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following the discovery of the remarkable binary neutron star merger gw170817 by the ligo and virgo collaborations, much research has been conducted to uncover the nature of its post-merger remnant. gw170817 was accompanied by a gamma-ray burst (grb), an optical kilonova, and a radio-to-x-ray-emitting structured jet. s... | a search for kilonova radio flares in a sample of swift/bat short grbs |
at 00:12:41 ut, the swift burst alert telescope (bat) triggered and located grb 210905a (trigger=1071993). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 309.062, -44.431 which is ra(j2000) = 20h 36m 15s dec(j2000) = -44d 25' 50" with an uncertainty of 3 arcmin (radius, 90% conta... | grb 210905a: swift detection of a burst |
swift-xrt has performed follow-up observations of the swift/bat-guano-detected burst grb 231017a (gcn circ. 34824, delaunay et al.), collecting 4.2 ks of photon counting (pc) mode data between t0+32.7 ks and t0+101.7 ks. one uncatalogued x-ray source has been detected consistent with being within 493 arcsec of the swif... | grb 231017a: swift-xrt observations |
it is widely known that the x-ray afterglows from long-duration gamma ray bursts (grbs) are often associated with energetic type ic supernovae and that they approximately obey a universal scaling law. here, we discuss a model for x-ray emission from accelerated relativistic electrons within an outgoing relativistic sho... | constraints on the source for gamma-ray bursts from observed x-ray afterglows |
gamma-ray bursts (grbs) are the most energetic electromagnetic transients in universe, spewing out intense bursts of photons from kev to tev energies with a duration of a few milliseconds up to days. depending on the duration, grbs are classified into two types: short grbs (sgrbs) and long grbs (lgrbs) with a duration ... | joint study of fermi/lat and swift/xrt detected gamma-ray bursts with extended afterglow emission |
swift-xrt has performed follow-up observations of the swift/bat-detected burst grb 170524b (barthelmy et al. gcn circ. 21142), collecting 2.1 ks of photon counting (pc) mode data between t0+119.5 ks and t0+126.8 ks. one uncatalogued x-ray source has been detected consistent with being within 296 arcsec of the swift/bat... | grb 170524b: swift-xrt observations |
recent space- and ground-based studies of the circumgalactic medium around galaxies have revealed the dynamic interplay between the galaxy ecosystem and surrounding cgm using bright background quasars. here, we extend this investigation of the cgm to higher redshifts by using the bright afterglows of gamma-ray bursts a... | cgm-grb: a survey of the circumgalactic medium around grb hosts |
fast radio bursts (frbs) are brief radio transients originating from ~gpcdistances. most models for frbs, including the leading magnetar modelsexpect high-energy (0.1-100 kev) counterparts and afterglows to frbs. therecent detection of a galactic frb with a hard x-ray burst from magnetarsgr 1935+2154 lends support to t... | search for the x-ray afterglows from the nearest fast radio bursts |
gamma-ray bursts (grbs) are energetic transients originating in a violent explosion of a massive star or merger of two compact objects in a binary system. these explosions create a relativistic blastwave which inevitably collides with the circumburst medium and results in external shocks. the emission produced thereby ... | synchrotron and synchrotron self-compton emission components in grbs detected at very high energies |
in this study, we will introduce some special events, such as grbs 081029, 100814a and 111209a. unexpected features, such as multiple x-ray flares and significant optical rebrightenings, are observed in their afterglow light curves, unveiling the late-time activities of the central engines. here, we will summarize our ... | energy injections in gamma ray bursts |
gamma-ray bursts (grbs) are promising tools to probe the universe. especially, we can get constraints on cosmological parameters with the help of grb luminosity relations. recently, a tight l-t-e relation has been found. this relation involves a special subclass of grbs, i.e., grbs have x-ray plateaus in their x-ray af... | probe the universe by using gamma-ray bursts with x-ray plateaus |
swift-xrt has performed follow-up observations of the swift/bat-guano-detected burst grb 221206b, collecting 4.8 ks of photon counting (pc) mode data between t0+28.7 ks and t0+45.0 ks. no x-ray sources have been detected within the swift/bat-guano error circle. the 3-sigma upper limit in the field ranges from ~0.002 to... | grb 221206b: swift-xrt observations |
gamma-ray bursts (grbs) are the most luminous objects known: they outshine their host galaxies making them ideal candidates for probing large-scale structure. earlier, the angular distribution of different grbs (long, intermediate and short) has been studied in detail with different methods and it has been found that t... | anomalies in the grbs' distribution |
at 12:40:50 ut, the swift burst alert telescope (bat) triggered and located grb 190706b (trigger=913302). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 107.449, -29.584, which is ra(j2000) = 07h 09m 48s dec(j2000) = -29d 35' 02" with an uncertainty of 3 arcmin (radius, 90% conta... | grb 190706b: swift detection of a burst |
at 16:08:48 ut, the swift burst alert telescope (bat) triggered and located grb 230816a (trigger=1185673). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 328.375, +37.828 which is ra(j2000) = 21h 53m 30s dec(j2000) = +37d 49' 43" with an uncertainty of 3 arcmin (radius, 90% conta... | grb 230816a: swift detection of a burst |
gamma-ray bursts (grbs) are believed collimated, we using a large optical afterglow sample f to investigate the jet break phenomenons in grbs. we also use the jet break candidates to test the typical experimental luminosity correlations. | gamma-ray burst jets revisited |
swift has performed follow-up observations of the fermi/gbm-detected burst grb 220426a (gcn circ. 31950, 31955), which was also detected by swift/bat-guano (gcn circ. 31954), konus-wind (gcn circ. 31959), integral/spi-acs, and hend/mars-odyssey (gcn circ. 31958). the xrt observations consist of three tiles of 1 ks each... | grb 220426a: swift-xrt and uvot observations |
the microchannel x-ray telescope (mxt) for the space-based multi-band astronomical variable objects monitor (svom), a franco-chinese mission (cnes/cnsa), is designed for the soft x-ray range (0.2-10 kev) to observe gamma-ray bursts (grbs) from the beginning to the afterglow emission. in the past years, the panter test ... | svom-mxt optic and telescope testing at panter |
the em counterpart of gw170817 was remarkably different from model predictions. the gamma-rays were a factor of ~10^3 weaker than for regular short gamma-ray bursts (sgrbs), there was an early blue kilonova, and late radio/x-ray emission. a relativistic jet was launched and interacted with the merger ejecta, driving a ... | chasing the x-ray afterglows of gravitational-wave events |
the detection of gamma-ray bursts (grbs) is one of the main scientific targets pursued by the magic collaboration since almost 20 years. the magic telescopes were specifically designed for this purpose: the main figures of merit are the fast slewing speed (7deg/s), the low energy threshold ( 50 gev at zenith) and the h... | magic view of gamma-ray bursts at very high energies |
we suggest that the collision of a small solid body with a pulsar can lead to an observable glitch/anti-glitch. the glitch amplitude depends on the mass of the small body and the impact parameter as well. in the collision, a considerable amount of potential energy will be released either in the form of a short hard x-r... | collision-induced glitch/anti-glitches |
recently, jin et al. reanalyzed the optical observation data of grb 050709 and reported a line-like spectral energy distribution (sed) component observed by the very large telescope at t ∼ 2.5 days after the trigger of the burst, which had been interpreted as a broadened line signal arising from a macronova dominated b... | is the line-like optical afterglow sed of grb 050709 due to a flare? |
"we initiated observations with the chandra x-ray observatory of the short-duration grb 210726a (bernardini et al., gcn 30523; tohuvavohu, gcn 30535; palmer, gcn 30536) starting on 2021 july 29 16:04:38 ut, with a median observation time of ~3 days post-trigger. we obtained one acis-s observation under the proposal 224... | grb 210726a: chandra detection of the x-ray afterglow |
at 22:21:08 ut, the swift burst alert telescope (bat) triggered and located grb 210731a (trigger=1062336). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 300.314, -28.042 which is ra(j2000) = 20h 01m 15s dec(j2000) = -28d 02' 30" with an uncertainty of 3 arcmin (radius, 90% conta... | grb 210731a: swift detection of a burst |
x-ray afterglows from long-duration gamma ray bursts (grbs) are associated with energetic type ic supernovae and the late time behavior of the afterglow from all grbs follows the same universal normalization and power-law behavior at late times (~104 - 107 sec) when plotted relative to the time of the initial grb trigg... | constraints on the source for gamma-ray bursts from observed x-ray afterglows |
at 08:34:58 ut, the swift burst alert telescope (bat) triggered and located grb 180620a (trigger=843122). swift slewed to the burst with a 3 min delay. the bat on-board calculated location is ra, dec 279.883, +23.265, which is ra(j2000) = 18h 39m 32s dec(j2000) = +23d 15' 55" with an uncertainty of 3 arcmin (radius, 90... | grb 180620a: swift detection of a burst with an optical counterpart |
swift-xrt has performed follow-up observations of the fermi/gbm-detected burst grb 230307a (dalessi et al. gcn circ. 33407) in a series of observations tiled on the sky. the total exposure time is 8.6 ks, distributed over 32 tiles; the maximum exposure at a single sky location was 1.6 ks. the data were collected betwee... | grb 230307a: swift-xrt observations |
thunderstorms emit energetic radiation of different types, physically distinguishable based on duration. on the one hand, terrestrial gamma-ray flashes (tgfs) are microsecond-long bursts of photons, and on the other hand, gamma-ray glows last much longer, for seconds to minutes or even hours. whereas tgfs are the resul... | tgf afterglows: a new radiation mechanism from thunderstorms |
when a pair of neutron stars collide, they emit a fireworks show. could some of the low-energy light produced in these mergers be detectable years later? a team of scientists thinks so and theyre pretty sure theyve found an example.a rainbow of signalsin addition to gravitational waves, a slew of electromagnetic radiat... | a radio flare from colliding stars? |
the multi-messenger discovery of the neutron star merger gw170817 showed that nearby mergers may be common. however, this merger probably would have not been identified as nearby without its gravitational wave detection, raising the possibility that other nearby events may be hiding in plain sight. a possibility to unc... | search for nearby neutron star mergers via radio flares |
a local population of faint short gamma-ray bursts (grbs) with late afterglow onset and bright optical kilonova was revealed by the discovery of the first binary neutron star merger gw170817/grb170817a. in our work we investigate whether similar nearby (<200 mpc) events were observed by nasa's neil gehrels swift obs... | search of short grbs within 200 mpc with neil gehrels swift observatory |
long-duration gamma-ray bursts (grbs) are a result of the collapse of massive stars accompanied by relativistic outflows. the initial gamma-ray flash of a grb is accompanied by a long-lasting afterglow visible from x-ray to radio wavelengths. the rate of radio afterglows detection is ∼ 30%. the early evolution of radio... | radio afterglows of long duration gamma ray bursts |
we present the ixpe observation of grb 221009a which includes upper limits on the linear polarization degree of both prompt and afterglow emission in the soft x-ray energy band.grb 221009a is an exceptionally bright gamma-ray burst (grb) that reached earth on 2022 october 9 after traveling through the dust of the milky... | the ixpe view of grb 221009a |
at 23:25:42 ut, the swift burst alert telescope (bat) triggered and located grb 210217a (trigger=1033264). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 97.610, +68.715 which is ra(j2000) = 06h 30m 26s dec(j2000) = +68d 42' 53" with an uncertainty of 3 arcmin (radius, 90% contai... | grb 210217a: swift detection of a burst with an optical counterpart |
at 23:21:33 ut, the swift burst alert telescope (bat) triggered and located grb 170607a (trigger=756284). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 7.343, +9.238 which is ra(j2000) = 00h 29m 22s dec(j2000) = +09d 14' 16" with an uncertainty of 3 arcmin (radius, 90% containme... | grb 170607a: swift detection of a burst with a bright optical counterpart |
at 16:39:07 ut, the swift burst alert telescope (bat) triggered and located grb 200324a (trigger=963260). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 222.685, +35.968 which is ra(j2000) = 14h 50m 44s dec(j2000) = +35d 58' 06" with an uncertainty of 3 arcmin (radius, 90% contai... | grb 200324a: swift detection of a burst |
swift-xrt has performed follow-up observations of the fermi/lat-detected burst grb 200803a (cutini et al. gcn circ. 28203) in a series of observations tiled on the sky. the total exposure time is 3.5 ks, distributed over 4 tiles; the maximum exposure at a single sky location was 1.6 ks. the data were collected between ... | grb 200803a: swift-xrt afterglow detection |
swift-xrt has performed follow-up observations of the swift/bat-detected burst grb 191016a (weikang zheng et al. gcn circ. 26012), collecting 4.2 ks of photon counting (pc) mode data between t0+45.0 ks and t0+56.9 ks. an uncatalogued x-ray source is detected consistent with being within 296 arcsec of the swift/bat posi... | grb 191016a: swift-xrt afterglow detection |
at 07:05:17 ut, the swift burst alert telescope (bat) triggered and located grb 200416a (trigger=966554). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 335.691, -7.530 which is ra(j2000) = 22h 22m 46s dec(j2000) = -07d 31' 47" with an uncertainty of 3 arcmin (radius, 90% contain... | grb 200416a: swift detection of a burst with an optical afterglow |
in order to investigate the true hosts and determine which matches are spurious, we have observed subsets of the sample with wht/acam, vlt/x-shooter, and atca. 7 targets were observed with acam/wht, 5 with vlt/x-shooter and 14 with atca a population of infrared-bright grb host galaxies has been identified by cross-matc... | vizier online data catalog: ir-bright gamma-ray burst host galaxies (chrimes+, 2018) |
bat has triggered on a new grb 210402a (trigger #1040123) causing swift to slew to the location and make follow-up observations. due to a ground pass at the time of the grb, no precise trigger time, location, or light curve data is immediately available. these details will be given in a later circular. we note that fer... | grb 210402a: swift detection of a burst |
at 03:19:59 ut, the swift burst alert telescope (bat) triggered and located grb 200409a (trigger=965484). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 60.553, -50.247, which is ra(j2000) = 04h 02m 13s dec(j2000) = -50d 14' 49" with an uncertainty of 3 arcmin (radius, 90% contai... | grb 200409a: swift detection of a burst with an optical counterpart |
swift-xrt has performed follow-up observations of the fermi/gbm-detected burst grb 230827b (gcn circ. 34584), collecting 3.6 ks of photon counting (pc) mode data between t0+231.3 ks and t0+249.7 ks. an uncatalogued x-ray source is detected consistent with being within 9.9 arcsec of the position of ztf23abaanxz/at2023qx... | grb 230827b: swift-xrt afterglow detection |
at 19:26:28 ut, the swift burst alert telescope (bat) triggered and located grb 200107b (trigger=948219). swift did not slew immediately due to an observing constraint. the bat on-board calculated location is ra, dec 107.066, -83.716 which is ra(j2000) = 07h 08m 16s dec(j2000) = -83d 42' 56" with an uncertainty of 3 ar... | grb 200107b: swift detection of a burst |
we have analysed 9.4 ks of photon counting (pc) mode xrt data for the swift-bat-detected burst grb 230116c (lien et al. gcn circ. 33193), collected between t0+159.6 ks and t0+537.9 ks. six uncatalogued x-ray sources have been detected consistent with being within 296 arcsec of the swift-bat position, however none of th... | grb 230116c: swift-xrt observations |
the transient ztf20aazpphd (at2020jww) was reported by ahumada et al. (gcn 27737) at r = 19.6 +/- 0.05 within the localization region of the short grb200514b (trigger 611140062) detected by the gamma-ray burst monitor (gbm) on the fermi satellite at mjd = 58983.38029 (gcn 27736). atlas, the twin telescope system on hal... | grb200514b: atlas detections of ztf20aazpphd |
swift-xrt has performed follow-up observations of the fermi/lat-detected burst grb 230512a in a series of observations tiled on the sky. the total exposure time is 4.9 ks, distributed over 4 tiles; the maximum exposure at a single sky location was 2.3 ks. the data were collected between t0+45.5 ks and t0+57.3 ks, and a... | grb 230512a: swift-xrt observations |
we report the discovery of the fast optical transient ztf20abtxwfx/at2020sev with the zwicky transient facility (ztf, bellm et al. 2019, graham et al. 2019) at coordinates: raj2000 = 16:41:21.21 (250.338384d) decj2000 = +57:08:20.5 (+57.139027d) ztf20abtxwfx was found during the science validation of the new "ztf realt... | zwicky transient facility discovery of ztf20abtxwfx/at2020sev, a fast optical transient and candidate afterglow |
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 |
at 01:07:44 ut, the swift burst alert telescope (bat) triggered and located grb 201027a (trigger=1002158). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 155.974, -5.515 which is ra(j2000) = 10h 23m 54s dec(j2000) = -05d 30' 53" with an uncertainty of 3 arcmin (radius, 90% contai... | grb 201027a: swift detection of a burst |
fermi-gbm triggered grb 200412b (gcncs 27547, 27548i, 27558) prompt emissions and high energy observations were also carried out by fermi-lat (gcnc 27557) and other space-based facilities like konus-wind (gcnc 27581), astrosat (gcnc 27563), calet (gcnc 27572) and hxmt (gcnc 27567). categorised as a long-duration grb, s... | gagarin-day grb 200412b: observations with the 3.6m devasthal optical telescope |
swift-xrt has performed follow-up observations of the maxi-detected burst grb 210102b (guo et al. gcn circ. 29223) 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 406 s. the data were collected between t0+19.7 k... | grb 210102b: swift-xrt observations |
swift-xrt has performed follow-up observations of the swift/bat-detected burst grb 201128b (james delaunay et al. gcn circ. 28971), collecting 5.0 ks of photon counting (pc) mode data between t0+246.0 ks and t0+303.8 ks. ten uncatalogued x-ray sources have been detected, however none of them is above the rass limit or ... | grb 201128b: swift-xrt observations |
swift-xrt has performed follow-up observations of the fermi-detected burst grb 200325b (fermi gbm team, gcn cir. 27441), collecting 1.1 ks of photon counting (pc) mode data between t0+102.4 ks and t0+124.8 ks in a single pointing covering the region of the candidate grb optical counterpart initially reported by lipunov... | grb 200325b: swift-xrt and uvot observations |
at 23:06:34 ut, the swift burst alert telescope (bat) triggered and located grb 201221d (trigger=1014037). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 171.049, +42.144 which is ra(j2000) = 11h 24m 12s dec(j2000) = +42d 08' 39" with an uncertainty of 3 arcmin (radius, 90% conta... | grb 201221d: swift detection of a bright short burst |
swift-xrt has performed follow-up observations of the fermi/lat-detected burst grb 201116a (axelsson et al. gcn circ. 28907) in a series of observations tiled on the sky. the total exposure time is 4.8 ks, distributed over 3 tiles; the maximum exposure at a single sky location was 3.1 ks. the data were collected betwee... | grb 201116a: swift-xrt afterglow detection |
at 17:22:56 ut, the swift burst alert telescope (bat) triggered and located grb 230903a (trigger=1189514). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 9.926, -40.924 which is ra(j2000) = 00h 39m 42s dec(j2000) = -40d 55' 25" with an uncertainty of 3 arcmin (radius, 90% contain... | grb 230903a: swift detection of a burst |
at 19:19:03 ut, the swift burst alert telescope (bat) triggered and located grb 210726a (trigger=1061687). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 193.342, +19.185 which is ra(j2000) = 12h 53m 22s dec(j2000) = +19d 11' 05" with an uncertainty of 3 arcmin (radius, 90% conta... | grb 210726a: swift detection of a burst |
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 |
in this contribution, we demonstrate astro-h's capability to measure the chemical evolution in the high-z ( z < 3 ) universe by observing x-ray afterglows of gamma-ray bursts (grbs) and distant blazars. utilizing these sources as background light sources, the excellent energy resolution of astro-h/sxs allows us to d... | future astro-h observations of chemical evolution in high-z universe |
swift-xrt has performed follow-up observations of the integral-detected burst grb 200715a (mereghetti et al. gcn circ. 28110), collecting 3.3 ks of photon counting (pc) mode data between t0+7.5 ks and t0+26.2 ks. an uncatalogued x-ray source is detected consistent with being within 266 arcsec of the integral position a... | grb 200715a: swift-xrt afterglow detection |
at 10:27:23 ut, the swift burst alert telescope (bat) triggered and located grb 200528a (trigger=974827). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 176.637, +58.147 which is ra(j2000) = 11h 46m 33s dec(j2000) = +58d 08' 50" with an uncertainty of 3 arcmin (radius, 90% contai... | grb 200528a: swift detection of a burst |
we observed the field of grb 200729a (evans et al., gcn 28165) with the nordic optical telescope equipped with the alfosc imager. observations were carried out in the r and z filters, and started on 2020 jul 29.911 ut (2.2 hr after the trigger), as soon as visibility allowed. within the xrt position of the candidate af... | grb 200729a: not optical upper limits |
at 20:19:50 ut, the swift burst alert telescope (bat) triggered and located grb 201029a (trigger=1003002). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 229.601, +44.464 which is ra(j2000) = 15h 18m 24s dec(j2000) = +44d 27' 50" with an uncertainty of 3 arcmin (radius, 90% conta... | grb 201029a: swift detection of a burst |
swift-xrt has performed follow-up observations of the integral-detected burst grb 201214a (mereghetti et al. gcn circ. 29037), collecting 4.1 ks of photon counting (pc) mode data between t0+5.2 ks and t0+23.6 ks. one uncatalogued x-ray source has been detected consistent with being within 246 arcsec of the integral pos... | grb 201214a: swift-xrt observations |
at 22:50:39 ut, the swift burst alert telescope (bat) triggered and located grb 200306c (trigger=960102). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 198.582, +11.255 which is ra(j2000) = 13h 14m 20s dec(j2000) = +11d 15' 18" with an uncertainty of 3 arcmin (radius, 90% contai... | grb 200306c: swift detection of a burst with an optical counterpart |
observations of the gamma-ray burst (grb) afterglows of gravitational wave (gw) detected binary neutron star (bns) mergers are likely to be valuable and, in the immediate future, rare. valuable, in part, because the afterglow encodes information about the inclination between the jet and earth, which can aid gw cosmolog... | modelling the long-term electromagnetic counterparts to gravitational wave events |
at 14:54:48 ut, the swift burst alert telescope (bat) triggered and located grb 230328b (trigger=1162001). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 290.986, +80.016 which is ra(j2000) = 19h 23m 57s dec(j2000) = +80d 00' 58" with an uncertainty of 3 arcmin (radius, 90% conta... | grb 230328b: swift detection of a burst with an optical afterglow |
at 05:47:26 ut, the swift burst alert telescope (bat) triggered and located grb 201020a (trigger=1000926). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 261.246, +31.425 which is ra(j2000) = 17h 24m 59s dec(j2000) = +31d 25' 30" with an uncertainty of 3 arcmin (radius, 90% conta... | grb 201020a: swift detection of a burst with an optical counterpart. |
grb 200405b (gcn 27497) occurred in a field that has been observed 5 times as part of the askap variables and slow transients (vast; murphy et al. 2013) pilot survey between 2019-08-27 and 2020-01-25. we have searched for radio emission from the bat ground-calculated position and the 4 uncatalogued x-ray sources detect... | grb 200405b: atca follow-up and askap limits on pre-burst radio emission |
at 19:58:03 ut, the swift burst alert telescope (bat) triggered and located grb 230405b (trigger=1163119). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 271.467, -47.070 which is ra(j2000) = 18h 05m 52s dec(j2000) = -47d 04' 12" with an uncertainty of 3 arcmin (radius, 90% conta... | grb 230405b: swift detection of a burst |
report using the bepicolombo (mgns) data we have further improved the previous ipn box for grb 230307a (kozyrev et al., gcn circ. 33425). the coordinates of the updated 3 sigma error box are: --------------------------------------------- ra(2000), deg dec(2000), deg --------------------------------------------- center:... | further improved ipn localization for grb 230307a |
at 20:27:18 ut, the swift burst alert telescope (bat) triggered and located grb 201021c (trigger=1001130). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 12.550, -55.839 which is ra(j2000) = 00h 50m 12s dec(j2000) = -55d 50' 20" with an uncertainty of 3 arcmin (radius, 90% contai... | grb 201021c: swift detection of a burst with an optical counterpart |
at 10:49:55 ut, the swift burst alert telescope (bat) triggered and located grb 230815a (trigger=1185505). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 184.772, -58.065 which is ra(j2000) = 12h 19m 05s dec(j2000) = -58d 03' 53" with an uncertainty of 3 arcmin (radius, 90% conta... | grb 230815a: swift detection of a burst |
at 02:50:03 ut, the swift burst alert telescope (bat) triggered and located grb 230728a (trigger=1181187). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 343.539, +28.151 which is ra(j2000) = 22h 54m 09s dec(j2000) = +28d 09' 03" with an uncertainty of 3 arcmin (radius, 90% conta... | grb 230728a: swift detection of a burst |
we analyze the distribution of afterglow light-curve decay indices, α, for the data set of 176 gamma-ray bursts (grbs) with known redshifts, observed by swift from 2005 january to 2014 july. the fitted slopes and normalization parameters of the correlations presented in this paper are derived using the d'agostini (2005... | vizier online data catalog: grb light-curve decay indices with swift (del vecchio+, 2016) |
at 11:23:51 ut, the swift burst alert telescope (bat) triggered and located grb 230805b (trigger=1183217). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 207.747, +31.185 which is ra(j2000) = 13h 50m 59s dec(j2000) = +31d 11' 05" with an uncertainty of 3 arcmin (radius, 90% conta... | grb 230805b: swift detection of a burst |
swift-xrt obtained further observations of the field of the maxi-detected burst grb 210102b (guo et al. gcn circ. 29223). the data were collected between t0+209.5 ks and t0+312.5 ks for a total exposure time of 2.5 ks, and are entirely in photon counting (pc) mode. source 1 (burrows et al., gcn circ. 29230) is not dete... | grb 210102b: further swift-xrt observations |
at 09:46:31 ut, the swift burst alert telescope (bat) triggered and located grb 201017a (trigger=1000613). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 36.633, +66.673 which is ra(j2000) = 02h 26m 32s dec(j2000) = +66d 40' 22" with an uncertainty of 3 arcmin (radius, 90% contai... | grb 201017a: swift detection of a burst |
at 10:11:55 on 2021-09-10 ut, the swift burst alert telescope (bat) triggered and located a burst from the soft gamma repeater swift j1555.2-5402 (trigger=1072706). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 238.773, -54.055 which is ra(j2000) = 15h 55m 05s dec(j2000) = -54d ... | swift detection of a burst from sgr swift j1555.2-5402 |
we have analysed 852s of swift/xrt data for grb 230423a (r.brivio et al., gcn circ. 33677), from t-t0=704.5 s to t+t0=4893.3 s after the bat trigger 1165354. the trigger was previously indicated as non-burst due to a low bat significance detection and the absence of an xrt counterpart (gcn circ. 33677). we found an unc... | grb 230423a: swift-xrt afterglow detection |
at 21:10:10 ut, the swift burst alert telescope (bat) triggered and located grb 210104b (trigger=1015919). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 53.601, +37.931 which is ra(j2000) = 03h 34m 24s dec(j2000) = +37d 55' 51" with an uncertainty of 3 arcmin (radius, 90% contai... | grb 210104b: swift detection of a burst |
at 00:45:35 ut, the swift burst alert telescope (bat) triggered and located grb 180404a (trigger=821881). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 83.564, -37.170 which is ra(j2000) = 05h 34m 15s dec(j2000) = -37d 10' 10" with an uncertainty of 3 arcmin (radius, 90% contain... | grb 180404a: swift detection of a burst with an optical afterglow |
we join gravitational-wave and electromagnetic data to implement a combined simultaneous fit of the gw170817 event. the ligo-virgo analysis includes the estimation of the inclination, the angle of the binary with respect to the gravitationa-wave detector network line of sight. from the observations of the afterglow, in... | the neutron star neutron star merger gw170817: a multi-messenger study |
we propose a continuation of our successful too program to observe short grbs detected by swift to identify the afterglow in x-rays by a sub-arcsecond position from chandra. our too program will increase the number of short grbs having an unambiguous host galaxy identification, and also provide a much less biased sampl... | identification of the host galaxy of swift short grbs by the chandra sub-arcsecond position |
the rapid infrared imager/spectrograph (rimas) is an instrument designed to observe gamma ray burst afterglows in the near infrared between 0.9 and 2.4 μm. dispersion in the moderate resolution mode (r~4000) is provided by a pair of znse grisms: one covering the y and j bands and the other covering the h and k. the qua... | machining a yj band grism in znse for the rapid infrared imager spectrograph (rimas): improvements in technique |
our objective is to examine the early periods of grb optical afterglow light curves to determine what fraction of the sample shows significant afterglow emission when swift uvot first arrives on target. therefore, we require a sample of grb afterglows that (a) are optically bright enough that we can expect to detect th... | vizier online data catalog: swift observations of gamma-ray burst afterglows (page+, 2019) |
using the andicam instrument on the 1.3m telescope at ctio, we obtained optical/ir imaging of the error region of grb 170531b (gcn 21171, evans et al.) at two epochs (with mid-exposure times of 2017-06-01 04:22 ut & 08:19 ut). for each epoch, several dithered images were obtained with total summed exposure times am... | grb 170531b: smarts optical/ir observations |
swift-xrt has performed further follow-up observations of the fermi/gbm (von kienlin gcn 30340) and swift/bat-guano detected burst grb 210626a (tohuvavohu et al., gcn circ. 30325), collecting 7.9 ks of photon counting (pc) mode data between t0+29.7 ks and t0+143 ks. the x-ray source detected in the first 1.4 ks of data... | grb 210626a: swift/xrt afterglow confirmation |
at 05:46:04 ut, the swift burst alert telescope (bat) triggered and located grb 220408a (trigger=1101675). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 202.402, +47.061 which is ra(j2000) = 13h 29m 36s dec(j2000) = +47d 03' 41" with an uncertainty of 3 arcmin (radius, 90% conta... | grb 220408a: swift detection of a burst with an optical counterpart, possibly associated with m51 |
"at 13:20:34.42 ut on 24 october 2023, the fermi gamma-ray burst monitor (gbm) triggered and located grb 231024a (trigger 719846439/231024556). this trigger was later followed up by goto (gompertz et al. 2023, gcn 34878), lcogt and ztf (iglesias-lópez et al. 2023, gcn 34881), and x-shooter (saccardi et al. 2023, gcn 34... | grb 231024a: fermi gbm observation |
at 19:23:03 ut, the swift burst alert telescope (bat) triggered and located grb 220813a (trigger=1120270). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 81.501, -32.985 which is ra(j2000) = 05h 26m 00s dec(j2000) = -32d 59' 06" with an uncertainty of 3 arcmin (radius, 90% contai... | grb 220813a: swift detection of a burst with an optical counterpart |
swift-xrt has performed follow-up observations of the swift/bat-guano-detected burst grb 220511a (delaunay et al. gcn circ. 32023), collecting 5.0 ks of photon counting (pc) mode data between t0+37.4 ks and t0+49.1 ks. the burst was also detected by fermi-gbm (gcn circ. 32018), agile (ursi et al., gcn 32021) and astros... | grb 220511a: swift-xrt observations |
at 01:47:39 ut, the swift burst alert telescope (bat) triggered and located grb 231104a (trigger=1194500). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 23.789, +83.791 which is ra(j2000) = 01h 35m 09s dec(j2000) = +83d 47' 27" with an uncertainty of 3 arcmin (radius, 90% contai... | grb 231104a: swift detection of a bright burst |
swift-xrt has performed follow-up observations of the fermi/gbm-detected burst grb 231129c in a series of observations tiled on the sky. the total exposure time is 1.5 ks, distributed over 4 tiles; the maximum exposure at a single sky location was 633 s. the data were collected between t0+19.3 ks and t0+35.4 ks, and ar... | grb 231129c: swift-xrt observations |
the afterglow of some short grbs displays a late-time rebrightening, visible in the near-infrared a few days after the burst. this late-time bump could be explained as kilonova emission, providing a direct link to neutron star mergers, and a compelling proof for the synthesis of heavy nuclei through the rapid neutron c... | identifying the fingerprints of r-process heavy metals in a short grb |
at 04:56:57 ut, the swift burst alert telescope (bat) triggered and located grb 230409b (trigger=1163401). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 329.530, +52.854 which is ra(j2000) = 21h 58m 07s dec(j2000) = +52d 51' 15" with an uncertainty of 3 arcmin (radius, 90% conta... | grb 230409b: swift detection of a burst |
photospheric emission from relativistic outflows may originate in two different regimes: photon decoupling within the outflow or radiative diffusion. i show that observed thermal component in the early afterglows of gamma-ray bursts can originate from such diffusive photospheres. | on diffusive photospheres in gamma-ray bursts |
at 21:00:34 ut, the swift burst alert telescope (bat) triggered and located grb 220427a (trigger=1104343). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 275.869, -56.253 which is ra(j2000) = 18h 23m 29s dec(j2000) = -56d 15' 09" with an uncertainty of 3 arcmin (radius, 90% conta... | grb 220427a: swift detection of a burst with an optical counterpart |
swift-xrt has performed follow-up observations of the fermi/lat-detected burst grb 190531b (axelsson et al. gcn circ. 24701), collecting 5.0 ks of photon counting (pc) mode data between t0+18.2 ks and t0+29.7 ks. eleven uncatalogued x-ray sources are detected, of which one ("source 8") is above the rass limit, and is t... | grb 190531b: swift-xrt afterglow detection |
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