New Enhanced Activity of Mrk 421 measured by HAWC
ATel #13875; Jose Andres Garcia-Gonzalez (IF-UNAM, jagarcia@fisica. unam. mx, ITESM-EIC, anteus79@tec. mx), Israel Martinez (UMD, imc@umd. edu) on behalf of the HAWC Collaboration
on 18 Jul 2020; 03:52 UT
Credential Certification: José Andrés GarcÃÂa-González (jagarcia@fisica.unam.mx)
Subjects: Gamma Ray, TeV, AGN, Blazar
In the past night the HAWC gamma-ray observatory has observed an increased TeV gamma-ray emission from Markarian 421, with a flux above 1 TeV of (8.91 +/- 1.10) X 10^-11 cm^-2s^-1 (~ 5 equivalent Crab units) between 2020-07-17 8:42:07 and 2020-07-18 00:58:05 UTC.
This new increase in the integrated flux has been preceded for an extended period of high activity that lasted from Jun 14th to Jun 21th (see for ref. #Atel 13808, #Atel 13831).
HAWC continuously monitors this source and will keep reporting in case that the enhance activity follows. Follow-up observations are encouraged.
All flux values are obtained from a maximum likelihood fit under the assumption of a fixed spectral shape with power law index of 2.2 and exponential cut-off at 5 TeV. The HAWC contact people for this analysis are Jose Andres Garcia-Gonzalez (IF-UNAM, jagarcia@fisica.unam.mx, ITESM-EIC, anteus79@tec.mx) and Israel Martinez (UMD, imc@umd.edu).
HAWC is a TeV gamma ray water Cherenkov array located in the state of Puebla, Mexico, that monitors two thirds of the sky every day with an instantaneous field of view of ~2 sr.
