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Contents of /trunk/projects/dm/Cube/examples/chandra_event_mapping.info

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Revision 4509 - (show annotations)
Wed Oct 11 16:12:20 2017 UTC (3 years ago) by mdittmar
File size: 7796 byte(s)
migrating to new structure
1 Chandra L2 Event list (HRC with Gratings)
2 source file: <VODIR>/data/NDCube/hrcf00460_repro_evt2.fits
3 Actions:
4 + stripped of HISTORY, COMMENT and DM subspace keys and GTI table.
5 + reduced size to small number of records and/or bins.
6
7 =======================================================================================================================================
8 File: chandra_events.fits:
9 =======================================================================================================================================
10 ColNo Name Unit Type Range Null
11 1 time s Real8 63791262.4739779979:63832725.7754840031 - time tag of data record
12 2 rd(tg_r,tg_d) deg Real4 -2.0:2.0 - Grating angular coords
13 3 chip(chipx,chipy) pixel Int2 1:4096 - Chip coords
14 4 tdet(tdetx,tdety) pixel Int4 1:4096 - Tdet coords
15 5 det(detx,dety) pixel Real4 0.50:65536.50 - Det coords
16 6 sky(x,y) pixel Real4 0.50:65536.50 - Sky coords
17 7 chip_id Int2 1:3 -
18 8 pha chan Int2 0:255 -
19 9 pi chan Int2 0:1023 4719
20 10 tg_m Int2 -62:62 99 Diffraction order (m)
21 11 tg_lam angstrom Real4 0:400.0 - wavelength (lambda)
22 12 tg_mlam angstrom Real4 -400.0:400.0 0.00200000009499 Order times wavelength (m * lambda)
23 13 tg_srcid Int2 0:32767 - source ID, index from detect table
24 14 tg_part Int2 0:99 - component index (HEG, MEG, LEG, HESF regions)
25 15 tg_smap Int2 0:32767 - source map; flags for up to 10 sources
26 16 status[4] Bit(4) event status bits
27
28 w3: CPC(CPCX) = (+0)[mm] +(+0.0064)* (chip(chipx)-(+0.50))
29 (CPCY) (+0) (+0.0064) ( (chipy) (+0.50))
30
31 w5: MSC(PHI ) = (+0)[deg] +TAN-P[(+3.66111E-05)* (det(detx)-(+32768.50))]
32 (THETA) (+0) (+3.66111E-05) ( (dety) (+32768.50))
33
34 w6: EQPOS(RA ) = (+187.2802)[deg] +TAN[(-3.66111E-05)* (sky(x)-(+32768.50))]
35 (DEC) (+2.0570 ) (+3.66111E-05) ( (y) (+32768.50))
36
37 'w#' = virtual world coordinate from physical basis column '#'
38
39
40 ================================================================================
41 Frames: FITS Key
42 TimeFrame (timeframe)
43 - refFrame = 'TT' TIMESYS
44 - refPosition = StandardRefPosition.location = 'TOPOCENTER'? <none>
45 - refDirection = NULL
46 - time0 = TimeCoord.coord.value = 50814.00 MJDREF
47
48 SpectralFrame (phaframe)
49 - refPosition = StandardRefPosition.location = 'TOPOCENTER'? <none>
50
51 SpaceFrame (chipframe)
52 # Chip gives row and column number on each chip.
53 ## One per Chip; chip_id column == ID of frame.
54 - refFrame = 'CUSTOM' <none>
55 - refPosition = StandardRefPosition.location = 'TOPOCENTER' <none>
56 - epoch = NULL <none>
57 - flavor = 'cartesian' <none>
58 * Domain.x = 1:4096 TLMIN|MAX4
59 * Domain.y = 1:16456 TLMIN|MAX5
60
61 SpaceFrame (tdetframe)
62 # TDet gives all the chips placed next to each other.
63 The offsets between the chips are arbitrary.
64 # tdet = T(chip_id, chip)
65 - refFrame = 'CUSTOM' <none>
66 - refPosition = StandardRefPosition.location = 'TOPOCENTER' <none>
67 - epoch = NULL <none>
68 - flavor = 'cartesian' <none>
69 * Domain.x = 1:4096 TLMIN|MAX6
70 * Domain.y = 1:49368 TLMIN|MAX7
71
72 SpaceFrame (detframe)
73 # A projection of the photon positions onto the tangent plane to the unit sphere,
74 with the tangent point being the Chandra telescope's optical axis. The center
75 of the coordinate system is 4096,4096 for ACIS. NO Aspect solution applied, but
76 it looks like some RANDOMIZING takes place.
77 (boresighting is taken into account in the mapping from CHIP to DET).
78 # det = T(chip_id,chip) + RAND(0.5)
79 - refFrame = 'CUSTOM' <none>
80 - refPosition = StandardRefPosition.location = 'TOPOCENTER'? <none>
81 - epoch = NULL <none>
82 - flavor = 'cartesian' <none>
83 * Domain.x = 0.5:65536.5 TLMIN|MAX8
84 * Domain.y = 0.5:65536.5 TLMIN|MAX9
85
86 SpaceFrame (skyframe)
87 # Pixels in the tangent plane. The X and Y axes are aligned with J2000 RA and Dec
88 in the ICRS (Hipparcos) frame. Folds in aspect solution to map DET coordinates
89 to SKY. Because the RA and Dec of the optical axis are changing, and in principle
90 for a merged observation may change a lot, the tangent point of the projection is
91 an arbitrary position (but it is usually chosen to be the targeted RA and Dec,
92 or close to it).
93 # sky = T(det)
94 - refFrame = 'CUSTOM' <none>
95 - refPosition = StandardRefPosition.location = 'TOPOCENTER'? <none>
96 - epoch = NULL <none>
97 - flavor = 'cartesian' <none>
98 * Domain.x = 0.5:65536.5 TLMIN|MAX10
99 * Domain.y = 0.5:65536.5 TLMIN|MAX11
100
101 SpaceFrame (icrsframe)
102 # eqpos = T(sky)
103 - refFrame = 'ICRS' RADECSYS
104 - refPosition = StandardRefPosition.location = 'TOPOCENTER'? <none>
105 - epoch = NULL EQUINOX
106 - flavor = 'spherical' <none>
107 * Domain.x = 0:360 (deg) <none>
108 * Domain.y = -90:+90 (deg) <none>
109

msdemlei@ari.uni-heidelberg.de
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