Spectroscopy of six optical candidates to unidentified INTEGRAL sources.

MASETTI, N.; MORELLI, L.; CELLONE, S. A.; BASSANI, L.; MALIZIA, A.; BAZZANO, A.; BIRD, A. J.; GALAZ, G.; ROMERO, G. E.; WALTER, R.

The Astronomer's Telegram

Año: 2007 p. 1 - 1

We obtained optical spectra of the putative counterparts of six unidentified INTEGRAL X-ray sources (Bird et al., astro-ph/0611493; Krivonos et al., astro-ph/0701836) using the BFOSC instrument of the 1.5m ´Cassini´ telescope of the Astronomical Observatory of Bologna in Loiano (Italy) on 13 Jan 2007, the R-C spectrograph of the CTIO 1.5m telescope in Cerro Tololo (Chile) on 18-19 Feb 2007, and the REOSC spectrograph of the 2.15m ´Jorge Sahade´ telescope at CASLEO (Argentina) on 10-11 Mar 2007.