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INTEGRAL detection of a new outburst of A 0535+262

ATel #3173; C. Tchernin, C. Ferrigno, E. Bozzo (ISDC - Switzerland)
on 17 Feb 2011; 18:16 UT
Distributed as an Instant Email Notice Transients
Credential Certification: Carlo Ferrigno (Carlo.Ferrigno@unige.ch)

Subjects: X-ray, Neutron Star, Transient

Referred to by ATel #: 3198, 3204

During the on-going calibration observations of the Crab, INTEGRAL detected the Be X-ray binary A 0535+262 during a new bright X-ray outburst (see also Atel #3166).

The observations on which this telegram is based were performed from 2011 Feb. 16 at 11:50 to 2011 Feb. 17 at 15:55 (UTC). The source is detected at an average flux of 1.5 and 0.8 Crab in the 20-40 keV and 40-80 keV energy bands, respectively.

The IBIS/ISGRI lightcurve shows a remarkable increase in the count-rate, thus suggesting that the currently on-going event is probably another giant outburst from the source.

Further INTEGRAL observations of the region around A 0535+262 are currently planned until 2011 Feb. 19. Observations with other instruments are encouraged.