GRB 250128A
GCN Circular 39051
Subject
GRB 250128A: Fermi GBM Final Real-time Localization
Date
2025-01-28T10:44:09Z (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 LONG GRB
At 10:33:42 UT on 28 Jan 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250128A (trigger 759753227.594888 / 250128440).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 284.0, Dec = 62.3 (J2000 degrees, equivalent to J2000 18h 56m, 62d 17'), with a statistical uncertainty of 5.4 degrees.
The angle from the Fermi LAT boresight is 109.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250128440/quicklook/glg_skymap_all_bn250128440.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/bn250128440/quicklook/glg_healpix_all_bn250128440.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250128440/quicklook/glg_lc_medres34_bn250128440.gif
GCN Circular 39052
Subject
Fermi GRB 250128A: Global MASTER-Net observations report
Date
2025-01-28T11:32:15Z (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 250128A ( Fermi GBM team, GCN 39051) errorbox 568 sec after notice time and 595 sec after trigger time at 2025-01-28 10:43:38 UT, with upper limit up to 15.8 mag. Observations started at twilight. The observations began at zenith distance = 53 deg. The sun altitude is -8.6 deg.
The galactic latitude b = 23 deg., longitude l = 93 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=2758800
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________
597 | 2025-01-28 10:43:38 | MASTER-Tunka | (18h 55m 15.13s , +62d 26m 57.5s) | C | 1 | 15.2 |
598 | 2025-01-28 10:43:38 | MASTER-Tunka | (18h 55m 15.13s , +62d 26m 57.5s) | C | 3 | 15.8 | Coadd
602 | 2025-01-28 10:43:43 | MASTER-Tunka | (18h 55m 15.05s , +62d 26m 57.5s) | C | 1 | 15.1 |
608 | 2025-01-28 10:43:49 | MASTER-Tunka | (18h 55m 15.04s , +62d 26m 56.9s) | C | 1 | 15.1 |
613 | 2025-01-28 10:43:54 | MASTER-Tunka | (18h 55m 15.13s , +62d 26m 56.7s) | C | 1 | 15.3 |
Filter C is a clear (unfiltred) band.
The observation and reduction will continue.
The message may be cited.