TITLE:   GCN CIRCULAR
NUMBER:  35754
SUBJECT: GRB 240215A: Fermi GBM Observation
DATE:    24/02/18 23:32:17 GMT
FROM:    Lorenzo Scotton at UAH <lscottongcn@outlook.com>

L. Scotton (UAH) and C. Meegan (UAH) report on behalf of
the Fermi Gamma-ray Burst Monitor Team:

"At 15:33:00.41 UT on 15 February 2024, the Fermi Gamma-ray Burst Monitor (GBM)
triggered and located GRB 240215A (trigger 729703985/240215648),
which was also detected by Swift/BAT-GUANO (J. DeLaunay et al. 2024, GCN 35733).
The Fermi GBM on-ground location is consistent with the Swift/BAT-GUANO position.

The angle from the Fermi LAT boresight is 67 degrees.

The GBM light curve consists of a pulse followed by weak emission with a duration (T90)
of about 57 s (50-300 keV). The time-averaged spectrum
from T0-4.1 to T0+60.4 s is best fit by
a simple power law function with index -1.77 +/- 0.06.

The event fluence (10-1000 keV) in this time interval is
(3.6 +/- 0.3)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 1.9 +/- 0.2 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/"