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INTEGRAL non detection of renewed activity from Terzan 5

ATel #3718; I. Vovk (ISDC, Switzerland), E. Kuulkers (ESA/ESAC, Spain), J. Chenevez (DTU Space, Denmark), E. Bozzo (ISDC, Switzerland), on behalf of the INTEGRAL Galactic Bulge Monitoring group,
on 27 Oct 2011; 10:37 UT
Credential Certification: E. Bozzo (enrico.bozzo@unige.ch)

Subjects: X-ray, Neutron Star, Transient

Referred to by ATel #: 3720, 3729, 3743

The Globular Cluster Terzan5, was observed by the IBIS/ISGRI and JEM-X instruments on-board INTEGRAL during the Galactic Bulge monitoring program (ATel #438) from 2011 October 25 at 17:15 to 2011 October 25 at 20:56 (UTC).

No significant X-ray emission was detected in the direction of the Globular Cluster. From the JEM-X mosaic, we estimated a 5 sigma upper limit of 6 mCrab in the 3-10 keV energy band (effective exposure time 5.2 ks). The 5 sigma upper limit in the 20-40 keV energy band derived from the IBIS/ISGRI data was of 11 mCrab (effective exposure 12 ks).

The INTEGRAL observations took place about 8 hours before the RXTE detection reported in Atel #3714, and thus probably just before the onset of renewed activity.

Due to Sun visibility constraints, no other INTEGRAL observations in the direction of Terzan 5 are planned for the next months.