GCN Circular 44433
Subject
EP260429a: LCO optical upper limits
Event
Date
2026-04-30T11:20:40Z (9 days ago)
From
Rob Eyles-Ferris at U of Leicester <raje1@leicester.ac.uk>
Via
Web form
R. A. J. Eyles-Ferris (Leicester), J. A. Chácon (PUC), F. E. Bauer (SSI and UTA), J. Quirola-Vasquez (Radboud), D. B. Malesani (DAWN/NBI and Radboud), A. J. Levan (Radboud & Warwick), P. G. Jonker (Radboud), report on behalf of a larger collaboration:
We observed the field of the fast X-ray transient EP26029a (Wang et al., GCN 44426) using LCO 1m telescopes located at the Cerro Tololo Inter-American Observatory (Chile) equipped with the SINISTRO instrument. A series of 6x300 s exposures were taken in each of the SDSS-r and SDSS-z filters, starting at 2026-04-30 08:23:54 UT (~18.0 hr after the trigger).
No new source is detected within or at the border of the EP/WXT uncertainty region (Wang et al., GCN 44426) nor do we identify any significant residuals in subtractions using PanSTARRS DR1 templates. From the stacked images, we obtain the following 3-sigma upper limits:
r > 22.5
z > 20.9
These upper limits are in AB magnitudes, calibrated using nearby stars from the Pan-STARRS catalogue, and are not corrected for Galactic extinction.