TITLE: GCN CIRCULAR NUMBER: 39551 SUBJECT: EP250302a: FTW optical and NIR detection DATE: 25/03/02 20:56:16 GMT FROM: Brendan O'Connor at Carnegie Mellon University boconno2@andrew.cmu.edu
Malte Busmann (LMU), Brendan O’Connor (Carnegie Mellon U.), Daniel Gruen (LMU) and Antonella Palmese (Carnegie Mellon U.) report:
We observed location of EP250302a (Trigger ID: 01709132186; Zhu et al., GCN 39550) with the Three Channel Imager (3KK) at the Fraunhofer Telescope at Wendelstein Observatory (FTW) in the r, i and J band simultaneously. Observations started at 19:28:31 UT on 2025-03-02, corresponding to ~3.87 hr after the EP-WXT trigger. At the location of the optical counterpart reported by Zhu et al. (GCN 39550) we detect a clear source with brightness r~20.3 AB mag. This confirms the fading of the source and its relation to EP250302a.
We note the presence of a GLADE+ galaxy (~570 Mpc; photometric) at an offset of ~20" (Dalya et al. 2022). There is no underlying source at the position of this optical transient in Legacy Survey imaging. Further observations are encouraged.
We thank Michael Schmidt from the staff of the Wendelstein Observatory for obtaining these observations.
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