Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 13145

GRB 120326A: Fermi GBM Observation
2012-03-27T21:47:34Z (12 years ago)
Andrew Collazzi at NASA/MSFC/ORAU <>
Andrew C. Collazzi (NASA/ORAU)
reports on behalf of the Fermi GBM Team:

"At 01:20:31.51 UT on March 26, 2012, the Fermi Gamma-ray Burst Monitor (GBM)
triggered and located GRB 120326A (trigger 354417633 / 120326056) which was
triggered and detected by Swift (Siegel et al., GCN 13105).
The on-ground calculated location, using the Fermi GBM trigger data,
is consistent with the locations seen by Swift.

The GBM light curve shows a single FRED-like event with a 
duration (T90) of about 12 s (50-300 keV). 
The time-averaged spectrum from T0-3.584 to T0+13.824 s
is fit equally well by a Band and Comptonized Power Law function.

For the Band function, the parameters are: 
Epeak = 46.45 +/- 3.67 keV, alpha = -0.98 +/- 0.14, and beta = -2.53 +/- 0.15.
This results in a 1-s peak flux of 3.10 +/- 0.05 ph/s-cm^2 and a
yields a fluence (10-1000 keV) in this time interval 
of (3.539 +/- 0.174)E-06 erg/cm^2.  The C-Stat for this fit is
653.15 over 489 degrees of freedom.

For the Comptonized function, the parameters are: 
Epeak = 55.46 +/- 2.61 keV, and alpha = -1.21 +/- 0.08.
This results in a 1-s peak flux of 3.08 +/- 0.05 ph/s-cm^2.
Which yields a fluence (10-1000 kev) in this time interval of
(3.027 +/- 0.091)E-06 erg/s-cm^2.  The C-Stat for this fit is
654.83 over 490 degrees of freedom.

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