Data Set Overview
=================
This dataset includes the Experimental Data Record (EDR) version of all
available images acquired by the BIRC starting from the second altitude
chamber test (ground calibration) through BRRISON flight until the
termination of flight activities of the BIRC. The images in this dataset
have not been processed in any way other than by decompressing, extracting
header information, and generating and attaching PDS labels. This dataset
also includes ancillary data files such as telescope pointing and
housekeeping information.

Images
=======
The BIRC images are split into three categories under the root DATA
directory. This was done because the BIRC flight software (FSW) was
undergoing modification at different stages between ground calibration and
flight.
The image files all follow the same naming convention.

Image file names follow the structure:
    YYMMDD_HHMMSS_NNN_F_XXX.FIT

    YYMMDD_HHMMSS are the two digit year, month, day, hour minute second
    while NNN is the three digit millisecond. This time corresponds to the
    timetag assigned to the source file by the BIRC FSW.

    F is the filter number used
    XXX is the exposure or image ID. A given observation may consist of
    several images, each tagged with an incrementing count of image ID,
    starting with ID=000. Images are taken in pairs, first with a 'bias'
    image at 3.58msec integration time followed by a 'signal' image at the
    commanded integration time. Even numbered images (starting at 000) are
    bias images, odd numbered images are the signal images. One can then do
    a bias subtraction by subtracting the bias image from the signal image.

The three image folders and their descriptions follow:

GROUNDCAL - contains the images acquired during ground calibration of the
    BIRC prior to integration with the gondola. Data are organized in
    YYYYMMDD folders below which are HH and MM folders, respectively.
    YYYYMMDD are the four digit year, 2 digit month, 2 digit day of month.
    HH and MM are the hour and minute. The date and times of the folders
    correspond to the date and time in the EDR filename.

QUICKLOOK - contains the images acquired during multiple hang tests at Fort
    Sumner whereby the gondola was suspended from an overhead crane while
    the telescope pointed out of the hanger at various sky targets. The data
    are organized similarly to GROUNDCAL except for the addition of a final
    subfolder after MM.

    The subfolder naming convention is '' where  is
    a designation of the intended target.  is a single character
    denoting whether the image was taken via manual commanding 'C' or as
    part of an automated operation sequence 'O'. For example, in the path
    /20130922/10/07/GEMINI1C/, GEMINI1 is the designation of the intended
    target and C denotes that the images in the subfolder were taken via
    manual command.

    Quicklook denotes that the data were downloaded via a 'quicklook' process
    whereby the image download takes precedence over all other telemetry.

SCIENCE - contains images acquired during the last day of the hang test at
    Fort Sumner and during the BRRISON flight. The data are organized in the
    same manner as those for quicklook in that the final subfolder denotes
    the target and whether the images were taken via manual command or
    automated operation.  The SCIENCE designation also indicates that the
    data were downloaded via a 'science down' process whereby the data were
    queued as part of normal telemetry downlink.

Housekeeping
============
Housekeeping and engineering data are extracted from the raw data files
created by the BIRC FSW and converted into EDRs which are contained in the
HOUSEKEEPING folder under the root DATA folder. Note that there is no
housekeeping data associated with the GROUNDCAL images since those were
taken prior to the integration of the BIRC with the gondola. Subfolders are
organized by YYYYMMDD followed by HH then '', where YYYYMMDD
and HH are the year month day and hour and the final subfolder is as
described previously in the image QUICKLOOK and SCIENCE folders.

Housekeeping file names follow the structure:
    YYMMDD_HHMMS_NNN_HK.TAB

    YYMMDD_HHMMSS are the two digit year, month, day, hour minute second;
    NNN is the three digit millisecond. This time corresponds to the timetag
    of the first record in the housekeeping file.

    HK denotes that this is a Housekeeping EDR.

There is also a single EDR at the same level as the YYYYMMDD folders, with a
filename of 'BRRISON_PENTHOUSE_TEMP.TAB'. This single EDR contains the
penthouse temperature data reported by the Gondola software. This data is
not passed on to the BIRC FSW and therefore is not contained within the
other housekeeping EDRs.

Pointing
========
Pointing and location data are extracted from the raw data files created by
the BIRC FSW and converted into EDRs which are contained in the POINTING
folder under the root DATA folder. Note that there is no pointing data
associated with the GROUNDCAL images since those were taken prior to the
integration of the BIRC with the gondola. Subfolders have the same
organization as described for the Housekeeping EDRs.

Pointing file names follow the structure:
    YYMMDD_HHMMS_NNN_P.TAB

    YYMMDD_HHMMSS are the two digit year, month, day, hour minute second
    while NNN is the three digit millisecond. This time corresponds to the
    timetag of the first record in the housekeeping file.
    P denotes that this is a Pointing EDR.

Unknown.  This data has not undergone an external review.