TITLE: GCN CIRCULAR NUMBER: 45015 SUBJECT: GRB 260619A: NOT optical observations DATE: 26/06/20 13:36:17 GMT FROM: Daniele Bjørn Malesani at Cosmic Dawn Center, Niels Bohr Institute <daniele.malesani@nbi.ku.dk> D. B. Malesani (DAWN/NBI and Radboud), A. Martin-Carrillo (UCD), A. Saccardi (CEA/Irfu), G. Corcoran (UCD), B. Schneider (LAM), report on behalf of a larger collaboration: We observed the optical afterglow (Ducoin et al., GCN 44999; Li et al., GCN 45003; He et al., GCN 45008) of the SVOM GRB 260619A (Goto et al., GCN 44985) using the Nordic Optical Telescope (NOT) equipped with the ALFOSC camera. Observations were carried out in the SDSS i band and consisted of 4x300 s exposures. The optical afterglow is detected with an AB magnitude i = 22.26 +- 0.08 at the mean epoch Jun 20.207 UT (1.114 days after trigger), calibrated against nearby stars from the Pan-STARRS catalog, and not corrected for Galactic extinction. We note that our measurement indicates little evolution of the counterpart brightness compared to previously reported flux values. We encourage further follow-up to better understand the nature of this object. View this GCN Circular online at https://gcn.nasa.gov/circulars/45015. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...