[vsnet-grb-info 3500] GRB 060717: NOT observations

[GCN Circulars]

TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  5335
SUBJECT: GRB 060717: NOT observations
DATE:    06/07/18 13:39:02 GMT
FROM:    Pall Jakobsson at U Hertfordshire  <palli at star.herts.ac.uk>

Pall Jakobsson (U. Hertfordshire), Johan P.U. Fynbo,
Jens Hjorth (DARK, NBI), Tine B. Nielsen and Karianne
Holhjem (NOT, La Palma) report:

We observed the afterglow position of GRB 060717 (Sakamoto
et al., GCN 5326) on July 17.906 (12.5 hr post-burst) in
R-band and on July 17.922 (12.9 hr post-burst) in i-band with
ALFOSC on the Nordic Optical Telescope. Inside the revised
XRT error circle (Capalbi et al., GCN 5331), we find no
evidence for any sources. The limiting magnitudes of our
observations are R > 23.8 and i > 22.7.

The corresponding upper limit on beta_OX is 0.42, rendering
the burst dark according to the definition proposed by
Jakobsson et al. (2004, ApJ, 617, L21).