{
  "bibcode": "2012GCN.13387....1X",
  "body": "D. Xu (WIS), A. de Ugarte Postigo (IAA-CSIC, DARK/NBI), D. Malesani\n(DARK/NBI), D. Gandolfi (ESTEC/ESA), G. Leloudas (OKC, Stockholm)\nreport on behalf of a larger collaboration:\n\nWe observed the Swift/BAT field of GRB 120624B (Gruber et al., GCN\n13377; Vianello&  Kocevski, GCN 13379; Sakamoto et al., GCN 13384)\nusing the 2.5m Nordic Optical Telescope (NOT) equipped with the ALFOSC\ncamera, at La Palma, Canary Islands. Observations started at 21:26 UT\non 2012-06-25 (i.e., 23.05 hr after the Fermi trigger) and a series of\nSDSS r-band frames with a total exposure time of 1250s were obtained,\nbut were affected by the dusty calima from the Sahara desert.\n\nNo new optical source was detected within the refined BAT error circle\ndown to a 3-sigma limit of r(AB)~21.0.",
  "circularId": 13387,
  "createdOn": 1340667129000,
  "email": "dong.dark@gmail.com",
  "subject": "GRB 120624B: NOT optical upper limit",
  "submitter": "Dong Xu at Weizmann Inst  <dong.dark@gmail.com>",
  "eventId": "GRB 120624B"
}