TITLE:   GCN CIRCULAR
NUMBER:  32311
SUBJECT: GRB 220701A: BOOTES-5/JGT early optical upper limit
DATE:    22/07/01 14:37:07 GMT
FROM:    Youdong HU at IAA-CSIC  <huyoudong072@hotmail.com>

Y.-D. Hu, E. Fernandez-Garcia, A. J. Castro-Tirado, I. Perez-Garcia, M.D. Caballero-Garcia, R. Sanchez-Ramirez (IAA-CSIC), D. Hiriart and W. H. Lee (UNAM), C. J. Perez del Pulgar and I. Carrasco (UMA), I. H. Park (SKKU) on behalf of a larger collaboration, report:

Following the detection of GRB 220701A by Swift (Evans et al. GCNC 32306), the BOOTES-5/JGT 0.6m robotic telescope at Observatorio Astronomico Nacional in San Pedro Martir (Mexico) observed the GRB location starting on Jul 01, 04:55:30 UT (~152 s after trigger). In the early co-added image (20 x 10 s exposures in the clear filter), no optical afterglow is detected within the Swift/XRT error region (Evans et al. GCNC 32306, GCNC 32308) down to 20.4 mag. This non-detection is consistent with those results from KAIT (Zheng et al. GCNC 32307), LDT (O'Connor et al. GCNC 32309) and UVOT (Oates et al. GCNC 32310).

We thank the staff at Observatorio Astronomico Nacional in San Pedro Martir for their excellent support.