TITLE:   GCN CIRCULAR
NUMBER:  31900
SUBJECT: GRB 220412B: BOOTES-1 optical upper limit
DATE:    22/04/14 00:04:34 GMT
FROM:    Youdong HU at IAA-CSIC  <huyoudong072@hotmail.com>

Y.-D. Hu, E. Fernandez-Garcia, T.-R. Sun, A. J. Castro-Tirado, M. D. Caballero-Garcia, R. Sanchez-Ramirez (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 short GRB 220412B by Swift (Gropp et al., GCNC 31886), the 0.3m BOOTES-1B robotic telescope in Mazagon (Huelva), southern Spain, automatically responded to this burst on Apr 13 at 03:46 UT (~10.7 hours after trigger). In the co-added frame (45 x 60 s, clear filter), no source is detected within the BAT error box (Gropp et al., GCNC 31886) down to 18.8 mag, which is consistent with the non-detections reported by UVOT (Gropp et al., GCNC 31886), MITSuME (Murata et al. GCNC 31889), GIT (Kumar et al. GCNC 31892) and MASTER (Lipunov et al., GCNC 31894).

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