TITLE: GCN CIRCULAR NUMBER: 36717 SUBJECT: GRB 230619A: Fermi GBM Observation DATE: 24/06/21 01:21:25 GMT FROM: Sarah Dalessi at UAH sd0104@uah.edu
S. Dalessi (UAH) and C. Meegan (UAH) report on behalf of the Fermi Gamma-ray Burst Monitor Team:
"At 03:43:31.00 UT on 19 June 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240619A (trigger 740461416/240619155), which was also detected by the Gravitational-wave Optical Transient Observer (GOTO) (Gompertz et al. 2024, GCN 36715). The Fermi-GBM Final Real-time location (Fermi GBM Team 2024, GCN 36694) is consistent with the GOTO position.
The angle from the Fermi LAT boresight is 63 degrees.
The GBM light curve two emission episodes with a duration (T90) of about 36.1 s (50-300 keV). The time-averaged spectrum from T0+0.002 to T0+36.129 s is best fit by a Band function with Epeak = 110 +/- 50 keV, alpha = -1.3 +/- 0.2, and beta = -1.70 +/- 0.04.
The event fluence (10-1000 keV) in this time interval is (1.19 +/- 0.03)E-05 erg/cm^2. The 1-sec peak photon flux measured starting from T0+0.096 s in the 10-1000 keV band is 19.1 +/- 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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