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@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."