{
  "bibcode": "2015GCN.17601....1B",
  "body": "A. A. Breeveld (UCL-MSSL), P. A. Evans (U Leicester),\nH. A. Krimm (CRESST/GSFC/USRA), C. J. Mountford (U Leicester),\nC. Pagani (U Leicester), K. L. Page (U Leicester) and\nD. M. Palmer (LANL) report on behalf of the Swift Team:\n\nAt 10:54:26 UT, the Swift Burst Alert Telescope (BAT) imaged a peak\nwith a projected location near IC 749 (trigger=635306). \nSwift slewed immediately to the location to confirm\nor refute the presence of a source. \nThe BAT on-board calculated location is \nRA, Dec 183.006, +12.037, which is \n  RA(J2000)  =  12h 12m 02s \n  Dec(J2000) = +12d 02' 11\"\nwith an uncertainty of 3 arcmin (radius, 90% containment, including \nsystematic uncertainty).  As is usual for image triggers, there\nis no significant variation in the immediately available BAT lightcurve. \n\nThe XRT began observing the field at 10:56:52.9 UT, 146.3 seconds after\nthe BAT trigger. No source was detected in the 2.5-s promptly available\nimage. We are waiting for the full dataset to detect and localise the\nXRT counterpart. \n\nNo source is detected in the UVOT in the initial images. \n\nBecause this is a low significance peak (5.48 sigma) in\na 64s image made without a rate trigger, it was only\nconsidered to be of possible note because it was\nin the proximity of the nearby galaxy IC 749. \nIt had an offset of 9 arcminutes for this galaxy, which is well \noutside of its luminous region.  In such cases, Swift triggers\na follow-up observation to test whether the source is real. \nIn the absence of an XRT or UVOT confirmation, it is unlikely that\nthis event is anything more than a noise fluctuation. \n\nFull determination of the reality of this event will require\nthe full downlinked dataset.",
  "circularId": 17601,
  "createdOn": 1426677728000,
  "email": "palmer@lanl.gov",
  "subject": "Swift Trigger 635306 is probably not an astrophysical source",
  "submitter": "David Palmer at LANL  <palmer@lanl.gov>"
}