GCN Circular 9416
Subject
GRB 090423: Fermi GBM T90 follow-up analysis results
Date
2009-05-21T14:26:47Z (16 years ago)
From
Andreas von Kienlin at MPE <azk@mpe.mpg.de>
A. von Kienlin (MPE), C. Kouveliotou (NASA/MSFC) and V. Connaughton (UAH)
report on behalf of the Fermi GBM Team:
"We performed a detailed follow-up analysis of the T90 of the high redshift
GRB 090423 (H. Krimm et al., GCN Circ. # 9198) to determine the nature of
the extended pulse centered at T+30s as reported earlier (A. von Kienlin,
GCN # 9229). Due to the low significance of the detection, we were not able
to accurately locate this later pulse (the emission was only significantly
seen with one of the two triggered detectors). We conclude, therefore, that
this pulse is most probably due to background fluctuations.
The final GBM T90 derived between 10-300 keV is 11.5 +/- 2.0 sec. This
duration agrees within the error with the value of 10.3 +/- 1.1 sec reported
by the Swift team (H. Krimm et al., GCN Report 211.2)"