2011ATel.3263....1K

The INTEGRAL Galactic bulge (GB) monitoring program observations on UT April 6, 2011, 04:11-07:53 show that IGR J17464-3213 (= H1743-322) started another outburst. The observed JEM-X fluxes are 11 ± 2 and 26 ± 4 mCrab in the 3-10 and 10-25 keV energy bands, respectively, while the observed IBIS/ISGRI fluxes are 34 ± 2 and 57 ± 3 mCrab in the 18-40 and 40-100 keV energy bands, respectively. The source is clearly in a hard state. Previous GB observations (April 3, 15:13-19:21) did not reveal any significant emission, with JEM-X and IBIS/ISGRI upper limits of about 3 and 10 mCrab (5 sigma), respectively, in the above quoted energy bands. Swift/BAT observations indicate the outburst started around April 5. The source is also seen in the latest RXTE/PCA Galactic Center scan observations at April 6, 18:10: 15±1 mCrab (2-10 keV). The last outburst of this source was in Aug/Sep 2010 (ATels #2774, #2781, #2788, #2792, #2797, #2857). We encourage follow-up observations at all wavelengths.

<center> <a href="http://integral.esac.esa.int/BULGE/SOURCES/IGR_J17464-3213/IGR_J17464-3213.html">INTEGRAL Galactic bulge monitoring program light curve</a>

<a href="http://swift.gsfc.nasa.gov/docs/swift/results/transients/weak/IGRJ17464-3213/">Swift/BAT Hard X-ray Transient Monitor light curve</a>

<a href="http://lheawww.gsfc.nasa.gov/users/craigm/galscan/html/H1743-322.html">RXTE/PCA Galactic Center Observations light curve</a> </center>