[vsnet-grb-info 2090] GRB 050904: BOOTES early R-band detection

[GCN Circulars]

TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  3929
SUBJECT: GRB 050904: BOOTES early R-band detection
DATE:    05/09/06 15:34:03 GMT
FROM:    Alberto Castro-Tirado at Inst.de Astro. de Andalucia  <ajct at iaa.es>

M. Jelinek, A.J. Castro-Tirado, A. de Ugarte Postigo (IAA-CSIC
Granada), P. Kubanek (ASU AV CR Ondrejov), S. Vitek (CVUT
Praha), J. Gorosabel and S. Guziy (IAA-CSIC), R. Hudec (ASU
AV CR), J.M. Castro Ceron (NBI Kobenhavn), P. Pata and M.
Bernas (CVUT),

report:

The BOOTES-1B 30 cm robotic telescope in Southern Spain,
has followed-up the high-redshift GRB 050904 (Cummings et
al. GCN 3910, Antonelli et al. GCN 3924) starting 124s after
the onset of the burst. Our R-band measurements during the
time interval 124s -1100s after the event, together with the
values reported by TAROT (Klotz et al. GCN 3917) are
consistent with an early decay index of alpha = -1.2  (i.e. in
agreement with the value later reported in the J-band by Haislip
et al. GCN 3914).

This message can be quoted.