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we observed the field of grb 190613b (fermi trigger 582115625.049376/190613449; gcn #24806, swift trigger 908329; d'ai et al., gcn #24807) 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 09:18 u... | grb 190613b: grond detection of the optical/nir afterglow |
at 00:28:33 ut, the swift burst alert telescope (bat) triggered and located a short grb 210919a (trigger=1073893). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 80.230, +1.274 which is ra(j2000) = 05h 20m 55s dec(j2000) = +01d 16' 27" with an uncertainty of 3 arcmin (radius, 90%... | grb 210919a: swift detection of a short burst |
at 13:29:37 ut, the swift burst alert telescope (bat) triggered and located grb 191220a (trigger=945344). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 281.391, +26.667 which is ra(j2000) = 18h 45m 34s dec(j2000) = +26d 40' 02" with an uncertainty of 3 arcmin (radius, 90% contai... | grb 191220a: swift detection of a burst |
swift-xrt has performed follow-up observations of the fermi-gbm and swift/bat-detected burst grb 201216a (gbm team, gcn circ. 29057; tohuvavohu et al. gcn circ. 29059), collecting 4.9 ks of photon counting (pc) mode data between t0+21.5 ks and t0+34.2 ks. no x-ray sources have been detected consistent with being within... | grb 201216a: swift-xrt observations |
at 18:01:51 ut, the swift burst alert telescope (bat) triggered and located grb 220611a (trigger=1110090). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 66.526d, -37.289d which is ra(j2000) = 04h 26m 06s dec(j2000) = -37d 17' 20 with an uncertainty of 3 arcmin (radius, 90% conta... | grb 220611a: swift detection of a burst |
at 10:19:01 ut, the swift burst alert telescope (bat) triggered and located grb 230420a (trigger=1164980). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 161.013, +32.087 which is ra(j2000) = 10h 44m 03s dec(j2000) = +32d 05' 11" with an uncertainty of 3 arcmin (radius, 90% conta... | grb 230420a: swift detection of a burst |
at 13:32:56 ut, the swift burst alert telescope (bat) triggered and located grb 191122a (trigger=938899). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 54.296, -32.176 which is ra(j2000) = 03h 37m 11s dec(j2000) = -32d 10' 32" with an uncertainty of 3 arcmin (radius, 90% contain... | grb 191122a: swift detection of a burst |
swift-xrt has performed follow-up observations of the swift/bat-guano-detected burst grb 220310c, collecting 4.6 ks of photon counting (pc) mode data between t0+102.8 ks and t0+120.2 ks. four uncatalogued x-ray sources have been detected, however none of them is above the rass limit or shows definitive signs of fading.... | grb 220310c: swift-xrt observations |
long-duration gamma-ray bursts 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 grbs from two different perspectives: ultraviolet absorption-line spe... | the host galaxies of long-duration gamma-ray bursts in absorption and in emission |
at 04:35:56 ut, the swift burst alert telescope (bat) triggered and located grb 191011a (trigger=928924). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 44.724, -27.845 which is ra(j2000) = 02h 58m 54s dec(j2000) = -27d 50' 40" with an uncertainty of 3 arcmin (radius, 90% contain... | grb 191011a: swift detection of a burst with an optical counterpart |
swift-xrt has performed follow-up observations of the fermi/lat-detected burst grb 220617a (di lalla et al. gcn circ. 32212), collecting 4.9 ks of photon counting (pc) mode data between t0+23.9 ks and t0+37.1 ks. five uncatalogued x-ray sources have been detected, however none of them is above the rass limit or shows d... | grb 220617a: swift-xrt observations |
"at 09:08:40.71 ut on 12 april 2020, the fermi gamma-ray burst monitor (gbm) triggered and located grb 200412b (trigger 608375325 / 200412381), which was also detected by the fermi lat (longo et al. 2020, gcn 27557) and observed to have a candidate optical afterglow by master (gcn 27555 & gcn 27556). the gbm on-gro... | grb 200412b: fermi gbm detection |
at 03:46:30 ut, the swift burst alert telescope (bat) triggered and located grb 201013a (trigger=999948). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 107.388, +57.036 which is ra(j2000) = 07h 09m 33s dec(j2000) = +57d 02' 09" with an uncertainty of 3 arcmin (radius, 90% contai... | grb 201013a: swift detection of a burst |
several thousand gamma-ray bursts (grbs) have now been detected, lasting from a fraction of a second to several hours, and with spectral energies peaking in the hundreds of kev range. a handful of bursts have been detected at gev energies, but very recently grb 190114c became the first grb to be identified in the tev r... | unpicking the exceptional properties of the first tev emitting gamma-ray burst |
at 21:04:43 ut, the swift burst alert telescope (bat) triggered and located grb 230116d (trigger=1149293). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 98.594, 49.840d which is ra(j2000) = 06h 34m 23s dec(j2000) = +49d 50' 24" with an uncertainty of 3 arcmin (radius, 90% contai... | grb 230116d: swift detection of a burst |
at 22:02:09 ut, the swift burst alert telescope (bat) triggered and located grb 170531b (trigger=755354). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 286.895, -16.426 which is ra(j2000) = 19h 07m 35s dec(j2000) = -16d 25' 34" with an uncertainty of 3 arcmin (radius, 90% contai... | grb 170531b: swift detection of a burst |
swift-xrt has performed follow-up observations of the swift/bat-detected burst grb 210413b (swift/bat did not successfully trigger on grb 210413b et al. gcn circ. 29819), collecting 4.9 ks of photon counting (pc) mode data between t0+185.0 ks and t0+206.7 ks. one uncatalogued x-ray source has been detected consistent w... | grb 210413b: swift-xrt observations |
at 05:28:01 ut, the swift burst alert telescope (bat) triggered and located grb 210517a (trigger=1048783). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 358.174, -39.105 which is ra(j2000) = 23h 52m 42s dec(j2000) = -39d 06' 17" with an uncertainty of 3 arcmin (radius, 90% conta... | grb 210517a: swift detection of a burst |
at 20:48:40 ut, the swift burst alert telescope (bat) triggered and located grb 211221a (trigger=1090472). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 78.938, +0.940 which is ra(j2000) = 05h 15m 45s dec(j2000) = +00d 56' 25" with an uncertainty of 3 arcmin (radius, 90% contain... | grb 211221a: swift detection of a burst |
at 01:41:00 ut, the swift burst alert telescope (bat) triggered and located grb 200122a (trigger=950330). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 209.981, +27.566 which is ra(j2000) = 13h 59m 55s dec(j2000) = +27d 33' 56" with an uncertainty of 3 arcmin (radius, 90% contai... | grb 200122a: swift detection of a burst |
at 05:44:52 ut, the swift burst alert telescope (bat) triggered and located grb 201209a (trigger=1011980). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 23.106, -1.763 which is ra(j2000) = 01h 32m 25s dec(j2000) = -01d 45' 47" with an uncertainty of 3 arcmin (radius, 90% contain... | grb 201209a: swift detection of a burst |
ixpe performed the first observation of x-ray polarization of a grb afterglow in the 2-8 kev energy range. ixpe observed grb 221009a from 2022-10-11t23:34:28utc to 2022-10-14t00:45:31utc for an effective exposure of 100 ks. from a quick-look analysis of the image-, time- and energy- averaged low-level instrument data (... | grb 221009a: ixpe preliminary upper limits of x-ray polarization |
at 13:32:33 ut, the swift burst alert telescope (bat) triggered and located grb 200216b (trigger=956824). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 160.461, +19.454 which is ra(j2000) = 10h 41m 51s dec(j2000) = +19d 27' 15" with an uncertainty of 3 arcmin (radius, 90% contai... | grb 200216b: swift detection of a burst |
swift-xrt has performed a second follow-up observation of the integral/spi-acs and swift-bat guano detected possible short burst grb 200405b (james delaunay et al. gcn circ. 27497), collecting ~1.2 ks of photon counting (pc) mode data between t0+550.8 ks and t0+584.0 ks. of the four uncatalogued x-ray sources reported ... | grb 200405b: further swift-xrt observations |
at 18:15:37 ut, the swift burst alert telescope (bat) triggered and located grb 220306b (trigger=1095288). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 5.378, +71.354 which is ra(j2000) = 00h 21m 31s dec(j2000) = +71d 21' 14" with an uncertainty of 3 arcmin (radius, 90% contain... | grb 220306b: swift detection of a burst |
at 11:21:20 ut, the swift burst alert telescope (bat) triggered and located grb 221216a (trigger=1144698). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 326.021, -34.405 which is ra(j2000) = 21h 44m 05s dec(j2000) = -34d 24' 17" with an uncertainty of 3 arcmin (radius, 90% conta... | grb 221216a: swift detection of a burst |
gamma-ray bursts (grbs) are the brightest transients in the mev sky, and their association with gravitational wave producing binary neutron star mergers is a topic at the forefront of multi-messenger astrophysics. grbs have been studied for decades with wide-field-of-view background-dominated monitoring instruments, bu... | gamma-ray bursts and gravitational wave counterparts with amego |
"we initiated observations with the chandra x-ray observatory of the position of the short-duration grb 200411a (fermi-gbm et al., gcn 27535; tohuvavohu et al., gcn 27536; bissaldi et al., gcn 27543) starting on 2020 april 15 00:16:54 ut, or at a mid-time of 3.95 days after the grb trigger. acis-s observations were tak... | grb 200411a: chandra observations indicative of temporal steepening |
"we initiated observations with the chandra x-ray observatory of the short-duration grb 201006a (barthelmy et al., gcn 28560; tohuvavohu, gcn 28563; hamburg et al., gcn 28564; lien et al., gcn 28567) starting on 2020 october 09 20:57:42 ut, with a median observation time of 3.98 days post-trigger. we obtained one acis-... | grb 201006a: chandra upper limit on the x-ray afterglow |
gamma-ray bursts are bright enough to be seen to very great distances and their afterglows can provide redshifts and positions for their host galaxies, and in some cases details of the ism and the igm close to the burst, irrespective of the host magnitude itself. thus grbs, despite their small numbers, offer a unique a... | identifying gamma-ray bursts at very high redshifts |
binary stellar systems that involve a neutron star or two neutron stars make interesting phenomena, x-ray bursts and kilo-novae, respectively, which involve explosive burning either in the proton-rich environment or in the neutron-rich environment. these are very important problems for nuclear astrophysics. first, the ... | experimental challenge to heavy element synthesis under explosive burning on neutron stars |
at 02:34:57 ut, the swift burst alert telescope (bat) triggered and located grb 200303a (trigger=959431). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 212.698, +51.360, which is ra(j2000) = 14h 10m 47s dec(j2000) = +51d 21' 35" with an uncertainty of 3 arcmin (radius, 90% conta... | grb 200303a: swift detection of a burst |
at 01:49:34 ut, the swift burst alert telescope (bat) triggered and located grb 200630a (trigger=980210). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 91.380, -60.789 which is ra(j2000) = 06h 05m 31s dec(j2000) = -60d 47' 20" with an uncertainty of 3 arcmin (radius, 90% contain... | grb 200630a: swift detection of a burst |
at 13:11:04 ut, the swift burst alert telescope (bat) triggered and located grb 200906a (trigger=994856). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 272.293, +67.852 which is ra(j2000) = 18h 09m 10s dec(j2000) = +67d 51' 08" with an uncertainty of 3 arcmin (radius, 90% contai... | grb 200906a: swift detection of a burst |
at 18:51:11 ut, the swift burst alert telescope (bat) triggered and located grb 200907b (trigger=995004). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 89.013, +6.911 which is ra(j2000) = 05h 56m 03s dec(j2000) = +06d 54' 38" with an uncertainty of 3 arcmin (radius, 90% containm... | grb 200907b: swift detection of a short burst |
we examined the latest, enhanced xrt position of the long grb 200729a detected by swift (evans et al., gcn 28165) in pan-starrs imaging. we downloaded the pan-starrs dr1 images and note the presence of a faint source detected within the xrt error circle (90% confidence osborne et al., gcn 28168) at: ra (j2000) = 12:17:... | grb 200729a: pan-starrs pre-explosion source detection |
swift-xrt has performed follow-up observations of the fermi/lat-detected burst grb 200219c (dirirsa et al. gcn circ. 27151) in a series of observations tiled on the sky. the total exposure time is 2.4 ks, distributed over 4 tiles; the maximum exposure at a single sky location was 2.4 ks. the data were collected between... | grb 200219c: swift-xrt afterglow detection |
at 00:27:30 ut, the swift burst alert telescope (bat) triggered and located grb 210421a (trigger=1044426). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 104.908, +4.934, which is ra(j2000) = 06h 59m 38s dec(j2000) = +04d 56' 03" with an uncertainty of 3 arcmin (radius, 90% conta... | grb 210421a: swift detection of a burst |
at 04:10:01 ut, the swift burst alert telescope (bat) triggered and located grb 210824a (trigger=1070157). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 232.132, +11.135 which is ra(j2000) = 15h 28m 32s dec(j2000) = +11d 08' 07" with an uncertainty of 3 arcmin (radius, 90% conta... | grb 210824a: swift detection of a burst |
we have analysed 4.8 ks of photon counting (pc) mode xrt data for the swift-bat-detected burst grb 230217a (moss et al. gcn circ. 33339), collected between t0+45.8 ks and t0+84.4 ks. two uncatalogued x-ray sources have been detected consistent with being within 296 arcsec of the swift-bat position, however none of them... | grb 230217a: swift-xrt observations |
swift-xrt has performed follow-up observations of the fermi/lat-detected burst grb 200412b (longo et al. gcn circ. 27557) in a series of observations tiled on the sky. the total exposure time is 4.9 ks, distributed over 7 tiles; the maximum exposure at a single sky location was 1.5 ks. the data were collected between t... | grb 200412b: swift-xrt afterglow detection |
at 12:25:05 ut, the swift burst alert telescope (bat) triggered and located grb 221201a (trigger=1142847). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 266.933, -68.260 which is ra(j2000) = 17h 47m 44s dec(j2000) = -68d 15' 33" with an uncertainty of 3 arcmin (radius, 90% conta... | grb 221201a: swift detection of a burst |
gamma-ray bursts (grbs) are hosts to extreme environments and can serve as cosmological and physics probes. however, much of the physical origin and nature of these events are still unknown. the compton spectrometer and imager (cosi) will provide additional insight into grbs and their environments. cosi is a compact co... | studying gamma-ray bursts with cosi |
frb 121102, the first-known repeating fast radio burst (frb) source, is associated with a dwarf host galaxy and compact, persistent radio source. in an effort to find other repeating frbs, first j141918.9+394036 (hereafter first j1419+3940) was identified in a search for similar persistent radio sources in dwarf host g... | no radio bursts detected from first j141918.9+394036 in green bank telescope observations |
at 06:37:56 ut, the swift burst alert telescope (bat) triggered and located grb 210308a (trigger=1036227). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 67.088, +37.411 which is ra(j2000) = 04h 28m 21s dec(j2000) = +37d 24' 39" with an uncertainty of 3 arcmin (radius, 90% contai... | grb 210308a: swift detection of a burst with an optical counterpart |
merging neutron star binary systems have long been thought to be the source of short gamma-ray bursts: highly energetic and collimated jets. this model was recently confirmed with observations of gw170817, which involved an off-axis jet. as the jet interacts with the external medium it emits multi-wavelength radiation ... | exploring an afterglow flux code to model jets from binary neutron star mergers |
grb 210411c (trigger=1042398) with a redshift z=2.826 (a. de ugarte postigo et al, 2021, gcn29806) was triggered and located by swift burst alert telescope (bat) (t. sbarrato et al, 2021, gcn 29794) with t90=12.8 sec in 15-150 kev (c. b. markwardt et al, 2021, gcn29810). the corresponding luminosity light curves of swi... | grb 210411c: a very significant early x-ray afterglow |
swift-xrt has performed follow-up observations of the swift/bat-guano-detected burst grb 221022a (aaron tohuvavohu et al. gcn circ. 32824), collecting 3.8 ks of photon counting (pc) mode data between t0+170.9 ks and t0+184.2 ks. six uncatalogued x-ray sources have been detected, however none of them is above the rass l... | grb 221022a: swift-xrt observations |
at 22:41:20 ut, the swift burst alert telescope (bat) triggered and located grb 221226b (trigger=1145959). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 22.917, -41.554 which is ra(j2000) = 01h 31m 40s dec(j2000) = -41d 33' 13" with an uncertainty of 3 arcmin (radius, 90% contai... | grb 221226b: swift detection of a burst |
we observed the location of the swift and fermi short grb 210323a (gropp et al., gcn 29699, hamburg et al., gcn 29709) with the gemini multi-object spectrograph (gmos) mounted on gemini-north. we obtained 15x90-sec imaging in r-band at a mid-time of 2021 march 24.637 ut (0.72 days post-burst). just to the east, outside... | grb 210323a: gemini-north optical source detection |
we performed photometric observations of the afterglow of grb 221202a detected by the swift burst alert telescope (bat) at 20:06:10.56 ut (caputo et al., gcn 33005; de wet et al., gcn 33007; beardmore et al., gcn 33008; strausbaugh et al., gcn 33009; evans et al., gcn 33010) with the fors2 instrument at the eso vlt-ut1... | grb 221202a: vlt/fors2 afterglow discovery |
at 23:39:24 ut, the swift burst alert telescope (bat) triggered and located grb 221016a (trigger=1129775). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 38.949, -34.624 which is ra(j2000) = 02h 35m 48s dec(j2000) = -34d 37' 26" with an uncertainty of 3 arcmin (radius, 90% contai... | grb 221016a: swift detection of a burst |
"we initiated our afterglow monitoring campaign, consisting of two epic-pn observations, with the xmm-newton observatory on the short-duration grb 211106a (tohuvavohu et al., gcn #31049) on 2021 november 20 (22:37:51 ut) and 2021 december 8 (19:46:37 ut) ut, with median observation times of ~15 and ~33 days post-trigge... | grb 211106a: xmm-newton monitoring campaign detections |
at 04:39:37 ut, the swift burst alert telescope (bat) triggered and located grb 200612a (trigger=977310). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 302.681, -45.357 which is ra(j2000) = 20h 10m 43s dec(j2000) = -45d 21' 24" with an uncertainty of 3 arcmin (radius, 90% contai... | grb 200612a: swift detection of a burst |
studying the spectra of long gamma-ray bursts (grbs) is providing greater clues about the environments in which they reside. much of our understanding to date comes from spectral data obtained in the gamma-ray to x-ray. studies of the environments of individual bursts have additionally included uv/optical data. however... | a homogeneous dataset for probing the environments of gamma-ray bursts |
at 09:10:29 ut, the swift burst alert telescope (bat) triggered and located grb 220618a (trigger=1110821). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 38.966, +55.214 which is ra(j2000) = 02h 35m 52s dec(j2000) = +55d 12' 49" with an uncertainty of 3 arcmin (radius, 90% contai... | grb 220618a: swift detection of a burst |
at 03:52:28 ut, the swift burst alert telescope (bat) triggered and located grb 200917a (trigger=996184). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 235.753, -4.695 which is ra(j2000) = 15h 43m 01s dec(j2000) = -04d 41' 42" with an uncertainty of 3 arcmin (radius, 90% contain... | grb 200917a: swift detection of a burst |
at 10:03:40 ut, the swift burst alert telescope (bat) triggered and located grb 210807a (trigger=1064221). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 76.677, +58.245 which is ra(j2000) = 05h 06m 43s dec(j2000) = +58d 14' 43" with an uncertainty of 3 arcmin (radius, 90% contai... | grb 210807a: swift detection of a burst with an optical counterpart |
swift-xrt has performed follow-up observations of the maxi-detected burst grb 200517a (niwano et al. gcn circ. 27750) in a series of observations tiled on the sky. the total exposure time is 1.1 ks, distributed over 7 tiles; the maximum exposure at a single sky location was 388 s. the data were collected between t0+8.0... | grb 200517a: swift-xrt afterglow detection |
at 17:04:36 on 2021-06-21 ut, the swift burst alert telescope (bat) triggered on a burst from the soft gamma repeater swift j1555.2-5402 (trigger=1057131). swift was already observing the source at that time. the bat on-board calculated location is ra, dec 238.812, -54.063 which is ra(j2000) = 15h 55m 15s dec(j2000) = ... | swift trigger 1057131: detection of a burst from sgr swift j1555.2-5402 |
at 10:19:44 ut, the swift burst alert telescope (bat) triggered and located grb 230123a (trigger=1150429). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 40.937, -65.676 which is ra(j2000) = 02h 43m 45s dec(j2000) = -65d 40' 33" with an uncertainty of 3 arcmin (radius, 90% contai... | grb 230123a: swift detection of a burst |
swift-xrt has performed follow-up observations of the maxi-detected burst grb 190708b (kawakubo et al. gcn circ. 25037) in a series of observations tiled on the sky. the total exposure time is 3.9 ks, distributed over 7 tiles; the maximum exposure at a single sky location was 1.2 ks. the data were collected between t0+... | grb 190708b: swift-xrt observations |
swift-xrt has performed follow-up observations of the swift/bat-guano-detected burst grb 211229a (tohuvavohu et al., gcn circ. 31334), also detected by fermi/gbm and gecam (fermi gbm team, gcn circ. 31329, zhao et al., gcn circ. 31331), collecting 5.0 ks of photon counting (pc) mode data between t0+43.6 ks and t0+66.8 ... | grb 211229a: swift-xrt and uvot observations |
following the x-ray afterglow detection (gcn 28300) and the identification of possible optical transient (gcn 28295) spatially coincident with the x-ray source, we present a further analysis of the kw detection of the short-duration, soft-spectrum, bright grb 200826a (gcns 28284, 28287, 28288, 28289, 28294). as observe... | grb 200826a: further analysis of the konus-wind data and classification |
the distribution of jet angles for short grbs is critical to constrainbecause it has direct implications for the true energy scale and eventrate, parameters of interest for gravitational wave detections. ourcurrent knowledge of the opening angle distribution comes from x-rayobservations >1 day after the burst. we pr... | late-time x-ray behavior of short grbs: implications for energetics and rates |
in this report we test for reliability any signatures of field galaxies clustering in the grb 021004 line of sight. the first signature is the bta and hubble grb 021004 field photometric redshift distribution with a peak at z ~ 0.5 estimated from multicolor photometry. the second signature is the mgii 2796,2803 absorpt... | clustering of galaxies around the grb 021004 sight-line at z ~ 0.5 |
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 |
leading models relate short gamma-ray bursts (sgrbs) to a relativistic jet launched by the black hole (bh)-accretion torus system that can be formed in a binary neutron star (bns) or a ns-bh binary merger. however, recent observations by swift have revealed a large fraction of sgrb events accompanied by x-ray afterglow... | short gamma-ray bursts in the ``time-reversal'' scenario |
at 01:46:16 ut, the swift burst alert telescope (bat) triggered and located grb 200109a (trigger=948361). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 307.171, +53.003 which is ra(j2000) = 20h 28m 41s dec(j2000) = +53d 00' 12" with an uncertainty of 3 arcmin (radius, 90% contai... | grb 200109a: swift detection of a burst |
tidal disruption events (tdes) are bursts of electromagnetic energy released when supermassive black holes (smbhs) at the centers of galaxies violently disrupt a star that passes too close. tdes provide a new window to study accretion onto smbhs; in some rare cases, this accretion leads to launching of a relativistic j... | a luminous jetted tidal disruption event discovered by the ztf optical survey |
gamma-ray bursts (grbs) are brief flashes of gamma-rays occurring at an average rate of a few per day throughout the universe, and it is generally assumed that grb follows star formation rate. the ultimate energy source of a grb is believed to be associated with an exploding star that is in a process of forming a black... | on the redshift distribution of gamma-ray bursts in the swift era: revisited |
it is well know that some peculiar gamma-ray bursts have a low luminosity prompt phase. from this set of 2-3 events, it was derived what should be the general properties of these events, without statistical validations. we have constructed a sample of events with a low-luminosity afterglow phase in order to perform thi... | a sample gamma-ray bursts with low luminosity afterglow to statistically derive their properties |
recent ground-based observations of tev photons have significantly deepened our understanding of the nature of gamma-ray bursts (grbs). however, many fundamental problems remain unsolved concerning the physical mechanisms behind grbs, necessitating the need for sufficient statistical data. the high altitude detection o... | prospects for detecting γ-ray bursts at very high energies with the hadar experiment |
i will describe the not transient explorer (nte). nte is designed to be an instrument that can be permanently mounted (together with fies) at the not where it will allow that not to a powerful facility for follow-up observations of transient sources like supernovae, kilo novae, and afterglows of gamma-ray bursts. in ad... | the not transient explore: an odyssey |
at 19:46:13 ut, the swift burst alert telescope (bat) triggered and located grb 180504a (trigger=830822). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 331.134, -14.655 which is ra(j2000) = 22h 04m 32s dec(j2000) = -14d 39' 17" with an uncertainty of 3 arcmin (radius, 90% contai... | grb 180504a: swift detection of a burst |
the aim of this thesis is to find variable stars from the rotseiiid fields data files. in order to determine the variable stars, a simple but effective software, that works seamlessly, has been developed. robotic optical transient search experiment (rotse) is a worldwide project with four robotic telescopes, establishe... | skysurvey results of rotseiiid data |
on 14 september 2015, the laser interferometer gravitational-wave observatory (ligo) in a pre-operative testing state at the time detected its first sign of gravitational-waves. the ligo team sprang into action, performing data-quality checks on this unexpected signal. within two days, they had sent a notification to 6... | the hunt for a counterpart to gw150914 |
at 16:14:21 ut, the swift burst alert telescope (bat) triggered and located grb 230414b (trigger=1164180). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 181.071, +53.127 which is ra(j2000) = 12h 04m 17s dec(j2000) = +53d 07' 36" with an uncertainty of 3 arcmin (radius, 90% conta... | grb 230414b: swift detection of a burst |
gamma-ray bursts are bright enough to be seen to very great distances and their afterglows can provide redshifts and positions for their host galaxies, and in some cases details of the ism and the igm close to the burst, irrespective of the host magnitude itself. thus grbs, despite their small numbers, offer a unique a... | identifying and studying gamma-ray bursts at very high redshifts |
at 12:06:28 ut, the swift burst alert telescope (bat) triggered and located grb 230510a (trigger=1167973). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 318.156, +34.443 which is ra(j2000) = 21h 12m 37s dec(j2000) = +34d 26' 33" with an uncertainty of 3 arcmin (radius, 90% conta... | grb 230510a: swift detection of a burst |
recent years have seen massive breakthroughs in the observations of gamma-ray bursts and other high-energy astrophysical transients. dynamical jet simulations have pro- gressed to a point where it is now becoming possible to fully numerically resolve gamma- ray burst (grb) jet evolution across scales. however, the mode... | numerics and theory of high-energy relativistic astrophysical transients |
swift-xrt has performed follow-up observations of the fermi/lat-detected burst grb 220107b (arimoto et al. gcn circ. 31409) in a series of observations tiled on the sky. the total exposure time is 1.3 ks, distributed over 2 tiles; the maximum exposure at a single sky location was 1.0 ks. the data were collected between... | grb 220107b: swift-xrt afterglow detection |
instruments such as the rotse, tortora, pi of the sky, master-net, and others have recorded single-band optical flux measurements starting as early as ~ 10 s after the gamma-ray trigger. the earliest measurements of optical spectral shape have been made only much later, on hour time scales, never on the time scale appr... | early-time colour variations in the grb 201015a afterglow |
we discuss the synchrotron emission of fast cooling electrons in shocks. the fast cooling electrons behind the shocks can generate a position-dependent inhomogeneous electron distribution if they do not have enough time to mix homogeneously. this can lead to a very different synchrotron spectrum in low-frequency bands ... | synchrotron spectrum of fast cooling electrons in grbs |
at 19:03:04 ut, the swift burst alert telescope (bat) triggered and located grb 210305a (trigger=1035922). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 319.814, +34.557 which is ra(j2000) = 21h 19m 15s dec(j2000) = +34d 33' 24" with an uncertainty of 3 arcmin (radius, 90% conta... | grb 210305a: swift detection of a burst |
gamma-ray bursts are bright enough to be seen to very great distances and their afterglows can provide redshifts and positions for their host galaxies, and in some cases details of the ism and the igm close to the burst, even for very faint hosts that are otherwise undetectable. thus grbs, despite their small numbers, ... | identifying gamma-ray bursts at very high redshifts |
swift-xrt has performed follow-up observations of the fermi/lat-detected burst grb 210520a (di lalla et al. gcn circ. 30062) in a series of observations tiled on the sky. the total exposure time is 5.6 ks, distributed over 19 tiles; the maximum exposure at a single sky location was 649 s. the data were collected betwee... | grb 210520a: swift-xrt observations |
swift-xrt has performed follow-up observations of the maxi-detected burst grb 220506a (urabe et al. gcn circ. 32001) in a series of observations tiled on the sky. the total exposure time is 1.2 ks, distributed over 6 tiles; the maximum exposure at a single sky location was 463 s. the data were collected between t0+38.2... | grb 220506a: swift-xrt afterglow detection |
the almost simultaneous observation of gravitational waves and gamma-rays from gw170817 proved that binary neutron star mergers are associated with short gamma-ray bursts. however, it is still unclear wheter gw170817 was a misaligned short grb or a weak, spherical outflow. chandra observations and a detailed modeling o... | the afterglows of binary neutron star mergers: telling a jet from a balloon |
swift-xrt has performed follow-up observations of the swift/bat-detected burst grb 190610a (palmer et al. gcn circ. 24783), collecting 5.0 ks of photon counting (pc) mode data between t0+292.3 ks and t0+300.5 ks. one uncatalogued x-ray source has been detected consistent with being within 187 arcsec of the swift/bat po... | grb 190610a: swift-xrt observations |
at 17:36:50 ut, the swift burst alert telescope (bat) triggered on swift j1818.0-1607 (trigger=969823). swift slewed immediately to the source. the bat on-board calculated location is ra, dec 274.498, -16.152, which is ra(j2000) = 18h 18m 00s dec(j2000) = -16d 09' 06" with an uncertainty of 3 arcmin (radius, 90% contai... | swift detection of a burst from sgr swift j1818.0-1607 |
at 13:09:59 ut, the swift burst alert telescope (bat) triggered and located grb 211211a (trigger=1088940). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 212.272, +27.884d which is ra(j2000) = 14h 09m 05s dec(j2000) = +27d 53' 01" with an uncertainty of 3 arcmin (radius, 90% cont... | grb 211211a: swift detection of a bright burst |
gamma-ray bursts (grbs) categorically produce broadband afterglow emission, but in some cases, emission in the optical band is less luminous than expected. the phenomenon of optical darkness has been studied extensively in long grbs (related to massive stellar explosions), with a number of proposed explanations, includ... | optical darkness in short-duration gamma-ray bursts |
the luminous, high-energy emission of gamma-ray bursts (grbs) makes them efficient probes of the high-redshift universe. the origin of the obscuration of gamma-ray burst afterglow is still unclear. we study the afterglows metal column densities along the line-of-sight of all swift-detected long grbs with an improved hi... | host galaxies are the obscurers of gamma-ray bursts |
the swirling disks of material that surround supermassive black holes are likely home to massive stars, neutron stars, and black holes. a new study explores whether we can detect the signatures of fiery explosions produced by these uniquely situated stars and stellar remnants.an unusual homeartists illustration of two ... | exploding stars in black hole disks |
grb 230409b was detected by the swift burst alert telescope (bat) at 04:56:57 ut on 9th april 2023 (beardmore et al., gcn 33592). the prompt emission mask-weighted bat light curve consists of a single-peaked structure with a t90 duration of 9.79 +- 2.59 sec in 15-350 kev energy range (palmer et al., gcn 33598). we comp... | grb 230409b: 3.6m dot near-infrared detection, afterglow confirmation |
swift-xrt has performed follow-up observations of the ipn-detected burst grb 230616a in a series of observations tiled on the sky. the total exposure time is 4.6 ks, distributed over 4 tiles; the maximum exposure at a single sky location was 2.0 ks. the data were collected between t0+111.3 ks and t0+140.7 ks, and are e... | grb 230616a: swift-xrt observations |
the digitised first byurakan survey (dfbs) provides low dispersion optical spectra for about 24 million sources. a two-step machine learning algorithm based on similarities to predefined templates is applied to select different classes of rare objects in the dataset automatically, for example late type stars, quasars a... | automatic source classification in digitised first byurakan survey |
we modelled dust grain-size distributions for carbonaceous and silicates dust, as well as for free-flying iron nanoparticles in the environment of a γ-ray burst (grb) afterglow, grb 180325a. this grb, at a redshift ($z$) of 2.2486, has an unambiguous detection of the 2175 å extinction feature with rv = 4.58 and av = 1.... | grb 180325a: dust grain-size distribution and interstellar iron nanoparticles contribution |
at 11:11:52 ut, the swift burst alert telescope (bat) triggered and located grb 220930a (trigger=1125809). swift slewed immediately to the burst. the bat on-board calculated location is ra, dec 64.737, +13.352 which is ra(j2000) = 04h 18m 57s dec(j2000) = +13d 21' 06" with an uncertainty of 3 arcmin (radius, 90% contai... | grb 220930a: swift detection of a burst |
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