TITLE: GCN CIRCULAR NUMBER: 36869 SUBJECT: EP-WXT flaring star and the optical flaring activity during its decay phase DATE: 24/07/15 13:34:00 GMT FROM: ipg@iaa.es I. Perez-Garcia, S.-Y. Wu, , E. Fernandez-Garcia, M. D. Caballero-Garcia, R. Sanchez-Ramirez, S. Guziy and A. J. Castro-Tirado (IAA-CSIC, Granada), C. Perez del Pulgar, A. Castellon (Univ. of Málaga), Y.-D. Hu (INAF-OAB, Brera), M. Gritsevich (Univ. of Helsinki), P. J. Meintjes and H. J. van Heerden (UFS, South Africa), A. Martin-Carrillo and L. Hanlon (UCD, Ireland), D. R. Xiong (Yunnan Observatories of CAS), B.-B. Zhang (Nanjing Univ.) and A. Maury (Space, San Pedro de Atacama), on behalf of a larger collaboration, report: Following the detection of an X-ray transient by Einstein Probe on June 14 (Zhang et al., GCN 36867), both the BOOTES-6/DPR and BOOTES-7 robotic telescopes at Boyden Observatory (South Africa) and Atacama Observatory (Chile) respectively, observed the transient location, starting on July 14 at 19:25 UT (i.e., 2.2 h after the trigger) and continued until July 15 at 09:10 UT. Images were gathered in different optical bands. We confirm the increase in the optical brightness of the star LP 820-19 (Jiang et al. GCN 36868), especially at shorter wavelengths, as expected from its flare star nature, with the largest drop (of 1.9 mag) in the Sloan g’-band filter. We also observe rapid increases in brightness of up 0.4 mag, which we attribute to a lower-energetic flaring activity during the decay phase. View this GCN Circular online at https://gcn.nasa.gov/circulars/36869. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...