[vsnet-grb-info 21791] GRB 190211A: NOT optical observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  23890
SUBJECT: GRB 190211A: NOT optical observations
DATE:    19/02/12 09:23:10 GMT
FROM:    Dong Xu at NAOC/CAS  <dxu at nao.cas.cn>

K.E. Heintz (Univ. of Iceland), D. Xu (NAOC), D.B. Malesani (DAWN/NBI 
and DARK/NBI), S. Moran (NOT), report on behalf of a larger collaboration:

We observed the field of GRB 190211A (Marshall et al., GCN 23883) using 
the 2.56-m Nordic Optical Telescope (NOT) equipped with the ALFOSC 
camera. We obtained 3x200 s SDSS r-band and 3x300 s SDSS z-band frames, 
starting at 02:23:58 UT on 2019-02-12, i.e., 9.487 hr after the BAT trigger.

The previously reported optical afterglow (e.g., Xu et al., GCN 23884; 
Hu et al., GCN 23886) is clearly detected in our stacked images. The 
afterglow faded to m(r)=22.7 ¡À 0.1 mag at 9.578 hr post-burst and m(z) = 
22.0 ¡À 0.2 mag at 9.815 hr post-burst, calibrated with nearby SDSS stars.