TITLE:   GCN CIRCULAR
NUMBER:  36382
SUBJECT: GRB 240502A: Fermi GBM Observation
DATE:    24/05/03 13:36:05 GMT
FROM:    Cuán de Barra at UCD <cuan.debarra@ucdconnect.ie>

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

At 05:28:41.88 UT on 02 May 2024, the Fermi Gamma-ray Burst Monitor (GBM)
triggered and located GRB 240502A (trigger 736320526/240502228)
which was also detected by INTEGRAL (S.Mereghetti et al. 2024, GCN 36369).

The Fermi GBM Final Position location (Fermi GBM Team 2024, GCN 36368) is consistent with the INTEGRAL position.
The angle from the Fermi LAT boresight is 89.0 degrees

The GBM light curve contains a single emission episode with a duration (T90)
of about 23 s (50-300 keV). The time-averaged spectrum from T0-4.1 to T0+20.5 s
is best fit by is best fit by a Comptonized Epeak function with Epeak = 151.20 +/- 21.40 keV,
and alpha = 1.56 +/- 1.10

The event fluence (10-1000 keV) in this time interval is (1.3 +/- 0.2)E-06 erg/cm^2. 
The 1-sec peak photon flux measured starting from T0+0.38 s in the 10-1000 keV band is 0.9 +/- 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/