{
  "bibcode": "2010GCN.10335....1C",
  "body": "A. Cucchiara, D. B. Fox (PennState), E. Berger (Harvard U.)\nreport on behalf of a larger collaboration:\n\n\"On January 16.20 UT we observed the field of GRB100115A\n(Cummings et al. 10325, Margutti et al. GCN 10326) with the\nGemini-North GMOS camera in r and g bands.\nWe collected a sequence of 5x180s images in each filter.\nIn the coadded images the afterglow candidate is visible in\nboth filters (GCN 10328,10331,10332).\n\nOn January 17.20 UT we collected a second epoch with the same set-up.\nThe following magnitude have been calibrated using the USNO-B1.0\nstar at RA: 00:13:30.44 Dec: -00:49:16.93 ( = 19.76 mag):\n\nJan. 16.20 UT:\nr = 21.37 +- 0.08 mag\n\nJan 17.20 UT:\nr = 21.86 +- 0.08 mag\n\nA similar fading of ~0.5 mag is present in our g-band observations.\nTherefore we conclude that Object \"A\", which shows two structures,\ncontains a fading transient. Further observation are planned.\n\nWe thank the Gemini staff, in particular Sandy Leggtt, for performing these\nobservations.",
  "circularId": 10335,
  "createdOn": 1263747232000,
  "email": "cucchiara@astro.psu.edu",
  "subject": "GRB 100115A: Gemini-N photometry",
  "submitter": "Antonino Cucchiara at PSU  <cucchiara@astro.psu.edu>",
  "eventId": "GRB 100115A"
}