GRB120819A

Analysis Summary

Notes:

1) No attempt has been made to eliminate the non-significant decimal places.
2) This batgrbproduct analysis is done using the HEASARC data.
3) This batgrbproduct analysis is using the flight position for the mask-weighting calculation.

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Thu Jun 11 22:39:55 EDT 2015
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger531428
======================================================================

  Trigger: 00531428      Segment: 000

  BAT Trigger Time: 367074624   [s; MET]
      Trigger Stop: 367074696   [s; MET]
               UTC: 2012-08-19T13:10:14.445520    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 235.887635135529   Dec: -7.30488686709695  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.61
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    7.61

  Analysis Position:   [ source = BAT ]
    RA: 235.887635135529   Dec: -7.30488686709695  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 235.879923719611   Dec: -7.29881705637643  [deg; J2000]  
        { 15h 43m 31.2s , -07d 17' 55.7" }
         +/- 2.23634410683237 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.28343333246984 [arcmin] (formal 1-sigma fit error)
    SNR: 9.63335313855334
 
  Angular difference between the analysis and refined position is 0.585878 arcmin
 
  Partial Coding Fraction: 0.3085938    [ including projection effects ]

  Duration
     T90: 71.0199999809265 +/- 17.3326166382544
        Measured from: 5.66399997472763
                   to: 76.6839999556541     [s; relative to TRIGTIME]
     T50: 27.755999982357 +/- 15.0192393376962
        Measured from: 14.8799999952316
                   to: 42.6359999775887     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 6.19599997997284     
                   to: 7.19599997997284     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 4.4200000166893     
                   to: 83.0120000243187     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.428290   0.795839   0.595127   0.226233
           0.107100   0.096783   0.082591   0.074119 [error]
 Peak      0.020453   0.021202   0.041349   0.022462
           0.012478   0.011545   0.010346   0.009223 [error]

     [ fluence units of on-axis counts / fully illuminated detector ] 

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   78.592    4.420   83.012
T90    71.020    5.664   76.684
T50    27.756   14.880   42.636
Peak    1.000    6.196    7.196
 
 
====== Spectral Analysis Summary =====================================
 
Model      : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index   : photon index: E^{Ph_index}
Ph_90err   : 90% error of the photon index
Epeak      : Epeak in keV
Epeak_90err: 90% error of Epeak
Norm       : normalization at 50 keV in both the PL model and CPL model
Nomr_90err : 90% error of the normalization
chi2       : Chi-Squared
dof        : degree of freedo
 
=== Time-averaged spectral analysis ===
(Best model with acceptable fit: PL)
 
Model Ph_index Ph_90err_low Ph_90err_hi  Epeak  Epeak_90err_low  Epeak_90err_hi  Norm       Nomr_90err_low    Norm_90err_hi    chi2    dof
PL      -1.478    -0.228      0.230       -           -               -         1.88e-03     -2.49e-04          2.48e-04      48.720   57
CPL     -0.511    -1.039      1.473       76.110     -21.348       -76.110      5.76e-03     -5.76e-03          2.55e-02      46.370   56
 
 
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: PL)
 
Model Ph_index Ph_90err_low Ph_90err_hi  Epeak  Epeak_90err_low  Epeak_90err_hi  Norm       Nomr_90err_low    Norm_90err_hi    chi2    dof
PL      -0.785     -0.622     0.752       -           -               -         6.63e-03     -2.70e-03          2.47e-03      61.230   57
CPL     -0.421      0.421     7.059      303.112    -303.112      -303.112      8.87e-03     -4.75e-03          6.48e-01      61.180   56
 
 
=== Fluence/Peak Flux Summary ===
 
              Model    Band1     Band2     Band3     Band4     Band5     Total
                       15-25     25-50    50-100    100-350    15-150    15-350    keV
Fluence         PL   1.84e-07  3.43e-07  4.93e-07  1.50e-06  1.40e-06  2.52e-06   erg/cm2
      90%_error_low -4.21e-08 -4.98e-08 -8.12e-08 -4.70e-07 -1.99e-07 -5.40e-07   erg/cm2
      90%_error_hi   4.51e-08  4.92e-08  8.06e-08  6.03e-07  2.00e-07  6.44e-07   erg/cm2
Peak flux       PL   1.38e-01  2.14e-01  2.48e-01  5.53e-01  7.63e-01  1.15e+00   ph/cm2/s
      90%_error_low -9.54e-02 -1.11e-01 -7.95e-02 -3.15e-01 -2.74e-01 -3.84e-01   ph/cm2/s
      90%_error_hi   1.45e-01  1.14e-01  7.95e-02  5.55e-01  2.87e-01  4.52e-01   ph/cm2/s
 
Fluence        CPL   1.56e-07  3.75e-07  5.14e-07  4.39e-07  1.30e-06  1.48e-06   erg/cm2
      90%_error_low -5.20e-08 -6.18e-08 -9.30e-08 -3.15e-07 -2.34e-07 -3.92e-07   erg/cm2
      90%_error_hi   5.45e-08  6.57e-08  9.28e-08  1.21e-06  2.35e-07  1.24e-06   erg/cm2
Peak flux      CPL   1.18e-01  2.09e-01  2.58e-01  4.28e-01  7.44e-01  1.04e+00   ph/cm2/s
      90%_error_low -1.18e-01 -2.09e-01 -8.91e-02 -4.28e-01 -3.11e-01 -5.87e-01   ph/cm2/s
      90%_error_hi   1.61e-01  1.19e-01  1.20e-01  6.49e-01  3.01e-01  3.10e-01   ph/cm2/s
 
======================================================================

Special notes of this burst

Image

Pre-slew 15.0-350.0 keV image (Event data)

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  235.8799    -7.2988   0.0200    36.0466   -63.6585         2.0262079      9.633 TRIG_00531428                 
 
Foreground time interval of the image:
  4.420  82.701 (delta_t =  78.281 [sec])
Background time interval of the image:
-239.000   4.420 (delta_t = 243.420 [sec])

Light Curves

Note: The mask-weighted lightcurves have units of either count/det or counts/sec/det, where a det is 0.4 x 0.4 = 0.16 sq cm.

Full-time range; 1 s binning

Bokeh Plot

Other quick-look light curves:

64 ms binning (zoomed)
16 ms binning (zoomed)
8 ms binning (zoomed)
2 ms binning (zoomed)
SN=5 or 10 s binning (full-time range)
Raw light curve

Spectra

Notes:

1) The fitting includes the systematic errors.
2) When the burst includes telescope slew time periods, the fitting uses an average response file made from multiple 5-s response files through out the slew time plus single time preiod for the non-slew times, and weighted by the total counts in the corresponding time period using addrmf. An average response file is needed becuase a spectral fit using the pre-slew DRM will introduce some errors in both a spectral shape and a normalization if the PHA file contains a lot of the slew/post-slew time interval.
3) For fits to more complicated models (e.g. a power-law over a cutoff power-law), the BAT team has decided to require a chi-square improvement of more than 6 for each extra dof.

Time averaged spectrum fit using the average DRM

Power-law model

Time interval is from    4.420 sec. to   83.012 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.47808     ( -0.227962   0.229509 )
Norm@50keV  : 1.87516E-03    ( -0.000248916   0.000248097 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          48.72 using 59 PHA bins.
# Reduced chi-squared =         0.8548 for     57 degrees of freedom 
# Null hypothesis probability =   7.742381e-01
 
Photon flux (15-150 keV)    in 78.59 sec: 0.232746 ( -0.032163  0.032351 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.40336e-06 ( -1.98607e-07  2.00431e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from    4.420 sec. to   83.012 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.510698     ( -1.03926   1.47289 )
Epeak [keV] : 76.1100      ( -21.3352 -76.0972 )
Norm@50keV  : 5.76092E-03    ( -0.00576374   0.0255084 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          46.37 using 59 PHA bins.
# Reduced chi-squared =         0.8281 for     56 degrees of freedom 
# Null hypothesis probability =   8.169389e-01
 
Photon flux (15-150 keV)    in 78.59 sec: 0.221587 ( -0.034869  0.034737 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.29585e-06 ( -2.3397e-07  2.35012e-07 ) ergs/cm2

1-s peak spectrum fit

Power-law model

Time interval is from    6.196 sec. to    7.196 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.785376     ( -0.621917   0.75154 )
Norm@50keV  : 6.63171E-03    ( -0.00270321   0.0024707 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.23 using 59 PHA bins.
# Reduced chi-squared =          1.074 for     57 degrees of freedom 
# Null hypothesis probability =   3.268856e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.762617 ( -0.274311  0.287453 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.79848e-08 ( -2.54012e-08  2.54818e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    6.196 sec. to    7.196 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.42098     ( 0.419057   7.05757 )
Epeak [keV] : 303.112      ( -301.78 -301.78 )
Norm@50keV  : 8.86597E-03    ( -0.00476452   0.647968 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.18 using 59 PHA bins.
# Reduced chi-squared =          1.092 for     56 degrees of freedom 
# Null hypothesis probability =   2.954967e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.744212 ( -0.310609  0.300918 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.74373e-08 ( -2.63774e-08  2.57937e-08 ) ergs/cm2

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 71.02 sec.
Hardness ratio (energy fluence ratio) = 1.43591912515

S(15-50 keV) vs. S(50-150 keV) plot

S(15-50 keV)  = 5.276582e-07
S(50-150 keV) = 8.757094e-07

The dash-dotted line and the dashed line traces the fluences calculated from the Band function with Epeak = 15 and 150 keV, respectively. Both lines assume a canonical values of alpha = -1 and beta = -2.5.

Mask shadow pattern

 IMX = 3.229335019026143E-01,

Spacecraft aspect plot

Bright

Pre-burst

 Time interval of the image: -239.000000 4.420000

# RAcent #  [deg] 244.9919 -15.6350 254.3758  35.2345 255.9831 -37.8446 256.2726 -36.2811 263.0478 -24.7931 264.9683 -44.5840 268.3804  -1.5138 270.2865 -25.0413 270.2052 -25.7159 273.9080 -14.0526 275.8761 -30.2496 284.9699 -25.0891 288.8131  10.9489 263.1889 -33.9669

Pre-slew

 Time interval of the image: 4.420000 82.700600

# RAcent #  [deg] 245.1329 -15.5553 254.4616  35.4128 256.0193 -37.9116 256.4486 -36.4203 263.1650 -24.6753 264.9683 -44.5840 268.2442  -1.5683 270.4105 -25.0334 270.4953 -25.8644 273.9409 -14.2010 276.1006 -30.3707 285.1839 -24.8468 288.8812  10.8548 262.7931 -33.7233 259.9685 -30.3088 235.8799  -7.2988 237.1587  23.6038

Post-slew

 Time interval of the image: 140.300620 317.700640

# RAcent #  [deg] 244.9802 -15.6356 254.4362  35.3569 255.9744 -37.8582 256.6068 -36.3633 262.9938 -24.6152 264.6891 -44.5252 268.4622  -1.3461 270.2484 -24.9569 270.4801 -25.6320 274.0056 -14.0362 263.1493 -33.8896 272.0099 -27.5569 243.4426  50.5060 190.4369 -50.5870 195.8653   1.1322

IMY = 6.522179006549594E-01 source in the pre-burst/pre-slew/post-slew images

image of 15-350 keV band DECcent POSerr Theta Phi PeakCts SNR AngSep Name [deg] ['] [deg] [deg] ['] 0.4 24.8 -73.2 9.8777 32.5 0.8 Sco X-1 5.8 57.6 -5.5 2.6508 2.0 7.6 Her X-1 0.3 21.7 -137.0 10.0332 41.0 0.2 4U 1700-377 36.4 20.4 -134.7 0.0747 0.3 11.6 GX 349+2 11.7 8.3 -114.0 0.2276 1.0 3.6 GX 1+4 0.0 24.8 -160.1 0.1218 0.5 12.6 4U 1735-44 4.1 18.9 3.3 0.6556 2.8 3.7 SW J1753.5-0127 2.4 4.8 -166.0 1.0366 4.7 2.3 GX 5-1 7.9 5.5 -165.7 0.3212 1.5 5.5 GRS 1758-258 3.7 7.0 37.5 0.7172 3.2 5.8 GX 17+2 6.7 11.0 165.9 0.3857 1.7 7.5 H1820-303 7.9 14.1 122.9 0.3344 1.5 10.7 HT1900.1-2455 1.3 36.0 41.7 3.9474 8.7 0.9 GRS 1915+105 0.0 15.2 -145.6 0.2957 1.4 12.7 GX 354-0 background subtracted image of 15-350 keV band DECcent POSerr Theta Phi PeakCts SNR AngSep Name [deg] ['] [deg] [deg] ['] 5.9 24.7 -72.9 -0.2755 -2.0 10.2 Sco X-1 3.6 57.8 -5.3 1.9908 3.2 4.2 Her X-1 2.5 21.7 -137.2 0.5192 4.6 4.3 4U 1700-377 4.6 20.4 -135.2 0.2827 2.5 0.7 GX 349+2 4.4 8.2 -113.7 0.2855 2.6 9.5 GX 1+4 0.0 24.8 -160.1 -0.2232 -1.9 12.6 4U 1735-44 43.8 18.8 2.8 -0.0285 -0.3 10.2 SW J1753.5-0127 11.8 4.8 -167.4 -0.1089 -1.0 7.4 GX 5-1 0.0 5.6 -168.5 0.0489 0.4 12.7 GRS 1758-258 5.3 6.8 38.3 -0.2215 -2.2 10.6 GX 17+2 5.5 11.2 165.3 -0.2180 -2.1 9.1 H1820-303 4.6 14.2 121.8 0.2760 2.5 9.2 HT1900.1-2455 3.6 35.9 41.9 0.6059 3.3 7.3 GRS 1915+105 7.3 15.1 -144.0 -0.1711 -1.6 11.8 GX 354-0 2.6 13.9 -128.1 0.4902 4.5 ------ UNKNOWN 1.2 36.0 -63.7 2.0269 9.6 ------ UNKNOWN 3.0 54.7 -28.0 1.7362 3.9 ------ UNKNOWN image of 15-350 keV band DECcent POSerr Theta Phi PeakCts SNR AngSep Name [deg] ['] [deg] [deg] ['] 0.3 12.2 121.3 7.0229 41.3 0.3 Sco X-1 2.2 46.1 8.4 1.8784 5.2 1.4 Her X-1 0.6 35.5 139.6 6.2465 19.4 1.0 4U 1700-377 4.4 34.7 137.3 0.8321 2.6 9.0 GX 349+2 7.3 31.1 114.2 0.4785 1.6 7.9 GX 1+4 5.5 44.8 138.2 1.3530 2.1 5.1 4U 1735-44 4.7 33.0 68.5 0.8074 2.4 8.5 SW J1753.5-0127 6.2 37.2 109.7 0.8310 1.9 7.6 GX 5-1 11.4 37.7 110.5 -0.4780 -1.0 11.7 GRS 1758-258 609.1 38.0 90.8 -0.0117 -0.0 0.0 GX 17+2 19.2 36.6 127.8 -0.2388 -0.6 8.6 GX 354-0 2.7 39.7 112.5 2.6250 4.3 ------ UNKNOWN 2.3 58.2 -7.0 4.6057 5.0 ------ UNKNOWN 3.9 57.3 -160.1 2.9897 3.0 ------ UNKNOWN 3.1 40.8 -92.4 3.3326 3.7 ------ UNKNOWN

Analysis Summary

Notes:

Image

Pre-slew 15.0-350.0 keV image (Event data)

Light Curves

Full-time range; 1 s binning

Other quick-look light curves:

64 ms binning (zoomed) 16 ms binning (zoomed) 8 ms binning (zoomed) 2 ms binning (zoomed) SN=5 or 10 s binning (full-time range) Raw light curve

Spectra

Notes:

Time averaged spectrum fit using the average DRM

Power-law model

Cutoff power-law model

1-s peak spectrum fit

Power-law model

Cutoff power-law model

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

S(15-50 keV) vs. S(50-150 keV) plot

Mask shadow pattern

Spacecraft aspect plot

Bright

64 ms binning (zoomed)
16 ms binning (zoomed)
8 ms binning (zoomed)
2 ms binning (zoomed)
SN=5 or 10 s binning (full-time range)
Raw light curve