Fermi GBM detects short GRB 260308A with multiple pulses and a T90 of 0.3 seconds.
AI Summary
GRB 260308A was detected by Fermi GBM, Insight-HXMT, and SVOM, exhibiting a T90 duration of 0.3 seconds and peak count rates up to 625 counts per second. Follow-up observations indicate a complex light curve with multiple pulses.
Measurements
| Event ID | GBM_794693157 |
|---|---|
| Source | Fermi GBM |
| Alert type | GRB |
| Significance | high |
| Trigger time (UTC) | Sun, 08 Mar 2026 20:05:52 GMT |
| Right ascension (J2000) | 302.5333° |
| Declination (J2000) | -56.2° |
| Position error radius | 8.1167° |
| GCN notices | 4 |
| GCN circulars | 3 |
Notices (1)
Fermi GBM — GRB · Sun, 08 Mar 2026 20:05:52 GMT
GCN Circulars (3)
GCN-43983 — GRB 260308A
· Fri, 13 Mar 2026 11:02:02 GMT
On March 8, 2026, the Insight-HXMT team detected a gamma-ray burst (GRB 260308A) using the CsI detectors onboard the Insight-HXMT spacecraft. The burst, also detected by Fermi/GBM and SVOM/GRM, had a T90 duration of 0.3 seconds and a peak count rate of 625 counts per second. The Insight-HXMT team detected a total of 512 counts from the burst, which occurred in the energy range of about 60-900 keV. Insight-HXMT is the first Chinese space X-ray telescope, funded by the China National Space Administration and the Chinese Academy of Sciences.
GCN-43960 — GRB 260308A
· Wed, 11 Mar 2026 14:33:12 GMT
The Space Variable Objects Monitor (SVOM) detected a short gamma-ray burst (GRB 260308A) on March 8, 2026, with a duration of 1.5 seconds and a peak energy of 643 keV. The burst was located outside the field of view of the ECLAIRs instrument on SVOM but was detected by the GRM instrument. The light curve showed multiple pulses, and the time-averaged spectrum was best fitted by a power law function with an exponential high-energy cutoff.
GCN-43949 — GRB 260308A
· Sun, 08 Mar 2026 20:16:13 GMT
The Fermi Gamma-ray Burst Monitor (GBM) has detected a Short Gamma-ray Burst (GRB), designated as GRB 260308A, at approximately 20:05:52 UT on March 8, 2026. The event triggered the Fermi GBM and was localized to a region in the sky with a statistical uncertainty of 3.6 degrees, RA = 250.2, Dec = -32.6 (J2000). The angle from the Fermi Large Area Telescope (LAT) boresight is 108.0 degrees. The Fermi team has provided the skymap, HEALPix FITS file, and light curve for further analysis.
AI summary generated Tue, 28 Jul 2026 16:24:56 GMT.