A transient event detected by GRM with medium significance but unknown origin.

AI Summary

The GRM instrument on board GEOLEO satellite detected a transient event with a signal-to-noise ratio of 5.6 between 51.24 keV and 264.72 keV energy bounds. No GCN circulars have been issued yet, indicating further investigation is needed.

Notices (1)

SVOM — GRB · Mon, 16 Mar 2026 17:12:53 GMT

GCN Circulars (5)

GCN-44046 — GRB 260316A · Wed, 18 Mar 2026 12:06:23 GMT
A team of astronomers led by Francis Fortin (IRAP) conducted optical follow-up observations of the GRB 260316A / EP260316a gamma-ray burst using the DDRAGO imager on the COLIBRÍ telescope. They detected an optical counterpart candidate and found no significant variability between two epochs. The team thanks various institutions and observatories for their support.

GCN-44040 — GRB 260316A · Tue, 17 Mar 2026 15:46:38 GMT
GRB 260316A was detected by the Gravitational wave high-energy Electromagnetic Counterpart All-sky Monitor (GECAM) at 2026-03-16T17:12:53.100 UTC. The burst, also detected by Fermi/GBM and SVOM, consisted of a single pulse with a duration (T90) of 2.2 seconds. The GECAM-B light curve is available at <https://www.bursthub.cn//admin/static/gecambgrb260316A.png>. GECAM is a Chinese mission consisting of three micro-satellites, GECAM-A, GECAM-B, and GECAM-C.

GCN-44039 — GRB 260316A · Tue, 17 Mar 2026 15:43:47 GMT
GRB 260316A was detected by the Space Variable Objects Monitor (SVOM)/GRM, triggering an in-flight observation. The burst consisted of a single pulse with a duration of approximately 1.6 seconds and a fluence of 3.21e-06 erg/cm^2 in the 10-1000 keV energy range. The position of the burst, determined by Fermi/GBM, was outside the SVOM/ECLAIRs field of view. The time-averaged spectrum was best fitted by a power law function with a power law index of -2.23.

GCN-44038 — GRB 260316A · Tue, 17 Mar 2026 15:21:28 GMT
The Space Variable Objects Monitor (SVOM) team reports non-detection of an optical source associated with GRB 260316A in their ToO observation using the SVOM/VT telescope. The team obtained 3-sigma upper limits of >23.2 mag in the VT_R band and >23.3 mag in the VT_B band, 10.35 hours post trigger.

GCN-44035 — GRB 260316A · Tue, 17 Mar 2026 09:51:41 GMT
Astronomers using the AstroSat CZTI collaboration detected a gamma-ray burst (GRB 260316A) in the 20-200 keV energy range. The burst, also detected by Fermi GBM, Calet, and SVOM, peaked at 17:12:53.75 UTC with a peak count rate of 524 counts/s above the background. The source was faintly detected in the CsI anticoincidence detector in the 100-500 keV energy range.