[vsnet-grb-info 3550] GRB 060801: optical observations at Hanle and Calar Alto

[GCN Circulars]

TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  5384
SUBJECT: GRB 060801: optical observations at Hanle and Calar Alto
DATE:    06/08/01 22:06:47 GMT
FROM:    Alberto Castro-Tirado at Inst.de Astro. de Andalucia  <ajct at iaa.es>

A. J. Castro-Tirado (IAA-CSIC Granada), G. C. Anupama,
S. Srividya, Ramya (IIAP-RES Bangalore), A. de Ugarte Postigo
(IAA-CSIC), S. Sanchez, L. Montoya (CAHA Almeria), A. Castillo,
J. F. Muñoz-Mateos (Univ. Complutense Madrid),
M. Jelínek and J. Gorosabel (IAA-CSIC),

report:

"Following the detection by SWIFT of the short GRB 060801
(Racusin et al. GCNC 5378, Sato et al. GCN 5381), we have
taken R-band frames at the 2.0m Hanle telescope in India
(+HFOSC) starting on Aug 1.75 UT. Additional BVR-band frames
have been taken with the auxiliary port camera at the 3.5m
telescope at the German-Spanish Calar Alto Observatory in
south Spain, starting on Aug 1.935 UT. Near the  position of
the X-ray afterglow (Racusin et al. GCN 5382), we detect two
faint optical sources in the R-band images:

source A: 14 12 01.8  +16 59 00.5

source B: 14 12 01.3 +16 58 54.0

with 1" accuracy (for the time being).

source A is at the edge of the XRT error box and brighter than
source B and it seems to be constant in brightness over the time
interval of our observations. Source B is consistent with the
XRT error box and there is marginal evidence that source B has
declined in brightness, with R = 22.5 +/- 0.5 (preliminary) in the
3.5m CAHA images. Further analysis is in progress."

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