GCN Circular 9251
Subject
GRB 090423: Fermi GBM observation (correction of isotropic equivalent energy)
Event
Date
2009-04-25T20:05:22Z (17 years ago)
From
Andreas von Kienlin at MPE <azk@mpe.mpg.de>
A. von Kienlin (MPE) reports on behalf of the Fermi GBM Team:
"The isotropic equivalent energy of GRB 090423 given in
GCN Circular 9229 has been erroneously computed.
At a redshift of about 8 the correct value for the isotropic
equivalent energy is E_iso = (1.0 +/- 0.3)E+53 ergs.
This value was determined from the observed event fluence of
(1.1 +/- 0.3)E-06 erg/cm^2 in the 8 to 1000 keV energy range
(observer's frame!).
We apologize for this mistake."