TITLE:   GCN CIRCULAR
NUMBER:  19175
SUBJECT: GRB 160313A: TAROT Calern observatory optical observations
DATE:    16/03/13 11:47:05 GMT
FROM:    Alain Klotz at IRAP-CNRS-OMP  <Alain.Klotz@free.fr>

Klotz A., Turpin D., Atteia J.L. (CNRS-OMP-IRAP),
Boer, M., Laugier, R. (CNRS-ARTEMIS),
Gendre B. (UVI - Etelman Obs.) report:

We imaged the field of GRB 160313A detected by SWIFT
(trigger 678929) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 122s after the GRB trigger
(20s after the notice). The elevation of the field decreased from
64 degrees above horizon and weather conditions
were good but images are slightly defocused.

The first image is trailed with a duration of 60.0s
(see the description in Klotz et al., 2006, A&A 451, L39).
We do not detect any OT in the XRT error box published
by Goad et al. (GCNC 19174). Next images are recorded
with diurnal tracking.

t1(s) t2(s)  Rmag_lim  Site
  122   182   15.8      TAROT Calern
  198   228   16.9      TAROT Calern
  239   269   16.8      TAROT Calern
  280   393   18.7      TAROT Calern
  405  1226   18.7      TAROT Calern
1237  3172   19.2      TAROT Calern

Magnitudes were estimated with nearby USNO-B1 stars
and are not corrected for galactic dust extinction.