[vsnet-grb-info 21536] IERCOO/ICSP optical observation of GRB 190106A

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  23635
SUBJECT: IERCOO/ICSP optical observation of GRB 190106A
DATE:    19/01/07 16:12:16 GMT
FROM:    Sandip K. Chakrabarti at ICSP  <sandipchakrabarti9 at gmail.com>

IERCOO/ICSP  optical observation of GRB 190106A


Sandip K. Chakrabarti, Argha Sil, Shyam Sarkar, Ashim Sarkar, D.
Bhowmick (Indian
Centre for Space Physics)
We observed GRB 190106A using 0.61m reflector of our observatory at
Sitapur, West Bengal, India. The observation was with R, V, and B filters
in a short interval at around 16:45UT on 6th January, 2019, i.e., about
three hours after the BAT trigger (Sonbas et al. 2019; GCN 23615). Using
two exposures each of 90s in R and in V, we obtained the magnitudes of
17.83+/-0.25 and 18.45 +/- 0.23 respectively. Using one 90s exposure in B,
we obtained the magnitude of 18.81+/-0.39. Using triangulation, we obtained
the location of the afterglow to be RA(J2000) = 01h 59m 31.17s, Dec(J2000)
= +23d 50m 43.94s with two pixel error 0.46s. Three sigma method was used
to estimate the magnitudes with a calibrator J01593557 +2348527 which is of
V mag ~12.5. After 24 hours of the BAT trigger we do not detect the
afterglow on 7th Jan. at 13:30UT. The details of images and other results
will be in http:/csp.res.in.