Fermi detects GRB 260714B, a long-duration gamma-ray burst with multiple pulses and significant high-energy emission

AI Summary

The Fermi Gamma-ray Burder Monitor (GBM) detected GRB 260714B on 14 July 2026 at 18:23:26.76 UTC, with a duration of ~15.5 sec and multiple emission peaks. Follow-up observations from various instruments including Insight-HXMT/HE, SVOM/GRM, and Konus-Wind confirm the event's characteristics.

Measurements

Notices (2)

Fermi — XRAY · Tue, 14 Jul 2026 18:23:26 GMT

Fermi GBM — GRB · Tue, 14 Jul 2026 18:23:26 GMT

GCN Circulars (10)

GCN-45191 — GRB 260714B · Tue, 21 Jul 2026 15:33:10 GMT
The Konus-Wind satellite detected a long-duration gamma-ray burst, GRB 260714B, on July 26, 2021, at 18:23:26.858 UT. The burst had a total duration of approximately 15.5 seconds and was observed up to 2 MeV, with a total fluence of 3.09 x 10^-5 erg/cm2 and a peak flux of 1.39 x 10^-5 erg/cm2/s in the 20 keV - 10 MeV energy range.

GCN-45188 — GRB 260714B · Sun, 19 Jul 2026 15:10:41 GMT
On July 14, 2026, the Insight-HXMT/HE telescope detected the gamma-ray burst GRB 260714B, which was also observed by multiple other telescopes including Fermi/GBM, AstroSat CZTI, GECAM-B, and SVOM/GRM. The burst exhibited multiple pulses with a duration (T90) of approximately 10.88 seconds and a peak count rate of 8893 counts per second.

GCN-45176 — GRB 260714B · Sat, 18 Jul 2026 05:54:25 GMT
The Space Variable Objects Monitor (SVOM) detected a gamma-ray burst, GRB 260714B, on July 14, 2026, at 18:23:29.900 UTC. This burst, also observed by multiple other telescopes, exhibited multiple pulses with a duration (T90) of 24.0 seconds and a significant energy release, characterized by a power law index and high-energy cutoff.

GCN-45174 — GRB 260714B · Thu, 16 Jul 2026 14:21:30 GMT
The GECAM-B satellite detected a gamma-ray burst, GRB 260714B, on July 14, 2026, at 18:23:32 UTC. This burst, also observed by Fermi/GBM, Fermi/LAT, and AstroSat/CZTI, lasted approximately 21.5 seconds and was characterized by multiple pulses.

GCN-45172 — GRB 260714B · Thu, 16 Jul 2026 06:56:58 GMT
An uncatalogued optical source with magnitudes r = 21.47 ± 0.04 and z = 21.33 ± 0.09, detected by the COLIBRÍ telescope, is a potential optical counterpart of the gamma-ray burst GRB 260714B. Its brightness and color are consistent with GRB afterglows, prompting further photometric and spectroscopic observations.

GCN-45163 — GRB 260714B · Wed, 15 Jul 2026 07:10:34 GMT
A long Gamma-Ray Burst (GRB) designated GRB 260714B was detected by the AstroSat CZTI instrument in the 20-200 keV energy range, with multiple emission peaks and a T90 duration of 10.7 seconds. This event was also detected by Fermi/GBM and Fermi LAT, confirming its significance and providing additional data for analysis.

GCN-45162 — GRB 260714B · Wed, 15 Jul 2026 02:59:59 GMT
On July 14, 2026, at 18:23:26.76 UT, the Fermi-LAT detected high-energy emission from GRB 260714B, which was also observed by Fermi-GBM. The event had a photon flux above 100 MeV of (3.86 ± 0.91)E-5 ph/cm2/s and the highest energy photon detected was 10 GeV.

GCN-45161 — GRB 260714B · Wed, 15 Jul 2026 02:59:10 GMT
On July 14, 2026, the Fermi Gamma-ray Burst Monitor detected a gamma-ray burst (GRB 260714B) with a duration of 12.5 seconds and a peak photon flux of 17.1 ph/s/cm^2. The event was located at RA = 166.40, Dec = 46.66 (J2000) with a statistical uncertainty of 4.01 degrees.

GCN-45160 — GRB 260714B · Tue, 14 Jul 2026 19:00:44 GMT
A gamma-ray burst, GRB 260714B, was detected by the Fermi Gamma-ray Burst Monitor on July 14, 2026, at 18:23:26 GMT. The event was localized to RA(2000.0) = 163.3 deg and Decl.(2000.0) = 47.8 deg with a statistical error radius of 1.5 deg and an additional systematic error of 1 deg.

GCN-45158 — GRB 260714B · Tue, 14 Jul 2026 18:33:58 GMT
The Fermi Gamma-ray Burst Monitor (GBM) detected a likely long gamma-ray burst (GRB 260714B) on July 14, 2026, at 18:23:26 UT. The event was located at RA = 166.4, Dec = 46.7 with a statistical uncertainty of 4.0 degrees.