General information
GRB 260407A is reported as a likely long GRB, first triggered by Fermi/GBM at 2026-04-07 09:11:07 UT with a GBM real-time localization around RA=71.4 deg, Dec=28.2 deg (J2000) and 2.1 deg statistical uncertainty. The burst is independently detected in gamma-rays by Glowbug, CALET/CGBM, Insight-HXMT/HE, GECAM-A, and TERI.
Wavelength coverage
- Gamma-ray: Detected by Fermi/GBM, Glowbug, CALET/CGBM, Insight-HXMT/HE, GECAM-A, and TERI.
No observations were mentioned in X-ray, UV, optical/IR, radio, gravitational waves, or neutrinos.
Lightcurve and spectrum
- Glowbug: onset 2026-04-07 09:11:06.112; duration 4.1 s (adaptive 32 ms window); total significance ~9.6 sigma; single peak; possible low-significance extended/precursor emission.
- CALET/CGBM: single pulse starting at T-0.5 s, peaking at T+1.6 s, ending at T+27.1 s; T90=22.6 +/- 5.0 s and T50=7.0 +/- 1.0 s (40–1000 keV).
- Insight-HXMT/HE: single pulse; T90=23.5 (+16/-9) s; 1 s peak rate 493 cnt/s (from T0+0.25 s); total 4651 counts.
- GECAM-A: single pulse; T90=19.5 (+4.5/-6.5) s (40–6000 keV).
- TERI: one peak at T0+1.5 s with peak excess count rate 45 above 133 cps baseline (1 Hz binning).
Redshift
What’s special vs typical