GCN 45791: Fermi GRB 260930B: Global MASTER-Net observations report
2026-10-01T08:45:41.130Z | rev 0
M. Segura, F. Podesta, R.Podesta, E. Gonzalez (Observatorio Astronomico Felix Aguilar (OAFA)
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 (Lomonosov MSU)
D.Buckley (SAAO),
A. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity)
A.Sosnovskij (Lomonosov MSU)
A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory)
L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,
A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory)
R.Rebolo (The Instituto de Astrofisica de Canarias)
O.Gress, N.Budnev(ISU)
MASTER-Tavrida robotic telescope [1] located in Russia (Lomonosov MSU, SAI Crimea astronomical station) started inspect of the Fermi GRB 260930B ( Fermi GBM team, GCN 45789) errorbox 17491 sec after notice time and 17522 sec after trigger time at 2026-09-30 23:49:00 UT, with upper limit up to 14.4 mag. The observations began at zenith distance = 43 deg. The sun altitude is -38.6 deg.
MASTER-OAFA robotic telescope located in Argentina (OAFA observatory of San Juan National University) started inspect of the Fermi GRB 260930B errorbox 48817 sec after notice time and 48847 sec after trigger time at 2026-10-01 08:31:05 UT, with upper limit up to 18.0 mag. The observations began at zenith distance = 79 deg. The sun altitude is -22.2 deg.
The galactic latitude b = 20 deg., longitude l = 173 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=3515988
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________
17552 | 2026-09-30 23:49:00 | MASTER-Tavrida | (06h 51m 49.85s , +44d 03m 29.3s) | C | 60 | 14.4 |
48878 | 2026-10-01 08:31:05 | MASTER-OAFA | (07h 13m 36.47s , +37d 24m 41.7s) | C | 60 | 17.3 |
48938 | 2026-10-01 08:31:05 | MASTER-OAFA | (07h 13m 36.45s , +37d 24m 41.6s) | C | 180 | 18.0 | Coadd
49101 | 2026-10-01 08:34:49 | MASTER-OAFA | (07h 13m 41.79s , +37d 23m 09.4s) | C | 60 | 17.4 |
49176 | 2026-10-01 08:36:04 | MASTER-OAFA | (07h 13m 37.87s , +37d 24m 24.9s) | C | 60 | 17.6 |
49329 | 2026-10-01 08:38:36 | MASTER-OAFA | (07h 13m 41.02s , +37d 24m 23.0s) | C | 60 | 17.5 |
49407 | 2026-10-01 08:39:54 | MASTER-OAFA | (06h 57m 17.58s , +41d 11m 09.5s) | C | 60 | 17.3 |
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 45789: GRB 260930B: Fermi GBM Final Real-time Localization
2026-09-30T22:53:04.704Z | rev 0
The Fermi GBM team reports the detection of a likely SHORT GRB
At 18:57:03 UT on 30 Sep 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260930B (trigger 812487422.769082 / 260930790).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 104.2, Dec = 44.2 (J2000 degrees, equivalent to J2000 06h 56m, 44d 12'), with a statistical uncertainty of 6.2 degrees.
The angle from the Fermi LAT boresight is 150.0 degrees.
The skymap can be found here:https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260930790/quicklook/glg_skymap_all_bn260930790.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/bn260930790/quicklook/glg_healpix_all_bn260930790.fit
The GBM light curve can be found here:https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260930790/quicklook/glg_lc_medres34_bn260930790.gif
GCN 45788: GRB 260930A: Fermi GBM Final Real-time Localization
2026-09-30T20:09:49.063Z | rev 3
The Fermi GBM team reports the detection of a likely LONG GRB
At 19:59:09 UT on 30 Sep 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260930A (trigger 812491154.688938 / 260930833).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 175.2, Dec = -7.3 (J2000 degrees, equivalent to J2000 11h 40m, -7d 17'), with a statistical uncertainty of 8.1 degrees.
The angle from the Fermi LAT boresight is 61.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260930833/quicklook/glg_skymap_all_bn260930833.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/bn260930833/quicklook/glg_healpix_all_bn260930833.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260930833/quicklook/glg_lc_medres34_bn260930833.gif