Optical Monitoring of Blazars at Bordeaux Observatory

Details Optical Monitoring of Blazars at Bordeaux Observatory Optical Monitoring of Blazars at Bordeaux Observatory

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sf2a.conf..425c&link_type=abstract

SF2A-2004: Semaine de l'Astrophysique Francaise, meeting held in Paris, France, June 14-18, 2004. Edited by F. Combes, D. Barret

Astronomy and Astrophysics

Astrophysics

1

Scientific paper

Several blazars, among which the TeV-emitting gamma-ray sources Mkn 421 and Mkn 501, have been monitored in the optical band since 1998 at Bordeaux Observatory. The observations are carried out in automatic mode using the CCD meridian instrument, hence providing measurements every night if weather permits. The precision of the data ranges from about 0.02 mag for objects with magnitude 12-13 to 0.1 mag for objects with magnitude 16. The absolute calibration is derived by observing 300-400 reference stars every night. We present the multi-year light curves obtained from this monitoring and discuss the variability of the sources.

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