plasmas in gamma-ray bursts: particle acceleration, magnetic fields, radiative processes and environments |
we try to identify the nature of high redshift long gamma-ray bursts (lgrbs) host galaxies by comparing the observed abundance ratios in the interstellar medium with detailed chemical evolution models accounting for the presence of dust. we compared measured abundance data from lgrb afterglow spectra to abundance patte... | the nature of grb host galaxies from chemical abundances |
we present x-ray and optical observations of the short duration gamma-ray burst grb 071227 and its host at z = 0.381, obtained using swift, gemini south, and the very large telescope. we identify a short-lived and moderately bright optical transient, with flux significantly in excess of that expected from a simple extr... | an unusual transient following the short grb 071227 |
we consider a sample of 107 gamma-ray bursts (grbs) for which early ultra-violet emission was measured by swift and extrapolate the photon intensity to lower energies. protons accelerated in the grb jet may interact with such photons to produce charged pions and subsequently ultra high energy neutrinos {\varepsilon }ν ... | ultra-high energy neutrinos from gamma-ray burst afterglows using the swift-uvot data |
compact binary mergers, with neutron stars or neutron star and black-hole components, are thought to produce various electromagnetic counterparts: short gamma-ray bursts (grbs) from ultra-relativistic jets followed by broadband afterglow; semi-isotropic kilonova from radioactive decay of r-process elements; and late ti... | low-γ jets from compact binary mergers as candidate electromagnetic counterparts to gravitational wave sources |
one of the central scientific goals of the next-generation cherenkov telescope array (cta) is the detection and characterization of gamma-ray bursts (grbs). cta will be sensitive to gamma rays with energies from about 20 gev, up to a few hundred tev. the energy range below 1 tev is particularly important for grbs. cta ... | posytive -- a grb population study for the cherenkov telescope array (icrc-2019) |
accretion on to black holes powers some of the most luminous objects in the universe. in this thesis i present a series of works aimed at constraining the properties of black hole accretion in a variety of astrophysical systems. numerical methods are vital for studying the multi-scale and non-linear physics of these sy... | numerical simulations of black hole accretion |
i review how polarization signals have been discussed in the research field of gamma-ray bursts (grbs). i mainly discuss two subjects in which polarimetry enables us to study the nature of relativistic jets. (1) jet breaks: gamma-ray bursts are produced in ultra-relativistic jets. due to the relativistic beaming effect... | polarized emission from gamma-ray burst jets |
the combo-relation is a tight relation involving the prompt emission spectral peak energy ep,i and the x-ray afterglow plateau luminosity l0 and its rest-frame duration τ, and the late power-law decay index α. to explain its features, in this work we investigate the external shock scenario, i.e. the synchrotron emissio... | physical insight into the combo-relation |
long-duration gamma-ray bursts (grbs) are excellent probes to study dust extinction due to their occurrence in star-forming regions and having simple synchrotron emission spectra. inclusion of spectroscopic data to the grb x-ray to the infrared spectral energy distribution (sed) could better define the continuum and co... | grb afterglows: dust extinction properties from the low to high redshift universe |
at 04:43:57 ut, the swift burst alert telescope (bat) triggered and located grb 210226a (trigger=1034721). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 124.138, +57.577 which is ra(j2000) = 08h 16m 33s dec(j2000) = +57d 34' 38" with an uncertainty of 3 arcmin (radius, 90% conta... | grb 210226a: swift detection of a burst |
in 1977, blandford and znajek showed how the spin energy of a rotating black hole may be extracted electromagnetically through a magnetic field that threads the black hole horizon. a characteristic feature of this mechanism is that, under certain fairly general conditions, the energy loss rate decays exponentially. we ... | the signature of the blandford-znajek mechanism in grb light curves |
we present the statistics of the ratio, r, between the prompt and afterglow “plateau” fluxes of gamma-ray bursts (grbs). we define this as the ratio of the mean prompt energy flux in swift bat and the swift xrt one, immediately following the steep transition between these two states and the beginning of the afterglow s... | the statistics of bat-to-xrt flux ratio in grbs: evidence for a characteristic value and its implications |
the space-based multi-band astronomical variable objects monitor (svom) project is a dedicated satellite developed at the cooperation of china and france, aim to make prompt multi-band observations of gamma-ray bursts (grbs), the afterglows and other high-energy transient astronomical events. the visible telescope (vt)... | the visible telescope onboard the chinese-french svom satellite |
phenomenological properties of gamma-ray bursts (grb) are briefly reviewed and observations of grb optical afterglow and other transients in abastumani astrophysical observatory are discussed. in particular, the catalog of observations in 2012-2015, and some results including the final photometry of the optical aftergl... | observations of gamma-ray bursts in abastumani observatory |
afterglows of gamma-ray bursts (grbs) from population iii (pop iii) stars could reveal the formation history and properties of these first generation stars. through detailed simulation, we predict the prospects of detecting these afterglows with a range of established, existing and upcoming telescopes across the spectr... | multiwavelength detectability of pop iii grbs from afterglow simulations |
at 11:26:59 ut, the swift burst alert telescope (bat) triggered and located grb 210104a (trigger=1015873). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 103.705, +64.661 which is ra(j2000) = 06h 54m 49s dec(j2000) = +64d 39' 39" with an uncertainty of 3 arcmin (radius, 90% conta... | grb 210104a: swift detection of a burst with a bright optical counterpart |
on june 25-29, 2020, during its second sky survey, srg/erosita discovered a new x-ray source srge j195057.5+672122 at ra=19:50:57.5 dec=67:21:21.5 (j2000) with a 95% error radius of 4.1 arcsec. | x-ray and optical transient srge j195057.5+672122: a possible nearby grb afterglow/hypernova |
at 03:53:57 ut, the swift burst alert telescope (bat) triggered and located grb 210306a (trigger=1035994). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 129.965, +60.196 which is ra(j2000) = 08h 39m 52s dec(j2000) = +60d 11' 46" with an uncertainty of 3 arcmin (radius, 90% conta... | grb 210306a: swift detection of a burst with a bright optical counterpart |
we investigate the expected radio emission from short grbs, guided by the observed distributions of their afterglow parameters. our motivation is to explore the radio signatures of the forward and reverse shock in a sgrb jet, as well as the off-axis jet component and radio emission from the dynamical ejecta. we estimat... | science with an ngvla: radio emission from short gamma-ray bursts in the multi-messenger era |
we report on the first open-use based atacama large millimeter/submm array (alma) 345 ghz observation for the late afterglow phase of grb 131030a. the alma observation constrained a deep limit at 17.1 d for the afterglow and host galaxy. we also identified a faint submillimeter source (alma j2300-0522) near the grb 131... | alma and ratir observations of grb 131030a |
we present design status of the microchannel x-ray telescope, the focussing x-ray telescope on board the sino- french svom mission dedicated to gamma-ray bursts. its optical design is based on square micro-pore optics (mpos) in a lobster-eye configuration. the optics will be coupled to a low-noise pnccd sensitive in th... | the microchannel x-ray telescope status |
the galactic magnetar sgr 1935+2154 is currently known to be in an active state and has shown flaring activity in the x-ray bands in recent past (palmer et al., atel #13675; younes et al., atel #13678; barthelmy et al., gcn #27657; nakahira et al., gcn #27661). | a ugmrt search for low-frequency persistent radio emission and afterglow from sgr 1935+2154 |
as the central engine of gamma-ray bursts (grbs), a nascent magnetar can release its rotational energy by magnetic dipole radiation. this energy is injected into the outflow of the grb jet. with the rapid evolution of the magnetic inclination angle, the perpendicular component of the magnetar's surface magnetic field d... | two x-ray plateaus of gamma-ray bursts: energy injection from nascent magnetars with an evolving magnetic inclination angle |
the chandra x-ray observatory re-observed the field of gw170817 starting on may 3rd, 2018 as part of its on-going monitoring program (pi: wilkes). observations were split into two exposures of 50.7 ks and 46 ks, respectively. | chandra observations of gw170817 reveal a fading afterglow |
the neutron-rich matter ejected by compact object mergers (neutron star-neutron star merger and neutron star-black hole merger) provides one of the most important environments for the syntheses of r-process elements. in recent seventeen years, theoretical studies suggested that the energy produced during the decay of r... | research developments in li-paczyński novae (i): theoretical aspect |
we obtained spectroscopic observations of the optical counterpart (izzo et al., gcn #29066, jelinek et al., gcn #29070) of the magic-detected (blanch et al., gcn #29075) grb 201216c (beardmore et al., gcn #29061, malacaria et al., gcn #29073, nadella et al., gcn #29074) with the eso very large telescope ut 3 (melipal) ... | grb 201216c: vlt x-shooter spectroscopy and potential high redshift of a vhe-emitting grb |
gamma-ray burst (grb) optical and x-ray afterglow luminosity is expected to correlate with the grb isotropic equivalent kinetic energy of the outflow in the standard synchrotron model for grb afterglows. previous studies, using prompt grb isotropic equivalent energy (eiso) as a proxy for isotropic equivalent kinetic en... | selection biases in the gamma-ray burst eiso - lopt, x correlation. |
in previous papers it was shown that gamma rays with characteristics similar to those of the gamma-ray bursts (grbs) observed by astronomers may arise from suitably shaped nonuniformities in the big bang in a quasi-spherical szekeres (qss) model. the gamma radiation arises by blueshifting the light emitted by hydrogen ... | short-lived flashes of gamma radiation in a quasi-spherical szekeres metric |
grb 110709b presented a peculiar three-peak lightcurve; this burst twice triggered the bat detector onboard swift. the two triggers were separated by ∼10 min. in order to explain such an event, we unify into a single description the millisecond (ms) protomagnetar and the collapsar central-engine models. we find that su... | three-peak grbs and their implications for central engines |
thanks to the advances in robotic telescopes, time domain astronomy leads to a large number of transient events detected in images every night. data mining and machine learning tools used for object classification are presented. the goal is to automatically classify transient events for both further follow-up by a larg... | machine learning search for gamma-ray burst afterglows in optical images |
we use the correlation relation between the energy emitted by the grbs in their prompt phases and the x-ray afterglow fluxes, in an effort to constrain cosmological parameters and aiming to construct a hubble diagram at high redshifts, i.e. beyond those found with type ia supernovae. | determination of cosmological parameters from gamma ray burst characteristics and afterglow correlations |
we observed the position of grb 201015a (d'elia et al., gcn 28632) with the chandra x-ray observatory with epochs 8.4 and 13.6 days after trigger. the x-ray afterglow is clearly detected with a flux around 100x brighter than expected based on the extrapolation of the early xrt data taken between 0.03 and 0.8 days after... | grb 201015a: late x-ray detections with chandra |
using the data set from t-239 to t+963 sec from the recent telemetry downlink, we report further analysis of bat grb 201015a (trigger #1000452) (d'elia et al., gcn circ. 28632). the bat ground-calculated position is ra, dec = 354.310, 53.446 deg which is ra(j2000) = 23h 37m 14.4s dec(j2000) = +53d 26' 45.0" with an unc... | grb 201015a: swift-bat refined analysis (a soft short pulse with a tail emission) |
here we give an overview of the follow-up campaign of the gamma-ray bursts. and then we give an introduction about gwac project which is aiming to detect the prompt emission with high-cadence photometry and large field of view monitoring. besides, we also present our plan to search for the associated counterparts of gr... | the observations of grb afterglows and the plan to search for optical counterparts of gravitational wave events |
if all long gamma-ray bursts (grbs) are related to supernovae core-collapse supernovae (sne) explosions indeed, then a long grb is the collapse of a massive star core or the beginning of an axially symmetric explosion of sn, and the long grbs must always be accompanied by an sn explosion (of ib/c type or other types of... | the core collapse supernovae, gamma-ray bursts and sn 1987a |
it is shown that the basic observed properties of the gamma-ray bursts (grbs) are accounted for if one assumes that the grbs arise by blueshifting the emission radiation of hydrogen and helium generated during the last scattering epoch. the blueshift generator for a single grb is a region with a nonconstant bang-time f... | cosmological blueshifting may explain the gamma ray bursts |
global robotic net (lipunov et al., 2010, advances in astronomy,vol.2010, 30l) observed extremaly bright (3.7062e-04 erg/cm^2, ttrig=2019-05-30 10:19:08.9ut, bissaldi et al. gcn #24692) (gbm team gcn #24676, balrog biltzinger et al.gcn #24677, lat longo et al. gcn #24679 and ipn localization; gamma-ray transient also d... | master ot j080207.73+352847.7 discovery - optical afterglow of very bright grb190530a |
we examine the expected radio emission from short grbs detectable by the ngvla, guided by the observed distributions of their afterglow parameters. we give estimates for the peak emission from both the forward and reverse shock, as well as the late-time off-axis jet emission. in the context of neutron star merger model... | radio emission from short gamma-ray bursts in the multi-messenger era |
we report the optical observations of grb 121011a by the 0.8m tnt facility at xinglong observatory, china. the light curve of the optical afterglow shows a smooth and featureless bump during the epoch of ∼130 s and ∼5000 s with a rising index of 1.57 ± 0.28 before the break time of 539 ± 44 s, and a decaying index of a... | optical light curve of grb 121011a: a textbook for the onset of grb afterglow in a mixture of ism and wind-type medium |
electrons accelerated in relativistic collisionless shocks are usually assumed to follow a power-law energy distribution with an index of p. observationally, although most gamma-ray bursts (grbs) have afterglows that are consistent with p > 2, there are still a few grbs suggestive of a hard (p < 2) electron energ... | modeling the multiband afterglows of grb 060614 and grb 060908: further evidence for a double power-law hard electron energy spectrum |
extragalactic x-ray absorption and optical extinction are often found in gamma-ray burst (grb) afterglows, and they could be tracers of both circumburst and host galaxy environments. by performing spectral analyses of the spectral energy distribution of nine short grb (sgrb) afterglows with a known redshift, we investi... | systematic study for gas-to-dust ratio of short gamma-ray burst afterglows |
observations of gamma-ray burst (grb) afterglows have long provided the most detailed information about the origin of this spectacular phenomenon. the model that is most commonly used to extract physical properties of the event from the observations is the relativistic fireball model, where ejected material moving at r... | low-energy electrons in gamma-ray burst afterglow models |
the afterglow of a gamma-ray burst (grb) can give us valuable insight into the properties of its host galaxy. to correctly interpret the spectra of the afterglow we need to have a good understanding of the foreground interstellar medium (ism) in our own galaxy. the common practice to correct for the foreground is to us... | exploring the pattern of the galactic h i foreground of grbs with the atca |
this paper is written in occasion of the marcel grossmann award i received at the 13th marcel grossmann meeting held in stockholm in 2012 july 2-7. i review the story of the bepposax discovery of the gamma ray burst afterglow and cosmological distance determination, starting from the first grb detection with vela satel... | grb afterglow discovery with bepposax: its story 15 years later |
we discuss two historical afterglows (grb 920723 and 920925c) prior to the afterglow era that started in 1997. we show how the use of both the 6-meter bta in zelenchuk (russia) and 10.4-m gtc in la palma (spain) have benefited the study of grb afterglows and their host galaxies. moreover, when completed with our bootes... | gamma-ray bursts: historical afterglows and early-time observations |
it has been reported that some x-ray spectra of gamma-ray burst (grb) afterglows cannot be fitted by a simple power law. a blackbody component is added to precisely fit the thermal feature in these spectra. alternatively, we propose that bremsstrahlung radiation can also be one possible mechanism to explain the thermal... | is bremsstrahlung a possible mechanism to explain the thermal feature in the grb 130925a x-ray afterglow? |
the relativistic external shock model of gamma-ray burst (grb) afterglows has been established with five free parameters, i.e., the total kinetic energy e, the equipartition parameters for electrons {{ɛ }}{{e}} and for the magnetic field {{ɛ }}{{b}}, the number density of the environment n and the index of the power-la... | revisiting gamma-ray burst afterglows with time-dependent parameters |
we develop a numerical formalism for calculating the distribution with energy of the (internal) pairs formed in a relativistic source from unscattered mev-tev photons. for gamma-ray burst (grb) afterglows, this formalism is more suitable if the relativistic reverse shock that energizes the ejecta is the source of the g... | optical flashes from internal pairs formed in gamma-ray burst afterglows |
the rebrightening phenomenon is an interesting feature in some x-ray, optical, and radio afterglows of gamma-ray bursts (grbs). here, we propose a possible energy-supply assumption to explain the rebrightenings of radio afterglows, in which the central engine with multiple active phases can supply at least two grb puls... | radio afterglow rebrightening: evidence for multiple active phases in gamma-ray burst central engines |
the class of long gamma-ray bursts (lgrbs) is associated with the collapse of the most massive stars, making them a tool to investigate star formation in the early universe. furthermore, thanks to their exceptional brightness, lgrb afterglows can be used as extra-galactic background sources capable of unveiling the pro... | gamma-ray bursts as tracers of star-formation rate and metallicity evolution with theseus |
galactic foreground hydrogen column density was estimated from hi 21cm surveys, the planck all-sky and akari all-sky data in the direction of the long gamma-ray burst grb 051022, a member of the large grb ring. intrinsic hydrogen column densities were derived from fitting the x-ray afterglow spectrum using all the vari... | gamma-ray burst parameters and the fine structure of the galactic ism as seen by akari |
we present a method to estimate the jet opening angles of long duration gamma-ray bursts (grbs) using the prompt gamma-ray energetics and a correlation between the time-integrated peak energy of the grb prompt spectrum and the collimation-corrected energy in gamma rays. the derived jet opening angles using this method ... | estimating long grb jet opening angles and rest-frame energetics |
our understanding of gamma-ray bursts (grbs) has come a long way in the past fifty years since their first detection. we now know that grbs arise in distant galaxies and that there are at least two distinct sub-classes, the long-duration class being produced by some rare massive star core collapse and the short-duratio... | gamma-ray bursts progress and problems |
the rapid infrared imager/spectrograph (rimas) is an instrument designed to observe gamma ray burst afterglows following initial detection by the swift satellite. operating in the near infrared between 0.9 and 2.4 μm, it has capabilities for both low resolution (r 25) and moderate resolution (r 4000) spectroscopy. two ... | technique for diamond machining large znse grisms for the rapid infrared/imager spectrograph (rimas) |
we propose to substantially expand our capabilities of modeling relativistic flows of magnetized plasma by merging the uahuntsville-developed multi-scale fluid-kinetic simulation suite and the advanced relativistic mhd (rmhd) code mrgenesis developed in the university of valencia. combined, these will allow us to perfo... | a new rmhd code for astrophysical applications |
the rapid infrared imager-spectrometer (rimas) is a near-infrared (nir) imager and spectrometer that will quickly follow up gamma-ray burst afterglows on the 4.3-meter discovery channel telescope (dct). rimas has two optical arms which allows simultaneous coverage over two bandpasses (yj and hk) in either imaging or sp... | h2rg detector characterization for rimas and instrument efficiencies |
transcontinental e-vlbi observations were conducted in june 2008 with telescopes in australia, china and japan. detections were made of the radio-loud quasar pks b0727-115, which shows superluminal motion, and the intra-day variable quasar pks b0524+034. the latter source was used as a phase reference calibrator for ob... | e-vlbi observations of grb 080409 afterglow with an australasian radio telescope network |
in these proceedings, we summarise the exploration so far of the relationship between the afterglow luminosity (measured at rest frame 200s; log l 200 s ) and average afterglow decay rate (measured from rest frame 200s onwards, α > 200 s ) of long duration gamma-ray bursts (grbs), first reported in the optical/uv li... | exploring the behaviour of long gamma-ray bursts with intrinsic afterglow correlations: log l200s‑α>200s |
while the afterglow phase of gamma-ray bursts (grbs) has been extensively measured, detections of prompt emission (i.e. during bright x-gamma emission) are more limited. some prompt optical measurements are regularly made, but these are typically in a single wide band, with limited time resolution, and no measurement o... | measurement of the shape of the optical-ir spectrum of prompt emission from gamma-ray bursts |
we present and examine a correlation observed in both the optical and x-ray afterglows of long duration swift gamma-ray bursts, between the initial luminosity, measured at rest frame 200s, and average afterglow decay rate. | exploring the behaviour of long gamma-ray bursts with intrinsic afterglow correlations |
we compared the time (or time limit) of onset for optical afterglow emission to the γ-ray variability v in 76 gamma-ray bursts with redshifts. in the subset (25 cases) with the rise evident in the data, we fit the shape of the onset peak as well and compared the rising and decaying indices to v. we did not find any evi... | a search for correlations between gamma-ray burst variability and afterglow onset |
in this thesis i will test the fireball model for grb afterglows. first, i compare different analysis methods and implementations of the model, using data of the "textbook" afterglow of grb 081121a. afterwards, i apply a model based on hydro-dynamical simulations to a sample of short-duration grb afterglows. finally, i... | applying the fireball model to short gamma-ray burst afterglows: methods, jet opening angles and plateau phases |
swift-xrt has performed follow-up observations of the swift/bat-guano-detected burst grb 220710a, collecting 4.4 ks of photon counting (pc) mode data between t0+242.5 ks and t0+287.4 ks. an uncatalogued x-ray source is detected consistent with being within 197 arcsec of the swift/bat-guano position and is above the 2sx... | grb 220710a: swift-xrt afterglow detection |
many high-energy astrophysical sources accelerate electrons to relativistic velocities, resulting in broadband emission from synchrotron and other radiation processes. gamma-ray burst afterglow observations provide a unique probe of electron acceleration due to the relativistic nature of their collimated outflows. the ... | probing electron acceleration in gamma-ray burst afterglows |
the merger of two compact objects neutron stars or black holes could be accompanied by a sudden, immediate flash of radio emission, according to predictions. can an array of antennas in california help us spot these signals?artists impression of two merging neutron stars producing a gamma-ray burst. [national science f... | catching radio signals from colliding objects |
swift/bat did not localize grb 220310c onboard (t0: 2022-03-10t22:23:51 utc, fermi/gbm gcn 31735). the fermi notice, distributed in near real-time, triggered the swift mission operations center operated gamma-ray urgent archiver for novel opportunities (guano; tohuvavohu et al. 2020, apj, 900, 1). upon trigger by this ... | grb 220310c: swift/bat-guano candidate arcminute localization |
at 23:20:21 ut, the swift burst alert telescope (bat) triggered and located grb 220521a (trigger=1107466). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 275.197, +10.384 which is ra(j2000) = 18h 20m 47s dec(j2000) = +10d 23' 03" with an uncertainty of 3 arcmin (radius, 90% conta... | grb 220521a: swift detection of a burst |
the analysis of 176 grb afterglow plateaus observed by swift with known redshifts revealed that the subsample of long grbs associated with sne (grb-sne), composed of 19 grbs, presents a very high correlation coefficient between luminosity at the end of the plateau phase lx (ta) = la and the end time of the plateau ta*,... | gamma-ray bursts with afterglow plateau phases associated with supernovae |
at 02:28:17 ut, the swift burst alert telescope (bat) triggered and located grb 221110a (trigger=1136936). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 29.119, -27.314 which is ra(j2000) = 01h 56m 29s dec(j2000) = -27d 18' 50" with an uncertainty of 3 arcmin (radius, 90% contai... | grb 221110a: swift detection of a burst with an optical counterpart |
gamma-ray burst (grb) afterglow emission can be observed from sub-tev to radio wavelengths, though only 6.6% of observed grbs present radio afterglows. we examine grb radio light curves (lcs) to look for the presence of radio plateaus resembling the plateaus observed at x-ray and optical wavelengths. we analyze 404 grb... | examining two-dimensional luminosity-time correlations for gamma-ray burst radio afterglows with vla and alma |
at 14:48:34 ut, the swift burst alert telescope (bat) triggered and located grb 230216a (trigger=1154815). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 113.966, -8.015 which is ra(j2000) = 07h 35m 52s dec(j2000) = -08d 00' 53" with an uncertainty of 3 arcmin (radius, 90% contai... | grb 230216a: swift detection of a burst |
we observed the field of grb 230815a (klingler et al., gcn 34434; mailyan et al. gcn 34440) with the eso very large telescope, equipped with the hawk-i near-infrared camera. observations consisted of two epochs of 20 min exposure in the h band at 23:19:53 ut on 2023-08-15 (~12.5 hr after trigger) and 23:15:46 ut on 202... | grb 230815a: vlt/hawk-i near-infrared afterglow detection |
at 12:53:33 ut, the swift burst alert telescope (bat) triggered and located grb 170629a (trigger=759159). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 130.016, -46.587 which is ra(j2000) = 08h 40m 04s dec(j2000) = -46d 35' 11" with an uncertainty of 3 arcmin (radius, 90% contai... | grb 170629a: swift detection of a burst |
at 13:53:15 ut, the swift burst alert telescope (bat) triggered and located grb 220430a (trigger=1104692). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 97.611, +9.510 which is ra(j2000) = 06h 30m 27s dec(j2000) = +09d 30' 36" with an uncertainty of 3 arcmin (radius, 90% contain... | grb 220430a: swift detection of a burst or swift j0630.4+0932 |
recent space- and ground-based studies of the circumgalactic medium (cgm) around nearby galaxies have revealed the dynamic interplay between the galaxy ecosystem and surrounding cgm using bright background quasars. here, we extend this investigation to higher redshifts by using the bright afterglows of gamma-ray bursts... | probing the circumgalactic medium in the early universe using grb afterglows |
with the first discovery of a ns merger detected with gravitational wavefacilities, and ongoing detections of sgrbs detected with gamma-raysatellites, it is a golden era to make significant progress in mergerstudies. a critical link between these populations is the production ofrelativistic jets, and the fraction of me... | xmm-newton observations of jets in short gamma-ray bursts |
long-duration gamma-ray bursts (grbs) are associated with the explosions of massive stars and are accordingly expected to reside in star-forming regions with molecular gas (the fuel for star formation). previous searches for co, a tracer of molecular gas, in grb host galaxies did not detect any emission. molecules have... | gamma-ray bursts from dusty regions with little molecular gas |
we report here the discovery by the intermediate palomar transient factory (iptf) of iptf14yb, the first unambiguous detection of an afterglow-like transient identified outside the γ-ray bandpass. subsequent to our discovery announcement, the ``parent'' γ-ray burst grb 140226a was identified by the interplanetary netwo... | iptf14yb: the first grb discovered outside the gamma-ray bandpass and the rate of orphan afterglows |
swift-xrt has performed follow-up observations of the swift/bat-guano-detected burst grb 220708b, collecting 1.7 ks of photon counting (pc) mode data between t0+35.1 ks and t0+36.8 ks. an uncatalogued x-ray source is detected and is above the rass 3-sigma upper limit at this position, and is therefore likely the grb af... | grb 220708b: swift-xrt afterglow detection |
at 11:20:23 ut, the swift burst alert telescope (bat) triggered and located grb 200519a (trigger=973140). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 255.334, -30.380 which is ra(j2000) = 17h 01m 20s dec(j2000) = -30d 22' 47" with an uncertainty of 3 arcmin (radius, 90% contai... | grb 200519a: swift detection of a burst with an optical afterglow |
when two neutron stars merged in august of 2017, telescopes around the world watched the fireworks that came next. but its not just the seconds and minutes after merger that can teach us about what happened! hubble observations of the afterglow a year later are now providing new clues.a wealth of observationslate-time ... | clues from hubble a year after a neutron-star merger |
at 13:25:33 ut, the swift burst alert telescope (bat) triggered and located grb 180514a (trigger=832368). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 197.401, +36.969 which is ra(j2000) = 13h 09m 36s dec(j2000) = +36d 58' 10" with an uncertainty of 3 arcmin (radius, 90% contai... | grb 180514a: swift detection of a burst |
swift-xrt has performed follow-up observations of the integral-detected burst grb 200424a (mereghetti et al. gcn circ. 27634), collecting 5.0 ks of photon counting (pc) mode data between t0+13.2 ks and t0+30.7 ks. one uncatalogued x-ray source has been detected consistent with being within the integral position, howeve... | grb 200424a: swift-xrt observations |
at 13:49:40 ut, the swift burst alert telescope (bat) triggered and located grb 180624a (trigger=844192). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 318.071, -2.332, which is ra(j2000) = 21h 12m 17s dec(j2000) = -02d 19' 55" with an uncertainty of 3 arcmin (radius, 90% contai... | grb 180624a: swift detection of a burst |
we report the first constraints on the putative radio emission of srge j195057.5+672122, reported as a possible gamma-ray burst (grb) afterglow/hypernova (sazonov et al. atel #13987) with a fading optical emission (perley, atel #13989; zaznobin et al. atel #13990). | vlass constraints on the radio afterglow of the grb afterglow/hypernova candidate srge j195057.5+672122 |
gamma-ray burst (grb) afterglows have long played a key role in our understanding of the physics of grbs. the recent detection of the electro-magnetic counterparts including an afterglow jet to a neutron star merger indicate that this will remain so in the future. with the detection of grb 170817a, afterglow observatio... | recent developments in gamma-ray afterglow theory |
at 19:24:34 ut, the swift burst alert telescope (bat) triggered and located grb 180510a (trigger=831810). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 276.318, -31.911 which is ra(j2000) = 18h 25m 16s dec(j2000) = -31d 54' 38" with an uncertainty of 3 arcmin (radius, 90% contai... | grb 180510a: swift detection of a burst |
at 19:38:05 ut, the swift burst alert telescope (bat) triggered and located grb 200729a (trigger=984929). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 184.375, +45.582 which is ra(j2000) = 12h 17m 30s dec(j2000) = +45d 34' 56" with an uncertainty of 3 arcmin (radius, 90% contai... | grb 200729a: swift detection of a burst |
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