{
  "bibcode": "1999GCN...231....1M",
  "body": "S. M. Matz (Northwestern University), G. H. Share, R. Murphy, and J. D.\nKurfess (Naval Research Lab) report on behalf of the OSSE team:\n\nThe OSSE instrument on board the Compton Gamma-Ray Observatory detected\nstrong emission from GRB 990123 in its central detectors and in its\nactive NaI shields. While the burst was not in the detectors' field of\nview, it was still detected to >3 MeV in two 16 s intervals. The rise\nand first strong peak (at about trigger+25 s) are roughly (within 1--2\ns) aligned at all energies. The low-energy (<100 keV) burst emission\nappears to last significantly longer than the higher energy emission.\nDetailed spectral analysis is underway; preliminary analysis indicates\nthat the average spectrum of the main burst can be well described above\n0.8 MeV by a photon power law with an index of about -3.\n\nTime histories from the OSSE central detectors in different energy\nranges from 50 keV to >3 MeV are posted on the OSSE burst web page \n( http://www.astro.nwu.edu/astro/osse/bursts/ ) along with a preliminary\nspectrum of the burst. Also available are a plot and raw data for the\nhigh time resolution (16 ms) history of the first 60 s of the burst\nfrom the triggered OSSE shield data (>100 keV).\n \nThis report may be cited.",
  "circularId": 231,
  "createdOn": 917431064000,
  "email": "s-matz@nwu.edu",
  "subject": "GRB990123, OSSE observations",
  "submitter": "Steven M. Matz at Northwestern U/OSSE  <s-matz@nwu.edu>",
  "eventId": "GRB 990123"
}