General information
GRB 260424B is a likely short GRB detected by multiple gamma-ray instruments (SVOM/GRM, Konus-Wind, Fermi/GBM, Mars-Odyssey/HEND via IPN, Glowbug, and AstroSat/CZTI). An IPN triangulation provides a small 3-sigma error box centered at RA=348.155 deg, Dec=+41.208 deg.
Wavelength coverage
- Gamma-ray: SVOM/GRM trigger and T90 reported; Konus-Wind prompt fluence/peak flux and spectral fit; Fermi/GBM localization; Glowbug and AstroSat/CZTI detections.
- Optical: COLIBRÍ/DDRAGO i- and z-band imaging at ~3.8 days gives upper limits with no new source detected in the IPN region.
No observations were mentioned in X-ray, UV, IR, radio, or TeV bands.
Lightcurve and spectrum
- SVOM/GRM: weak soft precursor followed by main emission; T90 = 1.4 (+0.6/-0.5) s (15–5000 keV).
- Konus-Wind: multipeaked structure; total duration ~0.6 s; emission up to ~3 MeV; fluence 3.02(-0.30,+0.33)×10^-6 erg/cm^2 (20 keV–10 MeV); 16-ms peak flux 1.89(-0.35,+0.38)×10^-5 erg/cm^2/s.
- Konus-Wind spectrum (T0 to T0+0.256 s): cutoff power-law with alpha = -0.67(-0.14,+0.16), Ep = 756(-131,+170) keV; Band fit consistent with beta < -2.0.
- Glowbug: onset 2026-04-24 23:37:24.0; duration ~0.6 s; double-peaked structure.
- AstroSat/CZTI: veto (100–500 keV) peak at 23:37:24.97 UTC; peak count rate 646 (+75, -82) counts/s above background; T90 not estimated due to 1 s binning.
- COLIBRÍ: no optical transient detected to i>22.6, z>21.9 (5-sigma, AB) at ~3.8 days.
Redshift
What’s special vs typical