GRB 260414A
GCN Circular 44320
Subject
GRB 260414A: Insight-HXMT/HE detection
Date
2026-04-17T05:57:10Z (8 days ago)
From
guohx@ihep.ac.cn
Via
Web form
Hao-Xuan Guo, Chen-Wei Wang, Cheng-Kui Li, Shao-Lin Xiong, and Chao Zheng (IHEP) report on behalf of the Insight-HXMT team:
At 2026-04-14T06:32:07.400 (T0), Insight-HXMT/HE detected a long burst, GRB 260414A, which is also detected by Fermi/GBM (Fermi GBM Team, GCN #44293) and Glowbug (C.C. Cheung et al., GCN #44297).
The Insight-HXMT/HE light curve mainly consists of multiple pulses with a total duration (T90) of 34.5 +7/-11 s. The 1s peak rate, measured from T0+0.25 s, is 818 cnts/sec. Insight-HXMT/HE detected a total of 6318 counts from this burst.
The Insight-HXMT /HE light curve can be found here:
https://www.bursthub.cn//admin/static/hxmtgrb260414A.png
All measurements above are made with the CsI detectors of Insight-HXMT/HE operating in the regular mode with the energy range of about 60-900 keV (deposited energy). Only gamma-rays with energy greater than about 200 keV can penetrate the spacecraft and leave signals in the CsI detectors installed inside of the telescope.
Insight-HXMT is the first Chinese space X-ray telescope, which was funded jointly by the China National Space Administration (CNSA) and the Chinese Academy of Sciences (CAS). More information about it could be found at: http://hxmten.ihep.ac.cn/
GCN Circular 44297
Subject
GRB 260414A: Glowbug gamma-ray detection
Date
2026-04-14T23:14:50Z (10 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 260414A, which was detected by Fermi/GBM (GCN 44293).
Using an adaptive window with a resolution of 32-ms, the burst onset is determined to be 2026-04-14 06:31:55.248 with a duration of 21.5 s and a total significance of about 21 sigma. The detection occurred during a time of high background as Glowbug was entering the northern radiation belt. The brightest peaks in the light curve are at ~T0+3.5s and ~T0+12.5s.
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 44293
Subject
GRB 260414A: Fermi GBM Final Real-time Localization
Date
2026-04-14T06:42:26Z (11 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 06:31:55 UT on 14 Apr 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260414A (trigger 797841120.53845 / 260414272).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 17.0, Dec = 39.8 (J2000 degrees, equivalent to J2000 01h 07m, 39d 47'), with a statistical uncertainty of 6.0 degrees.
The angle from the Fermi LAT boresight is 48.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260414272/quicklook/glg_skymap_all_bn260414272.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/bn260414272/quicklook/glg_healpix_all_bn260414272.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260414272/quicklook/glg_lc_medres34_bn260414272.gif