{
  "circularId": 39626,
  "eventId": "EP250308a",
  "body": "Malte Busmann (LMU), Brendan O’Connor (Carnegie Mellon U.), Daniel Gruen (LMU) and Antonella Palmese (Carnegie Mellon U.) report:\n\nWe 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.\n\nThe 3 sigma mean depth of our observations are:\n\nr > 24.0 AB mag\ni > 23.8 AB mag\n\nThe magnitudes are calibrated against the PS1 catalog and not corrected for Galactic extinction.\n\nWe thank Michael Schmidt from the Wendelstein Observatory staff for obtaining these observations.",
  "submittedHow": "web",
  "bibcode": "2025GCN.39626....1B",
  "submitter": "Brendan O'Connor at Carnegie Mellon University <boconno2@andrew.cmu.edu>",
  "format": "text/plain",
  "createdOn": 1741498545161,
  "subject": "EP250308a: FTW optical and NIR upper limits"
}