General information
GRB 260623B was detected by Konus-Wind at about 02:54:05 UT and is reported to coincide in time and position with EP260623a, supporting a common origin. The circular classifies it as a long-duration GRB and reports a roughly 10 sigma count-rate increase.
Wavelength coverage
- Gamma-ray: Konus-Wind detected the burst in the 20-300 keV band and reports fluence and peak flux in the 20 keV-1500 keV range.
- X-ray: EP-WXT detection of EP260623a is mentioned as temporally overlapping and positionally consistent with the Konus-Wind event.
No optical, radio, neutrino, or gravitational-wave observations are mentioned.
Lightcurve and spectrum
- The Konus-Wind Bayesian block interval spans T0-259 s to T0+327 s.
- Total fluence is 8.2(-1.2,+1.2)x10^-6 erg/cm^2 in 20 keV-1500 keV.
- The 2.944 s peak energy flux from T0+3.366 s is 0.7(-0.3,+0.4)x10^-7 erg/cm^2/s in 20 keV-1500 keV.
- The time-integrated spectrum from T0-258.650 s to T0+327.206 s is described by a CPL model with alpha > -1.16 and Ep = 76(-8,+28) keV.
- The spectrum near maximum count rate from T0-2.522 s to T0+38.694 s is described by a CPL model with alpha > -1.42 and Ep = 87(-15,+83) keV.
Redshift
A redshift z=0.703 is assumed, attributed in the circular to Izzo et al. The provided text does not specify the redshift measurement method; using this redshift, Konus-Wind estimates E_iso = 1.13(-0.16,+0.24)x10^52 erg, L_iso = 1.71(-0.72,+0.97)x10^50 erg/s, Ep,i,z = 130(-14,+47) keV, and Ep,p,z = 148(-26,+143) keV.
What’s special vs typical