PDS_VERSION_ID        = PDS3
RECORD_TYPE           = STREAM
OBJECT                = TEXT
  INTERCHANGE_FORMAT    = ASCII
  PUBLICATION_DATE      = 2013-10-11
  NOTE                  = "Description of contents of CALIB directory"
END_OBJECT            = TEXT
END

The CALIB directory contains the following files.

CALINFO.TXT: Description of calibration directory files.

GRAILCOMPONENTS.LBL: PDS label that describes GRAILCOMPONENTS.TXT.

GRAILCOMPONENTS.TXT: Abstract of a paper describing the spacecraft bus 
component model with dimensions and orientations, as well as the 
specular/diffuse reflectivity properties of the spacecraft components. 

Fahnestock, E.G., R.S. Park, D. Yuan, and A.S. Konopliv, Spacecraft
Thermal And Optical Modeling Impacts on Estimation Of The GRAIL Lunar
Gravity Field, AIAA/AAS Astrodynamics Specialist Conference, Minneapolis,
Minnesota, 13-16 August 2012, DOI: 10.2514/6.2012-4428.

The full paper can be found on the web:
http://arc.aiaa.org/doi/pdf/10.2514/6.2012-4428
A subscription is required unless accessed via JPL.

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Some information, which might be thought of as calibration data, is archived 
as Level 0 data in the LGRS EDR data set.