GRB 240715A: TRT optical upper limit on one Swift/XRT candidate

We observed the field of short-hard GRB 240715A detected by Fermi/GBM (Fermi GBM team, GCN 36866), IPN (Kozyrev et al., GCN 36872), and SVOM/GRM (Huang et al., GCN 36881) using the 0.7-m telescope of the Thai Robotic Telescope (TRT) network, located at Cerro Tololo, Chile. We obtained 3 x 300 s R-band frames at a median time 24.0 hr after the Fermi trigger. We observed the "Good" one (R.A. = 00h20m35.12s, Dec.=-36°23'22.4″) of the three Swift/XRT candidates (https://www.swift.ac.uk/ToO_GRBs/00021699/). No new optical source is detected in the stacked image at the XRT position, down to a 5-sigma limiting magnitude of R ~ 20.7, calibrated with SkyMapper stars and not corrected for Galactic extinction.