{
  "bibcode": "2009GCN..9779....1C",
  "body": "Z. Cano (Liverpool JMU), C. Guidorzi (U. Ferrara), C. Mundell, R.J. Smith,\nD. Bersier, A. Melandri, I.A. Steele, S. Kobayashi, C.J. Mottram,\n(Liverpool JMU), A. Gomboc (U. Ljubljana) report, on behalf of a large\ncollaboration:\n\nFollowing our report of observations on the Liverpool Telescope (Smith et\nal. GCN 9520) we continued monitoring the field of GRB090812 (Swift\ntrigger 359711, Stamatikos et al. GCN 9768) on the Faulkes Telescope South\n(Australia) from 5.88 hours to 8.40 hours post burst in r' and i' bands.\n\nWe find from 6 x 300s stacked images:\n\nt_exp          filter    t-T0          R-mag\n----------------------------------------------------------\n30min          i'        5.88 hours    22.43 +/- 0.25\n30min          i'        8.40 hours    22.85 +/- 0.25\n30min          r'        6.60 hours    22.31 +/- 0.09\n----------------------------------------------------------\n\nThe calibration is still preliminary and determined against stars in\nthe sdss field.\n\nFinally, we find the decay rate in i' from 111s to 2.35ks post burst is\nconsistent with alpha ~ 1.25 +/- 0.1",
  "circularId": 9779,
  "createdOn": 1250100164000,
  "email": "zec@astro.livjm.ac.uk",
  "subject": "GRB 090812: Faulkes Telescope South Continued Optical Monitoring",
  "submitter": "Zach Cano at ARI/John Moores Liverpool  <zec@astro.livjm.ac.uk>",
  "eventId": "GRB 090812"
}