[AAVSO-HEN] GRB 080810: 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:  8093
SUBJECT: GRB 080810: Liverpool Telescope observations
DATE:    08/08/11 10:14:52 GMT
FROM:    Cristiano Guidorzi at INAF-OAB  <cristiano.guidorzi at brera.inaf.it>

C. Guidorzi (INAF-OAB), I. Steele (LJMU), N. Tanvir (U. Leicester)
on behalf of a larger collaboration report:

On 2008 August 11 (03:53:56 UT) we began observing the field of GRB 080810
(Page et al. GCN Circ. 8080) with the Liverpool Telescope using
the r' and i' filters.

The optical afterglow is clearly detected at the position reported
by ROTSE-III (Rykoff GCN Circ. 8084) and the NOT (de Ugarte Postigo
et al. GCN Circ. 8089). We found the following magnitudes:

Telescope   Filter  T_mid[hr]   Exposure[s]      Mag
-------------------------------------------------------------
LT          i'        14.770       300         19.14 +/- 0.04
LT          r'        15.328       300         19.93 +/- 0.04
-------------------------------------------------------------

The calibration was performed using the R2 and I magnitudes
of the following nearby USNOB1 catalogue star: 23:47:06.819,
+00:19:27.15, using R2=15.31, I=14.69.