{
  "bibcode": "2015GCN.17547....1S",
  "body": "M. H. Siegel, L.M.Z. Hagen (PSU) and A. Y. Lien (GSFC/UMBC)\nreport on behalf of the Swift UVOT team:\n\nSwift continues to observe the field of BAT trigger 633105 (formerly\nGRB 150301C, now Swift J0045.2+4151) with a sky location in M31.\nThe UVOT data show no change in brightness in the optical source reported\nin Hagen & Lien (GCN Circ 17541). \n\nPreliminary detections and 3-sigma upper limits using the UVOT\nphotometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373)\nfor the most recent exposures are:\n\nFilter      T_start(s)   T_stop(s)   Exp(s)      Mag\n\nv            338602      338728        124    >18.25\nb            337955      338082        124    >19.12\nu            337824      337951        124     18.45+-0.27\nuvw1         337564      337819        250     18.82+-0.26\nuvm2         326044      343973       4048     18.64+-0.06\nuvw2         338088      338597        500     18.72+-0.14\n\nAll of these magnitudes are consistent, within uncertainties, of \nour initial and archival measures.\n\nWe further report an analysis of 207 ks of archival UVOT data for\nthe source.  Our analysis shows no previous variability in the source\nin the UVOT photometry, which has a typical uncertainty of 0.2 mag in\nthe three UV filters.",
  "circularId": 17547,
  "createdOn": 1425603259000,
  "email": "siegel@swift.psu.edu",
  "subject": "Further UVOT Observations of Swift J0045.2+4151",
  "submitter": "Mike Siegel at PSU/Swift MOC  <siegel@swift.psu.edu>"
}