{
  "bibcode": "2010GCN.11170....1D",
  "body": "A. De Cia, P.M. Vreeswijk and P. Jakobsson (University of\nIceland) report:\n\nWe observed the field of GRB 100901A (Immler et al., GCN 11159)\nwith the NOT equipped with ALFOSC in good weather conditions.\nObservations were carried out in the R filter for 15 minutes,\nwith mean time 12.13 hours after the GRB trigger.\n\nWe measure R=17.3 for the afterglow, not corrected for Galactic\nextinction, calibrated against the USNO-B1.0 1127-0027231\nreference star (R=15.37) used by Andreev et al., GCN 11166 and\nGCN 11168.\n\n time after trigger       exposure (s)         R mag\n\n     12.13 hours            3 x 300             17.3\n\nWe acknowledge the careful assistence of the NOT staff, in\nparticular Tapio Pursimo.",
  "circularId": 11170,
  "createdOn": 1283396965000,
  "email": "annalisa@raunvis.hi.is",
  "subject": "GRB 100901A - NOT optical observation",
  "submitter": "Annalisa De Cia at U of Reykjavik,Science Inst.  <annalisa@raunvis.hi.is>",
  "eventId": "GRB 100901A"
}