[vsnet-grb-info 17458] GRB 160117B: NOT optical afterglow observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  18884
SUBJECT: GRB 160117B: NOT optical afterglow observations
DATE:    16/01/18 01:27:54 GMT
FROM:    Daniele Malesani at Dark Cosmology Centre, Niels Bohr Inst  <malesani at dark-cosmology.dk>

D. Malesani (DARK/NBI), A. de Ugarte Postigo (IAA/CSIC and DARK/NBI), R. 
Carrera (IAC), P. Jakobsson (Univ. Iceland), report on behalf of a 
larger collaboration:

We observed the optical counterpart of GRB 160117B (Sonbas et al., GCN 
18875; Yurkov et al., GCN 18877; Kruehler et al., GCN 18878) with the 
Nordic Optical Telescope (NOT) equipped with the ALFOSC camera.

In a 300-s exposure taken starting on Jan 18.028 UT (10.7 hr after the 
GRB), we measure for the afterglow a magnitude of R = 20.36 +- 0.11 
(Vega), calibrated against several nearby USNO-B1 stars (R1 magnitudes), 
with the uncertainty mostly due to the scatter in the USNO values.