INTEGRAL observations of Mrk 421

Details INTEGRAL observations of Mrk 421 INTEGRAL observations of Mrk 421

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008atel.1507....1p&link_type=abstract

The Astronomer's Telegram, #1507

Astronomy and Astrophysics

Astronomy

X-Ray, Gamma Ray, Agn

Scientific paper

Following the observation of intense flaring at TeV energies by the VERITAS Cherenkov telescopes (later announced in Swordy et al. 2008, Atel #1506), a TOO observation of the blazar Mrk 421 by INTEGRAL was triggered on 2 May 2008. Observations started the same day at 21:29 h UTC during INTEGRAL revolution 678. The observations are ongoing and scheduled to continue until 7 May 2008. From the first 31 ks of data, we extract the following information about Mrk 421: At 3-20 keV, the JEM-X1 data (25 ks of effective exposure time) are well represented by a single power law model with photon index 3.0+-0.1 (reduced chi-squared is 1.06 for 122 degrees of freedom).

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