{
  "bibcode": "2010GCN.10448....1W",
  "body": "Colleen Wilson-Hodge (NASA) and Sylvain Guiriec (UAH)\nreport on behalf of the Fermi GBM Team:\n\n\"At 02:38:09.31 UT on 23 February 2010, the Fermi Gamma-Ray Burst Monitor\ntriggered and located GRB 100223A (trigger 288585491 / 100223110).\n\nThe on-ground calculated location, using the GBM trigger\ndata, is RA = 104.1, DEC = +2.8 (J2000 degrees,\nequivalent to 6 h 56 m, 2 d 48 '), with an uncertainty\nof 3.6 degrees (radius, 1-sigma containment,\nstatistical only; there is additionally a systematic\nerror which is currently estimated to be 2 to 3 degrees).\n\nThe angle from the Fermi LAT boresight is 76 degrees.\n\nGBM triggered on a soft peak lasting about 0.05 s followed few ms later by\na longer and harder one. The T90 duration is about 0.206 s (50-300 keV).\nThe time-averaged spectrum from T0-0.01 s to T0+0.22 s is\nadequately fit by a power law function with an exponential\nhigh energy cutoff.  The power law index is -0.31 +/- 0.08 and\nthe cutoff energy, parameterized as Epeak, is 1143 +/- 109 keV\n(Castor C-stat 570.83 for 605 d.o.f.).\n\nThe event fluence (10-1000 keV) in this time interval is\n(1.42 +/- 0.04)E-06 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0-0.01 s in the 10-1000 keV band\nis 12.5 +/- 0.4 ph/s/cm^2.\n\nThe spectral analysis results presented above are preliminary;\nfinal results will be published in the GBM GRB Catalog.\"",
  "circularId": 10448,
  "createdOn": 1266982061000,
  "email": "sylvain.guiriec@lpta.in2p3.fr",
  "subject": "GRB 100223A: Fermi GBM detection",
  "submitter": "Sylvain Guiriec at UAH  <sylvain.guiriec@lpta.in2p3.fr>",
  "eventId": "GRB 100223A"
}