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Astron. Astrophys. 364, 450-454 (2000)

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2. Observations

VHE gamma ray observations were made with the Mark 6 telescope (Armstrong et al. 1999) on clear moonless nights. The telescope has an energy threshold of about 300 GeV for observations at the zenith. Data were taken in our normal off-on-on-off mode where a half-hour on-source observation is bracketed by two 15-minute off-source observations which are at the source position displaced by [FORMULA] minutes in RA. Data were subjected to our normal quality control procedures and processed following the criteria used for our detection of VHE emission from PKS 2155-304 (Chadwick et al. 1999).

After quality control, our dataset for PKS 0548-322 consists of 105 fifteen minute on-source segments spread over 23 nights of observation. The dataset for PKS 2005-489 consists of 280 on-source fifteen minute data segments spread over 58 nights. An observation log is given in Table A.1. The PKS 2005-489 data in 1998 October were taken during a multiwavelength campaign.

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© European Southern Observatory (ESO) 2000

Online publication: January 29, 2001