[AAVSO-HEN] GRB 080903: Liverpool Telescope observations

[grb at aavso.org]

The following is a GCN Circular circulated via the AAVSO network.
For an archive and more information on circulars visit:
http://lheawww.gsfc.nasa.gov/docs/gamcosray/legr/bacodine/gcn3_archive.html

TITLE:   GCN CIRCULAR
NUMBER:  8174
SUBJECT: GRB 080903: Liverpool Telescope observations
DATE:    08/09/03 09:10:06 GMT
FROM:    Cristiano Guidorzi at INAF-OAB  <cristiano.guidorzi at brera.inaf.it>

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.