TITLE:   GCN CIRCULAR
NUMBER:  28680
SUBJECT: GRB 201015A: HCT optical photometric follow-up
DATE:    20/10/18 15:11:04 GMT
FROM:    Harsh Kumar at Indian Inst of Tech,Bombay  <harshkosli13@gmail.com>

H. Kumar (IITB), D. K. Sahu (IIA), R. Gupta (ARIES), V. Shenoy (IITB), B.
Kumar (ARIES), S. Kiran (IIA), G. C. Anupama (IIA), V. Bhalerao (IITB),
S.B. Pandey (ARIES), S. Barway (IIA), report on behalf of the HCT team:

We observed GRB 201015A reported by Swift-BAT (V. D'Elia et al., GCN
28632;  also see: V. Lipunov et al., GCN 28633; J.A. Kennea et al., GCN
28635; D. B. Malesani et al., GCN 28637; K. Ackley et al., GCN 28639; Y.-D.
Hu et al., GCN 28645; P.A. Evans et al., GCN 28647; A. de Ugarte Postigo et
al., GCN 28649; Z.P. Zhu et al., GCN 28653; S. Belkin et al., GCN 28656; C.
B. Markwardt et al., GCN 28658; A. D'Ai et al., GCN 28660; L. Izzo et al.,
GCN 28661; F. E. Marshall et al., GCN 28662; C. Fletcher et al., GCN
28663;  Martin Jelinek and Jan Strobl et al., GCN 28664; P. Minaev et al.,
GCN 28668; S. Belkin et al., GCN 28673; B. Grossan et al., GCN 28674; J.
Rastinejad et al., GCN 28676;  Z.P. Zhu et al., GCN 28677) with 2.0 m
Himalayan Chandra Telescope (HCT). The field was observed in the V and Rc
filter starting at 2020-10-16T17:54:14.936 UT i.e. ~19 hrs after the event
detection by Swift-BAT. We obtained 9 x 60 sec in Rc and 120 x 9 in the V
band. We clearly detected the source in the stacked image.


We obtained the following photometric results:-

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 JD(Mean) | Filter | Mag | Total exposure (sec) |

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 2459139.250567 | V  | 21.56  +/-  0.1  |  60 x 9

 2459139.262356 | Rc | 21.33  +/-  0.04 | 120 x 9

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These observations were carried out under the ToO program HCT-2020-C3-P6.
We thank HCT staff for conducting the observations.