{
  "createdOn": 1682607814352,
  "eventId": "GRB 230426A",
  "body": "J. Wood (NASA/MSFC) and C. Meegan (UAH) report on behalf of\nthe Fermi Gamma-ray Burst Monitor Team:\n\n\"At 20:28:59.97 UT on 26 April 2023, the Fermi Gamma-ray Burst Monitor (GBM)\ntriggered and located GRB 230426A (trigger 704233744/230426853)\nwhich was also detected by AstroSat CZTI (P K. Navaneeth et al. 2023, GCN 33686).\n\nThe on-ground calculated location, using the Fermi GBM trigger data,\nis RA = 38.53, Dec = -82.40 (J2000 degrees, equivalent to\nJ2000 2h 34m, -82d 24'), with a statistical uncertainty of 1.00 degrees.\n(radius, 1-sigma containment, statistical only; there is additionally a\nsystematic error which we have characterized as a mixture of two Gaussians,\none with a radius of 1.8 degrees (52% contribution) and one with a radius\nof 4.1 degrees (47% contribution) [A. Goldstein et al. 2020, ApJ, 895, 1]).\n\nThe angle from the Fermi LAT boresight is 49 degrees.\n\nThe GBM light curve consists of multiple pulses with a duration (T90)\nof about 25.9 s (50-300 keV). The time-averaged spectrum\nfrom T0+8.2 to T0+35.8 s is best fit by\na Band function with Epeak = 77 +/- 2 keV,\nalpha = -1.34 +/- 0.02, and beta = -2.38 +/- 0.03.\n\nThe event fluence (10-1000 keV) in this time interval is\n(5.21 +/- 0.04)E-05 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0+23 s in the 10-1000 keV band is 66.6 +/- 0.7 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\n\n",
  "submitter": "Joshua Wood at NASA/MSFC <joshua.r.wood@nasa.gov>",
  "subject": "GRB 230426A: Fermi GBM Detection",
  "circularId": 33689,
  "bibcode": "2023GCN.33689....1W"
}