ATel 15390: Optical follow-up of Mrk421 https://www.astronomer | Astronomical Informant

ATel 15390: Optical follow-up of Mrk421
https://www.astronomerstelegram.org/?read=15390

After the announcement in ATel #15389 of a flaring activity in Gamma rays of Mrk 421 I observed the source on May 21 2021 with the 30cm telescope of the Foligno Observatory (K56) in the B and V (Johnson) bands. ...