Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 399, Issue 1, Pages L113-L117Publisher
OXFORD UNIV PRESS
DOI: 10.1111/j.1745-3933.2009.00737.x
Keywords
gamma-rays: observations; X-rays: binaries; X-rays: individual: IGR J17544-2619
Categories
Funding
- European Community [ERC-StG-200911]
- STFC [ST/G003084/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/G003084/1] Funding Source: researchfish
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The supergiant fast X-ray transient (SFXT) system IGR J17544-2619 has displayed many large outbursts in the past and is considered an archetypal example of SFXTs. A search of the INTEGRAL/ISGRI data archive from MJD 52698-54354 has revealed 11 outbursts and timing analysis of the light curve identifies a period of 4.926 +/- 0.001 d which we interpret as the orbital period of the system. We find that large outbursts occasionally occur outside of periastron and place an upper limit for the radius of the supergiant of <23 R-circle dot.
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