Ginga Data

Only the LAC data are archived at present. LAC FRF (First Reduction Files) are archived, and put in the two directories. The two directories have different structures, but the FRFs are identical.

LAC FRF (First Reduction File)

All the LAC FRFs are archived at in a time-sequence manner. Under this directory, there are sub-directories named YYMM, where YY is the year (from 87 to 91) and MM is the month. Under each sub-directory, FRFs are put in the order of operation (date and orbits).

Target Oriented Data

When the target observation has corresponding background (blank) observation, the target data and background data are put in the same directory for convenience. They are found under Each directory has a name as YYMMddddd, where YY is the year (from 87 to 91), MM is the month, and ddddd is the last 5-digit of the sequence number (find the correspondence between the sequence number and the pass names). Note, all the observations do not have the corresponding blank sky observations. In such a case, you may use the "Hayashida-method" for background subtraction. For details see Chapter 5 of the ABC manual.

Under each observation directory, files are put in the directories listed below;

frf/ Telemetry files (FRFs; Wrapped FITS files)
lacdump/ LACDUMP files (ASCII files)
frf_bgd/ Telemetry files for recommended background data
lacdump_bgd/ LACDUMP files for recommended background data

Each dataset includes telemetry data (First Reduction File =FRF) and summary lists of the LAC housekeeping and attitude information (LACDUMP files). Each FRF is made per one satellite-operation pass (a contact or remote pass), while LACDUMP is per one day. These files are NOT divided at the times of maneuvers and therefore may contain data of previous and/or next targets as well as those during maneuvers. The recommended background data are simply selected from all the blank sky observations performed within 3 days. Before using them, however, users are strongly advised to check if they are really applicable for background subtraction in each case. Or you can search for appropriate background data utilizing the DARTS searching system; check the "Pattern Match" check-box, and enter "BGD" for the "TARGET_NAME" pattern.

Auxiliary Information

LAC dump, counting rates and other instrumental parameters as a function of time, is available.

Correspondence between the Sequence numbers and the pass names is found here.

The history file of the high-voltage (HV) level, the Coarse Gain, and the Fine Gain is provided, where the most frequent HV and Gain status is shown for each FRF.

Last Modified: 21 October 2015