MODIFICATION OF GSPC CCF
A history of the GSPC background is added to the GSPC CCF. The evolution of the
background is given by 6 standard background spectra for individual periods from
1983-1986. The background spectra reside in the newly defined data type HB which
consists of 20 records. For the moment only-the first 12 records are used.
Each background spectrum covers 2 records. Within a record, each pair of bytes
gives the count rate in counts/1000 sec per energy channel in the corresponding
channel. The accumulation time of the spectrum is given in the last 2 bytes of
the second record of each spectrum in units of 8 sec.
Record 1
Bytes 0-1 c in #1
Bytes 2-3 c in #2
.
.
Bytes 254-255 c in #128
Record 2
Bytes 0-1 c in #129
.
.
.
Bytes 254-255 Accumulation time in units of 8 sec.
Record 1, 2: Background (gain 2) for period prior day 300/84
3, 4: Background (gain 1) for period prior
5, 6: Background (gain 2) calculated around day 10/85
7, 8: Background (gain 2) calculated around day 160/85
9,10: Background (gain 1) calculated around day 180/85
11,12: Background (gain 2) calculated around day 1/86
The background spectra in record 1,2 and 3,4 are identical to the spectra in data
type B1, B2. All 6 spectra have been smoothed (average over 3 bins).
The new effective areas as given on p.34 have been incorporated into the CCF (for
the layout of data type EA, see Express No. 12
p.74). Also the parameters E*j,
P1j, P2J, S1j, S2j in record 4 of data type EA for the transformation to burst length
windows 89-107 and 89-104 have been improved and updated in the CCF.
M. Gottwald
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