INTEGRAL detects renewed activity from SAX J2103.5+4545

ATel #6154; L. Ducci (ISDC, Switzerland), E. Jourdain (IRAP, France), J. Wilms (ECAP, Germany), E. Bozzo (ISDC, Switzerland)
on 21 May 2014; 11:48 UT
Distributed as an Instant Email Notice Transients
Credential Certification: E. Bozzo (enrico.bozzo@unige.ch)

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During the observation performed in the direction of Cyg X-1 on 2014 May 20 and 21, the imager IBIS (20 keV - 1 MeV) on-board INTEGRAL detected renewed activity from the transient X-ray pulsar SAX J2103.5+4545.

The source was detected in the IBIS/ISGRI mosaic at a significance level of 17 (8) sigma and a flux of 49+/-3 mCrab (27+/-3 mCrab) in the 20-40 keV (40-80 keV) energy band.

The average ISGRI spectrum (effective exposure time 31.6 ks) could be well described (chi^2_red/d.o.f.=1.0/8) by a power-law with photon index 2.8+/-0.3. The estimated flux from the spectral fit was 6.3E-10 erg/cm^2/s (20-100 keV).

The source was outside the JEM-X (3-30 keV) field of view.

The new X-ray outburst from SAX J2103.5+4545 was expected owing to the recently reported optical brightening of the source (Atel #6019).

Further INTEGRAL observations in the direction of SAX J2103.5+4545 are planned on 2014 May 31.