2. Observations and data reduction
Data from the Low-Energy Concentrator Spectrometer (LECS; 0.1-10 keV), Medium-Energy Concentrator Spectrometer (MECS; 1.3-10 keV) High Pressure Gas Scintillation Proportional Counter (HPGSPC; 5-120 keV) and the Phoswich Detection System (PDS; 15-300 keV) on-board BeppoSAX (Boella et al. 1997) are presented. All these instruments are co-aligned and collectively referred to as the Narrow Field Instruments, or NFI.
XTE J0421+560 was observed twice by BeppoSAX as a target of opportunity (TOO). TOO1 took place between 1998 April 3 05:03 and 17:44 and TOO2 between 1998 April 9 00:48 and April 10 06:49 UTC. The data were processed using the SAXDAS 1.3.0 package. The TOO1 exposures are 6.8, 21.5, 9.8, and 9.3 ks in the LECS, MECS, HPGSPC, and PDS, respectively. The corresponding count rates are 6.8, 12.7, 9.5, and 2.2 s-1. The TOO2 exposures are 10.7, 47.0, and 17.8 ks in the LECS, MECS, and HPGSPC. The corresponding count rates are 16.5, 0.8, and 0.2 s-1. LECS and MECS data were extracted centered on the position of XTE J0421+560 using radii of and , respectively. Background subtraction in the imaging instruments was performed using standard files, but is not critical for such a bright source. Background subtraction in the non-imaging instruments was carried out using data from offset intervals.
© European Southern Observatory (ESO) 1998
Online publication: November 9, 1998