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nicer observed the rapidly fading transient at2022cva (ho et al. gcn 31619) for 2.4 ks starting at 2022-02-21t22:56:03. x-rays are clearly detected above the background in the 0.3-5.0 kev band with a mean background-subtracted count rate of 0.92+-0.02 counts/seconds. | nicer x-ray detection of ztf22aabjpxh/at2022cva are consistent with a grb afterglow at z=0.293 |
at 03:15:35 ut, the swift burst alert telescope (bat) triggered and located grb 230325a (trigger=1161390). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 296.820, -46.094 which is ra(j2000) = 19h 47m 17s dec(j2000) = -46d 05' 38" with an uncertainty of 3 arcmin (radius, 90% conta... | grb 230325a: swift detection of a burst |
gw170817/grb 170817a has had a huge impact on our understanding of gamma-ray burst (grb) afterglows, and has prompted a huge sustained effort at modeling the details of the geometry and emission from grb jets. while no additional electro-magnetic counterparts have been detected to gravitational wave emission from neutr... | grb 170817a and the long-term aftermath of neutron star mergers |
in the first observed neutron star merger, gw170817, two dynamical components, mildly- and ultra-relativistic outflows were detected independently. the first component triggered a rapidly evolving thermal transient named macronova (kilonova), while the second caused an observed short grb where the early gamma-ray signa... | consequences of jet-ejecta interaction in neutron star mergers |
swift-xrt has performed follow-up observations of the fermi/lat-detected burst grb 231222b in a series of observations tiled on the sky. we point out that the burst was improperly named grb 231222a in gcn circ 35415, where the tiling was announced. the total exposure time is 4.1 ks, distributed over 4 tiles; the maximu... | grb 231222b: swift-xrt afterglow detection |
the gamma-ray bursts (grbs) with distinct thermal components are rarely detected, especially in cases with thermal components throughout the prompt phase. recently, fermi/gbm, swift/bat, and swift/xrt detected the special long-duration grb 190109a, which has four pulses in the prompt gamma-ray emission, i.e, pulse i (-... | distinct thermal emission from grb 190109a |
the full-frame images produced by the transiting exoplanet survey satellite (tess) are invaluable tools to detect periodic and transient astrophysical events, such as variable stars, supernovae, tidal disruption events, and gamma-ray burst afterglows. our pixel-level method separates the time-series ffis into smaller g... | using machine learning to detect transients in tess ffis |
we forecast the reionization history constraints, inferred from lyman-alpha damping wing absorption features, for a future sample of ~ 20 z > 6 gamma-ray burst (grb) afterglows using a fisher matrix analysis. we determine the expected constraints on the average neutral fraction after marginalizing over parameters de... | future constraints on the reionization history from grb afterglows |
swift-xrt has performed follow-up observations of the maxi-detected burst grb 221006a (mihara et al. gcn circ. 32626) in a series of observations tiled on the sky. the total exposure time is 1.9 ks, distributed over 3 tiles; the maximum exposure at a single sky location was 992 s. the data were collected between t0+37.... | grb 221006a: swift-xrt observations |
the study of gamma-ray burst (grb) afterglows across the electromagnetic spectrum can reveal a lot of information about their jets and surrounding environment. the physical parameters of the grb jet and emission processes at its shock front can be constrained by broad-band modeling, but individual parameters can in som... | making the most of radio peaks in gamma-ray burst afterglows |
gamma-ray bursts (grbs) are panchromatic phenomena by nature; their afterglow emissions are observed from sub-tev energies to radio wavelengths. in this work, we investigate grbs presenting the plateau feature in optical observations, inspired by the similarities with the plateau feature in x-ray observations. we analy... | the optical luminosity-time correlation for 102 gamma-ray burst afterglows |
grb 210205a was detected by the swift burst alert telescope (bat) at 11:11:17 ut on 5th feb 2021 (gcn 29397). the prompt emission mask-weighted bat light curve consists of a multi-peaked structure with a t90 duration of 22.70 +- 4.18 sec in 15-350 kev energy range (gcn 29409). we compare the reported value of bat fluen... | grb 210205a: observations with the 3.6m dot, a potential dark 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 |
at 06:36:50 ut, the swift burst alert telescope (bat) triggered and located grb 220412a (trigger=1102281). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 123.968, +30.322 which is ra(j2000) = 08h 15m 52s dec(j2000) = +30d 19' 19" with an uncertainty of 3 arcmin (radius, 90% conta... | grb 220412a: swift detection of a burst |
swift-xrt has performed follow-up observations of the swift/bat-guano-detected burst grb 210706a (tohuvavohu et al. gcn circ. 30393), collecting 2.8 ks of photon counting (pc) mode data between t0+43.3 ks and t0+50.7 ks. two uncatalogued x-ray sources are detected, of which one ("source 2") is believed to be the afterg... | grb 210706a: swift-xrt afterglow detection |
at 01:37:03 ut, the swift burst alert telescope (bat) triggered and located grb 210112a (trigger=1016881). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 218.999, +33.070 which is ra(j2000) = 14h 36m 00s dec(j2000) = +33d 04' 13" with an uncertainty of 3 arcmin (radius, 90% conta... | grb 210112a: swift detection of a burst with an optical counterpart |
gw170817 was detected almost 4.5 years ago as the first binary neutron star (bns) merger by the ligo/virgo collaboration. it is the first object to have both a gravitational wave and an electromagnetic counterpart and it also provided the first observational confirmation of the connection between short gamma-ray bursts... | emergence of a new x-ray emission component from gw170817 3.5 years after the merger |
at 08:43:18 ut, the swift burst alert telescope (bat) triggered and located grb 210211a (trigger=1032024). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 269.433, -46.299 which is ra(j2000) = 17h 57m 44s dec(j2000) = -46d 17' 57" with an uncertainty of 3 arcmin (radius, 90% conta... | grb 210211a: swift detection of a burst |
swift-xrt has performed follow-up observations of the fermi/lat-detected burst grb 210802a (longo et al. gcn circ. 30589) in a series of observations tiled on the sky. the total exposure time is 5.2 ks, distributed over 4 tiles; the maximum exposure at a single sky location was 2.3 ks. the data were collected between t... | grb 210802a: swift-xrt afterglow detection |
at 00:10:13 ut, the swift burst alert telescope (bat) triggered and located a burst form the soft gamma repeater sgr 1830-0645 (trigger=1032350). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 277.660, -6.748 which is ra(j2000) = 18h 30m 38s dec(j2000) = -06d 44' 52" with an unce... | swift trigger 1032350: detection of sgr 1830-0645 |
we report the discovery of the fast optical transient ztf21aahifke/at2021clk with the zwicky transient facility (ztf, bellm et al. 2019, graham et al. 2019) at coordinates (j2000, <0.5''): ra = 02:54:27.54 (43.61475d) dec = +36:31:56.80 (+36.53244d) ztf21aahifke was first detected on 2021-02-06 03:14 ut, hereafter l... | ztf21aahifke/at2021clk: ztf discovery of an optical fast transient (possible afterglow) |
at 03:54:31 ut, the swift burst alert telescope (bat) triggered and located grb 210318a (trigger=1037339). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 33.930, -37.789 which is ra(j2000) = 02h 15m 43s dec(j2000) = -37d 47' 21" with an uncertainty of 3 arcmin (radius, 90% contai... | grb 210318a: swift detection of a burst |
at 15:05:51 ut, the swift burst alert telescope (bat) triggered and located grb 210411c (trigger=1042398). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 296.559, -39.373 which is ra(j2000) = 19h 46m 14s dec(j2000) = -39d 22' 21" with an uncertainty of 3 arcmin (radius, 90% conta... | grb 210411c: swift detection of a burst with an optical counterpart |
swift-xrt has performed follow up observations of grb 210218a (sbarufatti et al. gcn circ. 29529). the swift-bat trigger happened while the burst position in the sky was moon constrained for xrt and uvot observations. a first follow up observation was performed when the target emerged from moon constraint, with one unc... | grb 210218a: swift-xrt confirmation of afterglow |
the radio observations of grbs presented in this paper were obtained using ami, which is a radio interferometer consisting of eight 12.8m diameter dishes with baselines between 18 and 110m. as all the observations were conducted prior to 2015 june, the effective frequency range was 13.9-17.5ghz using channels 3-7, each... | vizier online data catalog: ami 15.7ghz grb catalogue (anderson+, 2018) |
gamma-ray bursts (grbs) are panchromatic phenomena by nature; their afterglow emissions are observed from sub-tev energies to radio wavelengths. in this work, we investigate grbs presenting the plateau feature in optical observations, inspired by the similarities with the plateau feature in x-ray observations. we analy... | the 3d optical fundamental plane as a further step of the luminosity-time correlation and future perspective with the kiso observatory |
at 01:53:02 ut on 2018 march 25, the neil gehrels swift observatory detected grb 180325a with its burst alert telescope (bat), and its x-ray telescope (xrt) began observations at 01:54:16.2 ut. at 6 minutes after the burst trigger, the nordic optical telescope (not) equipped with the andalucia faint object spectrograph... | vizier online data catalog: grond, not & vlt/x-shooter obs. of grb180325a (zafar+, 2018) |
swift-xrt has performed follow-up observations of the swift/bat-guano-detected burst grb 210827a (james delaunay et al. gcn circ. 30732), collecting 2.3 ks of photon counting (pc) mode data between t0+44.4 ks and t0+50.4 ks. one uncatalogued x-ray source has been detected consistent with being within 296 arcsec of the ... | grb 210827a: swift-xrt observations |
at 07:20:08 ut, the swift burst alert telescope (bat) triggered and located grb 200227a (trigger=958592). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 56.436, +9.491 which is ra(j2000) = 03h 45m 45s dec(j2000) = +09d 29' 27" with an uncertainty of 3 arcmin (radius, 90% containm... | grb 200227a: swift detection of a burst |
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 ene... | modeling the multi-band afterglow of grb 060908 with the double power-law hard electron energy spectrum model |
at 05:10:20 ut, the swift burst alert telescope (bat) triggered and located grb 211025a (trigger=1081113). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 162.377, +31.557 which is ra(j2000) = 10h 49m 30s dec(j2000) = +31d 33' 26" with an uncertainty of 3 arcmin (radius, 90% conta... | grb 211025a: swift detection of a burst |
grb 130427a was the brightest gamma-ray burst detected in 30 years. with an isotropic energy output of 8.5×10^{53} erg and redshift of 0.34, it combined a very high energy release with a relative proximity to earth in an unprecedented fashion. sensitive x-ray observatories such as xmm-newton and chandra have detected t... | a strong test for the forward shock model in grbs: the 90 ms follow up of the x-ray afterglow of grb 130427a. |
at 05:05:59 ut, the swift burst alert telescope (bat) triggered and located grb 231129a (trigger=1199764). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 317.536, +41.544 which is ra(j2000) = 21h 10m 09s dec(j2000) = +41d 32' 37" with an uncertainty of 3 arcmin (radius, 90% conta... | grb 231129a: swift detection of a burst |
the provenance of swift lies with earlier discoveries of gamma ray burst (grb) phenomena, starting with the serendipitous discovery of grbs by the vela nuclear-test-ban-treaty monitoring satellites, through the first all sky grb mapping by the compton gamma-ray observatory (cgro) to the discovery of x-ray afterglows by... | reflections on swift from the early years |
long-duration gamma-ray bursts (lgrbs) provide a unique way of selecting a sample of actively star-forming galaxies independent of their brightness and at practically any redshift. i will review what we know about the hosts and more immediate environments of lgrbs from two different perspectives: ultraviolet absorption... | lgrb hosts in emission and in absorption |
at 03:47:02 ut, the swift burst alert telescope (bat) triggered and located grb 210725a (trigger=1061511). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 215.363, -1.177 which is ra(j2000) = 14h 21m 27s dec(j2000) = -01d 10' 36" with an uncertainty of 3 arcmin (radius, 90% contai... | grb 210725a: swift detection of a burst |
at 01:02:08 ut, the swift burst alert telescope (bat) triggered and located grb 210818a (trigger=1069169). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 149.131, -87.031 which is ra(j2000) = 09h 56m 32s dec(j2000) = -87d 01' 52" with an uncertainty of 3 arcmin (radius, 90% conta... | grb 210818a: swift detection of a burst with an optical counterpart |
at 14:46:10 ut, the swift burst alert telescope (bat) triggered and located grb 210723a (trigger=1061284). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 121.726, -32.889 which is ra(j2000) = 08h 06m 54s dec(j2000) = -32d 53' 20" with an uncertainty of 3 arcmin (radius, 90% conta... | grb 210723a: swift detection of a burst |
gamma-ray burst (grb) is the most violent explosion in the universe. it has strong gamma-ray emission during short timescale. for some grbs after prompt emission, x-ray flare is shown in the x-ray decay phase. the pulse of x-ray flare, similar to that of grb, has an asymmetric structure. usually the rise time of x-ray ... | an investigation of research progress for x-ray flare in gamma-ray burst |
gamma-ray bursts (grbs), which have been observed up to redshifts z ≈ 9.5 can be good probes of the early universe and have the potential of testing cosmological models. the analysis by dainotti of grb swift afterglow lightcurves with known redshifts and definite x-ray plateau shows an anti-correlation between the <... | determination of intrinsic slope of the luminosity-time correlation in x-ray afterglows of grbs and its implications |
we here present the h.e.s.s. follow-up of fast radio bursts (frbs), millisecond-long, very strong radio pulses of yet unknown origin. the superb (survey for pulsars and extragalactic radio bursts) project at the parkes radio observatory is able to detect these enigmatic events almost in real-time which allows triggerin... | limits on the tev gamma-ray afterglow of fast radio bursts with h.e.s.s. |
at 13:00:27 ut, the swift burst alert telescope (bat) triggered and located grb 221024a (trigger=1131029). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 169.718, +33.041 which is ra(j2000) = 11h 18m 52s dec(j2000) = +33d 02' 28" with an uncertainty of 3 arcmin (radius, 90% conta... | grb 221024a: swift detection of a burst |
we observed the field of grb 210704a (ursi et al., gcn 30372; berretta et al., gcn 30375; malacaria et al. gcn 30380) with the near-infrared imager (niri) mounted on the 8.1m gemini north telescope. we obtained 24x60 s imaging in j-band starting on 2021 july 10 at 06:00 ut (~5.5 days after the grb) at an average airmas... | grb210704a: gemini near-infrared upper limits |
swift-xrt has performed follow-up observations of the second optical afterglow candidate observed by meerlicht (de wet et al. gcn circ. 32460) of the fermi/gbm detected burst grb 220810a (fermi gbm team, gcn 32455), collecting 4.9 ks of photon counting (pc) mode data between t0+156.3 ks and t0+180.2 ks. no x-ray source... | grb 220810a: swift-xrt observations |
at 16:09:14 ut, the swift burst alert telescope (bat) triggered and located grb 220706a (trigger=1114937). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 0.587, -16.391 which is ra(j2000) = 00h 02m 21s dec(j2000) = -16d 23' 28" with an uncertainty of 3 arcmin (radius, 90% contain... | grb 220706a: swift detection of a burst |
grb 170817a, the first short gamma-ray burst (sgrb) to be detected after the gravitational wave signal from a binary neutron star (bns) merger, proved that such merger events are able to power relativistic jets and provided unprecedented insights into the associated electromagnetic (em) emission at all wavelengths. the... | short gamma-ray burst jet propagation through self-consistent post-merger environments |
the afterglow emission of gamma-ray bursts (grbs) often shows a nearly constant flux evolution ("plateau") lasting ~ hours after the prompt emission. plateaus are typically observed in x-rays but in a fraction of events they are also observed in the optical bands. the origin of the plateau is still unknown and several ... | on the origin of afterglow "plateaus" in gamma-ray bursts |
swift-xrt has performed further follow-up observations of the swift/bat-guano-detected burst grb 210827a (james delaunay et al. gcn circ. 30732), collecting a total of 12.2 ks of photon counting (pc) mode data between t0+44.4 ks and t0+257.2 ks. the uncatalogued candidate x-ray source (source 3) reported in gropp et al... | grb 210827a: further swift-xrt observations |
we report the discovery of the fast and red optical transient ztf22aaajecp/at2022cmc with the zwicky transient facility (ztf, bellm et al. 2019, graham et al. 2019) at coordinates: ra = 13:34:43.20 (203.6800149d) dec = +33:13:00.44 (33.2167887d) ztf22aaajecp was first detected on 2022-02-11 10:42 ut at r=20.73 +- 0.3 m... | ztf22aaajecp/at2022cmc: zwicky transient facility discovery of a fast and red optical transient |
recently, ground-based imaging atmospheric cherenkov telescopes, such as magic and h.e.s.s., have reported the detection of very-high-energy (vhe) gamma-rays from four gamma-ray bursts (grb 180720b, 190114c, 190829a, 201216c). one of them, grb 190829a, was triggered by the swift satellite, and about 20000 s after the b... | on theoretical interpretation of broad-band afterglows of a very-high-energy grb 190829a |
at 10:31:52 ut, the swift burst alert telescope (bat) triggered and located grb 230427a (trigger=1165948). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 153.324, +48.180 which is ra(j2000) = 10h 13m 18s dec(j2000) = +48d 10' 48" with an uncertainty of 3 arcmin (radius, 90% conta... | grb 230427a: swift detection of a burst with an optical counterpart |
in this thesis, we present three projects on open questions in the gammaray burst (grb) field. in the first project, we used x-ray and optical observations to determine the amount of amplification of the ism magnetic field needed to explain the grb afterglow observations. we determined that mild amplification is requir... | towards understanding magnetic field generation in relativistic shocks with grb afterglow observations and the grb radiation mechanism with photospheric simulations and the x-ray flare radiation mechanism |
the follow-up of $\gamma$-ray bursts (grbs) by the x-ray telescope (xrt, 0.3-10 kev) on board the neil gehrels swift observatory led to the discovery of a shallow decay phase (the so-called plateau) of the x-ray emission in a good fraction of grbs. this unexpected temporal behaviour does not fit the standard grb afterg... | x-ray plateaus in \\gamma-ray bursts explained by structured jets |
the prompt emission of the long, smooth, and single-pulsed gamma-ray burst, grb 141028a, is analyzed under the guise of an external shock model. first, we fit the γ-ray spectrum with a two-component photon model, namely synchrotron+blackbody, and then fit the recovered evolution of the synchrotron ν f_{ν} peak to an an... | an external shock origin of grb 141028a |
dark gamma-ray bursts (grbs) -- where the optical emission is apparently suppressed -- can only be reliably localized by their x-ray afterglows. here we propose to continue a survey using the sensitivity and point spread function of chandra to precisely pinpoint the grb locations, and hst to locate and study the host g... | a chandra/hst survey of dark gamma-ray bursts |
the electromagnetic counterpart of the binary neutron-star merger gw 170817, connected with the short grb 170817a, has been monitored from early to very late times at all wavelengths. multi-band observations demonstrated the existence of the kilonova emission associated with the merger of a binary neutron-star system, ... | the evolution of the x-ray and radio emission of gw 170817/grb 170817a |
at 13:58:04 ut, the swift burst alert telescope (bat) triggered and located grb 220714b (trigger=1116221). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 47.072, -19.334 which is ra(j2000) = 03h 08m 17s dec(j2000) = -19d 20' 02" with an uncertainty of 3 arcmin (radius, 90% contai... | grb 220714b: swift detection of a burst |
following the remarkable neutron star binary merger known as gw170817, much research has been conducted to uncover its nature and investigate whether its nearby location presents an opportunity to unveil similar events. gw170817 was accompanied by a kilonova, plus a delayed radio afterglow related to an off-axis jet th... | a search for gw170817-like nearby grbs in the swift/bat sample |
swift-xrt has performed follow-up observations of the fermi/lat-detected burst grb 220527a (bissaldi et al. gcn circ. 32131), collecting 1.7 ks of photon counting (pc) mode data between t0+30.1 ks and t0+31.9 ks. two uncatalogued x-ray sources are detected, of which one ("source 2") is above the rass 3-sigma upper limi... | grb 220527a: swift-xrt afterglow detection |
on august 17, 2017, ligo/virgo detected the first gravitational waves from merging neutron stars. this event, known as gw170817 was accompanied by observations all over the electromagnetic spectrum. the peculiar gamma-ray burst that followed the merger in gw170817, is unlike any gamma-ray burst observed before. in orde... | binary neutron star mergers: the fate of the merger remnant in gw170817 and its imprint on the jet structure |
gamma ray bursts (grbs) can be used as a powerful tool to study galactic environments at different epochs of the universe’s evolution, thanks to their bright afterglow emission ranging from x-rays to optical and radio wavebands. important aspect of the environment is dust, which plays a central role in the astrophysica... | extinction curves of grb environment with the x-shooter spectrograph |
current time-domain wide-field sky surveys generally operate with few-degree-sized fields and take many individual images to cover large sky areas each night. we present the design and project status of the evryscope ("wide-seer"), which takes a different approach: using an array of small telescopes to form a single wi... | the evryscope: the first full-sky gigapixel-scale telescope |
gamma-ray burst (grb) afterglows shine, during a brief period of time as the most luminous objects that can be detected in the universe. they have been observed at almost any redshift, from our nearby environment (the nearest one, at z = 0.08) to the very distant universe (the current record holder at z = 9.4). their o... | statistical study of the ism of grb hosts |
in the gamma ray burst afterglow model, a relativistic shell forms which is unstable to the rayleigh-taylor instability during the formation of a relativistic blastwave. this instability is likely observable, and understanding the resulting turbulence have motivated many previous studies into the rayleigh-taylor instab... | examing the rayleigh-taylor instability in grb outflow using wavelets |
we discuss the lack of a clear jet-break in the optical and x-ray afterglow light curve of grb 130427a, which suggests that a very large isotropic energy is emitted in this burst. | to beam or not to beam. . . |
while the dominant radiation mechanism gamma-ray bursts (grbs) remains a question of debate, synchrotron emission is one of the foremost candidates to describe the multi-wavelength afterglow observations. as such, it is expected that grbs should present some degree of polarization across their evolution - presenting a ... | polarization from a radially stratified off-axis grb outflow |
the simultaneous detection of gravitational waves by the ligo and virgo detectors from a binary neutron star (bns) merge, gw 170817, is the first gravitational wave event that has electromagnetic (em) follow-up observations, from gamma-rays to millimeter wavelengths. the data from these em counterparts lead to the idea... | synthetic spectra for an off-axis afterglow from a short gamma-ray burst |
here, we present the grb 141220a optical photometry corresponding to the liverpool telescope (lt) ringo3 bv,r,i bands, skycam-z r-equivalent band, and io:o r band. a bright optical afterglow of 14.84+/-0.17 mag was detected 86s after bat trigger at the grb 141220a location by the 0.2-m skycam-z telescope, attached to t... | vizier online data catalog: grb 141220a light curves (jordana-mitjans+, 2021) |
at 10:29:51 ut, the swift burst alert telescope (bat) triggered and located grb 230205a (trigger=1152764). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 202.072d, +46.684d which is ra(j2000) = 13h 28m 17s dec(j2000) = +46d 41' 01" with an uncertainty of 3 arcmin (radius, 90% con... | grb 230205a: swift detection of a burst |
swift-xrt has performed follow-up observations of the ipn-detected burst grb 230906a (kozyrev et al., gcn circ 34637), collecting 4.7 ks of photon counting (pc) mode data between t0+93.0 ks and t0+106.0 ks. one uncatalogued x-ray source has been detected, it is below the rass limit and shows no definitive signs of fadi... | grb 230906a: swift-xrt observations |
we observed the field of ztf23aaoohpy/at2023lcr (swain et al., gcn 34022, gompertz et al., gcn34023, kumar et al., gcn34025)using the t193cm and t120cm telescopes at observatoire de haute-provence (france) respectively equipped with the mistral spectro-imager and the t120 ccd camera. a total of 8 exposures were obtaine... | ztf23aaoohpy/at2023lcr: ohp/t193 and ohp/t120 optical follow-up observations |
swift-xrt has performed follow-up observations of the swift/bat-guano-detected burst grb 221231a, collecting 5.0 ks of photon counting (pc) mode data between t0+32.4 ks and t0+44.3 ks. five uncatalogued x-ray sources have been detected, however none of them is above the rass limit or shows definitive signs of fading. t... | grb 221231a: swift-xrt observations |
the origin of prompt emission in $\gamma$-ray bursts (grbs) is highly debated topic. the observed spectra are supposed to play a crucial role in constraining the location of the emitting region, the strength of the magnetic field and the distribution of the accelerated particles. the apparent inconsistency of the promp... | early optical emission in support of synchrotron radiation in \\gamma-ray bursts |
at 13:35:08 ut, the swift burst alert telescope (bat) triggered and located grb 170526a (trigger=754549). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 4.708, +1.240 which is ra(j2000) = 00h 18m 50s dec(j2000) = +01d 14' 22" with an uncertainty of 3 arcmin (radius, 90% containme... | grb 170526a: swift detection of a burst |
afterglows of gamma-ray bursts often show flares, plateaus, and sudden intensity drops: these temporal features are difficult to explain as coming from the forward shock. we calculate radiative properties of early grb afterglows with the dominant contribution from the reverse shock (rs) propagating in an ultra-relativi... | wind-powered afterglows of gamma-ray bursts: flares, plateaus and steep decays |
swift has performed further observations of the field of the fermi/lat-detected burst grb 170522a (arimoto et al., gcn circ. 21127). an additional 3.5 ks of data were collected between 987 ks and 999 ks after the fermi trigger. source 1, initially reported by mingo et al. (gcn circ. 21133), is no longer detected to a 3... | grb 170522a: confirmation of the x-ray afterglow |
international scientific optical network (ison) is one of largest observing networks specializing in space objects. the main goals of ison are the investigation of space debris, studying near earth asteroids (nea) and observing gamma-ray-bursts (grb) afterglows. ison is continuously growing and currently has 35 observa... | international scientific optical network (ison) in latin america |
the swift-uvot and xrt began settled observations of the field of grb 170524b 120 ks after the bat trigger (barthelmy et al., gcn circ. 21142). a fading source consistent with the xrt position is detected in the uvot exposures. swift-xrt performed follow-up observations of the swift/bat-detected burst grb 170524b (bart... | grb 170524b: swift-uvot/xrt confirmation of afterglow |
we present a method to estimate the jet opening angles of long duration gamma-ray bursts (grbs) using the prompt gamma-ray energetics and an inversion of the ghirlanda relation, which is a correlation between the time-integrated peak energy of the grb prompt spectrum and the collimation-corrected energy in gamma-rays. ... | vizier online data catalog: jet angles and gamma-ray energetics estimations (goldstein+, 2016) |
with the discovery of the electromagnetic counterpart of the gravitational wave source gw170817 the multi-messenger era is started. the identification of an electromagnetic counterpart is crucial to understand the nature of the detected gravitational wave sources and to maximize the scientific return of their detection... | infrared emission from gravitational wave sources with theseus/irt. |
the hosts of long gamma-ray bursts (grbs) are places of intense star-formation, which, at low redshift, are primarily low-mass dwarf starburst galaxies. spatially resolved studies of these galaxies are still sparse, even more so at high spectral resolution where we can probe gas kinematics, in- and outflows and differe... | dwarf galaxies as hosts of stellar explosions: gas kinematics and abundances in 3d |
the laser interferometer gravitational-wave observatory (ligo) and virgo observatory detect gravitational wave (gw) emission from neutron star mergers. when ligo/virgo detect a neutron star merger, fully characterizing the event is challenging due to fairly poor localizations of ~10-100's of square degrees, and relies ... | on to off: predictions for the radio afterglows of neutron star mergers |
while much has been learned about the particle acceleration and emission processes at work during both the prompt and afterglow phases of gamma-ray bursts (grbs), important questions remain, some of which can be addressed by searches for the highest-energy photons from grbs using telescopes operating in the very high e... | the veritas gamma ray burst follow-up program |
"we observed grb 191221b (laha et al., gcn 26534) with the australia telescope compact array (atca) at multiple frequencies and multiple epochs beginning on 2019 december 22 14:17 ut (0.73 days after the burst). we detect a varying radio counterpart at 5.5, 9.0, 16.7, and 21.2 ghz at a position consistent with the x-ra... | grb 191221b: atca detection of the radio afterglow |
gamma ray bursts (grbs) can be used to address high priority scientific questions on the formation of the universe including: when did the star formation begin and how did it evolve? when and how did the intergalactic medium become re-ionized and what processes governed its early chemical enrichment? long grbs signal w... | the gamow explorer: a gamma-ray burst mission to investigate the high redshift universe |
long gamma-ray bursts (grbs) with a plateau phase in their x-ray afterglows obey a 3d relation, between the rest-frame time at the end of the plateau, t a , its corresponding x-ray luminosity, l a , and the peak luminosity in the prompt emission, l peak. this 3d relation identifies a grb fundamental plane whose existen... | the fundamental plane for grb x-ray afterglows |
the transiting exoplanet survey satellite (tess) has proven to be an invaluable tool to detect extrasolar planets. however, the full-sky survey conducted by tess also lends itself to a different type of analysis - the detection of astrophysical periodic and transient events, such as variable stars, supernovae, and gamm... | using tess data to detect astrophysical transients |
at 09:07:37 ut on 14 may 2020, the fermi gamma-ray burst monitor (gbm) triggered and located grb 200514b (gcn 27736, fermi-gbm team). follow-up observations by the zwicky transient facility identified ztf20aazpphd as a potential optical counterpart to grb 200514b (ahumada et al., gcn 27737). ztf20aazpphd was subsequent... | optical transient ztf20aazpphd is unrelated to grb 200514b |
the uvot is a modified richey-chretien 30 cm telescope that has a wide (17'x17') field of view and a microchannel plate intensified ccd operating in photon-counting mode (see details in roming et al. 2000spie.4140...76r, 2004spie.5165..262r, 2005ssrv..120...95r) on board the neil gehrels swift gamma ray burst mission (... | vizier online data catalog: swift uvot stars survey. iii. galactic open clusters (siegel+, 2019) |
burst observed from grb 190114c on 14 january 2019. report of a paper in apj by nuria jordan et al. | news note: master observes gamma-ray burst afterglow |
i will present a summary of the extensive multi wavelength observations of the counterpart of gw170817 and its host galaxy. i will highlight how these observations unveiled the associated kilonova, and what the properties of the kilonova tell us about the geometry of the explosion and the synthesis of heavy elements. i... | optical/x-ray observations of gw170817 and its environment |
at 23:04:55.34 ut on 20 january 2020, the fermi gamma-ray burst monitor (gbm) triggered and located grb 200120a (trigger 601254300 / 200120962). grb 200120a was also detected by insight/hmxt (gcn 26840) and astrosat/czti (gcn 26851), and localized by the ipn (gcn 26856). approximately 820 s after the gbm trigger, srg/e... | grb 200120a: fermi gbm observation |
despite a general framework for describing gamma-ray burst (grb) afterglows, the nature of the compact object and the mechanism behind the grb prompt emission remain a mystery. the striped jet model is a promising venue to investigate many of these pressing questions since it gives a robust prediction of the relation o... | connecting the early afterglow to the prompt grb and the central engine |
grb 220412b is an extremely short duration gamma-ray burst lasting just 140ms. prompt x-ray and optical follow-up revealed no corresponding afteglow to deep limits at early times. however, our vla observations at 10 days after trigger reveal a bright (~380 ujy) uncataloged radio source offset just a few arcseconds from... | confirmation of a candidate nearby off-axis short grb |
when two compact objects neutron stars or black holes merge, will they emit light? a recent study looks at a neglected factor that could affect the answer: electric charge.dark or light?artists impression of two merging neutron stars producing a gamma-ray burst. [national science foundation/ligo/sonoma state university... | compact objects charging toward merger |
we propose a chandra too program to observe short grbs detected by swift in order to localize their x-ray afterglow with sub-arcsecond accuracy. our too program will increase the number of short grbs having an unambiguous host galaxy identification, and provide a less biased sample of grb host galaxies. we request a ma... | chandra sub-arcsecond localization of swift short grbs |
at 15:03:28 ut, the swift burst alert telescope (bat) triggered and located a burst from soft gamma repeater sgr swift j1818.0-1607 (trigger=972614). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 274.550, -16.193 which is ra(j2000) = 18h 18m 12s dec(j2000) = -16d 11' 32" with an... | swift detection of a burst from sgr swift j1818.0-1607 |
spectroscopic study of prompt gamma ray emission of grbs, while providing valuable information, has not proven adequate to fully discriminate between various emission models. measurement of polarisation simultaneously with spectroscopy, however, adds a very important dimension that allows one to put strong constraints ... | time resolved spectro-polarimetry of grb prompt emission |
at 09:51:06 ut, the swift burst alert telescope (bat) triggered and located grb 211129a (trigger=1085430). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 274.557, +31.776 which is ra(j2000) = 18h 18m 14s dec(j2000) = +31d 46' 33" with an uncertainty of 3 arcmin (radius, 90% conta... | grb 211129a: swift detection of a burst |
at 20:05:28 ut, the swift burst alert telescope (bat) triggered and located grb 220117b (trigger=1093611). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 191.947, -28.744 which is ra(j2000) = 12h 47m 47s dec(j2000) = -28d 44' 38" with an uncertainty of 3 arcmin (radius, 90% conta... | grb 220117b: swift detection of a burst |
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