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Issue A&A
Volume 432, Number 1, March II 2005
Page(s) L13 - L16
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:200500011



A&A 432, L13-L16 (2005)
DOI: 10.1051/0004-6361:200500011

Letter

Discovery of the INTEGRAL X/ $\gamma$-ray transient IGR J00291+5934: A Comptonised accreting ms pulsar?

S. E. Shaw1, 2, N. Mowlavi2, 3, J. Rodriguez4, 2, P. Ubertini5, F. Capitanio5, K. Ebisawa6, 2, D. Eckert2, 3, T. J.-L. Courvoisier2, 3, N. Produit2, 3, R. Walter2, 3 and M. Falanga4

1  School of Physics and Astronomy, University of Southampton, SO17 1BJ, UK
2  INTEGRAL Science Data Centre, 1290 Versoix, Switzerland
    e-mail: simon.shaw@obs.unige.ch
3  Observatoire de Genève, 51 Chemin des Maillettes, 1290 Sauverny, Switzerland
4  CEA Saclay, DSM/DAPNIA/SAp (CNRS FRE 2591), 91191 Gif-sur-Yvette Cedex, France
5  Istituto di Astrofisica Spaziale, CNR/INAF, via Fosso del Cavaliere 100, 00133 Rome, Italy
6  NASA Goddard Space Flight Center, Code 661, Building 2, Greenbelt, MD 20771, USA

(Received 16 December 2004 / Accepted 23 January 2005 )

Abstract
We report the discovery of a high-energy transient with the IBIS/ISGRI detector on board the INTEGRAL observatory. The source, namely IGR J00291+5934 , was first detected on 2nd December 2004 in the routine monitoring of the IBIS/ISGRI 20-60 keV images. The observations were conducted during Galactic Plane Scans, which are a key part of the INTEGRAL Core Programme observations. After verifying the basic source behaviour, the discovery was announced on 3rd December. The transient shows a hard Comptonised spectrum, with peak energy release at about 20 keV and a total luminosity of ~ $0.9 \times 10^{36}$ erg s -1 in the 5-100 keV range, assuming a distance of 3 kpc. Following the INTEGRAL announcement of the discovery of IGR J00291+5934 , a number of observations were made by other instruments. We summarise the results of those observations and, together with the INTEGRAL data, identifiy IGR J00291+5934 as the 6th member of a class of accreting X-ray millisecond pulsars.


Key words: gamma-rays: observations -- pulsars: individual IGR J00291+5934

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