TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2965 SUBJECT: CFHTLS optical transient unlikely to be a GRB DATE: 05/01/19 22:03:53 GMT FROM: Paul Price at IfA,UH P.A. Price (Institute for Astronomy, University of Hawaii) reports: Inspection of archival 2MASS images reveals detection of a source coincident with the position of the transient detected by Malacrino et al. (GCN #2964) in the CFHTLS. The source is detected at 4-sigma significance in the J-band, and 2-sigma in the H-band. Rough photometry yields: J ~ 17.3 mag, H ~ 16.5 mag, K > 16.1 mag (3 sigma limit). The J-H colour of this (presumably quiescent) source is consistent with that of an M dwarf. These observations suggest that the source is likely a flaring M star. This message may be cited.