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

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A.5. RATE FILES 73 Name Format [Units] Comment TIME 1D [s] TIME of Rates QUAD0CNTS 4I [count] Quadrant 0 counts in highest XX ms time bin in 4 energy bins QUAD1CNTS 4I [count] Quadrant 1 counts in highest XX ms time bin in 4 energy bins QUAD2CNTS 4I [count] Quadrant 2 counts in highest XX ms time bin in 4 energy bins QUAD3CNTS 4I [count] Quadrant 3 counts in highest XX ms time bin in 4 energy bins Q 0 1 CNTS 4I [count] Quadrant 0+1 counts in highest XX ms time bin in 4 energy bins Q 0 2 CNTS 4I [count] Quadrant 0+2 counts in highest XX ms time bin in 4 energy bins Q 1 3 CNTS 4I [count] Quadrant 1+3 counts in highest XX ms time bin in 4 energy bins Q 2 3 CNTS 4I [count] Quadrant 2+3 counts in highest XX ms time bin in 4 energy bins ARRAY CNTS 4I [count] Array counts in highest XX ms time bin in 4 energy bins A.5.5 Mask-tagged Light Curves Mask-tagged light curves (code “mt”) are produced by the BAT flight software, typically for three sources in the BAT field of view. In most cases, one source will be the most recent gamma-ray burst, and the other two sources will be bright variable sources also in the field of view. The flight code weights each event for each source position, and bins the weighted events into light curves with 1.6 second time binning and four channel energy binning. The raw light curves are not background subtracted (the on-board algorithm introduces biases and scale factors that must be accounted for). Ground processing must be performed to convert the raw weighted counts into backgroundsubtracted rates. The batmasktaglc accepts the raw mask tagged rate file, the mask weight map, and the quadrant rate file (which must cover the same time period), and produces a “processed” light curve, which is background subtracted. The raw light curve has an extension with the time and weighted counts columns (in four channels). Mask weight maps are attached in a separate extension (see “Mask Weight Maps” below). The processed light curve has estimated rate, error and background columns. An EBOUNDS and GTI extension are also appended. Code Meaning sw*bmtNNNNNNNN rw.lc Raw weighted counts for catalog source NNNNNNNN sw*bmtNNNNNNNN.lc Processed mask weighted counts for catalog source NNNNNNNN Layout. Processed mask weighted counts. EXTNAME = ‘RATE’ Name Format [Units] Comment TIME 1D [s] TIME of Rates RATE 4E [count/s] Processed mask weighted rate per 1600 ms time bin in 4 energy bins ERROR 4E [count/s] Estimated statistical uncertainty in RATE column in 4 energy bins BACKV 4E [count/s] Estimated background level in 4 energy bins Layout. Raw mask weighted counts. EXTNAME = ‘MASK TAG RATES’ Name Format [Units] Comment TIME 1D [s] TIME of Rates WEIGHTED COUNTS 1J [count] Raw mask weighted counts per 1600 ms time bin in 4 energy bins
74 APPENDIX A. BAT DATA FORMATS A.5.6 TDRSS GRB Light Curves Burst light curves (code “msb” or “bhp”) are sent down in two channels, through TDRSS and in the high priority solid-state recorder ground pass channel. These files cover a time from 24 seconds before to 185 seconds after the burst. They have four energy channels. The time binning varies and is densest (0.128 seconds) closest to the trigger time and least dense (4.096 seconds) well after the trigger. Since these light curves come through the TDRSS channel they can be used to quickly determine high level burst properties. The TDRSS light curves also have attitude data attached on the same time scale as the light curves. The attitude data is processed into separate files. Layout. Initial BAT TDRSS light curve EXTNAME = ‘TDRSS LC’ Name Format [Units] Comment TIME 1D [s] TIME of rates RELTIME 1D [s] Bin time relative to trigger time TIMEDEL 1D [s] Width of time bin RAW COUNTS 4J [count] Counts per time bin in 4 energy bins RATE 4E [count/s] Rate in 4 energy bins ERROR 4E [count/s] Statistical uncertainty in RATE TOT COUNTS 1J [count] Total array counts in all energy bins TOT RATE 1E [count/s] Total array rate in all energy bins TOT RATE ERR 1E [count/s] Statistical uncertainty in TOT RATE A.6 Maps A.6.1 Detector Enable/Disable Map Detector enable/disable maps (code “decb”). The BAT on-board software automatically maintains a map of enabled and disabled detectors. Detectors may be automatically disabled if they are noisy. Detectors may also be enabled or disabled based on ground command. When the enable/disable state changes, a new map is set to the ground. NOTE: per OGIP convention, a 0 value indicates an enabled detector, while a non-zero value indicates a disabled detector. Detector enable/disable 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. Detector Enable/Disable Map EXTNAME = ‘Det Enable Map’ Name Format [Units] Comment TIME 1D [s] TIME associated with Detector Enable FLAG (286,173)B Detector logical flag 0=enabled, 1=disabled 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
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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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