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GCN Circular 10043

Subject
GRB 091018: BOOTES-3 observations
Date
2009-10-19T19:49:59Z (15 years ago)
From
Antonio Deugarte at IAA-CSIC <deugarte@iaa.es>
A. de Ugarte Postigo (INAF-OAB), P. Kubanek (U. Valencia, IAA-CSIC),
M. Jelinek, A.J. Castro-Tirado, J. Gorosabel, R. Cunniffe, S. Guziy  
(IAA-CSIC),
B.A. Allen (Vintage Lane Obs.) and P. Yock (Auckland Univ.) report:

We have observed the afterglow of GRB 091018 (Stamatikos et al. CGN
10034) with the 0.6m Yock-Allen telescope (BOOTES-3) located in
Blenheim (New Zealand). A combination of 21x30s unfiltered images with
mean epoch Oct. 19.625 UT (18.2 hours after the burst) shows the  
afterglow
at a magnitude of R=20.0+/-0.3. The photometry has been obtained using
as comparison 5 USNO-B1.0 stars. This magnitude implies a rough
decay slope of alpha = 0.7 +/- 0.2 (with F ~ t^(-alpha)) as compared to
the values of Filgas et al. (GCN 10039). Further analysis is ongoing.
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