TITLE:   GCN CIRCULAR
NUMBER:  31752
SUBJECT: GRB 201021C: TAROT Reunion observatory optical light curve
DATE:    22/03/13 22:08:20 GMT
FROM:    Alain Klotz at IRAP-CNRS-OMP  <Alain.Klotz@free.fr>

A. Klotz (CNRS-OMP-IRAP),
M. Fortune, R. Augerai (Universite de la Renuion),
P. Thierry  (AGORA),
L. Eymar, S. Antier, M. Boer, A. de Ugarte Postigo (CNRS-OCA-ARTEMIS),

We analyzed archive images of the SWIFT trigger 1001130 (GRB 201021C,
BAT detection by  Lien et al. GCN Circ. 28730,
early optical ground observations by Lipunov et al. GCN Circ. 28733,
redshift by Vielfaure et al. GCN Circ. 28739)
with the TAROT robotic telescope (D=18cm) located
at Les Makes Observatory, Reunion Island, France.

Images were acquired without any filter, camera FLI PL16803
and Takahashi Epsilon 180ED.

According the reference star NOMAD-1 0340-0006028 R=13.85
we give the photometry of the GRB optical transient:

  t1(s) t2(s)     R  dmag
    813   993 15.92  0.04
   1003  1183 16.02  0.03
   1190  1370 16.24  0.05
   1388  1568 16.28  0.04
   1575  1755 16.52  0.06
   1762  1942 16.62  0.06
   2048  2228 16.80  0.08
   2236  2416 16.92  0.09
   2425  3178 17.12  0.06
   3198  4132 17.54  0.09
   4139  9462 17.82  0.10

t1 and t2 are start and stop acquisition since the trigger.

Magnitudes are not corrected for Galactic dust extinction.