Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to
Introducing Einstein Probe, Astro Flavored Markdown, and Notices Schema v4.0.0. See news and announcements

GCN Circular 9579

GRB 090626: Fermi GBM detection
2009-06-26T11:26:22Z (15 years ago)
Andreas von Kienlin at MPE <>
A. von Kienlin (MPE) reports on behalf of the Fermi GBM Team: 

"At 04:32:08.88  UT on 26 June 2009, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 090626 (trigger 267683530  / 090626189).
The on-ground calculated location, using the GBM trigger data,
is RA = 169.3, DEC = -36.1 (J2000 degrees, equivalent to 11h 17m, -36d 06'),

with a statistical uncertainty of less than 1 degree 
(radius, 1-sigma containment) and an additional systematic error which 
is currently estimated to be 2 to 3 degrees. 
The angle from the Fermi LAT boresight is 15 degrees.

This burst was also independently detected by INTEGRAL SPI-ACS.

The GBM light curve consists of four main peaks with a duration (T90) 
of about 70 s (8-1000 keV). The time-averaged spectrum from 
T0-0.256 s to T0+69.377 s is best fit by a Band function with 
Epeak = 175 +/- 12 keV, alpha = -1.29 +/- 0.02, and 
beta = -1.98 +/- 0.02 (chi squared 578 for 477 d.o.f.).

The event fluence (8-1000 keV) in this time interval is 
(3.5 +/- 0.1)E-05 erg/cm^2. The 1.024-sec peak photon flux measured 
starting from T0+1.024 s in the 8-1000 keV band 
is 17.9 +/- 1.4 ph/s/cm^2.

The spectral analysis results presented above are preliminary; 
final results will be published in the GBM GRB Catalog."
Looking for U.S. government information and services? Visit