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Astron. Astrophys. 357, 501-506 (2000)

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2. Observation

The Satellite for X-ray Astronomy BeppoSAXis described in detail in Boella et al. 1997a. It carries a pay-load of four co-aligned Narrow Field Instruments: the Low Energy Concentrator Spectrometer (LECS, 0.1-10 keV; Parmar et al. 1997), the Medium Energy Concentrator Spectrometers (MECS, 1.6-10 keV; Boella et al. 1997b), the High Pressure Gas Scintillation Proportional Counter (HPGSPC, 4-100 keV; Manzo et al. 1997) and the Phoswich Detector System (PDS, 15-200 keV; Frontera et al. 1997).

The LECS and MECS are imaging instruments with an angular resolution of [FORMULA]. The HPGSPC and PDS are collimated instruments with field of views (FOVs) of [FORMULA].

The BeppoSAXTarget Opportunity Observation Program of GS 1843+00 started at 1997 April 4 at 02:17 and ended at 15:00 UTC. Good data were selected from intervals when the instrument configurations were nominal and the elevation angle, with respect to the Earth Limb, was greater then [FORMULA]. The total on-source exposure times were 8.5 ks for the LECS, which is operated only during night time, 22 ks for the MECS, 9.7 for the HPGSPC and 7.4 ks for the PDS.

The MECS light curves and spectra have been extracted, following the standard procedure, from a circular region, centered on the source with a [FORMULA] radius, while a [FORMULA] radius was used for the LECS.

For both LECS and MECS, the background subtraction, was performed using the background obtained from a long blank sky observations, rescaled by a correction factor obtained as the ratio of the count rates extracted from both the blank sky and the GS 1843+00 images, in a region of the detector far from the source location. As far as concerns the two collimated instrument, HPGSPC and PDS, the background was subtracted using the standard procedure (Segreto et al. 1997; Frontera et al. 1997) that uses the rocking collimator technique.

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© European Southern Observatory (ESO) 2000

Online publication: June 5, 2000