TITLE: GCN CIRCULAR NUMBER: 39626 SUBJECT: EP250308a: FTW optical and NIR upper limits DATE: 25/03/09 05:35:45 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 the 90% of EP-WXT trigger 01709132392, corresponding to EP250308a, with the Three Channel Imager (3KK) at the Fraunhofer Telescope at Wendelstein Observatory (FTW) in the r, i and J band simultaneously for 19 x 180 s starting at 2025-03-09T03:27:28 UT (0.43 days after the trigger). We performed difference imaging in the i-band with templates from Legacy Survey and detect no new or changing source.
The 3 sigma mean depth of our observations are:
r > 24.0 AB mag i > 23.8 AB mag
The magnitudes are calibrated against the PS1 catalog and not corrected for Galactic extinction.
We thank Michael Schmidt from the Wendelstein Observatory staff for obtaining these observations.
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