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GCN Circular 35533

Subject
GRB 240112C: Fermi GBM Detection
Date
2024-01-13T16:09:48Z (3 months ago)
From
Peter Veres at University of Alabama in Huntsville <veresp@gmail.com>
Via
Web form
P. Veres (UAH), R. Hamburg (CNRS/IN2P3), A. Myers (NPP/GSFC) and C. Meegan (UAH) report on behalf of
the Fermi Gamma-ray Burst Monitor Team:

"At 17:37:25.12 UT on 12 January 2024, the Fermi Gamma-ray Burst Monitor (GBM)
triggered and located GRB 240112C (trigger 726773850/240112734). GRB 240112C 
was also localized by Swift BAT and XRT (Eyles-Ferris et al., GCN #35522).
The Fermi GBM on-ground Localization is consistent with the Swift position.


The angle from the Fermi LAT boresight is 43 degrees.

The GBM light curve consists of two pulses with a duration (T90)
of about 5.3 s (50-300 keV). The time-averaged spectrum
from T0-0.6 to T0+6.3 s is best fit by
a Band function with with Epeak= 71 +/- 6 keV, alpha = -1.26 +/- 0.08 
and beta = -2.34 +/- 0.10.


The event fluence (10-1000 keV) in this time interval is
(4.8 +/- 0.1)E-06 erg/cm^2. The 1-sec peak photon flux measured
starting from T0-0.064 s in the 10-1000 keV band is 20.2 +/- 0.4 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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