The SWIFT BAT Software Guide Version 6.3 30 ... - HEASARC - Nasa

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A.6. MAPS 75 A.6.2 Detector Quality Map A detector quality map file (code “dqcb”) is a ground-derived product. The primary extension contains a quality map indicating which detectors should be used for science analysis and which should not (0=use; 1=discard). This file is typically the output of the bathotpix task, which combines the detector enable/disable map (see “Enable/Disable Map” above) and counts map which has been screened for noisy detectors. Layout. Detector quality file Extension Description Primary 286×173 Map; Detector quality map (0=good; 1=bad) BADPIX List of bad pixels Layout. List of bad pixels. EXTNAME = ‘BADPIX’ Name Format [Units](Range) Comment TIME 1D [s] Start time of hot pixel counts map EXPOSURE 1D [s] Exposure of hot pixel counts map DET ID 1J (0:32767) Detector identification number DETX 1I [pixel](0:285) BAT X detector pixel number DETY 1I [pixel](0:172) BAT Y detector pixel number QUALITY 1I Detector quality flag COUNTS 1J [count] Number of counts in flagged detector The QUALITY flag can take the following values. QUALITY Meaning 0 Good 1 disabled detector 2 cold or undersensitive detector 3 hot or noisy detector A.6.3 Gain / Offset Map Gain/offset maps (code “gocb”) are produced by the BAT on-board automatic calibration system, and provide the linear transformation from pulse height to keV. This map is used with other calibration files to produced calibrated energy values for event and survey data. While other nonlinear corrections should be applied, the basic calculation for a given detector is, PI [keV] = PHA [chan] * GAIN + OFFSET. Gain/offset maps are not always produced during every observation, but the Swift Data Center should collect the nearest map for each snapshot, and should include these maps in the “decb” file. Layout. BAT gain/offset map. EXTNAME = ‘Gain Offset Map’
76 APPENDIX A. BAT DATA FORMATS Name Format [Units] Comment TIME 1D [s] TIME associated with Gain Offsets EXPOSURE 1D [s] Net TIME associated with Gain Offsets GAIN (286,173)E [keV/chan] Detector Gain Values OFFSET (286,173)E [chan] Detector Offset Values DATA FLAGS 1I Data Quality 0=OK, 1=Problem LDPNAME 240A15 BAT File Name BLOCK MAP 1I Block Bit Mask NUM DETS 1J Number of detectors APID 1I Application process Identifier LDP 1J LDP Product Number A.6.4 Mask Weight Map Mask weight maps are produced every time the spacecraft slews to a new pointing position. These are used in combination with the raw mask tagged light curves to produce a processed mask tagged light curve (see “Mask Tagged Rates” above). The weight map is a detector plane map which contains the mask weights for a given catalog source, as derived by ray tracing. The on-board weight maps are offset and scaled such that the mean value is 7 and the range is 0-14. Layout. Mask weight map (attached to each raw mask tagged light curve). EXTNAME = ‘MASK TAG WEIGHT’ Name Format [Units] Comment TIME 1D [s] TIME associated with Mask Weights EXPOSURE 1D [s] Exposure of the Weight MASK WEIGHT (286,173)E Mask tagged weights for source MAKSTAG 1I Mask Tagging enabled? (1=YES; 0=NO) THETA 1E [deg] Source co-latitude in BAT field of view PHI 1E [deg] Source longitude in BAT field of view INVDIST 1E m**{-1} Inverse distance in 1/meters BITSHIFT 1J Number of bits to shift BITMASK 1J Source Bit Mask SUM 4J Sum by quadrant SUMSQ 4J Sum squared by quadrant SUMSQMK 4J Sum squared masked by quadrant MASK 4J Masked quadrant SHIELD 4J Shielded quadrant DATA FLAGS 1I Data Quality 0=OK, 1=Problem LDPNAME 240A15 BAT File Name BLOCK MAP 1I Block Bit Mask NUM DETS 1J Number of detectors APID 1I Application Process Identifier LDP 1J LDP Product Number A.7 TDRSS Messages In addition to the burst light curves (previous section), there are four TDRSS messages produced by the BAT. These are the burst alert (code “msbal”), burst position (ACK) (code “msbce”), no-position (NACK) (code “msbno”) and scaled maps (code “msbsm”). All rate triggers generated
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The SWIFT BAT Software Guide Versio
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ii CONTENTS 4.4 How Sky Fluxes are
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iv CONTENTS 6 BAT Analysis Issues 5
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vi CONTENTS D.1.6 SEE ALSO . . . .
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viii CONTENTS D.10.2 USAGE . . . .
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x CONTENTS D.18.5 EXAMPLES . . . .
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xii CONTENTS
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2 CHAPTER 1. INTRODUCTION • Appen
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4 CHAPTER 2. BAT INSTRUMENT Figure
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8 CHAPTER 2. BAT INSTRUMENT The The
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12 CHAPTER 3. BAT OPERATING MODES A
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20 CHAPTER 4. INTRODUCTION TO BAT A
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