OGLE-IV Galactic bulge fields - uncertainties correction coeficients

(March 2016, J. Skowron)

Errorbar correction procedure:

  INPUT: (mag, error) AND COEFFICIENTS FOR THE GIVEN FIELD.CHIP: (GAMMA, EPSILON, UNIT, BACKG, MAG_01)
  if error > 0.003:
    new_error = sqrt( (GAMMA*error)^2 + EPSILON^2 )
  else:
    F = 10^(0.4*(UNIT - mag))
    B = 10^(0.4*(UNIT - BACKG))
    FLUX_NOISE = sqrt(F + B)
    MAG_NOISE = 2.5/ln(10) * FLUX_NOISE/F
    new_error = max( error, sqrt( (GAMMA*MAG_NOISE)^2 + EPSILON^2 ) , 0.01 * 10^( 0.6*(MAG_01 - mag) ) )
  end
  RETURN (mag, new_error)

Tables of coeficients for uncertainty-correction procedure:

Appendix A in PDF:

Download Data directory: