{
  "body": "E. Bissaldi (Politecnico and INFN Bari) and C. Meegan (UAH)\nreport on behalf of the Fermi GBM Team:\n\n\"At 06:45:50.21 UT on 06 March 2024, the Fermi Gamma-Ray Burst Monitor (GBM)\ntriggered and located GRB 240306A (trigger 731400355 / 240306282),\nwhich was also detected by the Swift/BAT GUANO (Parsotan et al. 2024, GCN 35889),\nAstroSat CZTI (Joshi et al. 2024, GCN 35892) and INTEGRAL SPI-ACS (trigger 10616).\n\nThe GBM localization was reported in an earlier GCN (Fermi GBM Team, GCN 35885).\n\nThe angle from the Fermi LAT boresight at the GBM trigger time is 87 degrees.\n\nThe GBM light curve consists of single pulse \nwith a duration (T90) of about 9 s (50-300 keV).\nThe time-averaged spectrum from T0-1.7 s to T0+7.7 s is\nbest fit by a power law function with an exponential\nhigh-energy cutoff. The power law index is -1.16 +/- 0.07 and\nthe cutoff energy, parameterized as Epeak, is 135 +/- 12 keV.\n\nThe event fluence (10-1000 keV) in this time interval is\n(3.15 +/- 0.14)E-06 erg/cm^2. The 1-sec peak photon flux \nmeasured starting from T0+0.6 s in the 10-1000 keV band\nis 6.8 +/- 0.3 ph/s/cm^2.\n\n\nThe spectral analysis results presented above are preliminary;\nfinal results will be published in the GBM GRB Catalog:\nhttps://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html\n\nFor Fermi GBM data and info, please visit the official Fermi GBM Support Page:\nhttps://fermi.gsfc.nasa.gov/ssc/data/access/gbm/\"",
  "submittedHow": "web",
  "createdOn": 1709826820893,
  "circularId": 35899,
  "subject": "GRB 240306A: Fermi GBM observation",
  "submitter": "Elisabetta Bissaldi at Politecnico and INFN Bari <elisabetta.bissaldi@ba.infn.it>",
  "bibcode": "2024GCN.35899....1B",
  "eventId": "GRB 240306A"
}