[vsnet-grb-info 9582] GRB 100805A: Liverpool Telescope afterglow observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  11052
SUBJECT: GRB 100805A: Liverpool Telescope afterglow observations
DATE:    10/08/05 06:08:10 GMT
FROM:    Andreja Gomboc at LT,ARI,Liverpool JMU  <ag at astro.livjm.ac.uk>

A. Gomboc (U. Ljubljana), C. Guidorzi (U. Ferrara), D. Kopac (U. Ljubljana) 
report on behalf of a larger collaboration:

On 2010 August 05 at 04:14:32 UT the 2-m Liverpool
Telescope automatically began observing the Swift GRB 100805A
(Hoversten  et al., GCN Circ. 11047) with Ringo 2 instrument, continuing 
with multi-filter (g', r', i') observations at 6.7 min after the GRB trigger.

The LT-TRAP procedure automatically identified the optical afterglow 
at the UVOT position (Hoversten  et al., GCN Circ. 11047, Cenko, GCN Circ. 11050) 
with the following magnitudes:
------------------------------------------------------------------------
T-t0 (s)	Exp. (s)		 Filter		   Mag             
------------------------------------------------------------------------
400  	     10                  r'                 17.92 +- 0.07
421       	     10                  r'                 17.93 +- 0.07
726              10                  r'                 18.36 +- 0.10
3386            60                  r'                 19.79 +- 0.12
------------------------------------------------
We confirm the power-law decay index of 0.8 found by P60 (Cenko, GCN Circ. 11051).

Magnitudes were calibrated from nearby USNOB1.0 R2 stars.
Observations are continuing.