GRB210807A

This page lists all entries on GRB210807A in GRBweb

Summary IPN Swift GCN 30600 GCN 30602 GCN 30603 GCN 30607 GCN 30616 GCN 30617 GCN 30618 GCN 30623 GCN 30624 GCN 30628 GCN 30637

Summary table
Variable Value Source
T0 10:03:40 UTC GCN_circulars,Swift Det
ra 76.6829° Swift
decl 58.2498° Swift
pos_error 5.57e-05° Swift
T90 156.3 s Swift
T90_start 10:03:40 UTC Swift
fluence 9.50e-06 erg/cm² Swift
T100 156.3 s
GBM_located False
mjd 59433.41921296297 GCN_circulars,Swift Det
IPN table
GRB_name GRB210807A
ra 76.6792°
decl 58.2500°
pos_error 5.00e-02°
Swift table
GRB_name GRB210807A
t_trigger 10:03:40 UTC
ra 76.6829°
decl 58.2498°
pos_error 5.57e-05°
T90 156.3 s
fluence 9.50e-06 erg/cm²
GCN 30600 table
GRB_name GRB210807A
GCN_number 30600
Detection_method Swift Det
t_trigger 10:03:40 UTC
ra 76.6770°
decl 58.2450°
Circular_text TITLE: GCN CIRCULAR NUMBER: 30600 SUBJECT: GRB 210807A: Swift detection of a burst with an optical counterpart DATE: 21/08/07 10:34:25 GMT FROM: David Palmer at LANL A. Y. Lien (GSFC/UMBC), C. Gronwall (PSU), J.D. Gropp (PSU), N. J. Klingler (GSFC/UMBC/CRESSTII), K. L. Page (U Leicester) and D. M. Palmer (LANL) report on behalf of the Neil Gehrels Swift Observatory Team: 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% containment, including systematic uncertainty). Because this is an image trigger, the actual light curve structure requires further ground data analysis. The 112-s image trigger indicates that this is a long burst. The XRT began observing the field at 10:07:02.3 UT, 201.9 seconds after the BAT trigger. XRT found a bright, uncatalogued X-ray source located at RA, Dec 76.6815, 58.2503 which is equivalent to: RA(J2000) = 05h 06m 43.56s Dec(J2000) = +58d 15' 01.1" with an uncertainty of 11.1 arcseconds (radius, 90% containment). This location is 20 arcseconds from the BAT onboard position, within the BAT error circle. No event data are yet available to determine the column density using X-ray spectroscopy. The initial flux in the 2.5 s image was 4.08e-09 erg cm^-2 s^-1 (0.2-10 keV). UVOT took a finding chart exposure of 150 seconds with the White filter starting 210 seconds after the BAT trigger. There is a candidate afterglow in the rapidly available 2.7'x2.7' sub-image at RA(J2000) = 05:06:43.90 = 76.68293 DEC(J2000) = +58:14:59.2 = 58.24978 with a 90%-confidence error radius of about 0.61 arc sec. This position is 3.3 arc sec. from the center of the XRT error circle. The estimated magnitude is 17.00 with a 1-sigma error of about 0.14. No correction has been made for the expected extinction corresponding to E(B-V) of 0.409. Burst Advocate for this burst is A. Y. Lien (amy.y.lien AT nasa.gov). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/)
GCN 30602 table
GRB_name GRB210807A
GCN_number 30602
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 30602 SUBJECT: GRB 210807A: BOOTES-5/JGT optical afterglow detection DATE: 21/08/07 14:09:06 GMT FROM: Youdong HU at IAA-CSIC Y.-D. Hu, T.-R. Sun, E. Fernandez-Garcia and A. J. Castro-Tirado, M.D. Caballero-Garcia (IAA-CSIC), D. Hiriart and W. H. Lee (UNAM), C. J. Perez del Pulgar and I. Carrasco (UMA), I. H. Park (SKKU) on behalf of a larger collaboration, report: The 60cm BOOTES-5/JGT robotic telescope at Observatorio Astronomico Nacional in San Pedro Martir (Mexico) automatically responded in 16 min to the Swift trigger of GRB 210807A (Lien et al., GCNC 30600). The first image (1s exposure, clear-filter) was obtained at 10:20:19.5 UT. We detected the optical afterglow at the position reported by Swift /UVOT (Lien et al. GCNC 30600). In the co-added image (10 x 1s exposures) we measure 17.8+/- 0.2 mag. Further analysis is ongoing. The magnitude is calibrated against the USNO-B1 catalog and is not corrected for Galactic extinction in the direction towards the GRB. We thank the staff at Observatorio Astronomico Nacional in San Pedro Martir for its excellent support.
GCN 30603 table
GRB_name GRB210807A
GCN_number 30603
Detection_method Swift-XRT Det
ra 76.6838°
decl 58.2498°
Circular_text TITLE: GCN CIRCULAR NUMBER: 30603 SUBJECT: GRB 210807A: Enhanced Swift-XRT position DATE: 21/08/07 16:09:23 GMT FROM: Phil Evans at U of Leicester P.A. Evans, M.R. Goad, J.P. Osborne and A.P. Beardmore (U. Leicester) report on behalf of the Swift-XRT team. Using 1337 s of XRT Photon Counting mode data and 4 UVOT images for GRB 210807A, we find an astrometrically corrected X-ray position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 76.68376, +58.24980 which is equivalent to: RA (J2000): 05h 06m 44.10s Dec (J2000): +58d 14' 59.3" with an uncertainty of 2.1 arcsec (radius, 90% confidence). This position may be improved as more data are received. The latest position can be viewed at http://www.swift.ac.uk/xrt_positions. Position enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 1177). This circular was automatically generated, and is an official product of the Swift-XRT team.
GCN 30607 table
GRB_name GRB210807A
GCN_number 30607
Detection_method Swift Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 30607 SUBJECT: Swift GRB 210807A: Global MASTER-Net observations report DATE: 21/08/07 20:08:23 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, E. Gorbovskoy, V.Kornilov, N.Tyurina, P.Balanutsa, A.Kuznetsov, F.Balakin, V.Vladimirov, D. Vlasenko, I.Gorbunov, D.Zimnukhov, V.Senik, T.Pogrosheva, D.Kuvshinov, D. Cheryasov (Lomonosov Moscow State University, SAI, Physics Department), R. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico Felix Aguilar OAFA), R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias), D. Buckley (South African Astronomical Observatory), O.A. Gres, N.M. Budnev, O.Ershova (Irkutsk State University, API), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), V. Yurkov, A. Gabovich, Yu. Sergienko (Blagoveschensk Educational State University) MASTER-Tavrida robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, SAI Crimea astronomical station) was pointed to the Swift GRB 210807A ( A. Y. Lien et al., GCN 30600) errorbox 32639 sec after notice time and 33871 sec after trigger time at 2021-08-07 19:28:12 UT, with upper limit up to 16.6 mag. The observations began at zenith distance = 76 deg. The sun altitude is -21.7 deg. The galactic latitude b = 11 deg., longitude l = 152 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1683291 We obtain a following upper limits. Tmid-T0 | Site |Filt.| Expt. | Limit| Comment _________|_____________________|_____|_______|______|________ 33962 | MASTER-Tavrida | C | 180 | 13.4 | 35859 | MASTER-Tavrida | C | 180 | 16.6 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.
GCN 30616 table
GRB_name GRB210807A
GCN_number 30616
Detection_method correction
Circular_text TITLE: GCN CIRCULAR NUMBER: 30616 SUBJECT: GRB 210807A: correction to the GCN Circ. #30614 Assy optical observations DATE: 21/08/08 10:25:45 GMT FROM: Alexei Pozanenko at IKI, Moscow V. Kim (FAI, Pulkovo Observatory), A. Pozanenko (IKI), M. Krugov (FAI), N. Pankov (HSE, IKI), S. Belkin (IKI) report on behalf of GRB IKI FuN: The name of GRB was indicated incorrectly in GCN Circ. #30614. The observation and photometry in GCN Circ. #30614 indeed refer to the GRB 210807A. We apologize for possible inconvenience.
GCN 30617 table
GRB_name GRB210807A
GCN_number 30617
Detection_method Swift-XRT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 30617 SUBJECT: GRB 210807A: Swift-XRT refined Analysis DATE: 21/08/08 12:24:18 GMT FROM: Phil Evans at U of Leicester A.P. Beardmore (U. Leicester), P.A. Evans (U. Leicester), J.P. Osborne (U. Leicester), M.G. Bernardini (INAF-OAB), E. Ambrosi (INAF-IASFPA) , M. Capalbi (INAF-IASFPA), D.N. Burrows (PSU), J. D. Gropp (PSU), J.A. Kennea (PSU) and A.Y. Lien report on behalf of the Swift-XRT team: We have analysed 3.1 ks of XRT data for GRB 210807A (Lien et al. GCN Circ. 30600), from 208 s to 86.2 ks after the BAT trigger. The data comprise 488 s in Windowed Timing (WT) mode with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Evans et al. (GCN Circ. 30603). The light curve can be modelled with a series of power-law decays. The initial decay index is alpha=0.71 (+/-0.09). At T+384 s the decay steepens to an alpha of 2.8 (+0.7, -0.6). The light curve breaks again at T+497 s to a decay with alpha=1.02 (+/-0.03), before a final break at T+32.3 ks s after which the decay index is 2.1 (+1.0, -0.7). A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.82 (+/-0.03). The best-fitting absorption column is 5.52 (+0.24, -0.23) x 10^21 cm^-2, in excess of the Galactic value of 3.4 x 10^21 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 1.71 (+0.15, -0.12) and a best-fitting absorption column consistent with the Galactic value. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 4.6 x 10^-11 (5.9 x 10^-11) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Total column: 3.4 (+0.6, -0.0) x 10^21 cm^-2 Galactic foreground: 3.4 x 10^21 cm^-2 Excess significance: <1.6 sigma Photon index: 1.71 (+0.15, -0.12) The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/01064221. This circular is an official product of the Swift-XRT team.
GCN 30618 table
GRB_name GRB210807A
GCN_number 30618
Detection_method Swift-UVOT Det
ra 76.6829°
decl 58.2498°
Circular_text TITLE: GCN CIRCULAR NUMBER: 30618 SUBJECT: GRB 210807A: Swift/UVOT Detection DATE: 21/08/08 21:07:25 GMT FROM: Sam LaPorte at PSU GRB 210807A: Swift/UVOT Detection S. J. LaPorte (PSU) and A. Y. Lien (GSFC/UMBC) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 210807A 210 s after the BAT trigger (Lien et al., GCN Circ. 30600). A source consistent with the XRT position (Lien et al. GCN Circ. 30600) is detected in the initial UVOT exposures. The preliminary UVOT position is: RA (J2000) = 05:06:43.89 = 76.68289 (deg.) Dec (J2000) = +58:14:59.2 = 58.24979 (deg.) with an estimated uncertainty of 0.43 arc sec. (radius, 90% confidence). Preliminary detections and 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures are: Filter T_start(s) T_stop(s) Exp(s) Mag b 489 683 38 >17.84 u 639 659 19 >17.04 v 390 583 39 16.58+-0.25 uvw1 440 633 38 >17.12 uvw2 539 721 26 >17.08 white 234 383 147 16.93+-0.04 white 234 708 184 17.19+-0.05 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.409 in the direction of the burst (Schlegel et al. 1998).
GCN 30623 table
GRB_name GRB210807A
GCN_number 30623
Detection_method Swift-BAT Det
ra 76.6660°
decl 58.2570°
Circular_text TITLE: GCN CIRCULAR NUMBER: 30623 SUBJECT: GRB 210807A: Swift-BAT refined analysis DATE: 21/08/10 01:41:52 GMT FROM: Sibasish Laha at GSFC T. N. Ukwatta (LANL), S. D. Barthelmy (GSFC), J. R. Cummings (CPI), H. A. Krimm (NSF), S. Laha (GSFC/UMBC), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU), (i.e. the Swift-BAT team): Using the data set from T-239 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 210807A (trigger #1064221) (Lien et al., GCN Circ. 30600). The BAT ground-calculated position is RA, Dec = 76.666, 58.257 deg which is RA(J2000) = 05h 06m 39.7s Dec(J2000) = +58d 15' 25.6" with an uncertainty of 1.5 arcmin, (radius, sys+stat, 90% containment). The partial coding was 28%. The BAT light curve showed a complex structure with a duration of about ~200 sec. T90 (15-350 keV) is 156.30 +- 214.60 sec (estimated error including systematics). The time-averaged spectrum from -19.544 to 640.052 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.26 +- 0.08. The fluence in the 15-150 keV band is 9.5 +- 0.4 x 10^-06 erg/cm2. The 1-sec peak photon flux measured from T+70.52 sec in the 15-150 keV band is 1.8 +- 0.4 ph/cm2/sec. All the quoted errors are at the 90% confidence level. The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/1064221/BA/
GCN 30624 table
GRB_name GRB210807A
GCN_number 30624
Detection_method Swift-BAT Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 30624 SUBJECT: GRB 210807A: Detection by GRBAlpha DATE: 21/08/10 14:37:22 GMT FROM: Masanori Ohno at Hiroshima University J. Ripa (Masaryk U.), M. Ohno (Eotvos U./Hiroshima U.), H. Takahashi (Hiroshima U.), A. Pal, L. Meszaros, B. Csak (Konkoly Observatory), N. Werner, M. Topinka, F. Munz, F. Hroch (Masaryk U.), T. Urbanec, M. Kasal, A. Povalac (Brno U. of Technology), J. Hudec, J. Kapus, M. Frajt (Spacemanic s.r.o), R. Laszlo, M. Koleda (Needronix s.r.o), M. Smelko, P. Hanak, P. Lipovsky (Technical U. of Kosice), G. Galgoczi (Wigner Research Center/Eotvos U.), Yuusuke Uchida, Helen Poon, H. Matake, N. Uchida (Hiroshima U.), T. Enoto (Kyoto U.), Zs. Frei (Eotvos U.), Y. Fukazawa, K. Hirose (Hiroshima U.); S. Hisadomi (Nagoya U.), Y. Ichinohe (Rikkyo U.), L. L. Kiss (Konkoly Observatory), T. Mizuno (Hiroshima U.), K. Nakazawa (Nagoya U.), H. Odaka (Univ of Tokyo), K. Torigoe (Hiroshima U.) -- the GRBAlpha collaboration. The long duration GRB 210807A (Swift-BAT detection; Lien et al. GCN Circ. 30600) was detected by the GRBAlpha 1U CubeSat (Pal et al. Proc. SPIE 2020). This is the first time that a GRB was observed by a 1U CubeSat dedicated to gamma-ray burst observations. The data acquisition started at 10:05:14 UT and the tail part of the prompt emission, which consists of multiple peaks, was observed with a duration of about 80 sec. The 7.3 sigma detection significance was confirmed at around 10:06:00 UT. The light curve obtained by GRBAlpha is available here: https://grbalpha.konkoly.hu/static/share/GRB210807A.pdf GRBAlpha is a demonstration mission for a future CubeSats constellation (Werner et al. Proc. SPIE 2018). The detector of GRBAlpha consists of a 75 x 75 x 5 mm3 CsI scintillator read out by a SiPM array, covering the energy range from ~50 keV to ~1000 keV. GRBAlpha was launched on 2021 March 22 from Baikonur. After its commissioning phase, the scientific observations are now under way. To increase the duty cycle and the downlink rate, the upgrade of the on-board data acquisition software stack is in progress. The ground segment is also supported by the radio amateur community and it takes advantage of the SatNOGS network for increased data downlink volume.
GCN 30628 table
GRB_name GRB210807A
GCN_number 30628
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 30628 SUBJECT: GRB 210807A: Tautenburg observations DATE: 21/08/11 11:37:11 GMT FROM: Ana Nicuesa at TLS Tautenburg S. Schmidl, A. Nicuesa Guelbenzu, S. Klose, S. Melnikov, B. Stecklum, U. Laux (all Tautenburg) and J. Greiner (MPE Garching) report: We observed the field of GRB 210807A (Lien et al., GCN 30600) with the Tautenburg 1.34m Schmidt telescope equipped with the TAUKAM 6kx6k CCD camera. Observations started at 23:19 UT on August 7, about 13 hours after the GRB trigger. For the optical afterglow (Lien et al., GCN 30600; Hu et al., GCN 30602; LaPorte et al. GCN 30618) we measure the following magnitudes: r = 21.66 +/- 0.18, at a midtime of August 7, 23:28 UT, i = 21.25 +/- 0.19, at a midtime of August 8, 01:16 UT, z = 20.52 +/- 0.19, at a midtime of August 8, 01:26 UT. Second-epoch observations were performed the following night. The optical transient was not detected anymore: r 22.2, at a midtime of August 8, 23:34 UT, i 22.4, at a midtime of August 9, 00:38 UT, z 21.2, at a midtime of August 9, 01:20 UT. Given magnitudes are calibrated against the Pan-STARRS catalogue.
GCN 30637 table
GRB_name GRB210807A
GCN_number 30637
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 30637 SUBJECT: GRB 210807A: continued Assy, AbAO and Mondy observations DATE: 21/08/12 19:34:29 GMT FROM: Alexei Pozanenko at IKI, Moscow S. Belkin (IKI), A. Pozanenko (IKI), V. Kim (FAI, Pulkovo Observatory), R. Ya. Inasaridze (AbAO), E. Klunko (ISTP), M. Krugov (FAI), N. Pankov (HSE), D. Datashvili (AbAO), V. R. Ayvazian (AbAO), G. V. Kapanadze (AbAO) report on behalf of IKI GRB FuN: We continued observation of the GRB 210807A (Lien et al., GCN 30600; Ripa et al., GCN 30624) with AZT-20 of Assy observatory, AZT-33IK of Mondy observatory, and AS-32 of Abastumani observatory. The optical transient GRB 210807A (Lien et al., GCN 30600; Hu et al., GCN 30602; Lipunov et al., GCN 30607; Kim et al., GCNs 30614, 30616; LaPorte et al., GCN 30618; Schmidl et al., GCN 30628) was detected in almost all of our stacked images. Preliminary photometric results are presented below: Date UT start t-T0 Filter Exp. OT Err. UL(3sig) Observ. (mid, days) (s) 2021-08-07 23:46:09 0.58957 R 53*60 20.94 0.09 21.6 AbAO 2021-08-09 17:11:54 2.31822 R 30*120 22.6 0.35 22.5 Mondy 2021-08-10 17:22:17 3.32334 R 27*120 n/d n/d 22.7 Mondy 2021-08-10 21:33:07 3.50135 r(AB) 65*60 23.14 0.26 23.7 Assy The photometry is based on the nearby stars of the USNO-B1.0 catalog. USNO-B1.0_id R2 1482-0188929 16.72 1482-0188954 15.47 1482-0189006 15.38 and based on the same stars presented in PS1 catalog for r(AB) calibrations. The light curve plotted based on available data for can be found at http://grb.rssi.ru/GRB210807A/GRB210807A_LC.png The light curve can be approximated by broken power law with power law indices of -0.55 and -1.05 before and after break at about 0.22 days.