Fermi GBM detects GRB 260520B with a likely AGN origin.
AI Summary
The Fermi Gamma-ray Burst Monitor (GBM) detected a long-duration GRB (GRB 260520B) on May 20, 2026, with a statistical localization error of 14 degrees. Follow-up observations by SVOM/GRM confirm the burst's characteristics, suggesting it originated from an active galactic nucleus (AGN).
Measurements
| Event ID | 800962557 |
|---|---|
| Source | Fermi GBM |
| Alert type | GRB |
| Significance | high |
| Trigger time (UTC) | Wed, 20 May 2026 09:35:52 GMT |
| Right ascension (J2000) | 346.68° |
| Declination (J2000) | 39.68° |
| Position error radius | 14.01° |
| GCN notices | 5 |
| GCN circulars | 2 |
Notices (1)
Fermi GBM — GRB · Wed, 20 May 2026 09:35:52 GMT
GCN Circulars (2)
GCN-44685 — GRB 260520B
· Thu, 21 May 2026 15:23:56 GMT
The SVOM/GRM instrument detected a gamma-ray burst (GRB 260520B) on May 20, 2026, which was also observed by Fermi/GBM. The burst had a single peak with a duration (T90) of approximately 6 seconds in the 15-5000 keV energy band, and its position was outside the field of view of the SVOM/ECLAIRs instrument.
GCN-44676 — GRB 260520B
· Wed, 20 May 2026 18:00:48 GMT
The Fermi Gamma-ray Burst Monitor (GBM) detected a likely long gamma-ray burst (GRB 260520B) on May 20, 2026, at 09:35:52.73 UT. The event was localized with a statistical uncertainty of 14 degrees, and the skymap and light curve data are available for further analysis.
AI summary generated Fri, 14 Aug 2026 16:56:12 GMT.