batgrbproduct analysis for trigger=731887

batgrbproduct Analysis for Trigger=731887

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): Fri Feb 10 13:44:38 EST 2017
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger731887
======================================================================

  Trigger: 00731887      Segment: 000

  BAT Trigger Time: 505787626.624   [s; MET]
      Trigger Stop: 505787630.72   [s; MET]
               UTC: 2017-01-11T00:33:28.182060    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 20.7174783857572   Dec: -32.540066578583  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.62
     Image Trigger?:     NO
     Rate S/N Ratio:     12.5299640861417  [ if not an image trigger ]
     Image S/N Ratio:    8.62

  Flight Position:   [ source = BAT ]
    RA: 20.7174783857572   Dec: -32.540066578583  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 20.6911536665836   Dec: -32.5433455127722  [deg; J2000]  
        { 01h 22m 45.9s , -32d 32' 36.0" }
         +/- 1.75424785571089 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.893121261308565 [arcmin] (formal 1-sigma fit error)
    SNR: 13.6275259166587
 
  Angular difference between Flight and Ground position is 1.345960 arcmin
 
  Partial Coding Fraction: 0.4492188    [ including projection effects ]

  Duration
     T90: 29.8759999275208 +/- 9.71116986695626
        Measured from: -12.2639999985695
                   to: 17.6119999289513     [s; relative to TRIGTIME]
     T50: 10.4799999594688 +/- 2.51501092298271
        Measured from: -5.4200000166893
                   to: 5.05999994277954     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 2.08399999141693     
                   to: 3.08399999141693     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -13.5879999995232     
                   to: 25.3240000009537     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.416881   0.495910   0.372774   0.073434
           0.049630   0.052304   0.046380   0.041823 [error]
 Peak      0.031408   0.043242   0.030534   0.002473
           0.008087   0.009240   0.007944   0.006625 [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 1.26e-07 2.14e-07 2.77e-07 7.24e-07 8.17e-07 1.34e-06   erg/cm2
              Error 2.27e-08 2.42e-08 4.61e-08 2.53e-07 1.09e-07 2.94e-07   erg/cm2
Peak flux Power-law 2.96e-01 2.89e-01 1.98e-01 2.12e-01 8.68e-01 9.95e-01   ph/cm2/s
              Error 1.08e-01 7.16e-02 6.22e-02 1.29e-01 2.10e-01 2.46e-01   ph/cm2/s
 
Fluence   Cutoff-PL 1.26e-07 2.14e-07 2.77e-07 7.47e-07 8.17e-07 1.35e-06   erg/cm2
              Error 2.09e-08 2.52e-08 4.70e-08 3.28e-07 1.04e-07 3.45e-07   erg/cm2
Peak flux Cutoff-PL 2.68e-01 3.24e-01 2.08e-01 7.90e-02 8.55e-01 8.80e-01   ph/cm2/s
              Error 1.20e-01 9.60e-02 7.53e-02 1.33e-01 2.11e-01 2.61e-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    1.627    0.205    -      -           2.25e-03 2.76e-04   46.400 57
CPL   1.625    0.729    9998.1    0.0      2.25e-03 2.29e-03   46.400 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.550    0.386    -      -           6.86e-03 1.75e-03   52.570 57
CPL   0.664    1.651      69.2  -25.1      2.11e-02 1.66e-01   51.500 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: 17.536000 sec.
T50 in the 50-300 keV band: 8.384000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   38.912  -13.588   25.324
T90    29.876  -12.264   17.612
T50    10.480   -5.420    5.060
Peak    1.000    2.084    3.084

Click here for the BAT GCN circular template

Estimated redshift from machine learning (Ukwatta et al. 2016) - may take a few minute to calcaulte

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
   20.6912   -32.5433   0.0140    30.1141  -112.4662         1.3774479     13.628 TRIG_00731887                 
 
Foreground time interval of the image:
-13.588  25.324 (delta_t =  38.912 [sec])
Background time interval of the image:
-239.624 -13.588 (delta_t = 226.036 [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 4.096000

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 4.096000

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 4.096000

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  -13.588 sec. to   25.324 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.62703     ( -0.202389   0.206829 )
Norm@50keV  : 2.24986E-03    ( -0.000278374   0.000273608 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          46.40 using 59 PHA bins.
# Reduced chi-squared =         0.8140 for     57 degrees of freedom 
# Null hypothesis probability =   8.410904e-01
 
Photon flux (15-150 keV)    in 38.91 sec: 0.291601 ( -0.0329  0.032922 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.16246e-07 ( -1.07793e-07  1.09541e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from  -13.588 sec. to   25.324 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.62531     ( -0.671384   0.786135 )
Epeak [keV] : 9998.14      ( -9998.46 -9998.46 )
Norm@50keV  : 2.25488E-03    ( -0.00148343   0.00309307 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          46.40 using 59 PHA bins.
# Reduced chi-squared =         0.8285 for     56 degrees of freedom 
# Null hypothesis probability =   8.162696e-01
 
Photon flux (15-150 keV)    in 38.91 sec: 0.291868 ( -0.033893  0.032878 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.17958e-07 ( -1.22003e-07  8.67347e-08 ) ergs/cm2

Band function

Time interval is from  -13.588 sec. to   25.324 sec.
 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       :    (     )
beta        :     (     )
Epeak [keV] :       (   )
Norm@50keV   :     (     )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in  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]    : 12.5659  (-2.10766  2.64289)
R^2/D10^2   : 5.85931E-02  (-0.0287288   0.0552777)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          74.27 using 59 PHA bins.
# Reduced chi-squared =          1.303 for     57 degrees of freedom 
# Null hypothesis probability =   6.191448e-02
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  7.633e-08   1.677e-08
25- 50  2.533e-07   3.817e-08
50-150  2.477e-07   6.196e-08
15-150  5.773e-07   1.014e-07

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 163.370       (-69.036      -163.211)
Norm        : 1.19492       (-0.144399     0.172176)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          47.17 using 59 PHA bins.
# Reduced chi-squared =         0.8276 for     57 degrees of freedom 
# Null hypothesis probability =   8.201420e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.185e-07   6.436e-08
25- 50  2.223e-07   1.167e-07
50-150  4.540e-07   2.587e-07
15-150  7.947e-07   4.349e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 6.25526        (-1.3887      1.67067)
R1^2/D10^2  : 0.544675        (-0.312671      0.864655)
kT2 [keV]   : 27.8884        (-7.45572      16.4081)
R2^2/D10^2  : 2.85213E-03    (-0.00216113   0.0033436)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          43.55 using 59 PHA bins.
# Reduced chi-squared =         0.7918 for     55 degrees of freedom 
# Null hypothesis probability =   8.672395e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.308e-07   5.963e-08
25- 50  2.116e-07   7.978e-08
50-150  4.888e-07   2.626e-07
15-150  8.312e-07   3.416e-07

Peak spectrum fit

Power-law model

Time interval is from    2.084 sec. to    3.084 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.55049     ( -0.378285   0.393505 )
Norm@50keV  : 6.85899E-03    ( -0.00176515   0.00173292 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.57 using 59 PHA bins.
# Reduced chi-squared =         0.9223 for     57 degrees of freedom 
# Null hypothesis probability =   6.416616e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.868459 ( -0.210105  0.210251 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.45743e-08 ( -1.75903e-08  1.80124e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    2.084 sec. to    3.084 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.663571     ( -2.11716   1.18526 )
Epeak [keV] : 69.1877      ( -19.0834 -69.1879 )
Norm@50keV  : 2.10638E-02    ( -0.0210635   0.311009 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.50 using 59 PHA bins.
# Reduced chi-squared =         0.9196 for     56 degrees of freedom 
# Null hypothesis probability =   6.458207e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.855306 ( -0.211073  0.211394 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.04979e-08 ( -1.87408e-08  1.93475e-08 ) ergs/cm2

Band function

Time interval is from    2.084 sec. to    3.084 sec.
 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       :    (     )
beta        :     (     )
Epeak [keV] :       (   )
Norm@50keV   :     (     )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in  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]    : 12.9724  (-3.52825  4.82538)
R^2/D10^2   : 0.171086  (-0.115948   0.355047)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.46 using 59 PHA bins.
# Reduced chi-squared =         0.9554 for     57 degrees of freedom 
# Null hypothesis probability =   5.711047e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  6.106e-09   3.101e-09
25- 50  2.098e-08   8.152e-09
50-150  2.230e-08   1.190e-08
15-150  4.939e-08   2.154e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 188.187       (-117.197      -184.418)
Norm        : 3.59022       (-0.868518     1.13947)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.91 using 59 PHA bins.
# Reduced chi-squared =         0.9107 for     57 degrees of freedom 
# Null hypothesis probability =   6.658830e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  9.006e-09   5.310e-09
25- 50  1.721e-08   9.880e-09
50-150  3.700e-08   2.145e-08
15-150  6.322e-08   3.619e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 7.46476        (-3.62753      5.53566)
R1^2/D10^2  : 0.813931        (-0.670417      5.81988)
kT2 [keV]   : 25.5871        (-21.7075      -25.521)
R2^2/D10^2  : 1.04056E-02    (-0.0102345   0.127449)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.53 using 59 PHA bins.
# Reduced chi-squared =         0.9187 for     55 degrees of freedom 
# Null hypothesis probability =   6.459675e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  8.920e-09   5.780e-09
25- 50  1.869e-08   1.029e-08
50-150  3.494e-08   1.943e-08
15-150  6.256e-08   3.376e-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: 1.62703     ( -0.202389   0.206829 )
Norm@50keV  : 2.24986E-03    ( -0.000278374   0.000273608 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          46.40 using 59 PHA bins.
# Reduced chi-squared =         0.8140 for     57 degrees of freedom 
# Null hypothesis probability =   8.410904e-01
 
Photon flux (15-150 keV)    in 38.91 sec: 0.291591 ( -0.0328976  0.0329206 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.16141e-07 ( -1.07778e-07  1.09548e-07 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.62888     ( -0.205763   0.20587 )
Epeak [keV] : 9999.36      ( -9999.35 -9999.36 )
Norm@50keV  : 2.25106E-03    ( -0.000970568   0.00309492 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          46.40 using 59 PHA bins.
# Reduced chi-squared =         0.8285 for     56 degrees of freedom 
# Null hypothesis probability =   8.162421e-01
 
Photon flux (15-150 keV)    in 38.91 sec: 0.291570 ( -0.033182  0.032799 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.14655e-07 ( -5.91121e-08  1.10135e-07 ) ergs/cm2

Band function

 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       :    (     )
beta        :     (     )
Epeak [keV] :       (   )
Norm@50keV   :     (     )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in  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)  = 2.14e-07
S(50-100 keV) = 2.77e-07

T90 vs. Hardness ratio plot

T90                                   = 29.8759999275208 sec.
Hardness ratio (energy fluence ratio) = 1.29439

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.18957
Count Ratio (50-100 keV) / (15-25 keV) = 0.894198

Mask shadow pattern

IMX = -2.216439715608496E-01, IMY = 5.359891651423334E-01

TIME vs. PHA plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000

TIME vs. DetID plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000

100 us light curve (15-350 keV)

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000

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:
-239.624000 -13.588000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 15.3041  37.7432    2.4  51.6    8.6   2.9010   4.9 ------	UNKNOWN                       
 80.0230 -57.3032    2.3  57.8 -170.6   6.1351   4.9 ------	UNKNOWN                       
 23.5393 -30.6580    2.8  27.1 -113.9   1.0384   4.2 ------	UNKNOWN                       
354.9989  15.6327    2.5  50.7  -28.2   2.1505   4.6 ------	UNKNOWN                       
 39.4999 -63.2053    3.4  54.8 -146.1   3.7418   3.4 ------	UNKNOWN                       
  8.4323 -38.6886    3.0  41.5 -108.2   3.2054   3.8 ------	UNKNOWN

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

Time interval of the image:
-13.588000 25.324000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 49.8681 -32.4084    2.5  25.7 -165.7   0.3157   4.5 ------	UNKNOWN                       
 20.6912 -32.5433    0.8  30.1 -112.5   1.3768  13.6 ------	UNKNOWN                       
353.1037  10.2308    2.2  50.3  -35.6   1.0978   5.2 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
90.876600 782.486000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 38.0733  -4.1235    2.3  32.7   51.3  12.1039   5.0 ------	UNKNOWN                       
352.9685  18.9954    2.4  58.0  -13.4  34.7273   4.8 ------	UNKNOWN

Plot creation:
Fri Feb 10 18:01:32 EST 2017