Free access article

A&A 386, 531-534 (2002)
DOI: 10.1051/0004-6361:20020223

XMM-Newton observation of the bursting pulsar GRO J1744-28 in quiescence

F. Daigne¹, P. Goldoni¹, P. Ferrando¹, A. Goldwurm¹, A. Decourchelle¹ and R. S. Warwick<sup>2

1</sup>  CEA/DSM/DAPNIA, Service d'Astrophysique, C.E. Saclay, 91191 Gif-sur-Yvette Cedex, France
²  Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH, UK

(Received 12 December 2001 / Accepted 11 February 2002)

Abstract
The XMM-Newton X-ray observatory performed a pointed observation of the bursting pulsar GRO J1744-28 in April 2001 for about 10 ks during a program devoted to the scan of the Galactic center region. After the discovery of this source by BATSE in December 1995 during a very active bursting phase, it has been in quiescence since April 1997. We present here the first detection of GRO J1744-28 in its quiescent state at a position which is consistent with previous high-energy positions (but not consistent with a proposed IR counterpart). The observed luminosity of the source in quiescence is about 6 orders of magnitude weaker than the luminosity in outburst.

Key words: pulsars: individual: GRO J1744-28 -- stars: neutron -- X-rays: bursts

Offprint request: F. Daigne, daigne@discovery.saclay.cea.fr

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