GCN Circular 43345
Subject
EP260105a: FTW optical observations
Event
Date
2026-01-06T15:03:15Z (7 days ago)
From
Malte Busmann at Ludwig-Maximilians-Universität München <m.busmann@physik.lmu.de>
Via
Web form
Malte Busmann, Jule Augustin, Mitra Maleki (LMU), Xander J. Hall, Brendan O'Connor (CMU), Daniel Gruen (LMU), and Antonella Palmese (CMU) report:
We observed the 90% FXT localization of EP260105a (Zhou et al., GCNs 43327 and 43333) with the Three Channel Imager (3KK) at the Fraunhofer Telescope at Wendelstein Observatory (FTW) in the r and i-band simultaneously for 10 x 180 s starting at 2026-01-06T02:04:38 UT (0.84 days after the trigger). We performed difference imaging with templates from the DESI Legacy Surveys and did not detect any uncatalogued sources to a 3-sigma upper limit of
r > 22.7 AB mag.
The non-detection is consistent with the reports by Lipunov et al. (GCN 43328), Corcoran et al. (GCN 43332), and Li et al (GCN 43337).
The magnitude is calibrated against the PS1 catalog and not corrected for Galactic extinction.
We thank Christoph Ries from the Wendelstein Observatory for obtaining these observations.