TITLE:   GCN CIRCULAR
NUMBER:  27378
SUBJECT: SGR Swift J1818.0-1607: BOOTES-4/MET optical limit
DATE:    20/03/13 05:26:09 GMT
FROM:    Alberto J. Castro-Tirado at IAA-CSIC  <ajct@iaa.es>

Y.-D. Hu, E. Fernandez-Garcia, 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 Observatories of CAS), on behalf of a larger 
collaboration, report:

Following the detection of SGR Swift J1818.0-1607 by Swift (Evans et al. 
GCNC 27373), the 0.6m BOOTES-4/MET robotic telescope at Lijiang 
Astronomical Observatory (China) gathered images starting at 21:17:34 UT 
(47 s after trigger). No optical afterglow is found down to 19.3 mag (in 
co-added 10x10 s unfiltered images) within the Swift/XRT error box, 
consistent with the non-detection by Swift/UVOT (Evans et al. GCNC 
27373). Further observations are ongoing.

[GCN OPS NOTE(14mar20): Per author's request, Y.Xin's affiliation was changed
from "Yunnan Nacional Astronomical Observatory" to "Yunnan Observatories of CAS".]