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GCN Circular 34440

Subject
GRB 230815A: Fermi GBM detection
Date
2023-08-15T20:38:44Z (8 months ago)
From
Bagrat Mailyan at Florida Tech <mbagrat@gmail.com>
Via
Web form
B. Mailyan (Florida tech), A. von Kienlin (MPE) and C. Meegan (UAH) report on behalf of
the Fermi Gamma-ray Burst Monitor Team:

"At 10:49:54.66 UT on 15 August 2023, the Fermi Gamma-ray Burst Monitor (GBM)
triggered and located GRB 230815A (trigger 713789399/230815451).
which was also detected by Swift BAT (N. J. Klingler et al. 2023, GCN 34434).
The Fermi GBM on-ground location is consistent with the Swift BAT position.

The angle from the Fermi LAT boresight is 159 degrees.

The GBM light curve consists of a single emission episode with a duration (T90)
of about 5.2 s (50-300 keV). The time-averaged spectrum
from T0+0.002 to T0+3.264 s is best fit by
a Band function with Epeak = 235 +/- 25 keV,
alpha = -0.6 +/- 0.1, and beta = -2.22 +/- 0.09.

The event fluence (10-1000 keV) in this time interval is
(1.20 +/- 0.03)E-05 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+1.1 s in the 10-1000 keV band is 27 +/- 2 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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