GRB250101B

This page lists all entries on GRB250101B in GRBweb

Summary Fermi GBM GCN 38766 GCN 38767 GCN 38793 GCN 38903

Summary table
Variable Value Source
GRB_name_Fermi GRB250101968
T0 23:14:12 UTC GCN_circulars,Fermi GBM final loc
ra 70.8700° Fermi_GBM
decl -3.2500° Fermi_GBM
pos_error 3.66e+00° Fermi_GBM
T90 4.928 s Fermi_GBM
T90_error 0.59 s Fermi_GBM
T90_start 23:14:12.396 UTC Fermi_GBM
fluence 7.71e-04 erg/cm² Fermi_GBM
fluence_error 2.99e-05 erg/cm² Fermi_GBM
T100 5.324 s
GBM_located True
mjd 60676.968194444446 GCN_circulars,Fermi GBM final loc
Fermi GBM table
GRB_name_Fermi GRB250101968
trigger_name bn250101968
ra 70.8700°
decl -3.2500°
pos_error 3.66e+00°
datum 2025-01-01
t_trigger 23:14:12.652 UTC
T90 4.928 s
T90_error 0.59 s
T90_start 23:14:12.396 UTC
fluence 7.71e-04 erg/cm²
fluence_error 2.99e-05 erg/cm²
flux_1024 1.46e+04 erg/cm²/s
flux_1024_error 2.37e+03 erg/cm²/s
flux_1024_time 1.09e+00 erg/cm²/s
flux_64 8.47e+04 erg/cm²/s
flux_64_error 5.83e+04 erg/cm²/s
GCN 38766 table
GRB_name GRB250101B
GCN_number 38766
Detection_method Fermi GBM final loc
t_trigger 23:14:12 UTC
ra 70.9000°
decl -3.2000°
Circular_text TITLE: GCN CIRCULAR NUMBER: 38766 SUBJECT: GRB 250101B: Fermi GBM Final Real-time Localization DATE: 25/01/01 23:24:52 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM The Fermi GBM team reports the detection of a likely LONG GRB At 23:14:12 UT on 1 Jan 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250101B (trigger 757466057.652354 / 250101968). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 70.9, Dec = -3.2 (J2000 degrees, equivalent to J2000 04h 43m, -3d 12'), with a statistical uncertainty of 3.3 degrees. The angle from the Fermi LAT boresight is 49.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250101968/quicklook/glg_skymap_all_bn250101968.png The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250101968/quicklook/glg_healpix_all_bn250101968.fit The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250101968/quicklook/glg_lc_medres34_bn250101968.gif
GCN 38767 table
GRB_name GRB250101B
GCN_number 38767
Detection_method Fermi GBM Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 38767 SUBJECT: Fermi GRB 250101B: Global MASTER-Net observations report DATE: 25/01/01 23:30:44 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V.Lipunov, E.Gorbovskoy, N.Tiurina, P.Balanutsa, , D.Vlasenko, I.Panchenko, A.Kuznetsov, G.Antipov, A.Sankovich, A.Sosnovskij, Yu.Tselik, M.Gulyaev, 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. 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 (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in South Africa (South African Astronomical Observatory) started inspect of the Fermi GRB 250101B ( Fermi GBM team, GCN 38766) errorbox 30 sec after notice time and 72 sec after trigger time at 2025-01-01 23:15:25 UT, with upper limit up to 17.9 mag. The observations began at zenith distance = 46 deg. The sun altitude is -34.5 deg. The galactic latitude b = -29 deg., longitude l = 201 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2730742 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 78 | 2025-01-01 23:15:25 | MASTER-SAAO | (04h 55m 50.35s , -02d 10m 31.1s) | C | 10 | 17.9 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.
GCN 38793 table
GRB_name GRB250101B
GCN_number 38793
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 38793 SUBJECT: GRB 250101B: SVOM/GRM observation DATE: 25/01/03 13:31:25 GMT FROM: wenlongzhang2018@163.com SVOM/GRM team: Wen-Long Zhang, Wen-Jun Tan, Chen-Wei Wang, Shi-Jie Zheng, Shao-Lin Xiong, Shuang-Nan Zhang (IHEP), report on behalf of the SVOM team: During the commissioning phase, SVOM/GRM detected GRB 250101B at 2025-01-01T23:14:12 UT (T0), which was also observed by Fermi/GBM (Fermi GBM Team, GCN 38766). With the event-by-event data downloaded through the X-band ground station, the GRM light curve shows that this burst consists of two main pulses with a T90 of 5.27 +/-1.24 s. This burst is located (from Fermi/GBM) at about 96.02 degrees from the SVOM optical axis, and outside the ECLAIRs field of view. The GRM light curve can be found here: https://www.bursthub.cn//admin/static/svgrb250101B.png The Space Variable Objects Monitor (SVOM) is a China-France joint mission led by the Chinese National Space Administration (CNSA), French Space Agency (CNES), and the Chinese Academy of Sciences (CAS), which is dedicated to observing gamma-ray bursts and other transient phenomena in the energetic universe. GRM is developed by the Institute of High Energy Physics (IHEP) of CAS. The SVOM point of contact for this burst is: Wen-Long Zhang (IHEP)(zhangwl@ihep.ac.cn)
GCN 38903 table
GRB_name GRB250101B
GCN_number 38903
Detection_method Fermi GBM Det
t_trigger 23:14:12.650 UTC
ra 70.8700°
decl -3.2500°
Circular_text TITLE: GCN CIRCULAR NUMBER: 38903 SUBJECT: GRB 250101B: Fermi GBM Observation DATE: 25/01/11 01:26:07 GMT FROM: oindabimukherjee@gmail.com O. Mukherjee (USRA), S. Bala (USRA) and C. Meegan (UAH) report on behalf of the Fermi Gamma-ray Burst Monitor Team: "At 23:14:12.65 UT on 01 January 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250101B (trigger 757466057/250101968). which was also detected by SVOM/GRM (Zhang et al. 2025, GCN 38793). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 70.87, Dec = -3.25 (J2000 degrees, equivalent to J2000 4h 43m, -3d 15'), with a statistical uncertainty of 3.29 degrees. (radius, 1-sigma containment, statistical only; there is additionally a systematic error which we have characterized as a mixture of two Gaussians, one with a radius of 1.8 degrees (52% contribution) and one with a radius of 4.1 degrees (47% contribution) [A. Goldstein et al. 2020, ApJ, 895, 1]). The angle from the Fermi LAT boresight is 49 degrees. The GBM light curve consists of a single emission episode with two distinct peaks with a duration (T90) of about 4.5 s (50-300 keV). The time-averaged spectrum from T0-1.0 to T0+5.1 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -0.34 +/- 0.09 and the cutoff energy, parameterized as Epeak, is 146 +/- 7 keV. The event fluence (10-1000 keV) in this time interval is (2.418 +/- 0.8)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0+0.77 s in the 10-1000 keV band is 5 +/- 0.2 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/"