TITLE:   GCN CIRCULAR
NUMBER:  42578
SUBJECT: EP251102a: FTW optical and NIR observations
DATE:    25/11/04 13:49:28 GMT
FROM:    Malte Busmann at Ludwig-Maximilians-Universität München <m.busmann@physik.lmu.de>

Malte Busmann, Rasika Deshpande (LMU), Xander Hall, Brendan O’Connor (Carnegie Mellon U.), Daniel Gruen (LMU), and Antonella Palmese (Carnegie Mellon U.) report:

We observed the counterpart of EP251102a (Schneider et al., GCN 42544; Eyles-Ferris et al., GCN 42546; Liang et al., GCN 42548; Mo et al., GCN 42563; Adami et al., GCN 42575) with the Three Channel Imager (3KK) at the Fraunhofer Telescope at Wendelstein Observatory (FTW) in the r, i, and J bands simultaneously for 7 x 180 s starting at 2025-11-04T04:50:46 UT (0.94 days after the trigger). We detect the counterpart in all bands and report the following magnitude:

r = (21.02 +/- 0.06) AB mag

The magnitude is calibrated against the PS1 catalog and not corrected for Galactic extinction.

We thank Christoph Ries for obtaining these observations.