Version 10.1 of the ISO Off-Line Processing (OLP) software released on 20 November 2001

Version 10.1 of the automated Offline Processing Software (including CAL-G 7.1) has been released to improve the quality of SWS and LWS version 10.0 products (the release of OLP 10.0 was announced on June 8, 2001). This affected aspects of all SWS observations, and aspects of all LWS observations performed before revolution 237. Advantage was taken with this release to recover products of a dozen PHT sparse maps observations, fixing a minor technical bug in the software. All these changes are confined to specific items. Users having retrieved OLP 10 data of these instruments should follow the recommendations listed in the explanatory sections below to know whether new products should now be retrieved or not (via the default setting "Latest available processing" in the ISO Data Archive).

All ISO telemetry have already been reprocessed with the legacy version 10 of the pipeline software. After reprocessing the observations affected by these latest changes, the ISO Data Archive will be repopulated with the latest version of the products.

As outlined in the OLP10 release note, during ISO's Active Archive Phase, effort will be invested to augment the archive content for many observations by ingestion of products which become available through interactive or specialised processing of subsets of the ISO data. The ISO Data Archive will continue to be improved in terms of both its user friendliness, and the immediacy with which products can be taken and used.

Alberto Salama (IDC Vilspa)

SWS OLP 10.1 improvements

The STARTYPE group led by S.D. Price at the Air Force Research Laboratory has found spurious features present in their SWS observations of early type stars. Two broad and prominent features (~5%) occur between 4 and 6 µm and 7 and 12 µm. Analysis has shown that at least part of these features can be explained by sytematic errors in the calibration caused by deficiencies in the synthetic spectra used for the RSRF and absolute flux calibration. All SWS spectra produced from Off Line Reprocessing OLP 10 are affected by this calibration problem. The OLP 10 products have been publicly available since June 8th of 2001 but available in the SWS Interactive Analysis software since November 2000.

Thanks to the input of the STARTYPE group and the ISO Data Center (IDC), the SWS team was able to correct the problem and include the correction in the final ISO archive. We encourage all users of SWS OLP 10 products to review the note "Improvements in the OLP 10 RSRF and Flux Calibration of ISO-SWS Bands 2A and 2C" and assess the impact on their data.

Russell F. Shipman (DIDAC) & Bart Vandenbussche (KUL)

LWS OLP 10.1 improvements

OLP 10.1 includes the following change for LWS:

The reference photo-current value has been corrected in the LCIR file for detector SW1 for all observations performed with type 1 illuminator flashes, i.e. all observations taken before revolution 237.

This change has been prompted by the discovery that for observations performed before revolution 237, the SW1 fluxes were systematically too low by a factor 20-25 % relatively to both the fluxes measured on the detector SW2 and the fluxes predicted by models. The present correction of the LCIR file now provides good agreement.

The change included in OLP10.1 affects only detector SW1, and only observations performed before revolution 237.

Cecile Gry (IDC Vilspa)
Pedro Garcia-Lario (IDC Vilspa)
Thomas Mueller (IDC Vilspa)
Tanya Lim (UK ISO Data Centre at Rutherford Appleton Laboratory)

PHT OLP 10.1 improvements

OLP 10.1 for PHT provides fixes to failures in the OLP 10.0 processing for a dozen of observations. Therefore prior to these fixes, only the completeness of the archive and not the quality of the data products was affected. The observations now available in the archive are:

 - PHT-P sparse map observations with more than a total of 14 measurements.

 - PHT-P raster observation 66101025.

Phil Richards (UK ISO Data Centre at Rutherford Appleton Laboratory)