{
  "bibcode": "2015GCN.17541....1H",
  "body": "L. M. Z. Hagen (PSU) and A. Y. Lien (GSFC/UMBC)\nreport on behalf of the Swift/UVOT team:\n\n\nA point source is detected by UVOT that is consistent with the XRT\ncounterpart and 2.5 arcsec from the XMM-Newton source discussed in\nEvans et al. (GCN Circ. 17536).  This source is also seen in archival\nDSS imaging.  It is unclear if this is the same object detected by XRT\nor a serendipitous source.  Given how crowded the field is, it is also\nlikely that the UVOT source is comprised of multiple individual sources.\nThe coordinates of the UVOT source are\n   RA(J2000) = 00:45:14.76 = 11.31150\n   DEC(J2000) = +41:50:35.2 = 41.84311\n\nPreliminary detections and 3-sigma upper limits using the UVOT\nphotometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373)\nfor the available exposures are:\n\nFilter         T_start(s)   T_stop(s)      Exp(s)         Mag\n\nwhite              102         4151          369         19.22+-0.13\nv                  592         4562          216        >18.53\nb                  518         5241           96        >19.08\nu                  261         5177          461         18.60+-0.15\nuvw1               641        79666         5117         18.64+-0.05\nuvm2               617        45953         1237         18.94+-0.13\nuvw2               568         4357          216         18.99+-0.27\n\nThe magnitudes in the table are not corrected for the Galactic\nextinction due to the reddening of E(B-V) = 0.06 in the direction\nof the source (Schlegel et al. 1998).\n\nThis field has also been observed previously by UVOT as part of a\ndifferent observing campaign, primarily in 2013 and 2014. The\nstacked images have the following detections:\n\nFilter      Exp(s)        Mag\n\nv            1406     19.04+-0.19\nb            1445     19.77+-0.15\nu           27521     18.65+-0.03\nuvw1        52236     18.57+-0.02\nuvm2        58908     18.65+-0.03\nuvw2        65719     18.61+-0.02\n\nThese indicate possible variability of the source, but further\nanalysis will be required to confirm this.",
  "circularId": 17541,
  "createdOn": 1425438966000,
  "email": "lea.zernow.hagen@gmail.com",
  "subject": "Trigger 633105 (aka GRB150301C): Swift/UVOT Observations of XRT Counterpart",
  "submitter": "Lea Hagen at PSU  <lea.zernow.hagen@gmail.com>",
  "eventId": "GRB 150301C"
}