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ENERGY-CHANNEL Conversion Table
(for FTOOLS 5.0, pca_e2c_e04v01.fits, and Epoch 4)
This table contains information about the channel-energy relationship
for RXTE PCA data for the three gain epochs of the mission so far
(Epoch 1 = launch through 3/21/96; Epoch 2 = 3/21/96 - 4/15/96; Epoch
3 = 4/15/96 - 3/22/99; Epoch 4 = 3/22/99 - present). In each case the data were generated for the
full PCA with all detectors and layers added, using FTOOLS 5.0 and the
energy-to-channel file pca_e2c_e04v01.fits. If you have used earlier
versions of the response matrix generation tools, you will notice
small differences between your values and the values given here.
(The energy-channel conversion
for FTOOLS 4.1 is available for comparison. The
energy-channel conversion for
FTOOLS 3.7 is available for comparison.)
The PCA onboard electronics bin up the channels differently depending on which configuration has been requested. The first column contains the ORIGINAL (or absolute) channels, while the second column contains the channel binning for Standard 2 data (which is the type of data most RXTE analysts start on). Subsequent columns give the maximum energy bound for each channel.
IMPORTANT NOTES:
- Remember that when you perform channel selection, the extractors require you to supply the ORIGINAL channel boundaries, regardless of the mode of data you are analyzing (Std2, Binned, Event, GoodXenon etc). For further details see the ABC guide, or the cookbook recipe "Creating and plotting light curves, hardness ratios and color-color diagrams."
- The information in this table is useful for most cases, but
should be considered only approximate (within a few percent). If you
are performing analysis for which the exact values of the energy
boundaries are critical, or if you are analyzing data from separate
layers and detectors, you should generate a response matrix for your
particular dataset and examine the channel-energy information
contained in the first extension of the FITS file.
- Note that the response matrix generator in FTOOLS 4.1 and higher now
accounts for the slow gain drift in the PCA. This gain shift amounts
to ~ 1 % over two years. The Epoch 3 and 4 values given in the table below
are computed for the beginning of each epoch.
EPOCH: 1 2 3 4
START DATE: - 3/21/96 4/15/96 3/22/99
STOP DATE: 3/21/96 4/15/96 3/22/99 -
(stop time:) (18:33) (23:05) (17:37)
CHANNEL E_MAX E_MAX E_MAX E_MAX
(Abs) (Std2) keV keV keV keV
0-4 0 1.28 1.55 1.94 2.03
5 1 1.55 1.86 2.29 2.45
6 2 1.81 2.17 2.65 2.88
7 3 2.07 2.48 3.01 3.30
8 4 2.34 2.79 3.36 3.72
9 5 2.60 3.10 3.72 4.14
10 6 2.86 3.40 4.07 4.57
11 7 3.13 3.71 4.43 4.99
12 8 3.39 4.02 4.79 5.41
13 9 3.66 4.33 5.14 5.84
14 10 3.92 4.64 5.50 6.26
15 11 4.19 4.95 5.86 6.69
16 12 4.45 5.26 6.22 7.11
17 13 4.71 5.57 6.58 7.54
18 14 4.98 5.88 6.94 7.97
19 15 5.24 6.19 7.30 8.39
20 16 5.51 6.50 7.65 8.82
21 17 5.78 6.81 8.01 9.25
22 18 6.04 7.12 8.38 9.67
23 19 6.31 7.44 8.74 10.10
24 20 6.57 7.75 9.10 10.53
25 21 6.84 8.06 9.46 10.96
26 22 7.10 8.37 9.82 11.39
27 23 7.37 8.68 10.18 11.82
28 24 7.64 9.00 10.54 12.25
29 25 7.90 9.31 10.91 12.68
30 26 8.17 9.62 11.27 13.1
31 27 8.44 9.93 11.63 13.54
32 28 8.71 10.25 12.00 13.97
33 29 8.97 10.56 12.36 14.40
34 30 9.24 10.87 12.72 14.84
35 31 9.51 11.19 13.09 15.27
36 32 9.78 11.50 13.45 15.70
37 33 10.04 11.81 13.82 16.14
38 34 10.31 12.13 14.18 16.57
39 35 10.58 12.44 14.55 17.01
40 36 10.85 12.76 14.92 17.44
41 37 11.12 13.07 15.28 17.88
42 38 11.39 13.39 15.65 18.31
43 39 11.66 13.70 16.02 18.75
44 40 11.92 14.02 16.38 19.19
45 41 12.19 14.33 16.75 19.62
46 42 12.46 14.65 17.12 20.06
47 43 12.73 14.97 17.49 20.50
48 44 13.00 15.28 17.86 20.94
49 45 13.27 15.60 18.23 21.37
50 46 13.54 15.92 18.60 21.81
51 47 13.81 16.23 18.97 22.25
52 48 14.08 16.55 19.34 22.69
53 49 14.35 16.87 19.71 23.13
54-5 50 14.90 17.50 20.45 24.02
56-7 51 15.44 18.14 21.19 24.90
58-9 52 15.98 18.77 21.94 25.79
60-1 53 16.53 19.41 22.69 26.67
62-3 54 17.07 20.05 23.44 27.56
64-5 55 17.62 20.69 24.19 28.45
66-7 56 18.16 21.33 24.94 29.35
68-9 57 18.71 21.97 25.69 30.24
70-1 58 19.26 22.61 26.44 31.14
72-3 59 19.80 23.26 27.20 32.03
74-5 60 20.35 23.90 27.96 32.93
76-7 61 20.90 24.55 28.72 33.84
78-9 62 21.45 25.19 29.48 34.74
80-1 63 22.00 25.84 30.24 35.65
82-3 64 22.55 26.48 31.00 36.55
84-5 65 23.11 27.13 31.77 37.46
86-7 66 23.66 27.78 32.53 38.37
88-9 67 24.21 28.43 33.30 39.29
90-1 68 24.77 29.08 34.07 40.20
92-3 69 25.32 29.73 34.84 41.12
94-5 70 25.88 30.39 35.61 42.04
96-7 71 26.43 31.04 36.39 42.96
98-9 72 26.99 31.69 37.16 43.88
100-1 73 27.55 32.35 37.94 44.81
102-3 74 28.11 33.00 38.72 45.73
104-5 75 28.67 33.66 39.50 46.66
106-7 76 29.23 34.32 40.28 47.59
108-9 77 29.79 34.98 41.07 48.52
110-1 78 30.35 35.64 41.85 49.46
112-3 79 30.91 36.30 42.64 50.40
114-5 80 31.48 36.96 43.43 51.33
116-7 81 32.04 37.62 44.22 52.28
118-9 82 32.60 38.29 45.02 53.22
120-1 83 33.17 38.95 45.81 54.16
122-3 84 33.74 39.62 46.61 55.11
124-5 85 34.30 40.28 47.40 56.06
126-7 86 34.87 40.95 48.20 57.01
128-9 87 35.44 41.62 49.01 57.97
130-1 88 36.01 42.29 49.81 58.92
132-3 89 36.58 42.96 50.61 59.88
134-5 90 37.15 43.63 51.42 60.84
136-8 91 38.01 44.64 52.64 62.29
139-41 92 38.87 45.65 53.85 63.74
142-4 93 39.73 46.66 55.08 65.19
145-7 94 40.59 47.68 56.30 66.65
148-50 95 41.46 48.70 57.53 68.12
151-3 96 42.32 49.72 58.77 69.59
154-6 97 43.19 50.74 60.01 71.06
157-9 98 44.06 51.76 61.25 72.54
160-2 99 44.94 52.79 62.50 74.03
163-5 100 45.81 53.82 63.76 75.52
166-8 101 46.69 54.85 65.01 77.02
169-71 102 47.57 55.88 66.28 78.53
172-4 103 48.45 56.92 67.54 80.04
175-7 104 49.33 57.96 68.81 81.55
178-80 105 50.21 59.00 70.09 83.07
181-3 106 51.10 60.04 71.37 84.60
184-6 107 51.99 61.09 72.66 86.13
187-9 108 52.88 62.14 73.95 87.67
190-2 109 53.77 63.19 75.25 89.22
193-5 110 54.66 64.24 76.55 90.77
196-8 111 55.56 65.30 77.85 92.33
199-201 112 56.46 66.36 79.17 93.89
202-4 113 57.36 67.42 80.48 95.46
205-7 114 58.26 68.48 81.81 97.04
208-10 115 59.16 69.55 83.13 98.62
211-3 116 60.07 70.62 84.47 100.21
214-6 117 60.98 71.69 85.81 101.81
217-9 118 61.89 72.76 87.15 103.41
220-2 119 62.80 73.84 88.50 105.02
223-5 120 63.71 74.92 89.86 106.64
226-8 121 64.63 76.00 91.22 108.27
229-31 122 65.55 77.09 92.59 109.90
232-4 123 66.47 78.18 93.96 111.54
235-7 124 67.40 79.27 95.34 113.19
238-41 125 68.63 80.73 97.19 115.39
242-5 126 69.87 82.19 99.05 117.62
246-9 127 71.11 83.66 100.92 119.85
250-5 128 72.98 85.87 103.75 123.23
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