{
  "subject": "GRB 050509b: Optical observations",
  "eventId": "GRB 050509B",
  "bibcode": "2005GCN..3393....1T",
  "createdOn": 1115652600000,
  "circularId": 3393,
  "submitter": "Ken ichi Torii at RIKEN  <torii@crab.riken.go.jp>",
  "email": "torii@crab.riken.go.jp",
  "body": "K. Torii (Osaka U.) reports:\n\n \"The error region of the Swift short hard GRB 050509b (Hurkett et al. \nGCN 3381; Barthelmy et al. GCN 3385) was imaged with the 0.3 m\ntelescope in the New Mexico Skies observatory.  The observation\nstarted at 2005 May 9, 04:08:52 UT (513 s after the trigger) and 120 s\nintegrations in I and V bands were obtained.\n\n The optical counterpart candidate (Bloom et al. GCN 3388; Cenko et\nal. GCN 3391) of the XRT source (Kennea et al. GCN 3383) is not\ndetected in our frames while the candidate host galaxy is\ndetected. The plate scale of our images is 1\".41/pixel and the optical\ncounterpart candidate should be readily resolved from the galaxy.\n\n We therefore derive the following 3 sigma upper limits for the\noptical counterpart candidate (GCN 3388; GCN 3391) relative to\nUSNO-B1.0 I magnitude.\n\nMidTime(UT) Filter Exposure Mag\n---------------------------------\n04:09:52 I 1x120s >18.7\n04:15:59 I 3x120s >19.2\n---------------------------------\n\""
}