Multiwavelength Observations of Markarian 421

Details Multiwavelength Observations of Markarian 421 Multiwavelength Observations of Markarian 421

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc....7.2691j&link_type=abstract

Proceedings of the 27th International Cosmic Ray Conference. 07-15 August, 2001. Hamburg, Germany. Under the auspices of the Int

Physics

2

Scientific paper

We report results from multiwavelength observations of the BL Lac Mrk 421 during the period March 18, 2001 to April 1, 2001 with the Whipple Gamma-Ray Observatory, the Whipple Observatory's 1.2 m optical telescope, the newly completed 0.5 m Antipodal Transient Observatory (ATO) telescope, and with the RXTE PCA detector. To better sample the extremely rapid variability of Mrk421, this campaign included the highest temporal density X-ray observations possible with a nearly continuous >330 ks exposure with RXTE (Fossati et al., 2001). Numerous ground-based atmospheric Cherenkov and optical observations were scheduled during this period to improve longitudinal/temporal coverage. A preliminary analysis of a subset of these data are presented here. Frequent correlated hour-scale X-ray and gamma-ray flares were observed. Dramatic intra-day optical variability was also observed, although the temporal correlation is unclear.

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