TITLE: GCN CIRCULAR NUMBER: 36327 SUBJECT: LIGO/Virgo/KAGRA S240422ed: BOOTES-6/DPRT optical upper limits for EP240426a DATE: 24/04/26 21:37:38 GMT FROM: Alberto Castro-Tirado at Inst.de Astro. de Andalucia ajct@iaa.es

|I. Perez-Garcia, E. Fernandez-Garcia, M.D. Caballero-Garcia, R. Sanchez-Ramirez, S. Guziy, S.-Y. Wu and A. J. Castro-Tirado (IAA-CSIC, Granada), P. J. Meintjes and H. J. van Heerden (UFS, South Africa), A. Martin-Carrillo and L. Hanlon (UCD, Ireland), M. Gritsevich (Univ. of Helsinki), |||D. R. Xiong (YNAO) |and C. J. Perez del Pulgar (UMA, Malaga), on behalf of a larger collaboration, report: |Following the detection of a possible X-ray counterpart for LIGO/Virgo/KAGRA S240422ed (LVK collaboration, GCNC 36236), the BOOTES-6/DPRT robotic telescope pointed to the location of EP240426a (discovered by EP-FXT, Sun et al. GCNC 36313) starting at Apr 26, 18:21 UT. No optical counterpart within an uncertainty of 10 arcsec in radius compared to the PanSTARRS DR1 image was found on a 1-hr coadd (60x60s) g'-band image, down to 20.3 mag. This is in agreement with previous reports by Wang et al. (GCNC 36315), Xiong et al. (GCNC 36320), Sun et al. (GCNC 36323) and Elhooseiny et al. (GCNC 36323). We note that the position center is only|5.5 arcsec away from the red galaxy 2MASX J08072584-2927344, which makes difficult the observation at longer wavelengths. We thank the staff at Boyden Observatory for their excellent support. |

View this GCN Circular online at https://gcn.nasa.gov/circulars/36327. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...