Optical follow-up of Mrk421
ATel #15390; Roberto Nesci (INAF/IAPS)
on 21 May 2022; 22:09 UT
Credential Certification: Roberto Nesci (roberto.nesci@inaf.it)
Subjects: Optical, AGN, Blazar
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. Four nearby comparison stars were taken from the UCAC4 catalog and aperture photometry was made with IRAF/apphot using a 6 arcsec radius. Mrk412 was detected at B=13.54 +-0.03 and V=13.10 +-0.04.
