General information
GRB 260730B is reported as a bright, long-duration gamma-ray burst detected in prompt emission by NuSTAR SINGS and AstroSat CZTI, with an additional mention that it was also detected by SVOM-GRM notices.
Wavelength coverage
- Gamma-ray / hard X-ray: NuSTAR detected prompt emission in CsI anti-coincidence shields and a signal above 100 keV in CZT detectors; AstroSat CZTI detected the burst in 20-200 keV CZT data and 100-500 keV CsI Veto data.
Bands with no observations mentioned: optical, near-infrared, ultraviolet, soft X-ray afterglow, radio, neutrino, gravitational wave.
Lightcurve and spectrum
- NuSTAR: single episode with two peaks lasting about 25 s; peak count rate ~3500 cps against a ~1000 cps baseline.
- AstroSat CZTI CZT 20-200 keV: multiple peaks, strongest at 2026-07-30 13:13:56.216 UTC; peak count rate 1201 (+58, -66) counts/s above background; total 8451 (+206, -277) counts; background 243 (+3, -3) counts/s; T90 = 16.0 (+0.3, -0.3) s.
- AstroSat CZTI Veto 100-500 keV: multiple peaks, strongest at 2026-07-30 13:13:55.471 UTC; peak count rate 2594 (+88, -100) counts/s above background; total 15878 (+327, -466) counts; background 715 (+5, -5) counts/s; T90 = 15.6 (+0.4, -0.3) s.
Redshift
What’s special vs typical