[vsnet-grb-info 26173] GRB 200819A: Optical Observations from HCT

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  28273
SUBJECT: GRB 200819A: Optical Observations from HCT
DATE:    20/08/20 16:13:01 GMT
FROM:    Anirban Dutta at Indian Inst. of Astrophysics  <anirban.dutta at iiap.res.in>

Anirban Dutta(IIA, Bengaluru), Brajesh Kumar(ARIES, Nainital), Avinash
Singh, G. C. 
Anupama, D. K. Sahu and Pramod Kumar (IIA, Bengaluru)

 We observed the field of GRB 200819A (Dichiara et
 al., GCN #28263;  Evans et al., GCN #28265) with the Himalaya Faint
Object
 Spectrograph and Camera  (HFOSC) mounted on the 2-m Himalayan Chandra
Telescope (IAO, Hanle, India). Multiple frames (each 300 sec) of the GRB
field in Bessell R and I bands were obtained with an average airmass of
1.3
and a seeing of  2''. Preliminary PSF photometry on the stacked
images was performed and calibrated against  USNO-B1 catalogue. We do
not
detect any OT within the enhanced XRT position (Belkin et al., GCN
#28266;  Jelinek et al., GCN #28267).

The estimated limiting magnitude is as under -
 Date          |       UT (mean)     | Filter |  Exp time x no. of
frames |  Upper limit (mag)
 2020-08-19        19:16:23          R                300 sec x 4       
               21.5
 2020-08-19        19:32:37          I                 300 sec X 4      
                20.3 

We thank the staff at IAO and CREST for helping with the observations.