GRB250502B

This page lists all entries on GRB250502B in GRBweb

Summary Fermi GBM GCN 40314 GCN 40317 GCN 40324

Summary table
Variable Value Source
GRB_name_Fermi GRB250502426
T0 10:13:53 UTC GCN_circulars,Fermi GBM final loc
ra 312.2600° Fermi_GBM
decl 14.5300° Fermi_GBM
pos_error 3.04e+00° Fermi_GBM
T90 18.173 s Fermi_GBM
T90_error 0.571 s Fermi_GBM
T90_start 10:13:53.171 UTC Fermi_GBM
fluence 3.49e-06 erg/cm² Fermi_GBM
fluence_error 1.74e-08 erg/cm² Fermi_GBM
T100 18.344 s
GBM_located True
mjd 60797.42630787037 GCN_circulars,Fermi GBM final loc
Fermi GBM table
GRB_name_Fermi GRB250502426
trigger_name bn250502426
ra 312.2600°
decl 14.5300°
pos_error 3.04e+00°
datum 2025-05-02
t_trigger 10:13:53.168 UTC
T90 18.173 s
T90_error 0.571 s
T90_start 10:13:53.171 UTC
fluence 3.49e-06 erg/cm²
fluence_error 1.74e-08 erg/cm²
flux_1024 4.56e+00 erg/cm²/s
flux_1024_error 2.37e-01 erg/cm²/s
flux_1024_time 4.99e+00 erg/cm²/s
flux_64 6.27e+00 erg/cm²/s
flux_64_error 1.06e+00 erg/cm²/s
GCN 40314 table
GRB_name GRB250502B
GCN_number 40314
Detection_method Fermi GBM final loc
t_trigger 10:13:53 UTC
ra 312.3000°
decl 14.5000°
Circular_text TITLE: GCN CIRCULAR NUMBER: 40314 SUBJECT: GRB 250502B: Fermi GBM Final Real-time Localization DATE: 25/05/02 10:24:22 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM The Fermi GBM team reports the detection of a likely LONG GRB At 10:13:53 UT on 2 May 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250502B (trigger 767873638.16821 / 250502426). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 312.3, Dec = 14.5 (J2000 degrees, equivalent to J2000 20h 49m, 14d 30'), with a statistical uncertainty of 2.3 degrees. The angle from the Fermi LAT boresight is 56.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250502426/quicklook/glg_skymap_all_bn250502426.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/bn250502426/quicklook/glg_healpix_all_bn250502426.fit The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250502426/quicklook/glg_lc_medres34_bn250502426.gif
GCN 40317 table
GRB_name GRB250502B
GCN_number 40317
Detection_method Fermi GBM Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 40317 SUBJECT: Fermi GRB 250502B: Global MASTER-Net observations report DATE: 25/05/02 11:31:09 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs 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-OAFA robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Argentina (OAFA observatory of San Juan National University) started inspect of the Fermi GRB 250502B ( Fermi GBM team, GCN 40314) errorbox 74 sec after notice time and 110 sec after trigger time at 2025-05-02 10:15:44 UT, with upper limit up to 18.4 mag. Observations started at twilight. The observations began at zenith distance = 44 deg. The sun altitude is -11.2 deg. The galactic latitude b = -18 deg., longitude l = 61 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2858681 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 121 | 2025-05-02 10:15:44 | MASTER-OAFA | (20h 40m 38.20s , +13d 02m 12.4s) | C | 20 | 17.2 | 121 | 2025-05-02 10:15:44 | MASTER-OAFA | (20h 49m 58.93s , +13d 25m 00.9s) | C | 20 | 18.3 | 155 | 2025-05-02 10:16:23 | MASTER-OAFA | (20h 40m 37.90s , +13d 02m 09.6s) | C | 10 | 16.9 | 166 | 2025-05-02 10:16:23 | MASTER-OAFA | (20h 49m 58.55s , +13d 24m 57.5s) | C | 30 | 18.4 | 205 | 2025-05-02 10:17:07 | MASTER-OAFA | (20h 43m 52.56s , +13d 09m 28.3s) | C | 20 | 17.2 | 215 | 2025-05-02 10:17:08 | MASTER-OAFA | (20h 53m 13.53s , +13d 32m 15.9s) | C | 40 | 18.4 | 256 | 2025-05-02 10:17:54 | MASTER-OAFA | (20h 43m 52.15s , +13d 09m 25.1s) | C | 30 | 17.2 | 266 | 2025-05-02 10:17:54 | MASTER-OAFA | (20h 53m 13.16s , +13d 32m 11.9s) | C | 50 | 18.3 | 317 | 2025-05-02 10:18:50 | MASTER-OAFA | (20h 43m 51.68s , +13d 09m 20.3s) | C | 40 | 17.2 | 328 | 2025-05-02 10:18:50 | MASTER-OAFA | (20h 53m 12.71s , +13d 32m 06.8s) | C | 60 | 18.2 | 388 | 2025-05-02 10:19:56 | MASTER-OAFA | (20h 43m 51.16s , +13d 09m 15.6s) | C | 50 | 17.1 | 399 | 2025-05-02 10:19:56 | MASTER-OAFA | (20h 53m 12.22s , +13d 32m 01.2s) | C | 70 | 18.0 | 474 | 2025-05-02 10:21:12 | MASTER-OAFA | (20h 43m 50.52s , +13d 09m 08.5s) | C | 70 | 17.0 | 581 | 2025-05-02 10:22:48 | MASTER-OAFA | (20h 43m 49.65s , +13d 08m 59.4s) | C | 90 | 16.8 | 715 | 2025-05-02 10:24:52 | MASTER-OAFA | (20h 39m 05.67s , +13d 52m 50.6s) | C | 110 | 16.6 | 828 | 2025-05-02 10:27:21 | MASTER-OAFA | (20h 36m 00.38s , +11d 56m 35.1s) | C | 40 | 16.4 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.
GCN 40324 table
GRB_name GRB250502B
GCN_number 40324
Detection_method Fermi GBM Other
ra 314.5478°
decl 14.9247°
Circular_text TITLE: GCN CIRCULAR NUMBER: 40324 SUBJECT: GRB 250502B: DDOTI Optical Observations DATE: 25/05/02 15:03:40 GMT FROM: sahil.atri@students.uniroma2.eu Sahil Atri (U Roma), Rosa L. Becerra (U Roma), Alan M. Watson (UNAM), Camila Angulo Valdez (UNAM), Nat Butler (ASU), Simone Dichiara (Penn State University), Tsvetelina Dimitrova (ASU), Alexander Kutyrev (GSFC/UMD), William H. Lee (UNAM), Océlotl López (UNAM), Margarita Pereyra (UNAM) and Eleonora Troja (U Roma) report: We observed the field of the GRB 250502B detected by Fermi/GBM (Fermi GBM Team, GCN 40314) with the DDOTI/OAN wide-field imager at the Observatorio Astronómico Nacional on Sierra San Pedro Mártir (http://ddoti.astroscu.unam.mx) on the night of 2025-05-02 UTC. DDOTI observed the Fermi/GBM error region (Fermi GBM Team, GCN Circ. 40314), covering about 80% of the error region. DDOTI observed from 10:35 UTC to 11:41 UTC (from T+0.4 h to T+1.5 h after the trigger) and obtained a total exposure of 26.4 minutes, alternating with other scientific programs. Comparing our observations to the USNO-B1 and Pan-STARRS PS1 DR2 catalogues, we detect no any uncatalogued source at the position reported by Fermi GBM Team, GCN Circ. 40314) down to a 10-sigma limiting AB magnitude of: w > 19.71. Nevertheless, by serendipity, the field observed included the position at RA= 20:58:11.46, DEC=+14:55:28.9, coincident with SN 2025ian/ATLAS25ebg (SN Ia) (https://www.wis-tns.org/object/2025ian/discovery-cert; Tonry et al., TNS Astronomical Transient Report No. 252299). We measured with w=17.91+/0.08 at T+10.1 days. These values are not corrected for the Galactic extinction. We thank the staff of the Observatorio Astronómico Nacional on the Sierra of San Pedro Mártir.