TITLE:   GCN CIRCULAR
NUMBER:  10566
SUBJECT: GRB 100331B: BOOTES-3 observations
DATE:    10/04/02 15:09:25 GMT
FROM:    Antonio Deugarte at IAA-CSIC  <deugarte@iaa.es>

A. de Ugarte Postigo (INAF-OAB),  A.J. Castro-Tirado, J. Gorosabel,
M. Jelinek (IAA-CSIC), P. Kubanek (IPL UV, IAA-CSIC),
R. Cunniffe, S. Guziy (IAA-CSIC), P. Yock  (Auckland Univ.),
W.H. Allen (Vintage  Lane Obs.), I. Bond (Massey Univ.), G. Christie
(Stardome Obs.), report on behalf of a larger collaboration, report:

We have observed the field of the AGILE GRB 100331B
(Del Monte et al. GCN 10560) using the 0.6m Yock-Allen robotic
telescope (BOOTES-3) located in Blenheim, New Zealand.
A combined 36x60s unfiltered exposure with mean epoch 1st
April 2010 at 16:30 UT (19.2 hours after the burst) obtained through
cirrus does not show any source within the Swift/XRT error circle
(D'Elia et al. GCN 10562) down to a 3-sigma limiting magnitude
of R~18.5 using USNO-B1.0 as photometric reference.