GCN Circular 42674
Julius Gassert (CMU/LMU), Malte Busmann (LMU), Xander J. Hall (CMU), Brendan O’Connor (CMU), Daniel Gruen (LMU), and Antonella Palmese (CMU) report:
We observed a sample of 19 DESI galaxies, ranked by 3D position and brightness following the methodology laid out in Hall et al. (2025), in the sky localization region of gravitational wave event S251112cm (GCN 42650) with the Three Channel Imager (3KK) at the Fraunhofer Telescope at Wendelstein Observatory (FTW) in the r, i, and J bands simultaneously. Observations started at 2025-11-12T17:43 (UT). Typical three-sigma limits for point sources are r, i ~ 21, and the field of view is 7’x7’. We do not identify any candidate GW counterpart in difference imaging with respect to Legacy Survey and PS1 data. The coordinates of the observed targets are listed below.
| R.A. | dec |
|---|---|
| 164.426910134 | 37.65453732955 |
| 165.5240393492 | 38.78722513647 |
| 167.4811243685 | 36.94655132258 |
| 173.5605908567 | 49.0431665104 |
| 182.4385674509 | 56.52359456357 |
| 182.8894005861 | 57.73745323273 |
| 186.0084874694 | 58.38519262405 |
| 196.9032263873 | 60.15719529696 |
| 197.1937364898 | 62.27166824173 |
| 250.834423606 | 70.63254712505 |
| 341.1015299287 | -0.162034769873 |
| 341.5808358893 | 3.210042314846 |
| 343.2053071078 | 1.201113639068 |
| 344.2120066199 | -8.967554297055 |
| 344.5092848207 | -3.76968999454 |
| 345.0369565289 | -12.80783236183 |
| 346.7423345683 | -9.286127524436 |
| 347.1867614296 | -12.63952485965 |
| 349.7190055484 | -10.25928200595 |
We thank Christoph Ries from the Wendelstein Observatory staff for obtaining these observations.