batgrbproduct analysis for trigger=331856

batgrbproduct Analysis for Trigger=331856

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 (local time): Sun Jan 19 21:41:27 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger331856
======================================================================

  Trigger: 00331856      Segment: 000

  BAT Trigger Time: 245879237.696   [s; MET]
      Trigger Stop: 245879239.744   [s; MET]
               UTC: 2008-10-16T19:47:14.515960    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 14.6151239564649   Dec: -43.5430521619781  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.48
     Image Trigger?:     NO
     Rate S/N Ratio:     19.6977156035922  [ if not an image trigger ]
     Image S/N Ratio:    7.48

  Flight Position:   [ source = BAT ]
    RA: 14.6151239564649   Dec: -43.5430521619781  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 14.5889026488615   Dec: -43.5373558434781  [deg; J2000]  
        { 00h 58m 21.3s , -43d 32' 14.5" }
         +/- 2.25186570369933 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.911745631391313 [arcmin] (formal 1-sigma fit error)
    SNR: 9.53863556340353
 
  Angular difference between Flight and Ground position is 1.190568 arcmin
 
  Partial Coding Fraction: 0.984375    [ including projection effects ]

  Duration
     T90: 2.61599999666214 +/- 0.792706748977127
        Measured from: 0.23199999332428
                   to: 2.84799998998642     [s; relative to TRIGTIME]
     T50: 1.17200002074242 +/- 0.311589493590561
        Measured from: 0.787999987602234
                   to: 1.96000000834465     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.503999978303909     
                   to: 1.50399997830391     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.0200000107288361     
                   to: 2.95600000023842     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.022154   0.044121   0.049977   0.030735
           0.007569   0.008158   0.007336   0.006451 [error]
 Peak      0.011400   0.016071   0.029818   0.016023
           0.004412   0.004821   0.004412   0.003918 [error]

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

======================================================================
 
=== 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   Power-law 6.08e-09 1.73e-08 4.01e-08 2.51e-07 1.08e-07 3.15e-07   erg/cm2
              Error 2.39e-09 3.99e-09 6.77e-09 1.09e-07 1.86e-08 1.11e-07   erg/cm2
Peak flux Power-law 7.41e-02 1.34e-01 1.86e-01 5.37e-01 5.34e-01 9.31e-01   ph/cm2/s
              Error 4.01e-02 4.33e-02 3.36e-02 2.48e-01 1.06e-01 2.29e-01   ph/cm2/s
 
Fluence   Cutoff-PL 6.15e-09 1.74e-08 4.01e-08 2.47e-07 1.08e-07 3.10e-07   erg/cm2
              Error 2.37e-09 4.00e-09 7.24e-09 2.16e-07 1.85e-08 1.15e-07   erg/cm2
Peak flux Cutoff-PL 7.64e-02 1.36e-01 1.86e-01 5.22e-01 5.36e-01 9.20e-01   ph/cm2/s
              Error 4.32e-02 4.35e-02 3.45e-02 3.07e-01 1.06e-01 3.00e-01   ph/cm2/s
 
Fluence        Band -------- -------- -------- -------- -------- --------   erg/cm2
              Error -------- -------- -------- -------- -------- --------   erg/cm2
Peak flux      Band -------- -------- -------- -------- -------- --------   ph/cm2/s
              Error -------- -------- -------- -------- -------- --------   ph/cm2/s

 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    0.789    0.319    -      -           3.10e-03 5.46e-04   44.500 57
CPL   0.782    0.727    10000.0    0.0      3.12e-03 -1.28e-03   44.510 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    0.527    0.407    -      -           4.53e-03 1.05e-03   41.940 57
CPL   0.539    0.533    9999.4    0.0      4.59e-03 -1.74e-03   41.960 56
 
Model      : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index   : photon index: E^-{Ph_index} (minus sign is not included in the 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 PL model and at 1 keV in CPL model
Nomr_90err : 90% error of the normalization
chi2       : Chi-Squared
dof        : degree of freedom

 
=== T90/T50 calculation in the 50-300 keV band (BATSE band) using 64 ms lc ===
 
T90 in the 50-300 keV band: 1.920000 sec.
T50 in the 50-300 keV band: 0.896000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100    2.976   -0.020    2.956
T90     2.616    0.232    2.848
T50     1.172    0.788    1.960
Peak    1.000    0.504    1.504

Click here for the BAT GCN circular template

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
   14.5889   -43.5374   0.0203    17.2807    13.0352         0.1537437      9.539 TRIG_00331856                 
 
Foreground time interval of the image:
 -0.020   2.956 (delta_t =   2.976 [sec])
Background time interval of the image:
-239.696  -0.020 (delta_t = 239.676 [sec])

Lightcurves

Notes:

1) The mask-weighted light curves are using the flight position.
2) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
3) For all the mask-weighted lightcurves, the y-axis units are counts/sec/det where a det is 0.4 x 0.4 = 0.16 sq cm.
4) The verticle lines correspond to following: green dotted lines are T50 interval, black dotted lines are T90 interval, blue solid line(s) is a spacecraft slew start time, and orange solid line(s) is a spacecraft slew end time.
5) Time of each bin is in the middle of the bin.

1 s binning

From T0-310 s to T0+310 s

From T100_start - 20 s to T100_end + 30 s

Full time interval

64 ms binning

Full time interval

From T100_start to T100_end

From T0-5 sec to T0+5 sec

16 ms binning

From T100_start-5 s to T100_start+5 s

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000

8 ms binning

From T100_start-3 s to T100_start+3 s

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000

2 ms binning

From T100_start-1 s to T100_start+1 s

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000

SN=5 or 10 sec. binning (whichever binning is satisfied first)

SN=5 or 10 sec. binning (T < 200 sec)

Quad-rate summed light curves (from T0-300s to T0+1000s)

Spectral Evolution

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   -0.020 sec. to    2.956 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.788878     ( -0.333927   0.304357 )
Norm@50keV  : 3.10088E-03    ( -0.000555197   0.000537287 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          44.50 using 59 PHA bins.
# Reduced chi-squared =         0.7808 for     57 degrees of freedom 
# Null hypothesis probability =   8.858992e-01
 
Photon flux (15-150 keV)    in 2.976 sec: 0.356540 ( -0.0606195  0.0610069 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.08348e-07 ( -1.85291e-08  1.86426e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.020 sec. to    2.956 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.781616     ( -1.06908   0.385311 )
Epeak [keV] : 1.00000E+04      (   )
Norm@50keV  : 3.12305E-03    ( -0.000556876   -0.0031232 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          44.51 using 59 PHA bins.
# Reduced chi-squared =         0.7949 for     56 degrees of freedom 
# Null hypothesis probability =   8.655589e-01
 
Photon flux (15-150 keV)    in 2.976 sec: 0.357391 ( -0.061607  0.059528 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.08165e-07 ( -1.83167e-08  1.87181e-08 ) ergs/cm2

Band function

Time interval is from   -0.020 sec. to    2.956 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.877018   ( 0.877079   0.877079 )
beta        : -0.788874    ( -0.304085   0.333926 )
Epeak [keV] : 13.0334      ( -13.0327 -13.0327 )
Norm@50keV   : 4.73468E-03    ( -0.00215851   0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          44.50 using 59 PHA bins.
# Reduced chi-squared =         0.8092 for     55 degrees of freedom 
# Null hypothesis probability =   8.432260e-01
 
Photon flux (15-150 keV)    in 2.976 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

Single BB

 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    : 26.3020  (-5.82287  9.37265)
R^2/D10^2   : 7.62780E-03  (-0.00443518   0.00870962)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.92 using 59 PHA bins.
# Reduced chi-squared =         0.8934 for     57 degrees of freedom 
# Null hypothesis probability =   7.011823e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.654e-09   1.003e-09
25- 50  1.544e-08   5.259e-09
50-150  7.849e-08   2.425e-08
15-150  9.659e-08   2.768e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (      )
Norm        : 1.44387       (-0.253272     0.253244)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.90 using 59 PHA bins.
# Reduced chi-squared =          1.086 for     57 degrees of freedom 
# Null hypothesis probability =   3.054359e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.071e-08   6.175e-09
25- 50  2.060e-08   1.180e-08
50-150  4.517e-08   2.530e-08
15-150  7.647e-08   4.361e-08

Double BB

R1^2/D10^2  : 3.39544E-02        (      )
kT2 [keV]   : 198.058        (      )
R2^2/D10^2  : 7.85025E-05    (-4.05916e-05   0.00352374)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          44.33 using 59 PHA bins.
#Fit statistic : Chi-Squared =          44.13 using 59 PHA bins.
#Fit statistic : Chi-Squared =          44.01 using 59 PHA bins.
# Reduced chi-squared =         0.8060 for     55 degrees of freedom 
# Reduced chi-squared =         0.8024 for     55 degrees of freedom 
# Reduced chi-squared =         0.8001 for     55 degrees of freedom 
# Null hypothesis probability =   8.477563e-01
# Null hypothesis probability =   8.529108e-01
# Null hypothesis probability =   8.560254e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.841e-09   2.912e-09
25- 50  1.905e-08   1.082e-08
50-150  8.425e-08   4.730e-08
15-150  1.081e-07   5.672e-08

Peak spectrum fit

Power-law model

Time interval is from    0.504 sec. to    1.504 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.527360     ( -0.434258   0.379199 )
Norm@50keV  : 4.52933E-03    ( -0.00108671   0.00100731 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          41.94 using 59 PHA bins.
# Reduced chi-squared =         0.7357 for     57 degrees of freedom 
# Null hypothesis probability =   9.325174e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.534109 ( -0.105094  0.106329 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.0019e-08 ( -1.13899e-08  1.14244e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    0.504 sec. to    1.504 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.538893     ( -0.698377   0.367948 )
Epeak [keV] : 9999.36      ( -10000 -10000 )
Norm@50keV  : 4.59095E-03    ( -0.00111139   -0.00458628 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          41.96 using 59 PHA bins.
# Reduced chi-squared =         0.7493 for     56 degrees of freedom 
# Null hypothesis probability =   9.181591e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.536385 ( -0.107689  0.104068 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.99283e-08 ( -1.12694e-08  1.14105e-08 ) ergs/cm2

Band function

Time interval is from    0.504 sec. to    1.504 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.840841   ( 0.840841   0.840841 )
beta        : -0.527369    ( -0.378282   0.434281 )
Epeak [keV] : 13.4504      ( -13.4504 -13.4504 )
Norm@50keV   : 6.91642E-03    ( -0.00375506   65313.3 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          41.94 using 59 PHA bins.
# Reduced chi-squared =         0.7625 for     55 degrees of freedom 
# Null hypothesis probability =   9.024650e-01
 
Photon flux (15-150 keV)    in 1 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

Single BB

 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    : 34.7347  (-9.45372  19.7559)
R^2/D10^2   : 5.61593E-03  (-0.00375187   0.00801547)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          45.70 using 59 PHA bins.
# Reduced chi-squared =         0.8018 for     57 degrees of freedom 
# Null hypothesis probability =   8.585220e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  9.645e-10   5.126e-10
25- 50  6.289e-09   3.118e-09
50-150  4.988e-08   2.312e-08
15-150  5.714e-08   2.172e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (      )
Norm        : 2.12324       (-0.444853     0.444814)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          62.72 using 59 PHA bins.
# Reduced chi-squared =          1.100 for     57 degrees of freedom 
# Null hypothesis probability =   2.806393e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  5.291e-09   3.147e-09
25- 50  1.018e-08   5.990e-09
50-150  2.232e-08   1.315e-08
15-150  3.779e-08   2.220e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 1.54783        (-1.54596      1.13301)
R1^2/D10^2  : 2680.73        (-2703.66      1.60995e+07)
kT2 [keV]   : 37.7207        (-10.8233      25.0863)
R2^2/D10^2  : 4.45938E-03    (-0.00310478   0.00678494)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          38.15 using 59 PHA bins.
# Reduced chi-squared =         0.6936 for     55 degrees of freedom 
# Null hypothesis probability =   9.593087e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.831e-09   1.306e-09
25- 50  5.731e-09   2.891e-09
50-150  5.074e-08   2.962e-08
15-150  5.931e-08   2.839e-08

Pre-slew spectrum (Pre-slew PHA with pre-slew DRM)

Power-law model

 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.788878     ( -0.333927   0.304357 )
Norm@50keV  : 3.10088E-03    ( -0.000555197   0.000537287 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          44.50 using 59 PHA bins.
# Reduced chi-squared =         0.7808 for     57 degrees of freedom 
# Null hypothesis probability =   8.858992e-01
 
Photon flux (15-150 keV)    in 2.976 sec: 0.356540 ( -0.0606195  0.0610069 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.08348e-07 ( -1.85291e-08  1.86426e-08 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.781616     ( -1.06908   0.385311 )
Epeak [keV] : 1.00000E+04      (   )
Norm@50keV  : 3.12305E-03    ( -0.000556876   -0.0031232 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          44.51 using 59 PHA bins.
# Reduced chi-squared =         0.7949 for     56 degrees of freedom 
# Null hypothesis probability =   8.655589e-01
 
Photon flux (15-150 keV)    in 2.976 sec: 0.357391 ( -0.061607  0.059528 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.08165e-07 ( -1.83167e-08  1.87181e-08 ) ergs/cm2

Band function

 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.877018   ( 0.877079   0.877079 )
beta        : -0.788874    ( -0.304085   0.333926 )
Epeak [keV] : 13.0334      ( -13.0327 -13.0327 )
Norm@50keV   : 4.73468E-03    ( -0.00215851   0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          44.50 using 59 PHA bins.
# Reduced chi-squared =         0.8092 for     55 degrees of freedom 
# Null hypothesis probability =   8.432260e-01
 
Photon flux (15-150 keV)    in 2.976 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

S(25-50 keV) vs. S(50-100 keV) plot

S(25-50 keV)  = 1.73e-08
S(50-100 keV) = 4.01e-08

T90 vs. Hardness ratio plot

T90                                   = 2.61599999666214 sec.
Hardness ratio (energy fluence ratio) = 2.31792

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.99156
Count Ratio (50-100 keV) / (15-25 keV) = 2.25589

Mask shadow pattern

IMX = 3.030787575824515E-01, IMY = -7.016731303969656E-02

TIME vs. PHA plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000

TIME vs. DetID plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000

100 us light curve (15-350 keV)

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000

Spacecraft aspect plot

Bright source in the pre-burst/pre-slew/post-slew images

Pre-burst image of 15-350 keV band

Time interval of the image:
-239.696000 -0.020000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']

Pre-slew background subtracted image of 15-350 keV band

Time interval of the image:
-0.020000 2.956000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
  2.4511 -13.6646    2.0  43.1   53.6   0.3689   5.8 ------	UNKNOWN                       
 52.0033 -11.7026    2.1  34.1  134.5   0.1415   5.4 ------	UNKNOWN                       
 14.5889 -43.5374    1.2  17.3   13.0   0.1538   9.6 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
74.604590 286.204610
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
318.7803 -14.6497    2.3  55.4    4.4   3.0664   5.0 ------	UNKNOWN

Plot creation:
Sun May 31 05:51:26 EDT 2015