{
  "bibcode": "2005GCN..3358....1C",
  "body": "S. Bradley Cenko, Derek B. Fox (Caltech), Joshua Rich, Brian Schmidt\n(ANU), Jessie Christiansen (UNSW), and Edo Berger (Carnegie) report:\n\nWe have further analyzed our images of the field of GRB050502b (GCN\n3330) taken with the 1-m ANU telescope (GCN 3338).  Additionally, we\nhave imaged the field with the automated Palomar 60-inch telescope\n(P60).  Observations at the P60 consisted of 10 x 120 s exposures in the\nGunn i band taken at a mean epoch of 5:40 4 May 2005 UT (43.8 hours\nafter the burst).\n\nBased on extrapolations from the 2MASS and USNO-B2 catalogs, we adopt\nvalues of V=16.7, I=15.8, R=16.1 for the star located at RA =\n09:30:12.616, Dec = +17:00:05.55 (J2000.0).  We find the magnitude of\nthe afterglow candidate identified by Rich, Schmidt, and Christiansen\n(GCN 3338) as follows:\n\nFilter  Facility       UT           Age      Limit (3-sig) or measure\n========================================================\nV        ANU1m       9:35 May 2    9.5 min    V>20.7\nV        ANU1m       9:41 May 2    15 min     V>20.2\nV        ANU1m       9:43 May 2    18 min     V>20.8\nV        ANU1m       9:46 May 2    20 min     V>21.8 \nI        ANU1m       9:58 May 2    23 min     I=19.84+/-0.09 \ni\t P60         5:40 May 4    43.8 hr    i>21.7\n\nWe therefore identify this source as the afterglow of GRB050502b.  To\nreiterate the coordinates (J2000.0):\n\n\tRA      09:30:10.024 \n\tDEC     +16:59:48.07\n\nFinally, we note the spectral slope at early times, beta > 2.9,\nindicates that GRB050502b may be either highly extinguished or at\nmoderately high redshift.",
  "circularId": 3358,
  "createdOn": 1115289517000,
  "email": "brian@mso.anu.edu.au",
  "subject": "GRB050502b: Afterglow Confirmation: Correction to OT Coordinates",
  "submitter": "Brian Schmidt at RSAA, ANU (MSSSO)  <brian@mso.anu.edu.au>",
  "eventId": "GRB 050502B"
}