{
  "bibcode": "2012GCN.13058....1L",
  "body": "Simone Leonini and Paolo Rosi (Montarrenti Observatory, Siena, Italy)\nreport:\n\nWe observed the field of GRB 120311A (Swift trigger 517469, Markwardt et al.,\nGCN 13032) with 0.53m RC telescope + U47 detector at Montarrenti Observatory\n(Siena, Italy, IAU code C88).\n\nThe observations were performed in four sessions (~22 hours after the\ntrigger):\n\nfrom 2012-03-12 03:22:33 UT to 2012-03-12 03:23:15 UT\nfrom 2012-03-12 04:16:03 UT to 2012-03-12 04:16:46 UT   \nfrom 2012-03-12 04:18:09 UT to 2012-03-12 04:18:52 UT   \nfrom 2012-03-12 04:20:16 UT to 2012-03-12 04:20:59 UT\n\nEight unfiltered images of 40s exposure were obtained.\nWe do not detect any new point source in the coadded images (limit R~19.1,\nUSNO-B1 catalogue) within the refined XRT error circle (Goad et al.,GCN Circ\n13035) or in the afterglow candidate position reported by Melandri et al.\n(GCN Circ 13033).  Observations were made on the twilight.",
  "circularId": 13058,
  "createdOn": 1331642703000,
  "email": "s.leonini@iol.it",
  "subject": "GRB 120311A: C88 optical limits",
  "submitter": "Simone Leonini at Monarrenti Obs  <s.leonini@iol.it>",
  "eventId": "GRB 120311A"
}