Identification of 2 INTEGRAL sources via Swift/XRT plus CASLEO followup.

MASETTI, N.; CELLONE, S. A.; LANDI, R.; PALAZZI, E.; STEPHEN, J. B.; DEAN, A. J.; MINNITI, D.; ROMERO, G. E.; UBERTINI, P.; GEHRELS, N.; BURROWS, D.

The Astronomer's Telegram

Año: 2007 p. 1 - 1

For the purpose of the identification of their nature, we selected 2 unidentified INTEGRAL sources from the 3rd IBIS catalogue (Bird et al., APJS in press, astro-ph/0611493; see also Keek et al., ATel #810). We selected those which had also been observed with the XRT instrument onboard Swift, thereby giving an arcsec-sized X-ray error box (see http://www.asdc.asi.it ) so to ease the localization of the optical counterpart (see Masetti et al. 2006, A&A, 459, 21 and references therein for details on this procedure). We then obtained optical spectroscopy on 2007 March 10-11 with the REOSC spectrograph of the 2.15m ´Jorge Sahade´ telescope at CASLEO (Argentina). The total exposure time was 60 minutes for each object.