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INTEGRAL Campaign on GX 339-4

ATEL # 980; J. M. Miller (Univ. of Michigan), E. Kuulkers (ESA/ESAC), M. D. Caballero-Garcia (LAEFF/INTA), M. Diaz Trigo (ESA/ESAC), on behalf of a larger collaboation
on 25 Jan 2007; 17:09 UT
Password Certification: Jon Miller (jonmm@umich.edu)

Subjects: Radio, Infra-Red, X-ray, Gamma Ray, Request for Observations, Binaries, Black Holes

The transient black hole binary GX 339-4 is currently in outburst, and slowly rising in both soft and hard X-rays. On Jan 23, 2007 (MJD 54123), the RXTE/ASM recorded a flux of 12.1 cts/sec, which corresponds to 166 mCrab (2-12 keV). On Jan 21, 2007 (MJD 54121) the source flux was 0.096 cts/sec in the Swift/BAT 15-50 keV band, or 417 mCrab (Swift/BAT transient monitor results provided by the Swift/BAT team; see Krimm et al. 2006 ATEL 904).

The source has met our team's trigger criteria for INTEGRAL observations. The first observation is scheduled to start at 2007-01-30 (MJD 54130) at 15:56:59.0. In total, six observations of 130 ksec (each spaced by two weeks) will be performed in the coming months. The data will be made public immediately. Contemporaneous radio and IR observations are particularly encouraged.

Our team will make every effort to quickly communicate the results of these observations through ATELs, concerning both GX 339-4 and sources in the FOV. We request that those using the data independently acknowledge our team by citing this ATEL and Caballero-Garcia et al. (2007, in prep.).


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