[vsnet-grb-info 21673] GRB 190123A: BOOTES-4/MET optical limit

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  23772
SUBJECT: GRB 190123A: BOOTES-4/MET optical limit
DATE:    19/01/23 14:11:37 GMT
FROM:    Alberto Castro-Tirado at Inst.de Astro. de Andalucia  <ajct at iaa.es>

Y.-D. Hu, X.-Y.Li, E. Fernandez-Garcia, A. Ayala, A. J. Castro-Tirado 
(IAA-CSIC), C. Perez del Pulgar, A. Castellon, I. Carrasco (Univ. de 
Malaga),  S. Guziy (Univ. of Nikolaev) and D. Xiong, Y. Fan, X. Zhao, J. 
Bai, C. Wang, Y. Xin (Yunnan Nacional Astronomical Observatory) on 
behalf of a larger collaboration, report:

"Following the detection of GRB 190123A by Swift (D'Ai et al. GCNC 
23769), the 0.6m BOOTES-4/MET robotic telescope at Lijiang Astronomical 
Observatory (China) gathered images starting at 12:36 UT (~0.29 hr after 
trigger). No optical afterglow is found down to 20.9 mag (unfiltered 
images) within the Swift/XRT error box, consistent with the 
non-detections by Swift/UVOT (D'Ai et al. GCNC 23769) or MASTER (Lipunov 
et al. GCNC 23770). Observations are ongoing."