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1. Introduction

This note is intended to communicate to all SWS users the nature of changes to the SWS calibration delivered to the IDC on 6-11-2001. Given that OLP10 is the last processing of the entire archive at the IDC, it is important to layout all reasons for last minute changes to the calibration.

In this note we describe the problem present in the OLP10 calibration and the changes that are made to correct this problem. We also provide our analysis of the problem which indicates how it is introduced into the calibration. This results in changes to the Relative Spectral Response Function (RSRF) for bands 2A and 2C and a change in the absolute photometric calibration of band 2A. We also discuss the choice of models used for the calibration. Finally, we present a verification of the new calibration and an indication of the role memory effects and satellite mis-pointings still play in the overall calibration of SWS.

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Improvements in the OLP 10 RSRF and Flux Calibration of ISO-SWS Bands 2A and 2C