{
  "bibcode": "2011GCN.12036....1S",
  "body": "S. Schulze (U. Iceland), D. Xu (WIS), P. Jakobsson (U. Iceland), T.\nPursimo (NOT Observatory), report on behalf of a larger collaboration:\n\nWe observed the field of GRB 110521A (Oates et al., GCN 12031) with\nthe Nordic Opitcal Telescope (NOT) equipped with ALFOSC. We obtained\n3x300 s R-band and 6x300 s I-band images. Observations started at\n22:01 UT on May 21 (i.e., 6.1604 hrs after the burst).\n\nWe do not detect any source in the stacked R-band and I-band images at\nthe refined XRT position (Beardmore et al., GCN 12034).\n\nThe limiting magnitudes are R ~ 24.4 mag at the mid-exposure time\nt = 6.285 hrs post-burst, and I ~ 23.8 mag at the mid-exposure time\nt = 6.745 hrs post-burst, calibrated with the #1358-0196725 star\n(R1 = 19.57, R2 = 19.58, and I =18.81) in the USNO B1 catalogue.",
  "circularId": 12036,
  "createdOn": 1306025695000,
  "email": "steve@raunvis.hi.is",
  "subject": "GRB 110521A - NOT optical observation",
  "submitter": "Steve Schulse at U. of Iceland  <steve@raunvis.hi.is>",
  "eventId": "GRB 110521A"
}