INTEGRAL non detection of renewed activity from Terzan 5

I. Vovk, E. Kuulkers, Jérôme Chenevez, E. Bozzo

Research output: Contribution to journalJournal articleResearch


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.
Original languageEnglish
JournalThe Astronomer's telegram
Pages (from-to)#3718
Publication statusPublished - 2011


  • Transient
  • Neutron Star
  • X-ray

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