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at 22:24:42 ut, the swift burst alert telescope (bat) triggered and located grb 220715b (trigger=1116441). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 254.889, -33.597 which is ra(j2000) = 16h 59m 33s dec(j2000) = -33d 35' 48" with an uncertainty of 3 arcmin (radius, 90% conta... | grb 220715b: swift detection of a burst |
"at 20:42:39.05 ut on 03 april 2022, the fermi gamma-ray burst monitor (gbm) triggered and located grb 220403b (trigger 670711364 / 220403863), which was also detected by the swift/bat and the swift/xrt (klingler et al. 2022, gcn 31820). additionally, the optical afterglow was detected by the swift/uvot (klingler et al... | grb 220403b: fermi gbm detection |
swift-xrt has performed follow-up observations of the swift/bat-guano-detected burst grb 220606b (tohuvavohu et al., gcn circ. 32167), collecting 4.9 ks of photon counting (pc) mode data between t0+44.9 ks and t0+68.8 ks. no credible x-ray afterglow candidate has been detected within the bat-guano error circle (tohuvav... | grb 220606b: swift follow-up observations |
continuing the recovery from the reaction wheel anomaly, swift has performed a follow-up observation of grb 220302a which occurred at 07:40:19 ut (troja et al., gcn 31661). the xrt began observing the field at 16:41:18.7 ut, 32459.3 seconds after the bat trigger. using promptly downlinked data we find an uncatalogued x... | grb 220302a: swift afterglow detection |
in this paper, we collect 54 gamma-ray burst (grb) afterglows rebrightening in x-ray, optical, and radio bands to build the biggest sample so far, of which 18 type-ic/b supernova (sn)-associated grbs have been deeply investigated. we confirm that the distribution of spectral luminosities of sn-associated grbs has a wid... | rebrightening properties of multi-wave band afterglows in grbs associated with supernovae |
classical gamma-ray bursts have two distinct emission episodes: prompt emission from ultra-relativistic ejecta and afterglow from shocked circumstellar material. while both components are extremely luminous in known gamma-ray bursts, a variety of scenarios predict the existence of luminous afterglow emission with littl... | ztf19abvizsw: a gamma-ray burst afterglow without a gamma-ray burst |
swift-xrt has performed follow-up observations of the fermi/gbm-detected burst grb 230812b in a series of observations tiled on the sky. the total exposure time is 8.3 ks, distributed over 27 tiles; the maximum exposure at a single sky location was 4.6 ks. the data were collected between t0+25.4 ks and t0+38.1 ks, and ... | grb 230812b: swift-xrt afterglow detection |
at 23:27:34 ut, the swift burst alert telescope (bat) triggered and located grb 230818a (trigger=1186032). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 285.883, +40.876 which is ra(j2000) = 19h 03m 32s dec(j2000) = +40d 52' 35" with an uncertainty of 3 arcmin (radius, 90% conta... | grb 230818a: swift detection of a burst |
even after more than half a century from the discovery of gamma-ray bursts (grbs), the observed emission mechanism of these energetic astrophysical phenomena is still an enigma. the spectroscopic study of the prompt emission of grbs provides valuable information, yet, alone is inadequate to discriminate between the mod... | grb spectropolarimetry science with astrosat |
"at 06:08:30.73 ut on 27 august 2023, the fermi gamma-ray burst monitor (gbm) triggered and located grb 230827b (trigger 714809315/230827256). the optical afterglow of grb 230827b was also detected by ztf (gcn 34574), git (gcn 34576), and ako (gcn 34579). the location of the afterglow is consistent with the gbm on-grou... | grb 230827b / grb 230827256: fermi gbm observation |
the veritas imaging atmospheric cherenkov telescopes at the fred lawrence whipple observatory in southern arizona have been performing rapid follow-up observations of gamma-ray bursts in the very high-energy (>100 gev) band since 2006. grb 221009a occurred near the time of the full moon on a day when veritas observa... | veritas observations of grb 221009a and other gamma-ray bursts |
at 16:43:59 ut, the swift burst alert telescope (bat) triggered and located grb 231205b (trigger=1200812). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 54.154, +27.146 which is ra(j2000) = 03h 36m 37s dec(j2000) = +27d 08' 47" with an uncertainty of 3 arcmin (radius, 90% contai... | grb 231205b: swift detection of a burst |
the detection of grb 170817 has offered a unique insight into the physics of binary neutron star mergers (bns), the production of short gamma-ray bursts (sgrb) jets, and their interaction with external media to produce an afterglow. using a publicly available model of afterglow light curves, named afterglow.py, we will... | modelling the afterglow and prompt emission of neutron star mergers |
relativistic jets are collimated outflows with speeds close to light speed, which are associated with gamma-ray bursts (grbs), active galactic nuclei (agns), and so on. this article mainly overviews recent developments of polarimetric studies of grbs and their afterglows in the gamma-ray and optical wavebands as well a... | polarimetric studies of grbs, agn jets, and axion dark matter |
the visible telescope (vt), which is the primary payload for the chinese-french space multi-band variable object monitor (svom) mission, is designed to observe the optical afterglow of gamma-ray bursts (grbs). while calibration is one of the key factors to validate that vt achieves its scientific objectives in terms of... | research on radiometric calibration of the svom visible telescope |
grb 070707 was the first short gamma-ray burst (grb) detected by integral and the optical afterglow was attributed to the prolonged activity of the central engine in the literature. here, we reanalyse the afterglow data and examine the physical origin of the emission. the redshift of this burst is uncertain and in this... | the afterglow of grb 070707 and a possible kilonova component |
the not has a long tradition in the follow-up of gamma-ray bursts, starting with observations of the very first afterglow back in 1997. focus has been both on the physics of these events and their use as probes of the distant universe. twenty-five years later, the not has become a major worldwide contributor to this fi... | relativistic explosions from the not |
grb 160509a was discovered by the fermi lat on 2016 may 09 at 08:59:04.36 utc (longo+ 2016gcn..19403...1l). we observed the afterglow with the vla starting at 0.36 days. we tracked the flux density of the afterglow over multiple epochs spanning 1.2-33.5ghz, using 3c48, 3c286, and 3c147 as flux and bandpass calibrators,... | vizier online data catalog: grb 160509a vla monitoring campaign results (laskar+, 2016) |
at 00:43:13 ut, the swift burst alert telescope (bat) triggered and located grb 180618a (trigger=842475). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 169.937, +73.848 which is ra(j2000) = 11h 19m 45s dec(j2000) = +73d 50' 52" with an uncertainty of 3 arcmin (radius, 90% contai... | grb 180618a: swift detection of a burst with an optical counterpart |
supernovae (sne), kilonovae (kne), tidal disruption events (tdes), optical afterglows of gamma ray bursts (grbs), and many other optical transients are important phenomena in time-domain astronomy. fitting the multi-band light curves (lcs) or the synthesized (pseudo-)bolometric lcs can be used to constrain the physical... | the uv excesses of supernovae and the implications for studying supernovae and other optical transients |
boxfit calculates light curves and spectra for arbitrary observer times and frequencies and of performing (broadband) data fits using the downhill simplex method combined with simulated annealing. the flux value for a given observer time and frequency is a function of various variables that set the explosion physics (e... | boxfit: gamma-ray burst afterglow light curve generator |
gamma ray bursts (grbs) represent one of the most fascinating topics in astrophysics. despite huge steps forward have been computed during the last two decades in our understanding of their origin, still a number of open questions need to be answered. among the most compelling ones there is the nature of the remnant co... | on the grb x-ray afterglow plateau origin |
fast radio bursts (frbs) are extra-galactic origin milli-second duration bright radio bursts. theoretically, frbs may produce optical counterparts with durations from milliseconds to hours. the frb optical counterparts may be detectable in future large field telescopes in china, including the china space station survey... | detectability of fast radio burst optical counterparts with the future chinese wide field telescopes |
gamma-ray bursts (grbs) are fascinating events due to their panchromatic nature. we study optical plateaus in grb afterglows via an extended search into archival data. we comprehensively analyze all published grbs with known redshifts and optical plateaus observed by many ground-based telescopes (e.g., subaru telescope... | the optical two and three-dimensional fundamental plane correlations for nearly 180 gamma-ray burst afterglows with swift/uvot, ratir, and the subaru telescope |
gamma-ray bursts (grbs) are the most luminous electromagnetic burst in the universe. they occur when a rapidly rotating massive star collapses or a binary neutron star merges. these events leave a newborn central compact object, either a black hole or neutron star, which launches relativistic jets that emit the luminou... | neutrinos from gamma-ray bursts |
at 04:42:52 ut, the swift burst alert telescope (bat) triggered and located grb 191024a (trigger=931242). swift slewed to the burst after a delay to clear the earth limb observing constraint. the bat on-board calculated location is ra, dec 10.147, -67.139 which is ra(j2000) = 00h 40m 35s dec(j2000) = -67d 08' 21" with ... | grb 191024a: swift detection of a burst |
time resolved characterization of plasma x-ray emission represents an innovative technique to characterize non-equilibrium phases in electron cyclotron resonance ion sources (ecris). indeed, although ecris plasmas are usually in dynamical equilibrium, many relevant phenomena are characterized by fast transients and req... | time resolved x-ray emission diagnostics in an axis-symmetric simple mirror trap |
neutron star mergers result in the formation of an accretion disk that evolves on timescales much longer than the orbital time, thereby ejecting mass that contributes to the r-process kilonova transient. it is widely accepted that angular momentum transport in astrophysical disks is mediated by magnetic turbulence, but... | long-term grmhd simulations of neutron star merger accretion disks |
at 22:26:10 ut, the swift burst alert telescope (bat) triggered and located grb 230628e (trigger=1177054). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 171.841, -11.447 which is ra(j2000) = 11h 27m 22s dec(j2000) = -11d 26' 47" with an uncertainty of 3 arcmin (radius, 90% conta... | grb 230628e: swift detection of a burst |
we propose a strategy for detecting and analyzing optical afterglows (oas) of long gamma-ray bursts (grbs) without the need to obtain their light curves. this approach is useful for the gaia satellite, which provides sampled optical ultra-low-dispersion spectroscopic observations of the sky. for this purpose, we show t... | perspectives of observing the color indices of optical afterglows of gamma-ray bursts with esa gaia |
gamma-ray bursts (grbs), which have isotropic energy up to $10^{54}$ erg, would be the ideal tool to study the properties of early universe: including dark energy, star formation rate, and the metal enrichment history of the universe. we will briefly review the progress on the field of grb cosmology. meanwhile, x-ray f... | grb cosmology and self-organized criticality in grbs |
one of the most energetic gamma-ray bursts grb 110731a, was observed from optical to gev energy range by fermi and swift observatories, and by the moa and grond optical telescopes. the multiwavelength observations over different epochs (from trigger time to more than 800 s) showed that the spectral energy distribution ... | the early afterglow and magnetized ejecta present in grb 110731a |
at 21:23:31 ut, the swift burst alert telescope (bat) triggered and located grb 191031d (trigger=932608). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 283.275, +47.639 which is ra(j2000) = 18h 53m 06s dec(j2000) = +47d 38' 19" with an uncertainty of 3 arcmin (radius, 90% contai... | grb 191031d: swift detection of a short hard burst |
in this talk we propose that coherent radio emission of young energetic pulsars and some millisecond pulsars is produced in the magnetospheric current sheet. magnetic reconnection in the pulsar sheet proceeds in the plasmoid-dominated regime. collisions of plasmoids with each other and with the upstream magnetic field ... | pulsar radio nanoshots as a low-frequency afterglow of relativistic magnetic reconnection |
this table records high-level information for each swift observation and provides access to the data archive. each record is associated with a single observation that contains data from all instruments on board swift. the bat is the large field of view instrument and operates in the 10-300 kev energy band. the narrow f... | vizier online data catalog: swift master catalog (heasarc, 2004-) |
gamma ray bursts (grbs) are extreme explosions that occur randomly in the universe. they release more energy in seconds than what the sun emits in its entire lifetime. we present a study focusing on grb afterglow flares; what are they? why do they occur? how are they related to the prompt grb itself? in order to begin ... | gamma-ray bursts light curve fitting with swift xrt |
the rapid infrared imager/spectrograph (rimas) is an instrument designed to observe gamma ray burst afterglows. dispersion in the moderate resolution mode (r 4000) is provided by znse grisms: one covering the y and j bands and the other covering the h and k. each has a clear aperture of 44 mm. for the hk grism the blaz... | machining of znse grisms for the rapid infrared imager spectrograph (rimas): effect of diamond crystal orientation |
long gamma-ray burst grb 151027a was observed by all three detectors onboard the swift spacecraft, and many more, including maxi, konus-wind and fermi gbm/lat instruments. this revealed a complex structure of the prompt and afterglow emission, consisting of a double-peak gammaray prompt with a quiescent period and a hr... | structure of the prompt emission of grb 151027a within the fireshell model |
a class of long gamma-ray bursts (grbs) presenting light curves with an extended plateau phase in their x-ray afterglows obey a two parameter correlation (dainotti et al. 2008) betweenthe rest frame end time of the plateau, t_a, and its corresponding x-ray luminosity, l_{a}. this correlation is a useful tool towards co... | a fundamental plane for gamma ray bursts with x-ray plateaus |
searches for electromagnetic counterparts of gravitational-wave signals have redoubled since the first detection in 2017 of a binary neutron star merger with a gamma-ray burst, optical/infrared kilonova, and panchromatic afterglow. yet, one ligo/virgo observing run later, there has not yet been a second, secure identif... | data-driven expectations for electromagnetic counterpart searches based on ligo/virgo public alerts: cluster scripts |
gamma ray bursts (grbs) are the the most luminous electromagnetic events known to occur throughout the universe. these violent explosions produce relativistic jets in a short burst of prompt emission and are followed by an afterglow emitted across the electromagnetic spectrum. during the afterglow, there are periods of... | a search for structure in gamma ray burst x-ray flares confirming whether they are similar to the three pulse structure found in propt emission pulses |
at 01:40:46 ut, the swift burst alert telescope (bat) triggered and located grb 170331a (trigger=744791). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 323.782, -24.414, which is ra(j2000) = 21h 35m 08s dec(j2000) = -24d 24' 48" with an uncertainty of 3 arcmin (radius, 90% conta... | grb 170331a: swift detection of a burst |
thanks to many space-borne detectors such as the swift and fermi satellites and numerous ground-based followed-up telescopes, gamma-ray bursts (grbs) are now quickly covered in virtually every wavelength in the electromagnetic spectrum. covering the energy range above 30 mev, the fermi-lat has seen more than a hundred ... | gamma-ray bursts in the one of the last frontiers: the 10-100 gev energy band |
the recent discovery of gw170817 the first gravitational-wave detection where we also observed electromagnetic signals has enabled new studies of merging compact objects. what have we since learned about the radiation that emerges from these collisions?signs of a mergerbefore gw170817 was observed, our models predicted... | piecing together the light from colliding stars |
at 17:49:01 ut, the swift burst alert telescope (bat) triggered and located grb 190611a (trigger=907950). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 324.769, -56.082 which is ra(j2000) = 21h 39m 05s dec(j2000) = -56d 04' 54" with an uncertainty of 3 arcmin (radius, 90% contai... | grb 190611a: swift detection of a burst |
swift-xrt has performed follow-up observations of the integral-detected burst grb 200914a (mereghetti et al. gcn circ. 28419), collecting 3.2 ks of photon counting (pc) mode data between t0+8.9 ks and t0+49.2 ks. one uncatalogued x-ray source has been detected consistent with being within 148 arcsec of the integral pos... | grb 200914a: swift-xrt observations |
swift-xrt has performed follow-up observations of the fermi-gbm and swift/bat (guano)-detected burst grb 200714e (gcn circs. 28098 and 28103), collecting 2.2 ks of photon counting (pc) mode data between t0+37.3 ks and t0+44.5 ks. one uncatalogued x-ray source has been detected, it is below the rass limit and shows no d... | grb 200714e: swift-xrt observations |
at 09:58:51 ut, the swift burst alert telescope (bat) triggered and located grb 201001a (trigger=998344). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 110.070, -2.210 which is ra(j2000) = 07h 20m 17s dec(j2000) = -02d 12' 36" with an uncertainty of 3 arcmin (radius, 90% contain... | grb 201001a: swift detection of a burst |
at 21:33:41 ut, the swift burst alert telescope (bat) triggered and located grb 191004b (trigger=927839). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 49.177, -39.613, which is ra(j2000) = 03h 16m 42s dec(j2000) = -39d 36' 46" with an uncertainty of 3 arcmin (radius, 90% contai... | grb 191004b: swift detection of a burst with an optical counterpart |
since its commissioning at eso's very large telescope in 2009, the x-shooter spectrograph has become the reference instrument in gamma-ray burst (grb) afterglow spectroscopy. during this time our collaboration has collected more than 70 spectra of grb afterglows, with redshifts ranging from 0.06 to 6.3. thanks to their... | the x-shooter sample of grb afterglow spectra: properties of the absorption features |
at 14:58:34 ut, the swift burst alert telescope (bat) triggered and located grb 190719c (trigger=915381). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 240.210, +12.977 which is ra(j2000) = 16h 00m 50s dec(j2000) = +12d 58' 39" with an uncertainty of 3 arcmin (radius, 90% contai... | grb 190719c: swift detection of a burst |
swift-xrt has performed follow-up observations of the fermi/lat-detected burst grb 200524a (fana dirirsa et al. gcn circ. 27797), collecting 5.0 ks of photon counting (pc) mode data between t0+36.4 ks and t0+55.7 ks. four uncatalogued x-ray sources are detected, of which one ("source 6") is believed to be the afterglow... | grb 200524a: swift-xrt afterglow detection |
at 07:36:49 ut, the swift burst alert telescope (bat) triggered and located grb 200219a (trigger=957271). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 342.644, -59.108 which is ra(j2000) = 22h 50m 35s dec(j2000) = -59d 06' 29" with an uncertainty of 3 arcmin (radius, 90% contai... | grb 200219a: swift detection of a short burst |
gamma-ray bursts (grbs) by virtue of their high luminosities are observed up to redshift z=9.4 (cucchiara et al. 2011), far beyond the most distant quasars orgalaxies. and thus have the potential to be vital cosmological probes of earlier processes in theuniverse, such as reionization, evolution of the star formation r... | use of supervised machine learning for determination of redshifts of gamma-ray bursts |
we observed again the optical afterglow of the bright, low-redshift grb 180728a (starling et al., gcn 23046; lipunov et al., gcb 23048; rossi et al., gcb 23055) with the eso vlt ut2 equipped with the x-shooter spectrograph. | grb 180728a: no evidence of sn in early vlt/x-shooter spectra |
gamma-ray burst (grb) afterglow modeling has long relied on only synchrotron emission to calculate the broadband spectrum and light-curves. although this works for many afterglows, certain physical conditions would require that synchrotron self-compton (ssc) effects be considered to properly describe the afterglow emis... | beyond synchrotron effects in gamma-ray burst afterglows |
at 17:10:03 ut, the swift burst alert telescope (bat) triggered and located grb 190821a (trigger=921722). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 250.077, -34.022 which is ra(j2000) = 16h 40m 18s dec(j2000) = -34d 01' 16" with an uncertainty of 3 arcmin (radius, 90% contai... | grb 190821a: swift detection of a burst |
the distribution of jet angles for short gamma-ray bursts (sgrbs) is critical to constrain because it directly affects the true energy scale and event rate. the event rate is of particular interest in the gravitational wave era. our current knowledge of the jet angle distribution comes almost exclusively from x-ray obs... | the late-time x-ray behavior of short gamma-ray bursts: implications for energetics and rates |
the vla sky survey (vlass) is an ongoing project by the nrao to map ~34,000 deg2 of the sky at 3ghz, over 3 epochs spanning 6 years. in preparation for the full survey, a set of fields covering 2480 deg2 was recently observed as the vlass pilot project. we searched 1333 deg2 of the vlass pilot for radio transients with... | radio transients in 1333 deg2 of the vla sky survey pilot |
gamma ray bursts (grbs) are the most luminous explosions in the universe. these electromagnetic explosions produce jets demonstrated by a short burst of prompt gamma-ray emission followed by a broadband afterglow. there are sharp increases of flux in the x-ray light curves known as flares that occurs in about 50% of th... | gamma-ray burst x-ray flares light curve fitting |
we observed the field of grb 180620a (swift trigger 843211; evans et al., gcn #22807) simultaneously in g'r'i'z'jhk with grond (greiner et al. 2008, pasp 120, 405) mounted at the 2.2 m mpg telescope at eso la silla observatory (chile). observations started at 04:35 ut on 2018-06-21, 20 hours after the grb trigger. they... | grond observations of grb 180620a |
short duration gamma-ray bursts (grbs) are brief flashes of gamma-ray radiation followed by a longer lasting, broadband (from radio to x-rays) afterglow emission. nasa's swift mission provided breakthrough observations connecting these high-energy transients to the coalescence of two compact objects. short grbs are the... | an x-ray view of short duration gamma-ray bursts |
at 11:11:51 ut, the swift burst alert telescope (bat) triggered and located grb 180630a (trigger=845443). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 48.810, -87.482 which is ra(j2000) = 03h 15m 14s dec(j2000) = -87d 28' 54" with an uncertainty of 3 arcmin (radius, 90% contain... | grb 180630a: swift detection of a burst with an optical counterpart |
the 60 cm bootes-5/javier gorosabel telescope at observatorio astronómico nacional in san pedro mártir (méxico) automatically responded to the swift trigger of grb 170519a (ukwatta et al., gcn 21106). the first unfiltered images (60 s exposures) were obtained at 05:15:08.9 ut (5 min after the burst). at the position of... | grb 170519a: bootes-5/jgt early optical detection |
synchrotron radiation from shock accelerated electrons has been well established as the source of the broadband afterglow emission accompanying gamma-ray bursts (grbs). the relativistic electrons producing this emission are expected to also produce synchrotron self-compton (ssc) emission, yet no convincing evidence has... | fermi observations of high energy emission from grb 190114c |
we propose to continue our previous commensal transients project that has so far resulted in the best limits yet on radio transient rates (rowlinson et al. 2016). many types of variable and transient sources are predicted and observed at low frequencies. for example, flares from low-mass stars and brown dwarfs, magneta... | search for variable and transient sources in the eor fields with the mwa |
from the comprehensive statistical analysis of swift x-ray light-curves collected from the launch of the swift satellite until the end of 2010, we found a three-parameter correlation between the isotropic energy emitted in the rest frame 1-104 kev energy band during the prompt emission (eγ,iso), the rest frame peak of ... | ten years of swift: a universal scaling for short and long gamma-ray bursts (ex,iso - eγ,iso - epk) |
gamma-ray bursts are exploding massive stars and some of the most luminous explosions in the universe. they can serve as powerful light houses that probe the structure and abundances of the dense ism in their hosts at almost any redshift and not accessible by other types of observations, e.g. using quasars. since 2009 ... | structure and dynamics of star-forming galaxies across the history of the universe using grbs |
at 09:45:20 ut, the swift burst alert telescope (bat) triggered and located grb 190701a (trigger=912310). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 28.063, +58.906 which is ra(j2000) = 01h 52m 15s dec(j2000) = +58d 54' 23" with an uncertainty of 3 arcmin (radius, 90% contain... | grb 190701a: swift detection of a burst |
at 14:15:23 ut, the swift burst alert telescope (bat) triggered and located grb 191106a (trigger=933515). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 269.350, +46.052, which is ra(j2000)c = 17h 57m 24s dec(j2000) = +46d 03' 06" with an uncertainty of 3 arcmin (radius, 90% cont... | grb 191106a: swift detection of a burst |
svom is a french-chinese space mission to be launched in 2021, whose goal is the study of gamma-ray bursts, the most powerful stellar explosions in the universe. the micro-channel x-ray telescope (mxt) is an x-ray focusing telescope, on board svom, with a field of view of 1 degree (working in the 0.2-10 kev energy band... | localization algorithms for micro-channel x-ray telescope on board svom space mission |
we present a correlation observed in both the optical and x-ray afterglows of long duration gamma-ray bursts (grbs), between the initial luminosity (measured at restframe 200s) and average afterglow decay rate. this correlation does not depend on the presence of specific light curve features and is potentially applicab... | exploring the behaviour of long gamma-ray bursts with intrinsic afterglow correlations |
swift-xrt has performed follow-up observations of the fermi/lat-detected burst grb 170522a (arimoto et al. gcn circ. 21127) in a series of observations tiled on the sky. the total exposure time is 4.7 ks, distributed over 5 tiles; the maximum exposure at a single sky location was 3.3 ks. the data were collected between... | grb 170522a: swift-xrt observations |
at 02:45:47 ut, the swift burst alert telescope (bat) triggered and located grb 170705a (trigger=760064). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 191.705, +18.293 which is ra(j2000) = 12h 46m 49s dec(j2000) = +18d 17' 35" with an uncertainty of 3 arcmin (radius, 90% contai... | grb 170705a: swift detection of a burst with an optical counterpart |
at 05:10:02 ut, the swift burst alert telescope (bat) triggered and located grb 170519a (trigger=753445). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 163.450, +25.378 which is ra(j2000) = 10h 53m 48s dec(j2000) = +25d 22' 41" with an uncertainty of 3 arcmin (radius, 90% contai... | grb 170519a: swift detection of a burst with an optical counterpart |
a class of long gamma-ray bursts (grbs) with a plateau phase in their x-ray afterglows obeys a three-dimensional (3d) relation (dainotti et al. 2016), between the rest-frame time at the end of the plateau, ta, its corresponding x-ray luminosity, la, and the peak luminosity in the prompt emission, lpeak. we extended the... | a study of the gamma-ray burst fundamental plane |
we review the current observational and theoretical status of the polarization measurements of gamma-ray bursts at all wavelengths. gamma-ray bursts are thought to be produced by an ultra-relativistic jet, possibly powered by a black hole. one of the most important open point is the composition of the jet: the energy m... | gamma-ray bursts polarization |
we investigate nucleosynthesis inside the gamma-ray burst (grb) accretion disks formed by the type ii collapsars and outflows launched from these disks. we deal with accretion disks having relatively low accretion rates: 0.001m_ ⊙ s^{ - 1} ≲ dot m ≲ 0.01m_ ⊙ s^{ - 1} and hence they are predominantly advection dominated... | nucleosynthesis in the gamma-ray burst accretion disks and associated outflows |
we present two very rare cases of short grbs with a shallow decay phase in the optical afterglow: grb 130912a and grb 150424a. we interpret the light curves and seds in the context of the fireball model. | grb 130912a and grb 150424a: two short gamma ray bursts with a plateau phase in the optical after-glow challenge the compact binary merger scenario |
as the universe's most luminous transient events, long gamma-ray bursts (grbs) are observed at cosmological distances. the afterglow emission generated by the burst's interaction with the surrounding medium presents the opportunity to study the local environment, as well as intervening systems. the transient nature of ... | fast-response optical and near-infrared grb science with ratir and rimas |
gamma ray burst (grb's), extremely energetic flashes of gamma rays, are caused by either deaths of massive unstable stars or colliding binary neutron stars. a unique burst, grb 150518a, had two recorded bursts fifteen minutes apart which is very rare and is considered to be ultra-long, lasting around thirty minutes tot... | gamma ray burst 150518a measured at different wavelengths |
gamma-ray bursts (grbs) are the most luminous events in the universe with egamma,iso ∼ 1048-54 erg. leading models hypothesize that grbs are created from inter- nal collisions within collimated and ultrarelativistic jets. the jets then shock-heat the surrounding material (e.g. interstellar medium) to create grb aftergl... | gamma-ray bursts: lighting up the high-redshift universe |
swift-xrt has performed follow-up observations of the maxi-detected burst grb 190804b (sato et al. gcn circ. 25262) in a series of observations tiled on the sky. the total exposure time is 1.3 ks, distributed over 7 tiles; the maximum exposure at a single sky location was 395 s. the data were collected between t0+37.2 ... | grb 190804b: swift-xrt observations |
at 09:52:16 ut, the swift burst alert telescope (bat) triggered and located grb 190926a (trigger=926515). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 100.599, +59.511 which is ra(j2000) = 06h 42m 24s dec(j2000) = +59d 30' 40" with an uncertainty of 3 arcmin (radius, 90% contai... | grb 190926a: swift detection of a burst |
since the historic aug. 17, 2017 simultaneous detection of gravitational and electromagnetic waves produced by the merger of two neutron stars, the gw-grb 170817 event, interest in short gamma-ray bursts (sgrbs) has increased exponentially. sgrbs (bursts with durations less than 2.0 seconds) represent only about 10 % o... | analysis of recent short grb afterglow light curves |
at 14:46:39 ut, the swift burst alert telescope (bat) triggered and located grb 190824a (trigger=922107). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 215.329, -41.902, which is ra(j2000) = 14h 21m 19s dec(j2000) = -41d 54' 07" with an uncertainty of 3 arcmin (radius, 90% conta... | grb 190824a: swift detection of a burst |
with the discovery of the first binary neutron star (bns) merger (gw170817) and its electromagnetic counterpart, grb 170817a and the subsequent kilonova and afterglow, we have fully entered the multi-messenger era of astrophysics. using the burst and transient source experiment (batse) and swift-burst alert telescope (... | gamma-ray bursts similar to grb 170817a: comprehensive search in the batse and swift data |
the discovery of gravitational waves resulting from the merger of two massive black holes (gw150914) has revolutionized our view of merging compact binaries. more recently, the swope supernova survey of the optical counterpart of a gravitational wave event in the ngc 4993 galaxy, gw170817, emanating from the merger of ... | merger of compact binaries in the context of gravitational waves and short-lived gamma-ray bursts |
at 00:01:19 ut, the swift burst alert telescope (bat) triggered and located grb 191228a (trigger=946476). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 5.339, -8.670, which is ra(j2000) = 00h 21m 21s dec(j2000) = -08d 40' 12" with an uncertainty of 3 arcmin (radius, 90% containm... | grb 191228a: swift detection of a burst |
at 14:57:15 ut, the swift burst alert telescope (bat) triggered and located grb 190604b (trigger=906654). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 297.587, -32.932 which is ra(j2000) = 19h 50m 21s dec(j2000) = -32d 55' 56" with an uncertainty of 3 arcmin (radius, 90% contai... | grb 190604b: swift detection of a burst |
at 04:07:18 ut, the swift burst alert telescope (bat) triggered and located grb 190613a (trigger=908288). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 182.559, +67.233 which is ra(j2000) = 12h 10m 14s dec(j2000) = +67d 13' 58" with an uncertainty of 3 arcmin (radius, 90% contai... | grb 190613a: swift detection of a burst with an optical counterpart |
swift has carried out 449 observations of the lvc error region for the gw trigger s191110af, using the 'cwb' gw localisation map. because this was a 'burst' pipeline trigger with a high frequency, observations were weighted towards the galactic plane.the observations currently span from 10 ks to 88 ks after the lvc tri... | ligo/virgo s191110af: swift xrt observations, no secure afterglow found |
swift has performed further observations of the field of the maxi/gsc-detected burst grb 190708b (kawabuko et al., gcn 25037). an additional 3.4 ks of data were collected between 5.96 days and 6.11 days after the maxi trigger. source 1, initially reported by tohuvavohu et al. (gcn 25053) as the likely x-ray counterpart... | grb 190708b: confirmation of the x-ray afterglow |
swift-xrt has performed further follow-up observations of the gbm-detected burst grb 200325b (fermi gbm team, gcn cir. 27441), collecting overall 4.6 ks of photon counting (pc) mode data between t0+102.4 ks and t0+505.5 ks. the uncatalogued x-ray source (source 1) reported in d'avanzo et al. (gcn circ. 27457) has faded... | grb 200325b: further swift-xrt observations |
long grb 190114c, identified on january 14th, 2019, was the first gamma-ray burst that substantially violated the defined 10 gev energy limit of the synchrotron model, with an observed emission between 0.2 - 1 tev and a low redshift of z = 0.425. this paper analyzes its immediate afterglow broadband spectrum from 10$^{... | immediate afterglow physical characteristics and broadband spectra evidence synchrotron self-compton emission as the reason for vhe production in tev grb 190114c |
recent detections of gamma-ray bursts (grbs) at energies above 100 gev demonstrate that imaging atmospheric cherenkov telescopes (iacts) operating in the very-high-energy range (vhe; e > 100 gev) can provide insights into the physics of grbs. by searching for the highest-energy photons emitted by grbs, these telesco... | the veritas gamma-ray burst follow-up program |
we present an observational approach for the independent detection of the prompt optical emission of long gamma-ray bursts (grbs). for this purpose, we explore the potential of the large array survey telescope (last). this array of small optical telescopes can be used to scan a wide region of the sky, and to focus on a... | detecting the prompt optical flashes of gamma-ray bursts with small telescope arrays |
distinct x-ray plateau and flare phases have been observed in the afterglows of gamma-ray bursts (grbs), and most of them should be related to central engine activities. in this paper, we collect 174 grbs with x-ray plateau phases and 106 grbs with x-ray flares. there are 51 grbs that overlap in the two selected sample... | vizier online data catalog: energies of x-ray plateaus and flares in grbs (yi+, 2022) |
following the swift/bat trigger of grb 201015a (d'elia et al., gcnc 28632), the 0.3m bootes-1b robotic telescope in mazagon (huelva), southern spain, automatically responded to this burst. a series of images were taken starting on 15 oct at 22:50:48ut (35 s after trigger). we confirm the ot reported by master (lipunov ... | grb 201015a: bootes-1 early optical afterglow detection |
gamma-ray bursts (grbs) are interesting objects for testing the emission models in highly energetic regimes and are very promising standardizable candles, given their observability at high redshift (up to $z=9.4$) that allows the extension of the hubble diagram much further the limit of supernovae ia (sne ia), the most... | the two-dimensional and three-dimensional relations in the plateau emission in multi-wavelengths |
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