December 2025 - vsnet-grb-info - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-grb-info 41044] GRB 251203A: Fermi GBM Final Real-time Localization
by GCN Circulars 03 Dec '25

03 Dec '25

TITLE: GCN CIRCULAR NUMBER: 42968 SUBJECT: GRB 251203A: Fermi GBM Final Real-time Localization DATE: 25/12/03 11:49:53 GMT FROM: Cuán de Barra at UCD <cuan.debarra(a)ucdconnect.ie> The Fermi GBM team reports the detection of a likely LONG GRB "At 08:18:45.15 UT on 03 December 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 251203A (trigger 786442730/251203346). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 165.6, Dec = -46.9 (J2000 degrees, equivalent to J2000 11h 02m, 46d 54'), with a statistical uncertainty of 2.2 degrees. The angle from the Fermi LAT boresight is 58 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251203346/… The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251203346/… The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251203346/…" View this GCN Circular online at https://gcn.nasa.gov/circulars/42968. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 41043] EP251202a / GRB251202A: AstroSat CZTI detection
by GCN Circulars 03 Dec '25

03 Dec '25

TITLE: GCN CIRCULAR NUMBER: 42967 SUBJECT: EP251202a / GRB251202A: AstroSat CZTI detection DATE: 25/12/03 10:02:30 GMT FROM: Anuraag Arya at IIT Bombay <aryaanuraag910(a)gmail.com> A. Arya (IITB), A. Goyal (IITB), U. Pathak (IITB), M. Tembhurnikar (IUCAA), S. Salunke (IUCAA), Harsha K. H. (IUCAA), G. Waratkar (Caltech/IITB), A. Vibhute (IUCAA), V. Bhalerao (IITB), D. Bhattacharya (Ashoka University/IUCAA), A. R. Rao (IUCAA/TIFR), and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration: Analysis of AstroSat CZTI data with the CIFT framework (Sharma et al., 2021, JApA, 42, 73) showed the detection of GRB 251202A which was also detected by Fermi/GBM (Fermi GBM Team, GCN Circ. 42933) and is associated with EP251202a detected by Einstein Probe (Zhang et. al., GCN Circ. 42937). The source was clearly detected in the CZT detectors in the 20-200 keV energy range. The light curve peaks at 2025-12-02 01:51:01.50 UTC. The measured peak count rate associated with the burst is 118 (+37, -21) counts/s above the background in the combined data of all quadrants, with a total of 689 (+148, -156) counts. The local mean background count rate was 341 (+4, -5) counts/s. Using cumulative rates, we measure a T90 of 9.4 (+0.5, -1.3) s. The source was also faintly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. CZTI is built by a TIFR-led consortium of institutes across India, including VSSC, URSC, IUCAA, SAC, and PRL. The Indian Space Research Organisation funded, managed, and facilitated the project. CZTI GRB detections are reported regularly on the payload site at: http://astrosat.iucaa.in/czti/?q=grb View this GCN Circular online at https://gcn.nasa.gov/circulars/42967. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 41042] GRB 251202A / EP251202a: SVOM/VT optical observation
by GCN Circulars 03 Dec '25

03 Dec '25

TITLE: GCN CIRCULAR NUMBER: 42966 SUBJECT: GRB 251202A / EP251202a: SVOM/VT optical observation DATE: 25/12/03 05:27:52 GMT FROM: Yinuo Ma <mayn(a)bao.ac.cn> Y. N. Ma, Y. L. Qiu, C. Wu, H. L. Li, L. P. Xin, Z. H. Yao, X. H. Han, Y. Xu, J. Wang, P. P. Zhang, W. J. Xie, Y. J. Xiao, H. B. Cai, L. Lan, J. R. Xu, J. S. Deng, J. Y. Wei (NAOC), J. Palmerio (CEA), J. X. Cao, X. Tian (GXU), Y. Wang (PMO) report on behalf of the SVOM/VT team. SVOM/VT performed Target of Opportunity observations of GRB 251202A / EP251202a triggered by Fermi/GBM (Fermi GBM team, GCN 42933; Bala et al., GCN 42957) and EP/WXT (Zhang et al., GCN 42937; Liang et al., GCN 42946). The observation began at 2025-12-02T06:43:31 UTC, 4.905 hours after the trigger, in the VT_B (400nm-650nm) and VT_R (650nm-1000nm) channels simultaneously. With X-band data available, the optical counterpart (Li et al., GCN 42934; Zhu et al., GCN 42939; O’Neill et al., GCN 42947; Quirola-Vasquez et al., GCN 42948; Kuin & Moss, GCN 42956; Zheng et al., GCN 42964) was clearly detected within EP/FXT and Swift/XRT's errorbox (Zhang et al., GCN 42937; Sbarufatti et al., GCN 42943) in both VT_B and VT_R bands. The measurements in AB magnitude are as below: mid time (h) | exposure time (s) | band | mag (AB) | mag err -------------|-------------------|------|----------|-------- 5.307 | 22*50 | VT_B | 19.29 | 0.03 5.300 | 24*50 | VT_R | 18.86 | 0.03 16.816 | 24*50 | VT_B | 20.40 | 0.06 16.726 | 22*50 | VT_R | 19.75 | 0.04 Our photometry was not corrected for Galactic extinction. In the VT_R stacked images, we can clearly see an extended source (g=24.37, r=22.77, z=21.99) at the position 3 arcseconds away from the optical counterpart, compared to Legacy Survey DR10 catalogue, as mentioned by Li et al. (GCN 42934). The Space Variable Objects Monitor (SVOM) is a China-France joint mission led by the Chinese National Space Administration (CNSA, China), National Center for Space Studies (CNES, France) and the Chinese Academy of Sciences (CAS, China), which is dedicated to observing gamma-ray bursts and other transient phenomena in the energetic universe. VT was jointly developed by Xi'an Institute of Optics and Precision Mechanics (XIOPM), CAS and National astronomical observatories (NAOC), CAS. View this GCN Circular online at https://gcn.nasa.gov/circulars/42966. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 41041] GRB 251201B: Fermi GBM Observation
by GCN Circulars 02 Dec '25

02 Dec '25

TITLE: GCN CIRCULAR NUMBER: 42965 SUBJECT: GRB 251201B: Fermi GBM Observation DATE: 25/12/02 20:57:29 GMT FROM: Eva Palafox at INAOE <eva.palafox(a)gmail.com> Eva Palafox (INAOE) and C. Meegan (UAH) report on behalf of the Fermi Gamma-ray Burst Monitor Team: "At 16:26:24.22 UT on 01 December 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 251201B (trigger 786299189/251201685), which was also detected by Swift BAT (M. J. Moss et al. 2025, GCN 42924), and Swift XRT (J.P. Osborne et al. 2025, GCN 42927). The Fermi GBM on-ground location (GCN 42923) is consistent with the Swift BAT position. The angle from the Fermi LAT boresight is 119 degrees. The GBM light curve consists of a single emission episode with a duration (T90) of about 91 s (50-300 keV). The time-averaged spectrum from T0-22.5 to T0+105.5 s is best fit by a simple power law function with index -1.83 +/- 0.04. A power law function with an exponential high-energy cutoff fits equally well with power law index = -1.71 +/- 0.08 and Epeak = 269.8 +/- 166.0. The event fluence (10-1000 keV) in this time interval is (1.2 +/- 0.1)E-05 erg/cm^2. The 1-sec peak photon flux measured starting from T0+4.7 s in the 10-1000 keV band is 4 +/- 0.3 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog: https://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html For Fermi GBM data and info, please visit the official Fermi GBM Support Page: https://fermi.gsfc.nasa.gov/ssc/data/access/gbm/" View this GCN Circular online at https://gcn.nasa.gov/circulars/42965. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 41040] EP251202a/GRB 251202A: KAIT optical observations
by GCN Circulars 02 Dec '25

02 Dec '25

TITLE: GCN CIRCULAR NUMBER: 42964 SUBJECT: EP251202a/GRB 251202A: KAIT optical observations DATE: 25/12/02 20:38:22 GMT FROM: Weikang Zheng at UC Berkeley <weikang(a)berkeley.edu> WeiKang Zheng (UCB), Xuhui Han (NAOC), Pinpin Zhang (NAOC) and Alexei V. Filippenko (UCB) report on behalf of the KAIT GRB team: The 0.76-m Katzman Automatic Imaging Telescope (KAIT), located at Lick Observatory, observed the field of EP251202a/GRB 251202A (Zhang et al., GCN 42937; Liang et al., GCN 42946; Fermi GBM team, GCN 42933; Bala et al., GCN 42957) from 6.29 to 10.59 hours after the burst. A set of 60s clear (roughly R) filter images were obtained. We clearly detected the optical afterglow (Li et al., GCN 42934; Zhu et al., GCN 42939; O’Neill et al., GCN 42947; Quirola-Vasquez et al., GCN 42948; Kuin et al., GCN 42956) in our coadd images. We measure its brightness decayed from 18.7 +/- 0.1 mag (Vega; mid time 6.30 hours) to 19.3 +/- 0.2 mag (mid time of 10.55 hours) with a power-law decay index of 1.07. View this GCN Circular online at https://gcn.nasa.gov/circulars/42964. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 41039] EP251130a: ULL-ASTRO-MASTER late detection of the optical afterglow with LCO 1-m telescope at Teide Observatory
by GCN Circulars 02 Dec '25

02 Dec '25

TITLE: GCN CIRCULAR NUMBER: 42963 SUBJECT: EP251130a: ULL-ASTRO-MASTER late detection of the optical afterglow with LCO 1-m telescope at Teide Observatory DATE: 25/12/02 19:57:57 GMT FROM: Ismael Perez-Fournon at Instituto de Astrofisica de Canarias <ipf(a)iac.es> T. Tundidor Rodríguez, J. Basurto Merino, P.G. Berdayes, A. Caballero-Almagro, A. Cerón, M. Contreras, F. Díaz-Segado, T. Ferrer-Laviña, B. Gandolfi, V. Ghiraldo, J. Hernández Fung, L. Juliá-Maroto, E. Lekaroz-Urriza, M. Manzano García, E. Mejía-Martínez, J. Prieto Polo, M. Pulido-Torres, M. Quintana-Ansaldo, A. Schenone-Zanuzzi, A. Selezneva, E. Urquijo-Rodríguez (all ULL), M. Abdul-Masih (IAC and ULL), and I. Pérez-Fournon (IAC and ULL). We report on observations of the optical counterpart of the X-ray transient EP251130a, detected by the Wide-field X-ray Telescope (WXT) on board the Einstein Probe (EP) mission (Wu et al., GCN Circ. 42903) and with detections of Swift-XRT (Evans et al., GCN Circ. 42908) and of the EP Follow-up X-ray Telescope (FXT) (Zhang et al., GCN Circ. 42915). We observed the field of EP251130a with one of the two Las Cumbres Observatory (LCO) 1-m telescopes equipped with Sinistro cameras located at the LCO node at Teide Observatory, Tenerife, Canary Islands, Spain. The observation, a single exposure of 500 sec in the SDSS i' filter, started on 2025-12-01 at 23:31:37 UT, about 36.40 hours after the EP-WXT trigger. The optical counterpart first reported by Dornic et al. (GCN Circ. 42904) is clearly detected in our image with a magnitude of i' = 20.68 +/- 0.14 (AB), calibrated against PanSTARRS-1 DR2 stars and not corrected for Galactic extinction. Our result is consistent with other optical observations (Lipunov et al., GCN Circ. 42906; He et al., GCN Circ. 42914; Gupta et al., GCN Circ. 42916; Zheng et al., GCN Circ. 42917; van Dalen et al., GCN Circ. 42918; Moskvitin and Spiridonova, GCN Circ. 42919; Aryan et al., GCN Circ. 42921; Volnova et al., GCN Circ. 42922; Ma et al., GCN Circ. 42940; and Corcoran et al., GCN Circ. 42951). van Dalen et al. (GCN Circ. 42918) have reported a redshift of z = 4.035 using GTC OSIRIS+. This work makes use of observations from the Las Cumbres Observatory global telescope network (LCO program IAC2025B-010). These observations are part of a course in Astrophysical Techniques of the Master in Astrophysics of the Astrophysics Department of the University of La Laguna in collaboration with the Instituto de Astrofísica de Canarias (La Laguna, Tenerife, Canary Islands, Spain). This work made use of the Astro-COLIBRI platform (P. Reichherzer et al. 2021, ApJS, 256, 5). View this GCN Circular online at https://gcn.nasa.gov/circulars/42963. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 41038] Fermi GRB 251202B: Global MASTER-Net observations report
by GCN Circulars 02 Dec '25

02 Dec '25

TITLE: GCN CIRCULAR NUMBER: 42962 SUBJECT: Fermi GRB 251202B: Global MASTER-Net observations report DATE: 25/12/02 19:00:24 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov(a)xray.sai.msu.ru> V.Lipunov, E.Gorbovskoy, A.Kuznetsov, K.Zhirkov, I.Panchenko, N.Tiurina, P.Balanutsa, V.Topolev, D.Vlasenko, G.Antipov, A.Sankovich, Yu.Tselik, Ya.Kechin, V.Senik, A.Chasovnikov, K.Labsina, I. Gorbunov (Lomonosov MSU), O.Gress, N.Budnev (ISU), C.Francile, F. Podesta, R.Podesta, E. Gonzalez (Observatorio Astronomico Felix Aguilar (OAFA), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A.Sosnovskij (CrAO), A. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity), D.Buckley (SAAO), R.Rebolo (The Instituto de Astrofisica de Canarias), L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory) MASTER-SAAO robotic telescope [1] located in South Africa (South African Astronomical Observatory) started inspect of the Fermi GRB 251202B ( Fermi GBM team, GCN 42961) errorbox 566 sec after notice time and 598 sec after trigger time at 2025-12-02 18:37:01 UT, with upper limit up to 19.2 mag. Observations started at twilight. The observations began at zenith distance = 24 deg. The sun altitude is -12.7 deg. The galactic latitude b = -67 deg., longitude l = 38 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=3058648 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 629 | 2025-12-02 18:37:01 | MASTER-SAAO | (23h 04m 42.90s , -23d 23m 21.3s) | C | 60 | 17.6 | 629 | 2025-12-02 18:37:01 | MASTER-SAAO | (23h 06m 42.31s , -23d 38m 56.2s) | C | 60 | 18.4 | 689 | 2025-12-02 18:37:01 | MASTER-SAAO | (23h 06m 42.31s , -23d 38m 56.2s) | C | 180 | 19.2 | Coadd 708 | 2025-12-02 18:38:20 | MASTER-SAAO | (23h 04m 42.92s , -23d 23m 16.2s) | C | 60 | 17.6 | 708 | 2025-12-02 18:38:20 | MASTER-SAAO | (23h 06m 42.32s , -23d 38m 51.7s) | C | 60 | 18.4 | 787 | 2025-12-02 18:39:39 | MASTER-SAAO | (23h 04m 42.96s , -23d 23m 12.1s) | C | 60 | 17.7 | 787 | 2025-12-02 18:39:40 | MASTER-SAAO | (23h 06m 42.35s , -23d 38m 48.1s) | C | 60 | 18.4 | 866 | 2025-12-02 18:40:58 | MASTER-SAAO | (23h 04m 43.00s , -23d 23m 08.4s) | C | 60 | 17.7 | 866 | 2025-12-02 18:40:58 | MASTER-SAAO | (23h 06m 42.37s , -23d 38m 45.0s) | C | 60 | 18.5 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited. [1] - V.M. Lipunov, V.G. Kornilov, E.S. Gorbovskoy, N.A. Tiurina & A.S.Kuznetsov, 2023, Astronomical Robotic Networks and Operative Multichanel Astrophysics, Lomonosov MSU PRESS, 591pp. http : // www.pereplet.ru/lipunov/625.html View this GCN Circular online at https://gcn.nasa.gov/circulars/42962. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 41037] GRB 251202B: Fermi GBM Final Real-time Localization
by GCN Circulars 02 Dec '25

02 Dec '25

TITLE: GCN CIRCULAR NUMBER: 42961 SUBJECT: GRB 251202B: Fermi GBM Final Real-time Localization DATE: 25/12/02 18:37:45 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply(a)GIOC.nsstc.nasa.gov> The Fermi GBM team reports the detection of a likely SHORT GRB At 18:27:03 UT on 2 Dec 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 251202B (trigger 786392828.111108 / 251202769). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 347.2, Dec = -23.3 (J2000 degrees, equivalent to J2000 23h 08m, -23d 18'), with a statistical uncertainty of 4.5 degrees. The angle from the Fermi LAT boresight is 92.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251202769/… The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251202769/… The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251202769/… View this GCN Circular online at https://gcn.nasa.gov/circulars/42961. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 41036] IPN triangulation of GRB 251129B (short/hard)
by GCN Circulars 02 Dec '25

02 Dec '25

TITLE: GCN CIRCULAR NUMBER: 42960 SUBJECT: IPN triangulation of GRB 251129B (short/hard) DATE: 25/12/02 18:31:26 GMT FROM: Dmitry Svinkin at Ioffe Institute <svinkin(a)mail.ioffe.ru> A.S. Kozyrev, D.V. Golovin, M.L. Litvak, I.G. Mitrofanov, and A.B. Sanin on behalf of the HEND/Mars Odyssey team, D. Svinkin, D. Frederiks, A. Lysenko, A. Ridnaia, and T. Cline on behalf of the Konus-Wind team, E. Burns on behalf of the IPN, S. Barthelmy, J. Cummings, H. Krimm, D. Palmer, A. Tohuvavohu, and J. DeLaunay on behalf of the Swift-BAT team, and W. Boynton, C. Fellows, K. Harshman, H. Enos, R. Starr, and A.S. Gardner on on behalf of the GRS-Odyssey GRB team, report: The short-duration GRB 251129B (AstroSat-CZTI detection: Salunke et al., GCN 42958) was detected by Konus-Wind, Swift(BAT), Mars-Odyssey (HEND), and AstroSat (CZTI), at about 35494 s UT (09:51:34). The burst was outside the coded field of view of the BAT. We have triangulated it to a preliminary, 3 sigma error box whose coordinates are: --------------------------------------------- RA(2000), deg Dec(2000), deg --------------------------------------------- Center: 124.862 (08h 19m 27s) +76.391 (+76d 23' 28") Corners: 118.469 (07h 53m 53s) +78.048 (+78d 02' 53") 119.970 (07h 59m 53s) +77.774 (+77d 46' 26") 129.621 (08h 38m 29s) +74.606 (+74d 36' 22") 128.692 (08h 34m 46s) +74.931 (+74d 55' 51") --------------------------------------------- The error box area is 617 sq. arcmin, and its maximum dimension is 4.32 deg (the minimum one is 2.6 arcmin). The Sun distance was 117 deg. The localization may be improved. A triangulation map and HEALPix FITS file are posted at http://www.ioffe.ru/LEA/GRBs/GRB251129_T35496/IPN/ The HEALPix triangulation map is the multi-order HEALPix in units of probability density. The Konus-Wind time history and spectrum will be given in a forthcoming GCN Circular. View this GCN Circular online at https://gcn.nasa.gov/circulars/42960. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 41035] GRB251129A/EP251129a: Swift UVOT detection
by GCN Circulars 02 Dec '25

02 Dec '25

TITLE: GCN CIRCULAR NUMBER: 42959 SUBJECT: GRB251129A/EP251129a: Swift UVOT detection DATE: 25/12/02 18:31:14 GMT FROM: Paul Kuin at MSSL <npkuin(a)gmail.com> N.P.M. Kuin (UCL-MSSL) and B. Cenko (NASA/GSFC) report on behalf of the Swift/UVOT team: The Swift/UVOT began observations of the field of GRB 251129A 16.8 ks after the SVOM trigger (Tan et al., GCN Circ. 42877). GRB251129A was also detected by the EP (Wu et al, GCN Circ. 16828). The optical afterglow consistent with the SVOM/COLIBRI position (Angulo et al. GCN Circ. 42880; Watson, GCN Circ. 42883) is detected in the initial UVOT exposures. Preliminary 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) are:: Filter T_start(s) T_stop(s) Exp(s) Mag white 16828 17147 315 19.63 +/- 0.07 white 27564 28089 502 19.69 +/- 0.12 white 111007 117142 1044 20.22 +/- 0.12 white 227072 234439 2745 20.92 +/- 0.17 u 16503 16823 315 20.06 +/- 0.30 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.025 in the direction of the burst (Schlegel et al. 1998). View this GCN Circular online at https://gcn.nasa.gov/circulars/42959. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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