03-Nov-2008	RMK

This directory contains version 2 of the GBM DRM database. It is meant
to be used for routine science processing of GBM data. Note the
following configuration:

1) The simulation software, mass models, and calibration parameters
   used to generate this database reflect current best products. 

   a. Generated using GRESS version 1.2.0 software

   b. Mass model GlastFlightSC_v1_23.ggdml
      i. BGO -/+ X-axis locations corrected by moving 10-cm further from SC
      ii. Changes to SC model resulting from analysis of Source Survey
           - Lower density LAT radiator panels
           - Lower density SC body ("shear") panels
           - Several other smaller changes

   c. Energy resolution broadening version 1.02 calibration files

2) The database contains DRMs for a grid of 272 viewing directions.

3) Each DRM contains response data captured from 1.35e7 photons per
   incident energy starting on a sphere surrounding the central GLAST
   SC, excluding most of the solar panels.

4) Each DRM consists of a 64x70 matrix. The definition of 70 incident
   photon energies is different for NaI and BGO DRMs. The 64 measured
   energy bins are also different for NaI and BGO. The measured energies
   are binned as follows:

   COMPRESSED (DEFAULT FOR ALL FUTURE DRM DATABASES) wherein the
   measured energy bins use a compressed energy scale designed to
   facilitate accurate interpolation/integration. The exact
   compression scheme should be considered a test configuration at
   this point. Format follows GS-008

   - NOTE: Incident energy grid differs from previous DRM database
   releases (more points and slightly different grid sampling)

5) The .rsp FITS file formats and naming conventions adhere to the
   latest revision of the GS-008 "Compressed Leaf File" standard.

Database file structure :

(Note the detector naming/numbering scheme!!! This is the same
scheme embedded in each of the constitutent .drm FITS files)

GBMDRMdb002/        == Top level directory
      GBMDRMdb002_readme == This file
      NAI_00/         == Contains all .rsp DRM files for NAI detector #0
      NAI_01/         == Contains all .rsp DRM files for NAI detector #1
      NAI_02/         == Contains all .rsp DRM files for NAI detector #2
      NAI_03/         == Contains all .rsp DRM files for NAI detector #3
      NAI_04/         == Contains all .rsp DRM files for NAI detector #4
      NAI_05/         == Contains all .rsp DRM files for NAI detector #5
      NAI_06/         == Contains all .rsp DRM files for NAI detector #6
      NAI_07/         == Contains all .rsp DRM files for NAI detector #7
      NAI_08/         == Contains all .rsp DRM files for NAI detector #8
      NAI_09/         == Contains all .rsp DRM files for NAI detector #9
      NAI_10/         == Contains all .rsp DRM files for NAI detector #10
      NAI_11/         == Contains all .rsp DRM files for NAI detector #11
      BGO_00/         == Contains all .rsp DRM files for NAI detector #0
      BGO_01/         == Contains all .rsp DRM files for NAI detector #1

Each detector directory above contains 272 .rsp DRM FITS files, one
for each of the 272 different source directions. Each file is named
with the following scheme specified in GS-008:

glg_leaf_n#_z######_az#######_v10.rsp

where

n# = detector ID; 'n' = NAI, 'b' = BGO, detector number # follows IN HEX

z###### is the zenith angle in spacecraft coordinates, millidegrees
of the source direction for this DRM and 

az###### is the azimuth angle in spacecraft coordinates, millidegrees
of the source direction for this DRM.

v10 = .rsp file format version (10 = 1.0)

--eof