TITLE:   GCN CIRCULAR
NUMBER:  32869
SUBJECT: GRB 221027B: BOOTES-1 optical upper limit
DATE:    22/10/28 00:02:43 GMT
FROM:    Youdong HU at IAA-CSIC  <huyoudong072@hotmail.com>

Y.-D. Hu, E. Fernandez-Garcia, A. J. Castro-Tirado, M. D. Caballero-Garcia, R. Sanchez-Ramirez, I. Perez-Garcia (IAA-CSIC),  C. Perez del Pulgar,  A. Castellon, I. Carrasco, A. Reina (Univ. de Malaga) and F. Rendon (IAA-CSIC and INTA-CEDEA) on behalf of a larger collaboration, report:

Following the detection of GRB 221027B by Swift (Lien et al., GCNC 32867), the 0.3m BOOTES-1B robotic telescope in Mazagon (Huelva), southern Spain, automatically responded to this burst on Oct 27 at 19:19:30 UT (~6 min after trigger). In the co-added frame (20 x 10 s, clear filter), no source is detected within the enhanced XRT error position (Beardmore et al., GCNC 32868) down to 17.3 mag, which is consistent with the non-detection reported by UVOT (Lien et al., GCNC 32867).

We thank the staff at INTA-CEDEA for their excellent support.