TITLE:   GCN CIRCULAR
NUMBER:  35962
SUBJECT: X-ray transient EP240315a: GTC/HiPERCAM photometry
DATE:    24/03/18 22:39:47 GMT
FROM:    P.G. Jonker at Radboud University <p.jonker@astro.ru.nl>

P. G. Jonker (Radboud Univ.), S. Littlefair (Sheffield Uni.), F. E. Bauer (PUC), A. J. Levan (Radboud Univ. & Warwick Univ.), D. B. Malesani (DAWN/NBI and Radboud Univ.), Maria E. Ravasio (Radboud Univ.), M.A.P. Torres (IAC), V. Dhillon (Sheffield Uni.), D. García Álvarez (GTC), A. M. García (GTC),  on behalf of a larger collaboration:

We observed the optical counterpart AT2024eju (Srivastav et al., GCN 35932) of the fast X-ray transient EP240315a reported by the Einstein Probe WXT instrument (Zhang et al., GCN 35931), using the GTC/HiPERCAM imager. We obtained 80 exposures of 30 seconds each in u’g’r’i’z’ simultaneously. The observations started at 21:10 UT on Mar 17, 2024. We clearly detected the source in the r’, i’, and z’ bands. 
The z’-band magnitude was 22 (AB mag). 

We acknowledge the excellent support from the GTC staff.