TITLE:   GCN CIRCULAR
NUMBER:  7709
SUBJECT: GRB 080506: NAYUTA Optical Observation
DATE:    08/05/12 14:19:21 GMT
FROM:    Ryo Iizuka at NHAO  <iizuka@nhao.go.jp>

S. Maeno, H. Naito, S. Narusawa and R. Iizuka report on behalf of NHAO.

We observed the field of GRB 080506 (GCN 7685) with MINT on the
2.0-m NAYUTA telescope at Nishi-Harima Astronomical Observatory,
Japan. We detected the optical afterglow in R-band on 2008 May 6
17:58:02 UT  (701 seconds after the BAT trigger).

The magnitudes relative to the USNO B1.0 catalog are below.

Start(UT) exp(sec) R-mag R-err
--------------------------------------------
02:58:02    150    18.23    0.11
03:03:51    240    18.22    0.12
03:14:22    300    18.51    0.13
03:32:29    300    18.95    0.13
03:53:52    450    19.26    0.13
04:10:55    450    19.64    0.21
--------------------------------------------