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GCN Circular 36883

Subject
GRB 240715A: TRT optical upper limit on one Swift/XRT candidate
Date
2024-07-16T10:03:27Z (4 months ago)
From
Dong Xu at NAOC/CAS <dxu@nao.cas.cn>
Via
Web form
S. Tinyanont, R. Anutarawiramkul, P. Butpan (NARIT), J. An, X. Liu, S.Q. Jiang, S.Y. Fu, Z.P. Zhu, D. Xu, Z. Fan, W.X. Li, N.C. Sun, Y.N. Wang (NAOC) report on behalf of a large collaboration:

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.
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