{
  "subject": "GRB 250327A: Fermi GBM observation",
  "createdOn": 1743087120568,
  "eventId": "GRB 250327A",
  "submitter": "Andreas von Kienlin at MPE <azk@mpe.mpg.de>",
  "body": "A. von Kienlin (MPE) reports on behalf of the Fermi GBM Team:\n\n\"At 07:30:06.33 UT on 27 March 2025, the Fermi Gamma-Ray Burst Monitor (GBM)\ntriggered and located GRB 250327A (trigger 764753411 / 250327313), which was\nalso detected by the Swift/BAT (Parsotan et al. 2025, GCN 39877). The Fermi\nGBM Final Real-time Localization (GCN 39876) is consistent with the Swift position.\n\nThe angle from the Fermi LAT boresight at the GBM trigger time is 47 degrees.\n\nThe GBM light curve shows a structured emission episode\nwith a duration (T90) of about 160 s (50-300 keV).\nThe time-averaged spectrum from T0-1.024s to T0+90.114s is\nbest fit by a Band function with Epeak = 480 +/- 50 keV,\nalpha = -1.08 +/- 0.03, and beta = -2.14 +/- 0.15.\n\nThe event fluence (10-1000 keV) in this time interval is\n(2.97 +/- 0.07)E-05 erg/cm^2. The 1.024-sec peak photon flux measured\nstarting from T0+0.704 s in the 10-1000 keV band\nis 5.08 +/- 0.23 ph/s/cm^2.\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/\"\n",
  "bibcode": "2025GCN.39882....1V",
  "submittedHow": "email",
  "circularId": 39882
}