General information
GRB 260714B is a well-confirmed long gamma-ray burst detected at 2026-07-14 18:23:26.76 UT by Fermi-GBM, with a more precise Fermi-LAT localization at RA=163.12 deg, Dec=46.98 deg and 0.11 deg statistical 90% error radius. A COLIBRI uncatalogued optical source at RA=163.2434 deg, Dec=46.8222 deg was reported as a plausible counterpart candidate, but it lies outside the reported LAT error region.
Wavelength coverage
- Gamma-ray / hard X-ray: Fermi-GBM, Fermi-LAT, AstroSat CZTI, GECAM-B, SVOM/GRM, Insight-HXMT/HE, and Konus-Wind all reported detections.
- Optical: COLIBRI/DDRAGO observed at 1.39 to 1.46 days after trigger and detected an uncatalogued source with r=21.47 +/- 0.04 and z=21.33 +/- 0.09 AB.
- X-ray: SVOM/ECLAIRs was outside the field of view and not collecting data at the burst time.
Bands with no observations mentioned: radio, infrared, ultraviolet, neutrino, gravitational-wave.
Lightcurve and spectrum
- Fermi-GBM: single emission episode with multiple peaks, T90 about 12.5 s in 50-300 keV; cutoff power-law fit with index -1.14 +/- 0.01 and Epeak 660 +/- 3 keV.
- Fermi-GBM: fluence (2.51 +/- 0.02)E-05 erg/cm^2 in 10-1000 keV and 1-sec peak photon flux 17.1 +/- 0.3 ph/s/cm^2.
- Fermi-LAT: significant >100 MeV emission from 0-400 s, photon flux (3.86 +/- 0.91)E-5 ph/cm2/s, photon index -2.13 +/- 0.23, and highest-energy photon of 10 GeV at 200 s.
- AstroSat CZTI: multiple peaks in 20-200 keV and 100-500 keV, T90 10.7 +/- 0.2 s in both CZT and Veto cumulative light curves.
- GECAM-B: multiple pulses, T90 21.5 +2.5/-10.0 s in about 70-6000 keV; power-law index -1.69 +0.09/-0.08 and fluence (6.06 +0.64/-0.67)E-06 erg/cm^2.
- SVOM/GRM: multiple pulses, T90 24.0 +4.5/-5.5 s in 15-5000 keV; cutoff power-law Epeak 616 +119/-87 keV for the time-averaged spectrum and 955 +173/-133 keV for the 1 s peak spectrum.
- Insight-HXMT/HE: multiple pulses with T90 10.88 +0.02/-0.04 s, 1 s peak rate 8893 counts/s, and total 36543 counts.
- Konus-Wind: multipeaked light curve lasting about 15.5 s, emission up to 2 MeV, total fluence 3.09(-0.20,+0.23)x10^-5 erg/cm2, and Band-model time-averaged Epeak 595(-44,+55) keV.
Redshift
What’s special vs typical
The event is more notable than a routine GRB because it has a Fermi-LAT detection including a 10 GeV photon, broad prompt coverage across many gamma-ray instruments, and a plausible optical counterpart candidate. The counterpart is not confirmed in the provided text, and no redshift is reported.