TITLE:   GCN CIRCULAR
NUMBER:  38120
SUBJECT: EP241107a: FTW Optical and NIR observations of the optical counterpart
DATE:    24/11/07 21:38:22 GMT
FROM:    Malte Busmann at Ludwig-Maximilians-Universität München <m.busmann@physik.lmu.de>

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

We observed the counterpart of EP241107a (Zhou et al., GCN 38112; Odeh et al.; GCN 38115; Kang et al.; GCN 38116; Lipunov et al.; GCN 38117; Mohan et al.; GCN 38118) with the Three Channel Imager (3KK) at the Fraunhofer Telescope Wendelstein (FTW) in the r, i and J band simultaneously for 14 x 180 s starting at 2024-11-07T20:29:01 UT (6.31 h = 0.26 days after the trigger). We detect the counterpart at

r = (19.65 +/- 0.01) mag
i = (19.40 +/- 0.01) mag
J = (18.71 +/- 0.01) mag

The r- and i-band magnitudes are calibrated against the PS1 catalog and the J-band is calibrated with the 2MASS catalog. All magnitudes are provided in the AB system and not corrected for Galactic extinction.

We thank the staff of the Wendelstein Observatory for obtaining these observations.