Observations of Mkn 501 with the stereoscopic HEGRA IACT system during 14 days in March and April 1997 showed a -ray flux at a level of about one half to six times the Crab flux. The energy spectrum is comparable to that of the Crab Nebula, and extends up to at least 10 TeV. The flux level was studied on time scales between as short as 5 min and days. On a day to day scale an increase of the flux by a factor of up to 4 could be observed. On sub-hour time scales the data are statistically consistent with a constant flux. The observations with all 6 HEGRA telescopes are still continued. The results will be published elsewhere.
© European Southern Observatory (ESO) 1997
Online publication: April 6, 1998