[vsnet-grb-info 4811] GRB 070616: BTA optical observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  6547
SUBJECT: GRB 070616: BTA optical observations
DATE:    07/06/17 05:52:23 GMT
FROM:    Alberto Castro-Tirado at Inst.de Astro. de Andalucia  <ajct at iaa.es>

T. Fatkhullin, V. Sokolov (SAO-RAS, Russia), E. Sonbas
(Cukurova Univ., Turkey), A. de Ugarte Postigo, M. Jelínek,
J. Gorosabel (IAA-CSIC, Spain), D. Pérez-Ramírez (Univ.
de Jaén, Spain), S. Guziy (Nikolaev St. Univ., Ukraine) and
A. J. Castro-Tirado (IAA-CSIC, Spain),

report:

"Following the detection by SWIFT of GRB 070616 (Starling
et al. GCNC 6542), we have obtained single VRI frames at the
6m BTA SAO-RAS telescope at Nizhnij Arkhyz (Russia), starting
at 23:57 UT (i.e. 7.5 hr after the event). Within the SWIFT/XRT
error box , we detect in all filters a faint (R ~ 22), reddened
point-like source. Preliminary astrometry yielded RA (J2000)
= 02 08 36.00; Dec (J2000) = +56 56 41.0  (+/- 1"), a position
very close to the USNO B-1 star reported by Kann et al. (GCNC
6545). Further observations are needed to confirm if this is the
optical afterglow to GRB 070616. "

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