These sensitivity have been estimated from spectroscopic standard stars observation with 2.0" width slit, 3 pixels binning in spatial direction and 2 pixels binning in dispersion direction. So 'pix' described below means a 2-binned pixel.
Memo: AB mag=-2.5 log [f_lambda(erg cm^-2 A^-1 s^-1)]
-5.0 log [lambda (A)] -2.41
Dispersion is given after 2 pixel binning in wavelength direction.
2.6 angstrom/pix for 300/mm, 1st order
5.2 angstrom/pix for 150/mm, first order.
Unit used here is
count/pix/exptime
------------------
{erg cm^-2 A^-1 s^-1}
e.g., 1E16 means that you will get 1 count/pix per 1 sec exposure when you observe an object with 1e-16 (erg cm^-2 A^-1 s^-1).
2.6 Angstrom/pix
Red: B300 + Y47 +1st order
White (short wavelength): B300 + L600 + 1st order
White (long wavelength): R300 + O58 + 1st order
Light blue: R300 + Y47 + 1st order
Blue: B300 + C50 + 1st order
Green: 150 + C50 + 2nd order
Red: 150 + Y47 +1st order
Blue: 150 + C50 + 1st order
White: 75 + C50 + 2nd order
Green: 75 + L600 + 2nd order