High Enerygy Outburst in BL Lac object Mkn 421
Abstract
Following the detection of enhanced X-ray emission from the BL Lac object Markarian 421 with the RXTE All Sky Monitor on, observations with the Cherenkov telescopes of HEGRA (La Palma, Canary Islands, Spain) show very strong TeV activity. Above a threshold energy of 500 GeV, daily integrated fluxes (20 minute averages) reach up to 1, 4, 2, 1.5, 2.5, and 3 times the TeV flux of the Crab Nebula in consecutive nights during January 16-22.
- Publication:
-
The Astronomer's Telegram
- Pub Date:
- January 2001
- Bibcode:
- 2001ATel...65....1R
- Keywords:
-
- X-ray;
- >GeV;
- AGN