batgrbproduct Analysis for Trigger=731887

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time (local time): Wed Jan 11 16:53:27 EST 2017
             Host Name: bat1
   Current Working Dir: /local/data/bat1/prebascript/trigger731887/batgroup_hand_proc
======================================================================

  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: 20.6864648869253   Dec: -32.5430137370688  [deg; J2000]  
        { 01h 22m 44.8s , -32d 32' 34.8" }
         +/- 1.95001389359198 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.02304371761089 [arcmin] (formal 1-sigma fit error)
    SNR: 11.7159848242223
 
  Angular difference between Flight and Ground position is 1.578601 arcmin
 
  Partial Coding Fraction: 0.4492188    [ including projection effects ]

  Duration
     T90: 33.4119999408722 +/- 14.4345220603801
        Measured from: -12.3000000119209
                   to: 21.1119999289513     [s; relative to TRIGTIME]
     T50: 10.7319999337196 +/- 3.0019966833292
        Measured from: -5.41600000858307
                   to: 5.31599992513657     [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: 35.1559999585152     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.470843   0.496165   0.328647   0.081114
           0.056300   0.056872   0.050789   0.046066 [error]
 Peak      0.036880   0.035334   0.028466   0.004041
           0.008356   0.009087   0.007698   0.006589 [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 1.35e-07 2.18e-07 2.64e-07 6.30e-07 7.97e-07 1.25e-06   erg/cm2
              Error 2.55e-08 2.67e-08 5.02e-08 2.47e-07 1.17e-07 2.94e-07   erg/cm2
Peak flux Power-law 3.44e-01 3.12e-01 1.95e-01 1.86e-01 9.28e-01 1.04e+00   ph/cm2/s
              Error 1.16e-01 7.08e-02 6.14e-02 1.14e-01 2.09e-01 2.38e-01   ph/cm2/s
 
Fluence   Cutoff-PL 1.36e-07 2.18e-07 2.64e-07 6.18e-07 7.94e-07 1.15e-06   erg/cm2
              Error 2.55e-08 2.66e-08 5.03e-08 3.97e-07 1.26e-07 4.13e-07   erg/cm2
Peak flux Cutoff-PL 3.28e-01 3.30e-01 2.00e-01 1.09e-01 9.21e-01 9.66e-01   ph/cm2/s
              Error 1.28e-01 9.02e-02 6.79e-02 1.53e-01 2.10e-01 2.65e-01   ph/cm2/s
 
Fluence        Band -------- -------- -------- -------- -------- --------   erg/cm2
              Error -------- -------- -------- -------- -------- --------   erg/cm2
Peak flux      Band 3.30e-01 3.27e-01 2.00e-01 1.17e-01 9.20e-01 9.77e-01   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    1.719    0.225    -      -           1.77e-03 2.46e-04   70.660 57
CPL   1.664    0.774     262.0    0.0      1.90e-03 0.00e+00   70.690 56
 
The chi2 of BB fit is Chi-Squared Chi-Squared which shows a significant improvement in the fit over a PL.
Check the BB fit.
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.678    0.382    -      -           7.04e-03 1.75e-03   47.230 57
CPL   1.247    1.459      80.3   -0.1      1.22e-02 5.46e-02   46.940 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: 18.048000 sec.
T50 in the 50-300 keV band: 9.280000 sec.
 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   48.744  -13.588   35.156
T90    33.412  -12.300   21.112
T50    10.732   -5.416    5.316
Peak    1.000    2.084    3.084

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
   20.6865   -32.5430   0.0163    30.1162  -112.4604         1.3509198     11.716 TRIG_00731887                 
 
Foreground time interval of the image:
-13.588  35.156 (delta_t =  48.744 [sec])
Background time interval of the image:
-239.624 -13.588 (delta_t = 226.036 [sec])

Lightcurves

Notes:

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

8 ms binning

From T100_start-3 s to T100_start+3 s

2 ms binning

From T100_start-1 s to T100_start+1 s

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

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

Spectra

Notes:

Time averaged spectrum fit using the pre-slew DRM

Power-law model
Time interval is from  -13.588 sec. to   35.156 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.71936     ( -0.221584   0.227998 )
Norm@50keV  : 1.76925E-03    ( -0.000249069   0.000243557 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          70.66 using 59 PHA bins.
# Reduced chi-squared =          1.240 for     57 degrees of freedom 
# Null hypothesis probability =   1.055707e-01
 
Photon flux (15-150 keV)    in 48.74 sec: 0.236588 ( -0.029071  0.0290859 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.9725e-07 ( -1.15991e-07  1.18454e-07 ) ergs/cm2
 
Cutoff power-law model
Time interval is from  -13.588 sec. to   35.156 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.66385     ( -0.817053   0.731366 )
Epeak [keV] : 261.964      (   )
Norm@50keV  : 1.90283E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          70.69 using 59 PHA bins.
# Reduced chi-squared =          1.262 for     56 degrees of freedom 
# Null hypothesis probability =   8.937546e-02
 
Photon flux (15-150 keV)    in 48.74 sec: 0.236607 ( -0.029147  0.028991 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.94462e-07 ( -1.325e-07  1.20066e-07 ) ergs/cm2
 
Band function
Time interval is from  -13.588 sec. to   35.156 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 4.95427   ( -14.3445   -4.95427 )
beta        : -1.87284    ( -0.302907   0.267764 )
Epeak [keV] : 23.4547      ( -7.12097 4.59521 )
Norm@50keV   : 326.933    ( -39.6151   3235.21 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          67.65 using 59 PHA bins.
# Reduced chi-squared =          1.230 for     55 degrees of freedom 
# Null hypothesis probability =   1.177183e-01
 
Photon flux (15-150 keV)    in 48.74 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]    : 10.7978  (-1.74092  2.15827)
R^2/D10^2   : 8.24413E-02  (-0.0402578   0.0763813)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          89.94 using 59 PHA bins.
# Reduced chi-squared =          1.578 for     57 degrees of freedom 
# Null hypothesis probability =   3.521382e-03
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  9.750e-08   2.315e-08
25- 50  2.691e-07   4.608e-08
50-150  1.747e-07   5.895e-08
15-150  5.414e-07   9.875e-08
Thermal bremsstrahlung (OTTB)
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 124.724       (-52.4626      -123.019)
Norm        : 0.992603       (-0.144412     0.204967)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          71.51 using 59 PHA bins.
# Reduced chi-squared =          1.255 for     57 degrees of freedom 
# Null hypothesis probability =   9.350041e-02
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.258e-07   2.352e-08
25- 50  2.265e-07   7.433e-08
50-150  4.119e-07   2.412e-07
15-150  7.643e-07   3.109e-07
Double BB
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 6.98960        (-1.74516      2.17945)
R1^2/D10^2  : 0.336880        (-0.203209      0.590843)
kT2 [keV]   : 36.0726        (-16.0713      -36.0805)
R2^2/D10^2  : 8.95554E-04    (-0.000870746   0.00339353)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          68.05 using 59 PHA bins.
# Reduced chi-squared =          1.237 for     55 degrees of freedom 
# Null hypothesis probability =   1.112355e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.365e-07   4.518e-08
25- 50  2.277e-07   8.607e-08
50-150  4.640e-07   2.509e-07
15-150  8.283e-07   3.484e-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: 1.67807     ( -0.370437   0.394341 )
Norm@50keV  : 7.04279E-03    ( -0.00177886   0.00172248 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          47.23 using 59 PHA bins.
# Reduced chi-squared =         0.8286 for     57 degrees of freedom 
# Null hypothesis probability =   8.184910e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.928309 ( -0.209208  0.209286 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.53247e-08 ( -1.69387e-08  1.73532e-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: 1.24684     ( -1.73961   1.17917 )
Epeak [keV] : 80.2648      ( -80.1515 -80.2648 )
Norm@50keV  : 1.21736E-02    ( -0.0121736   0.096969 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          46.94 using 59 PHA bins.
# Reduced chi-squared =         0.8382 for     56 degrees of freedom 
# Null hypothesis probability =   8.005507e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.920543 ( -0.210265  0.210637 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.33464e-08 ( -1.79084e-08  1.83925e-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       : -1.26252   ( -1.02252   1.30697 )
beta        : -9.37167    ( 9.37127   19.3713 )
Epeak [keV] : 83.1856      ( -49.1328 -83.1575 )
Norm@50keV   : 1.18412E-02    ( -0.00607946   0.0120342 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          46.94 using 59 PHA bins.
# Reduced chi-squared =         0.8534 for     55 degrees of freedom 
# Null hypothesis probability =   7.719716e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.920299 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.41621e-08 ( 0  0 ) ergs/cm2
 
Single BB
 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    : 12.5855  (-3.52255  4.5505)
R^2/D10^2   : 0.195609  (-0.13136   0.437394)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.44 using 59 PHA bins.
# Reduced chi-squared =         0.9199 for     57 degrees of freedom 
# Null hypothesis probability =   6.467005e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  6.570e-09   3.004e-09
25- 50  2.184e-08   8.338e-09
50-150  2.145e-08   1.247e-08
15-150  4.985e-08   1.972e-08
Thermal bremsstrahlung (OTTB)
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 139.152       (-78.8053      -136.826)
Norm        : 3.88386       (-0.947879     1.37312)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          46.94 using 59 PHA bins.
# Reduced chi-squared =         0.8235 for     57 degrees of freedom 
# Null hypothesis probability =   8.265327e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.003e-08   5.615e-09
25- 50  1.839e-08   1.040e-08
50-150  3.516e-08   2.243e-08
15-150  6.358e-08   3.840e-08
Double BB
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 6.04546        (-2.7567      4.45445)
R1^2/D10^2  : 1.87579        (-1.57291      17.766)
kT2 [keV]   : 22.9353        (-10.1405      82.3543)
R2^2/D10^2  : 1.67209E-02    (-0.0163491   0.105701)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          46.26 using 59 PHA bins.
# Reduced chi-squared =         0.8411 for     55 degrees of freedom 
# Null hypothesis probability =   7.932233e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.080e-08   6.500e-09
25- 50  1.798e-08   9.720e-09
50-150  3.486e-08   2.041e-08
15-150  6.364e-08   3.421e-08
Plot creation:
Wed Jan 11 17:58:19 EST 2017