GRB 260107A
GCN Circular 43352
Subject
Fermi GRB 260107A: Global MASTER-Net observations report
Date
2026-01-08T15:38:08Z (2 months ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
Via
email
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 260107A ( Fermi GBM team, GCN 43350) errorbox 45 sec after notice time and 53 sec after trigger time at 2026-01-07 19:57:55 UT, with upper limit up to 16.7 mag. The observations began at zenith distance = 87 deg. The sun altitude is -22.6 deg.
The galactic latitude b = -47 deg., longitude l = 70 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=3098086
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________
59 | 2026-01-07 19:57:55 | MASTER-SAAO | (22h 46m 37.28s , +02d 30m 33.7s) | C | 10 | 16.1 |
93 | 2026-01-07 19:58:24 | MASTER-SAAO | (22h 46m 36.17s , +02d 30m 45.9s) | C | 20 | 16.4 |
131 | 2026-01-07 19:59:03 | MASTER-SAAO | (22h 46m 35.02s , +02d 30m 58.5s) | C | 20 | 16.3 |
196 | 2026-01-07 19:59:57 | MASTER-SAAO | (22h 44m 44.92s , +00d 59m 56.2s) | C | 40 | 16.7 |
260 | 2026-01-07 20:00:56 | MASTER-SAAO | (22h 44m 43.40s , +01d 00m 12.6s) | C | 50 | 16.3 |
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
GCN Circular 43350
Subject
GRB 260107A: Fermi GBM Final Real-time Localization
Date
2026-01-07T20:07:44Z (2 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 19:57:01 UT on 7 Jan 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260107A (trigger 789508626.671092 / 260107831).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 339.0, Dec = 2.0 (J2000 degrees, equivalent to J2000 22h 36m, 2d 00'), with a statistical uncertainty of 2.6 degrees.
The angle from the Fermi LAT boresight is 73.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260107831/quicklook/glg_skymap_all_bn260107831.png
The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260107831/quicklook/glg_healpix_all_bn260107831.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260107831/quicklook/glg_lc_medres34_bn260107831.gif