The black hole candidate IGR J17091-3624 is still active

In February 2011 the black hole candidate IGR J17091-3624 went into outburst (detected by Swift/BAT, see ATEL #3144). During this outburst IGR J17091-3624 exhibited strong and highly-structured X-ray variability (e.g. Altamirano et al. 2011, ApJL, 742, 17, and references therein) which so far had only been observed from the very-bright black hole X-ray transient GRS 1915+105. This 2011 outburst of IGR J17091-3624 has been studied using many multi-wavelength observations (ATEL #3148, #3150, #3159, #3167, #3168, #3179, #3203, #3225, #3229, #3230, #3232, #3266, #3299, #3913, #3916, #4173, #4282, #4283, #4360) except during the December-January periods, when sun constraints do not allow further observations to be performed.