[vsnet-grb-info 2521] GRB 051211B: optical afterglow

[GCN Circulars]

TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  4358
SUBJECT: GRB 051211B: optical afterglow
DATE:    05/12/16 13:23:45 GMT
FROM:    Alberto Castro-Tirado at Inst.de Astro. de Andalucia  <ajct at iaa.es>

M. Jelínek, A. de Ugarte Postigo, A.J. Castro-Tirado, 
V. Casanova, D. Martínez, S. Guziy, S. Castillo, S. B. Pandey and J. Gorosabel (IAA-CSIC Granada):

report:

"We have imaged a 7' x 7' region containing the INTEGRAL error box for GRB 051211B (Mereghetti et al. GCNC 4327) with the 1.5-m OSN telescope at the Observatorio de Sierra Nevada, starting on Dec 11.94 UT (i.e. 25 min after the GRB). A comparison image has been taken on Dec. 15.86 UT. At the position of the X-ray afterglow detected by Swift/XRT (La Parola et al. GCN 4338) we detect one source that has decreased significantly in brightness in our I-band images. Coordinates yield:  RA(2000) =  23:02:41.57,Dec(2000) = +55:04:51.5 (+/-0.4"). This is the likely optical afterglow to GRB 051211B. Images are posted at http://www.iaa.es/~deugarte/GRBs/051211B/GRB051211B.gif .
An underlying object seems to be present on the DDS-2 (infrared) which may be a bright host galaxy, detected also on our late I-band image. Further observations are encouraged."

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