ZERO POINT FOR SPECTROSCOPY (Jul99).

These values were taken under non-photometric conditions. This is  only an stimation.
 
Standard
Band
Mag
it(s)
ZP
SNR/pixel
fs27
Km
13.12
40
21.65
15.16
fs25
Km
9.73
40
22.41
121.7
fs29
K
13.35
40
21.31
9.24
fs30
K
12.02
40
21.43
76.41
fs27
H
13.18
35
21.52
28.7
fs2
H
10.50
10
22.14
288.3
fs29
J
13.17
40
20.74
13.5

The magnitudes correspond for each band.

These result were obtained in non-photometric night, with clouds. These zero point are smaller than the ones obtained for imaging. This is because some light is mising in the grism, and then the flux is less, and zero point smaller.

The results for H-Band, are very similar, due to photometric conditions during the acquisition time. The differences between all the other bands are due to bad weather conditions.

These are the averages for each band:
 
Band
Zero Point
Km
22.03±0.4
K
21.37±0.1
H
21.83±0.3
J
20.74