TITLE: GCN CIRCULAR NUMBER: 7700 SUBJECT: GRB 080506:Optical observations from HCT DATE: 08/05/08 19:41:11 GMT FROM: T.P. Prabhu at Indian Astro. Obs. D.K. Sahu, G.C. Anupama (IIA, Bangalore), Kuntal Misra (ARIES) report. The field of GRB 080506 (Baumgartner et al., GCN 7685) was observed using HFOSC mounted on the 2-m Himalayan Chandra Telescope, Indian Astronomical Observatory, India. A series of 300sec exposures were taken in R-band between 20:45 UT and 23:00 UT on 06/05/2008. The optical counter part is detected in all our frames. Using the calibration by Kawabata et al. (GCN 7686), the estimated R band magnitude of the optical counter part is 20.13+/-0.1 mag at 20:47UT. The optical counter part faded by ~ 0.6 magnitude during our observations. This message may be cited.