TITLE:   GCN CIRCULAR
NUMBER:  32408
SUBJECT: GRB 220715B: BOOTES-network optical upper limits
DATE:    22/07/16 00:34:30 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, M. A. Castro Tirado (Univ. de Malaga), R. Fernandez-Munoz (IHSM/UMA-CSIC), M. Jelinek (ASU-CAS) and F. Rendon (IAA-CSIC and INTA-CEDEA) on behalf of a larger collaboration, report:

Following the detection of GRB 220715B by both Swift (Troja et al., GCNC 32405) and Fermi (GBM team., GCNC 32404), the 0.3m BOOTES-1B robotic telescope in Mazagon (Huelva, Spain) automatically responded to this burst on Jul. 15 at 22:25:39 UT (i.e. ~57 s after trigger). In the co-added frame (30 x 10 s, clear filter), no source is detected within the enhanced XRT position (Evans et al., GCNC 32406) down to 16.1 mag.

Later on, the 0.6m BOOTES-2/TELMA robotic telescope at IHSM La Mayora (UMA-CSIC) in Algarrobo Costa (Malaga, Spain) automatically pointed to the burst position at 22:26:07 UT (i.e. ~85 s after trigger). In the co-added image (25 x 10 s, clear filter), no optical afterglow is detected within the enhanced XRT position (Evans et al., GCNC 32406) down to 18.4 mag.

We note the expected high galactic extinction towards the burst location, in the direction of the Galactic Bulge.

We thank the staff at INTA-CEDEA and IHSM/UMA-CSIC La Mayora for their excellent support.