[vsnet-grb-info 19294] GRB 170405A: TAROT Reunion observatory optical observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  20989
SUBJECT: GRB 170405A: TAROT Reunion observatory optical observations
DATE:    17/04/06 02:22:43 GMT
FROM:    Alain Klotz at IRAP-CNRS-OMP  <Alain.Klotz at free.fr>

Klotz A., Turpin D., Atteia J.L. (CNRS-OMP-IRAP),
Boer, M., Laugier, R. (CNRS-ARTEMIS),
Gendre B. (UVI - Etelman Obs.)
Thierry P. (Auragne Observatory, France),
Klotz A.N.O. (Guitalens Observatory, France)
report:

We imaged the field of GRB 170405A detected by SWIFT
(trigger 745797) with the TAROT robotic telescope (D=18cm)
located at the Reunion observatory, France.

The observations started 3.84h after the GRB trigger.
We detected the OT (Troja et al., GCN 20984;
Hui & Meegan, GCN 20986; Vianello & Kocevski, GCN 20987;
Malesani, GCNC 20988):

t0+3.84h to t0+3.97h : R=19.0 +/- 0.2

Magnitudes were estimated with the nearby NOMAD1 stars
and are not corrected for galactic dust extinction.