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GCN Circular 36413

Subject
EP240506a: TRT optical upper limit
Date
2024-05-08T10:19:12Z (10 days ago)
From
S. Tinyanont at National Astronomical Research Institute of Thailand <samaporn@narit.or.th>
Via
Web form
S. Tinyanont, R. Anutarawiramkul, P. Butpan (NARIT), S.Q. Jiang, Z.P. Zhu, X. Liu, Z. Fan, W.X. Li, N.C. Sun, Y.N. Wang, D. Xu (NAOC) report on behalf of a large collaboration:

We observed the field of EP240506a (Li et al., GCN 36405) using the 0.7-m telescope of the Thai Robotic Telescope network (TRT), located at Springbrook Observatory, New South Wales, Australia. Observations started at 09:53:36.57 UT on 2024-05-07, i.e., 1.20 day after the EP trigger, and 6 x 300 s R-band and 6 x 300 s I-band frames were obtained, respectively.

No uncatalogued optical transient is detected in the stacked R-band and I-band images within the 3 arcmin EP/WXT error circle (Li et al., GCN 36405), down to 3-sigma limiting magnitudes of R ~ 21.6 and I ~ 21.0, calibrated with Pan-STARRS sources in the field. Also there is no apparent brightening for the catalogued sources within the error circle.
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