[vsnet-grb-info 14782] GRB 140408A: 1.5m OSN optical upper limit

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  16096
SUBJECT: GRB 140408A: 1.5m OSN optical upper limit
DATE:    14/04/10 18:34:22 GMT
FROM:    Soomin Jeong at CSIC  <soominjeong at gmail.com>

S. Jeong, S. R. Oates, J. C. Tello, J. Gorosabel, A. Sota and A. J.
Castro-Tirado (IAA-CSIC), on behalf of a larger collaboration, report:

"Following the detection of GRB140408A by Swift (D'Elia et al., GCNC
16082), we observed the field of GRB 140408A with the 1.5 m OSN telescope
at Observatorio de Sierra Nevada in the R and I-bands. The observation
started on Apr 9, 04:01:16 UT (i.e. ~0.62 d post burst). No optical
afterglow is found at the position of the optical candidate reported by
Varela et al. (GCNC 16089) in the median combined images (6 x 300s)
down to 21.7 mag (I band) and 22.5 mag (R band) (3-sigma upper limits,
with all magnitudes in Vega system and no correction for the Galaxy
reddening)."