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GCN Circular 8174

GRB 080903: Liverpool Telescope observations
2008-09-03T09:10:06Z (16 years ago)
Cristiano Guidorzi at INAF-OAB <>
C. Guidorzi (INAF-OAB), R. J. Smith (LJMU), A. Gomboc (U. Ljubljana)
on behalf of a larger collaboration report:

On 2008 September 03 (03:32:18 UT) we began observing the field of
GRB 080903 (Grupe et al. GCN Circ. 8169) with the Liverpool Telescope
using the SDSS i filter.

We clearly detect the optical afterglow candidate reported by de
Ugarte Postigo et al. (GCN Circ. 8172) and Korotkiy et al.
(GCN Circ. 8173). We found the following magnitudes:

Telescope   Filter  T_mid[hr]   Exposure[s]      Mag
LT          i'         2.59       6x300        21.32 +/- 0.07
LT          i'         4.08       6x300        21.52 +/- 0.11

The calibration was performed using the I magnitude of the following
nearby USNOB1 catalogue star: 05:47:14.30, +51:15:32.8, using I=14.77.
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