[vsnet-grb-info 21849] GRB 190311A: NEXT-0.6m optical afterglow detection

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  23948
SUBJECT: GRB 190311A: NEXT-0.6m optical afterglow detection
DATE:    19/03/11 15:50:36 GMT
FROM:    Dong Xu at NAOC/CAS  <dxu at nao.cas.cn>

Z.P. Zhu, D. Xu, B.Y. Yu (NAOC) report on behalf of larger collaboration:

We observed the field of GRB 190311A (Troja et al., GCN 23946) using the 
robotic NEXT-0.6m telescope located at Nanshan, Xinjiang, China. 
Observations started at 14:25:14 UT on 2019-03-11, i.e., 101 sec after 
the BAT trigger. A series of 40 s, 60 s , 90 s, 300 s R-band frames were 
obtained, and photometry is still ongoing.

An uncatalogued optical source is detected at coordinates

R.A. (J2000) = 14:08:15.71
Dec. (J2000) = +53:30:01.7

with an uncertainty radius ~0.3 arcsec, being consistent with Swift/UVOT 
position  (Troja et al., GCN 23946). The source has m(R) ~ 19.7 mag at 
413 s post-burst, and is fading. We conclude that the source is the 
optical afterglow of the burst.