General information
GRB 260703A was detected by Fermi/GBM at 02:14:47.19 UT on 2026-07-03 and reported as a likely short GRB. The GBM on-ground position is RA 350.51 deg, Dec 63.36 deg with a statistical uncertainty of 6.72 deg.
Wavelength coverage
- Gamma-ray: Fermi/GBM triggered and localized the event; the angle from the Fermi/LAT boresight was 29 deg.
- Optical: MASTER-OAGH observed the Fermi/GBM error box starting 4712 s after trigger and reported clear-band upper limits ranging up to 18.7 mag.
- X-ray / soft gamma-ray: SVOM/ECLAIRs searched for a signal from EP260703a around the EP-WXT T0 and found no statistically significant signal, with 3-sigma 4-120 keV flux upper limits.
Bands with no observations mentioned: radio, infrared, ultraviolet, neutrino, gravitational-wave.
Lightcurve and spectrum
- Fermi/GBM trigger time: 2026-07-03 02:14:47.19 UT.
- MASTER-OAGH observations span reported mid-times from 4742 s to 7784 s after T0, with 60 s exposures in clear band.
- EP260703a is reported as detected by EP-WXT at 2026-07-03T03:13:57 UTC and lasting about 50 s.
- SVOM/ECLAIRs found no significant signal within T0 +/- 1000 s; for T0 to T0+50 s the 3-sigma upper limit is 2e-8 erg/cm^2/s for photon index 0.22 or 6e-9 erg/cm^2/s for photon index 2.0 in 4-120 keV.
Redshift
What’s special vs typical