[vsnet-grb-info 17133] GRB 151022A: OSN optical upper limit

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  18465
SUBJECT: GRB 151022A: OSN optical upper limit
DATE:    15/10/24 11:29:51 GMT
FROM:    Samantha Oates at MSSL  <sro at mssl.ucl.ac.uk>

S. R. Oates (IAA-CSIC), S. Jeong (IAA-CSIC/SKKU), V. Casanova, J. C. Tello (IAA-CSIC) and
A. J. Castro-Tirado (IAA-CSIC/UMA), report on behalf of a larger collaboration:

We observed the field of GRB 151022A (D'Avanzo et al., GCN Circ. 18436) with the 1.5m
OSN telescope at Observatorio de Sierra Nevada (Spain). The observations
were carried out in the I band on Oct 22.79163 - 22.84025 (4.89 - 6.06 hours
post bust). We do not detect any new optical source within the enhanced XRT 
error circle (Beardmore et al., GCN Circ. 18444) down to a limiting magnitude of I ~21.5 mag.