{
  "bibcode": "2005GCN..4357....1H",
  "body": "S.T. Holland (GSFC/USRA), S. Barthelmy (GSFC), A. Beardmore (U Leicester),\nD. Burrows (PSU), M. Capalbi (ASDC), G. Chincarini (OAB),\nS. Covino (OAB), N. Gehrels (GSFC), O. Godet (U. Leicester),\nC. Gronwall (PSU), S. Hunsberger (PSU), J. Kennea (PSU),\nH. Krimm (GSFC/USRA), A. Moretti (OAB), K. Page (U Leicester),\nD. Palmer (LANL), M. Perri (ASDC), G. Tagliaferri (OAB)\non behalf of the Swift team:\n\nAt 11:21:52 UT, Swift-BAT triggered on hard x-ray emission from probably\na non-GRB source (trigger=172969).  The spacecraft slewed immediately.\nThe BAT on-board calculated location is RA,Dec 358.776d,+28.607d\n{23h 55m 06s,+28d 36' 26\"} (J2000), with an uncertainty of 3 arcmin\n(radius, 90% containment, stat+sys).  This is an image trigger (64-sec duration)\nand the TDRSS lightcurve shows no obvious variation as is typical for\nimage triggers.  We also note that the RS CVn star II Peg is close,  and\nis probably the cause of the BAT and XRT detections.\n\nXRT began observing the field at 11:24:08 UT, 136 seconds after the BAT\ntrigger.  On-board centroiding found a bright X-ray\nsource in the field of view at the following coordinates:\nRA(J2000) = 23 55 04.6\nDec(J2000)= 28 38 02\nWe estimate the uncertainty of this position to be 6 arcseconds (radius,\n90% containment).  This position lies 99 arcseconds from the BAT position\nabove.  The approximate initial flux is 6.4e-09 erg/cm2/sec (0.2-10 keV).\nWe note that the XRT count rate is not decreasing and that this position is \n7 arcseconds from the RS CVn star II Peg.  It is likely that the XRT \ncentroided on this star.  There is no other X-ray source in the 2 x 2 arcmin\npostage stamp image.  A check for other sources in the BAT error circle\nwill require ground analysis following the next Malindi contact.\n\nUVOT began observing the field at UT 11:24:12, 140 seconds after the BAT\ntrigger.  II Peg is seen as a bright source.  No new source with respect \nto the DSS is seen in the 200 sec finding chart image to a limiting \nmagnitude of V=18.6.  The finding chart covers 12% of the BAT error circle.\nThere is also no new source seen in the parameterized source list.",
  "circularId": 4357,
  "createdOn": 1134736025000,
  "email": "Scott@lheamail.gsfc.nasa.gov",
  "subject": "Swift detection of an RS CVn flare star",
  "submitter": "Scott Barthelmy at NASA/GSFC  <Scott@lheamail.gsfc.nasa.gov>"
}