GRB 250107B
GCN Circular 38839
Subject
GRB 250107B: Fermi GBM Final Real-time Localization
Date
2025-01-07T11:44:24Z (5 months ago)
From
Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>
Via
email
The Fermi GBM team reports the detection of a likely SHORT GRB
At 11:34:04 UT on 7 Jan 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250107B (trigger 757942449.293284 / 250107482).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 110.8, Dec = 59.6 (J2000 degrees, equivalent to J2000 07h 23m, 59d 36'), with a statistical uncertainty of 25.9 degrees.
The angle from the Fermi LAT boresight is 69.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250107482/quicklook/glg_skymap_all_bn250107482.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/bn250107482/quicklook/glg_healpix_all_bn250107482.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250107482/quicklook/glg_lc_medres34_bn250107482.gif
GCN Circular 38842
Subject
Fermi GRB 250107B: Global MASTER-Net observations report
Date
2025-01-07T16:33:51Z (5 months ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
Via
email
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-Tunka robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Applied Physics Institute, Irkutsk State University) started inspect of the Fermi GRB 250107B ( Fermi GBM team, GCN 38839) errorbox 14186 sec after notice time and 14221 sec after trigger time at 2025-01-07 15:31:05 UT, with upper limit up to 19.3 mag. The observations began at zenith distance = 12 deg. The sun altitude is -55.2 deg.
The galactic latitude b = 28 deg., longitude l = 157 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=2736509
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________
14251 | 2025-01-07 15:31:05 | MASTER-Tunka | (04h 13m 49.68s , +54d 32m 00.7s) | C | 60 | 19.1 |
14311 | 2025-01-07 15:31:05 | MASTER-Tunka | (04h 13m 49.68s , +54d 32m 00.8s) | C | 180 | 19.1 | Coadd
14483 | 2025-01-07 15:34:57 | MASTER-Tunka | (04h 27m 33.78s , +54d 31m 30.6s) | C | 60 | 19.3 |
14543 | 2025-01-07 15:34:57 | MASTER-Tunka | (04h 27m 33.77s , +54d 31m 30.6s) | C | 180 | 19.3 | Coadd
14557 | 2025-01-07 15:36:11 | MASTER-Tunka | (03h 58m 53.28s , +56d 25m 31.5s) | C | 60 | 18.8 |
14617 | 2025-01-07 15:36:11 | MASTER-Tunka | (03h 58m 53.29s , +56d 25m 31.6s) | C | 180 | 18.8 | Coadd
14719 | 2025-01-07 15:38:53 | MASTER-Tunka | (04h 13m 21.56s , +56d 24m 57.2s) | C | 60 | 19.0 |
14953 | 2025-01-07 15:42:46 | MASTER-Tunka | (04h 13m 49.60s , +54d 32m 46.9s) | C | 60 | 19.0 |
15109 | 2025-01-07 15:45:23 | MASTER-Tunka | (04h 27m 30.11s , +54d 32m 56.0s) | C | 60 | 19.1 |
15183 | 2025-01-07 15:46:37 | MASTER-Tunka | (03h 58m 51.42s , +56d 25m 51.6s) | C | 60 | 18.6 |
15803 | 2025-01-07 15:56:57 | MASTER-Tunka | (04h 13m 16.36s , +56d 26m 13.9s) | C | 60 | 17.8 |
16036 | 2025-01-07 16:00:50 | MASTER-Tunka | (04h 13m 42.42s , +54d 32m 55.6s) | C | 60 | 17.5 |
16206 | 2025-01-07 16:03:40 | MASTER-Tunka | (04h 27m 32.57s , +54d 33m 24.4s) | C | 60 | 17.0 |
16282 | 2025-01-07 16:04:56 | MASTER-Tunka | (03h 58m 39.55s , +56d 26m 20.1s) | C | 60 | 16.6 |
16530 | 2025-01-07 16:09:04 | MASTER-Tunka | (04h 13m 12.79s , +56d 26m 02.5s) | C | 60 | 17.4 |
16874 | 2025-01-07 16:14:47 | MASTER-Tunka | (04h 15m 44.55s , +52d 38m 47.2s) | C | 60 | 17.8 |
17283 | 2025-01-07 16:21:36 | MASTER-Tunka | (04h 01m 08.58s , +54d 33m 43.0s) | C | 60 | 18.4 |
Filter C is a clear (unfiltred) band.
The observation and reduction will continue.
The message may be cited.