TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  3500
SUBJECT: GRB050528: BOOTES optical candidate (retraction)
DATE:    05/05/28 14:52:48 GMT
FROM:    Martin Jelinek at Inst.Astrophys.Andalucia,Granada  <mates@asu.cas.cz>

Martin Jelinek, Alberto J. Castro-Tirado, Antonio de Ugarte
Postigo, Stanislav Vitek, Sergey Guziy (IAA CSIC Granada,
Spain), Petr Kubanek, Rene Hudec, Martin Nekola, (ASU AV CR
Ondrejov, Czech Republic) Petr Pata, Martin Bernas (CVUT
Praha, Czech Republic), and Tomas de J. Mateo Sanguino (Univ.
Huelva, Spain)

enunciate sadly

that the optical candidate reported by ourselves in previous
GCN (Jelinek et al., GCN3498) is in fact a star, which is not
present in GSC2 catalogue. This mislead me (MJ) and although
doing a double-check using DSS, I have missed the star, thus
convincing myself about reality of the object.

We apologize to the comunity for a false alert.

Anyhow: The BOOTES-1B has observed the errorbox starting 71s
after the trigger in a light twilight, setting the limit to
the possible GRB counterpart to V>13.8 and I>13.0 during the
first 60s after the beginning of our observation.