NAME:
  gareabv
 PURPOSE:   (one line only)
  Determine B,V transformation from Gaia in a region 
 DESCRIPTION:
 CATEGORY:
  Photometry
 CALLING SEQUENCE:
  gareabv,ra,dec,bc,bcsig,vc,vcsig
 INPUTS:
  ra  - RA of area (radians)
  dec - Dec of area (radians)
 OPTIONAL INPUT PARAMETERS:
 KEYWORD INPUT PARAMETERS:
  hw - half-width of region in arsec, default = 1200
 OUTPUTS:
  bc - transformation for B
  bcsig - uncertainties on bc
  vc - transformation for V
  vcsig - uncertainties on vc
 KEYWORD OUTPUT PARAMETERS:
 CONFIGURATION:
 COMMON BLOCKS:
 SIDE EFFECTS:
 RESTRICTIONS:
 PROCEDURE:
 MODIFICATION HISTORY:
  Written by Marc W. Buie, Southwest Research Insitute, 2024/07/24