SED Classifier

                Transforming SED magnitudes into Fluxes
                ***************************************

                         A.Micol [ST-ECF]
                             July 2004


Formulae applied to derive F(lambda) and its error Ferr
=======================================================

F    = ZP(band) * 10**(-0.4*Johnson_Mag)
Ferr = F * 0.4 * log(10) * Johnson_Mag_err

Note: For the zeropoints (ZP) see the zeropoints.txt attachment.



Formulae used to transform GSC2 magnitudes to Johnson Magnitudes
================================================================

Transformations derived by R.Mignani (July 2004).

GSC2_J to Johnson_B
-------------------

B = ( GSC2_J - q ) / m
Berr = ( GSC2_Jerr + qerr ) / m + ( GSC2_J - q ) * merr / m**2

where

m = 0.9683444 +- 0.0024978
q = 0.3948545 +- 0.0432


GSC2_V to Johnson_V
-------------------

V = ( GSC2_J - q ) / m
Verr = ( GSC2_Jerr + qerr ) / m + ( GSC2_J - q ) * merr / m**2

where

m = 0.9126545 +- 0.01889
q = 1.01393   +- 0.19794


GSC2_F to Johnson_R
-------------------

R = ( GSC2_J - q ) / m
Rerr = ( GSC2_Jerr + qerr ) / m + ( GSC2_J - q ) * merr / m**2

where

m = 0.973757 +- 0.006102
q = 0.375172 +- 0.101555