[vsnet-grb-info 28237] GRB 210626A: Fermi GBM observation
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Tue Jun 29 00:26:05 JST 2021
TITLE: GCN CIRCULAR
NUMBER: 30340
SUBJECT: GRB 210626A: Fermi GBM observation
DATE: 21/06/28 15:25:08 GMT
FROM: Andreas von Kienlin at MPE <azk at mpe.mpg.de>
A. von Kienlin (MPE) and C. Meegan (UAH)
report on behalf of the Fermi GBM Team:
"At 08:16:15.99 UT on 26 June 2021, the Fermi Gamma-Ray Burst Monitor (GBM)
triggered and located GRB 210626A (trigger 646388180 / 210626345), which was
also
detected by the Swift/BAT-GUANO (Tohuvavohu et al. 2021, GCN 30325).
The Fermi GBM Final Real-time Localization is consistent with the Swift
position.
The angle from the Fermi LAT boresight at the GBM trigger time is 73
degrees.
The GBM light curve shows a singel pulse with a duration (T90) of
about 34 s (50-300 keV). The time-averaged spectrum from T0-5.632 s
to T0+29.184 s is best fit by a Band function with Epeak= 86 +/- 18 keV,
alpha = -1.21 +/- 0.16 and beta = -2.25 +/- 0.24
The event fluence (10-1000 keV) in this time interval is
(5.1 +/- 0.4)E-06 erg/cm^2. The 1.024-sec peak photon flux measured
starting from T0+5.696 s in the 10-1000 keV band
is 3.40 +/- 0.24 ph/s/cm^2.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog:
https://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html
For Fermi GBM data and info, please visit the official Fermi GBM Support
Page:
https://fermi.gsfc.nasa.gov/ssc/data/access/gbm/"
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