TITLE:   GCN CIRCULAR
NUMBER:  35937
SUBJECT: X-ray transient EP240315a: GROND J-band detection
DATE:    24/03/17 07:54:44 GMT
FROM:    Arne Rau at MPE <arau@mpe.mpg.de>

Arne Rau (MPE):

The location of the optical transient AT2024eju (Srivastav et al., GCN35932), discovered within the error circle of the fast X-ray transient EP240315a reported by Einstein Probe n (Zhang et al., GCN 35931), was observed with the optical/NIR imager GROND (Greiner et al. 2008) at the MPG 2.2m telescope at the ESO La Silla Observatory on 2024 March 17th 02:50:23 UT (MJD 60386.118).

With an exposure of 1200s, the source is detected in the J-band at m_vega=19.6+/-0.2 (m_AB=20.5+/-0.2).

We thank the 2.2m staff member, Paul Eigenthaler, for the rapid execution of the observation.