{
  "bibcode": "2008GCN..8371....1V",
  "body": "L. Vetere (PSU), S. D. Barthelmy (GSFC),\nA. P. Beardmore (U Leicester), D. N. Burrows (PSU),\nP.A. Curran (MSSL-UCL), N. Gehrels (NASA/GSFC),\nC. Guidorzi (INAF-OAB), S. T. Holland (CRESST/USRA/GSFC),\nE. A. Hoversten (PSU), J. A. Kennea (PSU),\nH. A. Krimm (CRESST/GSFC/USRA), N. P. M. Kuin (MSSL),\nD. M. Palmer (LANL), J. L. Racusin (PSU), T. Sakamoto (NASA/UMBC) and\nH. Ziaeepour (UCL-MSSL) report on behalf of the Swift Team:\n\nAt 21:19:00 UT, the Swift Burst Alert Telescope (BAT) triggered and\nlocated a flare from Algol (trigger=331592).  Swift slewed immediately\nto the location.  The BAT on-board calculated location is \nRA, Dec 47.029, +40.951, which is \n   RA(J2000)  =  03h 08m 07s\n   Dec(J2000) = +40d 57' 05\"\nwith an uncertainty of 3 arcmin (radius, 90% containment, including \nsystematic uncertainty).  As is typical for image triggers,\nthe TDRSS BAT light curve does not show anything significant. \n\nThe XRT began observing the field at 21:21:07.4 UT, 126.6 seconds after\nthe BAT trigger. XRT found a very bright X-ray source located at RA, Dec\n47.0437, +40.9542 which is equivalent to:\n   RA(J2000)  = 03h 08m 10.48s\n   Dec(J2000) = +40d 57' 15.1\"\nwith an uncertainty of 6.2 arcseconds (radius, 90% containment). This position\nis 6.6 arcseconds from Algol.  The prompt raw spectrum shows evidence for \na bright Fe line.  Due to the optical brightness of Algol the XRT data suffer\nfrom severe optical loading and care must be exercised in analyzing these \ndata. \n\nBecause Algol is a 2nd magnitude star it is too bright to be observed\nwith UVOT.  No data will be taken.",
  "circularId": 8371,
  "createdOn": 1223934156000,
  "email": "scott@lheamail.gsfc.nasa.gov",
  "subject": "Swift-BAT triggered on the flare star Algol",
  "submitter": "Scott Barthelmy at NASA/GSFC  <scott@lheamail.gsfc.nasa.gov>"
}