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MODIFICATION OF GSPC CALIBRATION DATA

The new effective areas as given in EXPRESS No. 11, p.66 and the coefficients for the analytical expression for the burst length efficiency (same EXPRESS p.64) have been added to the GSPC CCF.


The new data reside in the newly defined data type EA which replaces data types E1, E2.


EA contains 84 pairs of energy/area (Ei/EAi) for burst length window open together with 5 energies EJ* and 13 coefficients P1j, P2j for the transformation to burst length windows 89-107 and 89-104.


Record 1:

Bytes
0-3 E1
4-7 EA1
8-11 E2
.
.
248-251 E32
252-255 EA32


Record 2:

Bytes
0-3 E33
4-7 EA33
8-11 E34
.
.
248-251 E64
252-255 EA64


Record 3:

Bytes
0-3 E65
4-7 EA65

8-11 E66
.
.
142-145 E84
146-149 EA84
150-255 spare


Record 4:

Bytes
0-3 E1*
4-7 E2*
8-11 E3*
12-15 E4*
16-19 E5*
20-23 spare
24-27 burst length window 1 lower limit
28-31 burst length window 2 upper limit
32-35 P11
36-39 scaling factor S11
40-43 P12
.
.
.
128-131 P113
132-135 S113
136-143 spare
144-147 burst length window 2 lower limit
148-151 burst length window 2 upper limit
152-155 P21
156-159 S21
.
.
.
248-251 P213
252-255 S213


Units:
Ei = 0.01 keV
EAi = 0.001 cm2
Ej* = 1.0 keV
P1, P2 = 0.001

The coefficients POL1, PO12 (subroutine GSAXE) are given by:
POL1J = P1J/10S1J
POL2J=P2J/10S2J
M. Gottwald

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