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GCN Circular 31752

Subject
GRB 201021C: TAROT Reunion observatory optical light curve
Date
2022-03-13T22:08:20Z (2 years ago)
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.
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