Discovery of a New Soft Gamma Repeater, SGR 1627-41

Details Discovery of a New Soft Gamma Repeater, SGR 1627-41 Discovery of a New Soft Gamma Repeater, SGR 1627-41

1999-03-17

arxiv.org/abs/astro-ph/9903267v1

Astronomy and Astrophysics

Astrophysics

5 pages, 4 figures, submitted to ApJ Letters

Scientific paper

10.1086/312124

We report the discovery of a new soft gamma repeater (SGR), SGR 1627-41, and present BATSE observations of the burst emission and BeppoSAX NFI observations of the probable persistent X-ray counterpart to this SGR. All but one burst spectrum are well fit by an optically thin thermal bremsstrahlung (OTTB) model with kT values between 25 and 35 keV. The spectrum of the X-ray counterpart, SAX J1635.8-4736, is similar to that of other persistent SGR X-ray counterparts. We find weak evidence for a periodic signal at 6.41 s in the light curve for this source. Like other SGRs, this source appears to be associated with a young supernova remnant G337.0-0.1. Based upon the peak luminosities of bursts observed from this SGR, we find a lower limit on the dipole magnetic field of the neutron star B_dipole > 5 * 10^14 Gauss.

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