Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 28776

GRB 201020B: HCT and GIT continued optical follow-up observations
2020-10-25T09:04:20Z (4 years ago)
Harsh Kumar at Indian Inst of Tech,Bombay <>
H. Kumar(IITB), S. Kiran (IIA), J.Stanzin (IAO), V. Bhalerao(IITB), G. C.
Anupama(IIA), S. Barway(IIA) report on behalf of the HCT team:

We followed-up GRB 201020B reported by Fermi GBM Team (GCN #28702, also
see: V. Lipunov et. al., GCN #28718; D. Xu et. al., GCN #28719) with 2.0m
Himalayan Chandra Telescope (HCT) and 0.7m GROWTH-India Telescope (GIT). We
obtained a series of 300-sec exposures in the Rc, r filters. Afterglow was
clearly detected at a position consistent with V. Lipunov et. al., GCN
#28718; D. Xu et. al., GCN #28719. Here are the photometric results from
HCT & GIT observations:-


 JD (mid) | T_mid-T0(hrs) | Filter | Mag | Telescope |


 2459145.40625 | 52.22 | r | 21.01 +/- 0.04 | GIT |

 2459146.32699 | 74.80 | Rc | 21.28 +/- 0.04 | HCT |


Our results are consistent with the power-law decay of 1.67 reported in S.
Belkin et al. GCN #28768; H. Kumar et al. GCN #28753.

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

The GROWTH India Telescope (GIT) is a 70-cm telescope with a 0.7 degree
field of view, set up by the Indian Institute of Astrophysics and the
Indian Institute of Technology Bombay with support from the Indo-US Science
and Technology Forum (IUSSTF) and the Science and Engineering Research
Board (SERB) of the Department of Science and Technology (DST), Government
of India ( It is located at the
Indian Astronomical Observatory (Hanle), operated by the Indian Institute
of Astrophysics (IIA).
Looking for U.S. government information and services? Visit