GEMINI (Jan2001) Gemini IRAF package v1.1 GEMINI (Jan2001) Release date: January 29, 2001 This document describes the revisions relative to the Gemini IRAF package v1.0 PRIMARY REVISIONS: 1) Tasks for reduction of OSCIR data. A new package "oscir" is included. 2) Smaller bug fixes in the "quirc" package. 3) Smaller bug fixes in the task gemtools.imcoadd. DETAILS OF THE REVISIONS: oscir.oflat oscir.oreduce oscir.oscirinfo A new package "oscir" is released. Basic tasks to derive flat fields (oflat) and combine the images from the different chop and nod positions (oreduce) are included. A description of the OSCIR data format and how to reduce OSCIR data is available as the task "oscirinfo". quirc Various typographical errors in the help files have been fixed. quirc.qfastsky A warning regarding differences in exposure time is now only issued if the exposure times differ with more than 0.1 sec. The QUIRC controller often causes exposure time differences less than 0.1 sec for exposures with identical requested exposure time. The small differences have no implications for the reduction of the data. quirc.qsky In the old version size of the derived masks was hard-wired to 1024 pixels x 1024 pixels. In the new version the required size is read from the headers of the input images. A bug that caused the task crash to if no objects were found has been fixed. The determination of the FWHM using the task gemtools.gemseeing has been improved, especially for cases where FWHM > qsky.rebin. Improved error trapping for unallowed parameters values. quirc.qflat In the previous version, the task would start looking for the normalization constant within a fixed range. While appropriate for QUIRC data, if this task were used on data in which the median data value exceeded the usual QUIRC data range, the task would never find an appropriate normalization value and the resulting flat field image would not be properly normalized. This has now been fixed so that the task now looks for the normalization constant starting in the range defined by thresh_flo and thresh_fup. The default value for thresh_fup has been changed from 30000. to 40000. A warning regarding differences in exposure time is now only issued if the exposure times differ with more than 0.1 sec. The QUIRC controller often causes exposure time differences less than 0.1 sec for exposures with identical requested exposure time. The small differences have no implications for the reduction of the data. Improved error trapping for unallowed parameter values. Parameter names combine, reject and expname changed to combtype, rejtype and key_exptime, respectively. This makes the parameter names consistent with those used by qsky and qfastsky. quirc.qreduce If any of the parameters filteri (i=1,6) are set to identical values, the first existing flat field that matches the filter header keyword is used. For example, if filter1="Kp" and filter2="Kp", then flatimage1 is used for the filter Kp, if that image exists. If flatimagei=="", the filter defined by the matching parameter filteri is ignored. Improved error trapping for unallowed parameter values. gemtools.gemqa The value "unknown" is now allowed as the value for the data quality assessment keywords FINALINT, FINALIQ, PICONFIG, PITARGET. gemtools.gemseeing Corrected entries in gemseing.dat are provided for Hokupaa+QUIRC and OSCIR. The entries in v1.0 contained slightly incorrect pixel scales for the two instruments. gemtools.imcoadd The default value parameter "instscale" has been changed from 1.6 to 1.611444 The new version of the task has an improved handling of multiple occurrences of same object in the coordinate files. A warning message from "tinfo" about an empty table of objects has been removed - the case is handled by "imcoadd" as a case of no objects in common. The flagging of cosmic-ray events occasionally caused a floating point overflow fault. This problem has been resolved.