GRB 260112B
GCN Circular 43399
Subject
GRB 260112B: GECAM-B observation
Date
2026-01-14T15:16:26Z (2 months ago)
From
guohx@ihep.ac.cn
Via
Web form
Hao-Xuan Guo, Chen-Wei Wang, Shao-Lin Xiong (IHEP) report on behalf of GECAM team:
GECAM-B was triggered on-ground by GRB 260112B, at 2026-01-12T20:45:55.000 UTC (denoted as T0), which is also detected by Fermi/GBM (Fermi GBM team, GCN #43380).
According to the GECAM-B light curves in about 70-6000 keV, this burst mainly consists of multiple pulses with a duration (T90) of 15.9 +1.7/-2.2 s.
The GECAM-B light curve can be found here:
https://www.bursthub.cn//admin/static/gecambgrb260112B.png
Gravitational wave high-energy Electromagnetic Counterpart All-sky Monitor (GECAM) mission originally consists of two micro-satellites (GECAM-A and GECAM-B) launched in Dec. 2020. As the third member of GECAM constellation, GECAM-C was launched onboard SATech-01 experimental satellite in July 2022. GECAM mission is funded by the Chinese Academy of Sciences (CAS).
GCN Circular 43380
Subject
GRB 260112B: Fermi GBM Final Real-time Localization
Date
2026-01-12T20:56:32Z (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 20:45:51 UT on 12 Jan 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260112B (trigger 789943556.635812 / 260112865).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 238.6, Dec = -3.5 (J2000 degrees, equivalent to J2000 15h 54m, -3d 30'), with a statistical uncertainty of 7.8 degrees.
The angle from the Fermi LAT boresight is 34.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260112865/quicklook/glg_skymap_all_bn260112865.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/bn260112865/quicklook/glg_healpix_all_bn260112865.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260112865/quicklook/glg_lc_medres34_bn260112865.gif