TITLE:   GCN CIRCULAR
NUMBER:  31990
SUBJECT: GRB 220501A: BOOTES-1 optical upper limit
DATE:    22/05/02 18:47:52 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, 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 220501A by Swift (D'Ai et al., GCNC 31982) and Fermi (Fermi GBM team, GCNC 31983, Roberts et al. GCNC 31988), the 0.3m BOOTES-1B robotic telescope in Mazagon (Huelva), southern Spain, automatically responded to this burst on May 1 at 20:14 UT (~22.3 min after trigger), right after the twilight and at high airmass. In the co-added frame (38 x 10 s, clear filter), no source is detected within the BAT error position (D'Ai et al., GCNC 31982) down to 17.5 mag, which is consistent with the non-detection reported by Klotz et al. (GCNC 31984).

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