GRB 260314A
GCN Circular 44028
Subject
GRB 260314A: Glowbug gamma-ray detection
Date
2026-03-16T16:43:10Z (17 days ago)
From
C.C. Cheung at Naval Research Lab <Teddy.Cheung@nrl.navy.mil>
Via
Web form
C.C. Cheung, R. Woolf, M. Kerr, J.E. Grove (NRL), A. Goldstein (USRA), C.A. Wilson-Hodge, D. Kocevski (MSFC), and M.S. Briggs (UAH) report:
The Glowbug gamma-ray telescope [1,2,3], operating on the International Space Station, reports the detection of GRB 260314A, which was also detected by Fermi/GBM (GCN 43997) and GECAM-B (GCN 44008).
Using an adaptive window with a resolution of 32-ms, the burst onset is determined to be 2026-03-14 00:58:49.312 with a duration of 6.1 s and a total significance of about 16.5 sigma. The detection occurred during a time of high background. The light curve comprises a single peak at ~T0+3s.
The analysis results presented here are preliminary and use a response function that lacks a detailed characterization of the surrounding passive structure of the ISS.
Glowbug is a NASA-funded technology demonstrator for sensitive, low-cost gamma-ray transient telescopes developed, built, and operated by the U.S. Naval Research Laboratory (NRL) with support from the University of Alabama in Huntsville, USRA, and NASA MSFC. It was launched on 2023 March 15 aboard the Department of Defense Space Test Program’s STP-H9 to the ISS and operated until 2024 April when it was put in safe storage on orbit. Glowbug was removed from storage and resumed operation on 2025 September 12.
[1] Grove, J.E. et al. 2020, Proc. Yamada Conf. LXXI, arXiv:2009.11959
[2] Woolf, R.S. et al. 2022, Proc. SPIE, 12181, id. 121811O
[3] Woolf, R.S. et al. 2024, Proc. SPIE, 13151, id. 1315108
Distribution Statement A: Approved for public release. Distribution is unlimited.
GCN Circular 44008
Subject
GRB 260314A: GECAM-B observation of a burst
Date
2026-03-15T01:04:49Z (19 days ago)
From
xueyuan zao <zaoxueyuan@gmail.com>
Via
Web form
Xue-Yuan Zao, Chen-Wei Wang, Shao-Lin Xiong (IHEP) report on behalf of GECAM team:
GECAM-B was triggered on-ground by GRB 260314A, at 2026-03-14T00:58:53.100 UTC, which is also detected by Fermi/GBM (Fermi GBM team, GCN #43997).
The GECAM-B light curve can be found here:
https://www.bursthub.cn//admin/static/gecambgrb260314A.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 43999
Subject
Fermi GRB 260314A: Global MASTER-Net observations report
Date
2026-03-14T01:18:37Z (20 days 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-Kislovodsk robotic telescope [1] located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the Fermi GRB 260314A ( Fermi GBM team, GCN 43997) errorbox 83 sec after trigger time at 2026-03-14 01:00:13 UT, with upper limit up to 18.8 mag. The observations began at zenith distance = 28 deg. The sun altitude is -26.8 deg.
The galactic latitude b = 34 deg., longitude l = 92 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=3185241
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________
93 | 2026-03-14 01:00:13 | MASTER-Kislovodsk | (17h 29m 20.27s , +62d 52m 60.0s) | C | 20 | 17.8 |
134 | 2026-03-14 01:00:54 | MASTER-Kislovodsk | (17h 29m 20.09s , +62d 53m 03.0s) | C | 20 | 17.8 |
179 | 2026-03-14 01:01:34 | MASTER-Kislovodsk | (17h 29m 19.85s , +62d 53m 05.9s) | C | 30 | 18.1 |
234 | 2026-03-14 01:02:24 | MASTER-Kislovodsk | (17h 29m 19.53s , +62d 53m 09.3s) | C | 40 | 18.4 |
300 | 2026-03-14 01:03:25 | MASTER-Kislovodsk | (17h 29m 19.14s , +62d 53m 12.2s) | C | 50 | 18.5 |
380 | 2026-03-14 01:04:35 | MASTER-Kislovodsk | (17h 29m 18.64s , +62d 53m 15.1s) | C | 70 | 18.8 |
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 43997
Subject
GRB 260314A: Fermi GBM Final Real-time Localization
Date
2026-03-14T01:09:31Z (20 days 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 00:58:50 UT on 14 Mar 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260314A (trigger 795142735.353478 / 260314041).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 260.2, Dec = 62.9 (J2000 degrees, equivalent to J2000 17h 20m, 62d 53'), with a statistical uncertainty of 8.2 degrees.
The angle from the Fermi LAT boresight is 59.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260314041/quicklook/glg_skymap_all_bn260314041.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/bn260314041/quicklook/glg_healpix_all_bn260314041.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260314041/quicklook/glg_lc_medres34_bn260314041.gif