GRB 260507A
GCN Circular 44630
Subject
GRID detection of GRB 260507A
Date
2026-05-16T01:47:43Z (7 days ago)
Edited On
2026-05-17T22:43:16Z (5 days ago)
From
GRID Student Team at Tsinghua University <grid@tsinghua.edu.cn>
Edited By
Vidushi Sharma at NASA GSFC/UMBC <vidushi.sharma@nasa.gov> on behalf of GRID Student Team at Tsinghua University <grid@tsinghua.edu.cn>
Via
Web form
Longhao Li, Tingkai Sun, Chenyv Wang report on behalf of the GRID Collaboration:
GRID-09 reports the detection of the long-duration GRB 260507A, which was also detected by Fermi GBM (GCN Circular 44493), MASS-Cube (GRID 2.0,GCN Circular 44583).
The event was triggered with GRID on 2026-05-07 at 20:28:00 UTC. The measured burst duration (T90) in the 30-2000 keV range is approximately 12.1 +/- 2.8 seconds.
The GRID light curve of this event can be found at https://mirrors.tuna.tsinghua.edu.cn/GRID/data/GRID-GCN/GRB260507A/GRID_260507A_ltcv.pdf.
GRID is a student-led project to monitor the transient gamma-ray sky with multiple detectors onboard different nanosatellites in the era of multi-messenger astronomy. For more information about GRID, please refer to the following references: https://doi.org/10.1007/s10686-019-09636-w and https://doi.org/10.1007/s10686-021-09819-4.
GCN Circular 44583
Subject
MASS-Cube (GRID 2.0) detection of GRB 260507A
Date
2026-05-12T16:33:06Z (10 days ago)
From
GRID Student Team at Tsinghua University <grid@tsinghua.edu.cn>
Via
Web form
Jiahuan Zhu, Chenyu Wang, Xutao Zheng, Hao Chang, Zirui Yang report on behalf of the MASS-Cube Collaboration:
MASS-Cube reports the detection of the long-duration GRB 260507A, which was also detected by Fermi/GBM (GCN Circular 44493) and GRID-09.
The event was triggered by MASS-Cube on 2026-05-07 at 20:27:59.7 UTC. The measured burst duration (T90) in the 50-10000 keV range is approximately 19.3 +/- 3.2 seconds.
The MASS-Cube light curve of this event can be found at https://mirrors.tuna.tsinghua.edu.cn/GRID/data/GRID-GCN/GRB260507A/MASS_Cube_260507A_ltcv.pdf.
MASS-Cube is a pathfinder for a 3D position-sensitive Compton telescope in space, currently considered the next generation of the GRID constellation in the era of multi-messenger astronomy. For more information about MASS-Cube, please refer to the following reference: https://doi.org/10.1007/s10686-024-09920-4.
GCN Circular 44493
Subject
GRB 260507A: Fermi GBM Final Real-time Localization
Date
2026-05-07T20:38:34Z (15 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 20:28:00 UT on 7 May 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260507A (trigger 799878485.453562 / 260507853).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 287.5, Dec = -21.3 (J2000 degrees, equivalent to J2000 19h 10m, -21d 18'), with a statistical uncertainty of 2.4 degrees.
The angle from the Fermi LAT boresight is 79.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260507853/quicklook/glg_skymap_all_bn260507853.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/bn260507853/quicklook/glg_healpix_all_bn260507853.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260507853/quicklook/glg_lc_medres34_bn260507853.gif