{
  "bibcode": "2008GCN..7622....1F",
  "body": "A. Fukui, Y. Itow, T. Sumi (STE Lab, Nagoya Univ.), and P. Tristram\n(Canterbury Univ.)  on behalf of the MOA Collabration (Bond et\nal. 2001, Sumi et al. 2003) report:\n\nWe observed the optical afterglow of GRB080413A (GCN 7593, Rykoff &  \nRujopakarn; GCN 7594, Beardmore et al.) on Apr. 13 between  \n12:29:16.4 UTC and 14:13:06.6 UTC, corresponding to about 9.5-11 h  \nafter the burst, with the 1.8m MOA-II telescope at Mt. John  \nobservatory in New Zealand.  Total 5 images were obtained with a wide- \nband Red filter (center wavelength ~ 750nm and FWHM ~ 250nm) and  we  \ncould identify the faint afterglow within the error circle (<0.5\").\nThe identified R.A. Dec. are 19:09:11.752 -27:40:39.99 with an  \nuncertainty of 0.14\" (radius, 1sigma) and following are the  \nphotometric results: I magnitude = 20.24 +/- 0.32 at the mid-exposure  \ntime of 2008-04-13 12:29:16.4 UTC, 20.09 +/- 0.19 at 12:51:10.7 UTC,  \n21.40 +/- 0.61 at 13:03:0.1 UTC, 20.05 +/- 0.17 at 13:42:47.0 UTC,  \nand 20.75 +/- 0.25 at 14:13:06.6 UTC. These photometry were done by  \nusing the IRAF and calibrated against the USNO-B1.0 catalog stars,  \nand not corrected for the Galactic extinction.\n\n[GCN OPS NOTE(18apr08): By the moderator's choice, the \"GCN 7594, Stamatikos et al\"\nwash changed to \"GCN 7594, Beardmore et al\". Ack to F. Marshall.]",
  "circularId": 7622,
  "createdOn": 1208303294000,
  "email": "nkawai@hp.phys.titech.ac.jp",
  "subject": "GRB 080413A: MOA-II optical afterglow observations",
  "submitter": "Nobuyuki Kawai at Tokyo Tech  <nkawai@hp.phys.titech.ac.jp>",
  "eventId": "GRB 080413A"
}