{
  "bibcode": "2005GCN..4202....1H",
  "body": "J. P. Halpern, S. Tonnesen, S. Tuttle (Columbia U.), and N. Mirabal\n(U. Michigan) report on behalf of the MDM Observatory GRB follow-up team:\n\n\"We observed the location of Swift GRB 051105a (Mineo et al., GCN #4188)\nusing the MDM 2.4m telescope, with a 4.6x4.6 arcminute field centered\non the improved BAT position (Barbier et al., GCN #4194).  A total of\n2 and 30 minutes exposure were obtained in the Gunn g and r filters, \nrespectively.  The mean epoch of the observations was Nov. 6 02:39 UT,\nor 20 hours after the burst.  The following R magnitudes of objects\nmentioned in previous GCN circulars were measured, referenced to the\ncomparison star magnitude R=17.0 used by Piranomonte et al. (GCN #4201):\n\n---------------------------------------------------------------------------\nR.A. (J2000)  Decl. (J2000)      R(mag)          ID             GCN ref\n---------------------------------------------------------------------------\n17 41 10.00   +34 55 45.2    21.15 +/- 0.03  inside XRT S1   4195,4196,4201\n17 41 10.28   +34 55 41.1    22.50 +/- 0.12  outside XRT S1  4196,4201\n17 41 03.28   +34 59 03.6    23.24 +/- 0.22  radio           4199\n---------------------------------------------------------------------------\n\nPositional uncertainties are 0.3\" in the USNO B1.0 reference system, except\nfor the faint object that is, nevertheless, consistent in position with the \nradio source of Frail & Cameron (GCN #4199).  The bright object in the error\ncircle of XRT S1 is clearly blue in g-r, as well as on the Palomar Sky Survey\nplates, and might therefore be an X-ray detected QSO.  Our magnitude of it \nis consistent with that measured by Piranomonte et al. (GCN #4201) 7 hours \nearlier.\"",
  "circularId": 4202,
  "createdOn": 1131253464000,
  "email": "jules@astro.columbia.edu",
  "subject": "GRB 051105a: MDM Observations",
  "submitter": "Jules Halpern at Columbia U.  <jules@astro.columbia.edu>",
  "eventId": "GRB 051105A"
}