batgrbproduct analysis for trigger=131560

batgrbproduct Analysis for Trigger=131560

Analysis Summary

Notes:

1) No attempt has been made to eliminate the non-significant decimal places.
2) This batgrbproduct analysis is done of the amount of data for this trigger downloaded to date.
3) This batgrbproduct analysis is using the flight position for the mask-weighting calculation.
4) This page will be updated for up to 10 downlinks after the trigger.

Special note: Due to the low partial coding fraction, the refined position can only be found using the DETECTION mask. Therefore, the refined position and the mask shadow pattern shown here are from analyses with DETECTION mask, everything else uses the FLUX mask.

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time (local time): Fri Dec 18 21:04:50 EST 2015
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger131560
======================================================================

  Trigger: 00131560      Segment: 000

  BAT Trigger Time: 139472944.768   [s; MET]
      Trigger Stop: 139472945.28   [s; MET]
               UTC: 2005-06-03T06:29:05.214200    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 39.9781544550354   Dec: -25.1827240278029  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    16
     Image Trigger?:     NO
     Rate S/N Ratio:     255.998046867549  [ if not an image trigger ]
     Image S/N Ratio:    16

  Flight Position:   [ source = BAT ]
    RA: 39.9781544550354   Dec: -25.1827240278029  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 39.9837592694298   Dec: -25.1741970628116  [deg; J2000]  
        { 02h 39m 56.1s , -25d 10' 27.1" }
         +/- 1.22285022356861 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.442972171598172 [arcmin] (formal 1-sigma fit error)
    SNR: 22.8191480847494
    Note: The refined position is found by using the DETECTION mask.
 
  Angular difference between Flight and Ground position is 0.595293 arcmin
 
  Partial Coding Fraction: 0.04833984    [ including projection effects ]

  Duration
     T90: 21 +/- 8.48528137423857
        Measured from: -9.76800000667572
                   to: 11.2319999933243     [s; relative to TRIGTIME]
     T50: 3 +/- 1
        Measured from: -1.76800000667572
                   to: 1.23199999332428     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.76800000667572     
                   to: 0.23199999332428     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -17.7680000066757     
                   to: 23.2319999933243     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     2.265383   3.944555   3.896862   1.550798
           0.147322   0.164782   0.156296   0.124605 [error]
 Peak      0.333714   0.797848   0.952072   0.389323
           0.037445   0.052171   0.058006   0.045171 [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 7.93e-07 1.74e-06 3.00e-06 1.20e-05 8.21e-06 1.75e-05   erg/cm2
              Error 6.98e-08 9.06e-08 1.48e-07 1.35e-06 3.77e-07 1.42e-06   erg/cm2
Peak flux Power-law 3.79e+00 5.44e+00 5.79e+00 1.14e+01 1.86e+01 2.65e+01   ph/cm2/s
              Error 5.12e-01 4.56e-01 4.23e-01 1.75e+00 1.28e+00 2.06e+00   ph/cm2/s
 
Fluence   Cutoff-PL 7.82e-07 1.75e-06 3.02e-06 1.10e-05 8.19e-06 1.65e-05   erg/cm2
              Error 8.48e-08 9.71e-08 1.70e-07 2.29e-06 3.90e-07 2.47e-06   erg/cm2
Peak flux Cutoff-PL 3.36e+00 5.63e+00 6.19e+00 7.11e+00 1.84e+01 2.23e+01   ph/cm2/s
              Error 6.34e-01 5.12e-01 5.67e-01 3.22e+00 1.29e+00 3.35e+00   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    1.214    0.077    -      -           1.98e-02 8.59e-04   53.280 57
CPL   1.116    0.202     478.2  -92.1      2.19e-02 4.63e-03   53.330 56
 
The chi2 of BB fit is -------- 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    0.909    0.112    -      -           1.62e-01 1.11e-02   68.670 57
CPL   0.412    0.491     184.0 2766.8      2.72e-01 1.43e-01   65.360 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: 9.088000 sec.
T50 in the 50-300 keV band: 1.536000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   41.000  -17.768   23.232
T90    21.000   -9.768   11.232
T50     3.000   -1.768    1.232
Peak    1.000   -0.768    0.232

Click here for the BAT GCN circular template

Special notes of this burst

Image

Pre-slew 15.0-350.0 keV image (Event data; DETECTION mask)

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
   39.9838   -25.1742   0.0084    41.4871   -99.2586        10.1082200     22.819 TRIG_00131560                 
 
Foreground time interval of the image:
-17.768  33.232 (delta_t =  51.000 [sec])
Background time interval of the image:
-299.768 -17.768 (delta_t = 282.000 [sec])

Lightcurves

Notes:

1) All plots contain as much data as has been downloaded to date.
2) The mask-weighted light curves are using the flight position.
3) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
4) 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.
5) 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.
6) 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 0.512000

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 0.512000

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 0.512000

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) For long bursts, a spectral fit of 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.
4) For short bursts (T90<1sec), the specrtum is also fit with Blackbody, OTTB, and Double Blackbody.

Time averaged spectrum fit using the pre-slew DRM

Power-law model

Time interval is from  -17.768 sec. to   23.232 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.21362     ( -0.0772474   0.0766446 )
Norm@50keV  : 1.98034E-02    ( -0.00085971   0.000858736 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.28 using 59 PHA bins.
# Reduced chi-squared =         0.9347 for     57 degrees of freedom 
# Null hypothesis probability =   6.155090e-01
 
Photon flux (15-150 keV)    in 41 sec: 2.32907 ( -0.107277  0.107484 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.20615e-06 ( -3.76998e-07  3.77593e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from  -17.768 sec. to   23.232 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.11558     ( -0.305203   0.0997353 )
Epeak [keV] : 478.162      ( -594.023 -778.304 )
Norm@50keV  : 2.19281E-02    ( -0.00195094   0.00731059 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.33 using 59 PHA bins.
# Reduced chi-squared =         0.9523 for     56 degrees of freedom 
# Null hypothesis probability =   5.766602e-01
 
Photon flux (15-150 keV)    in 41 sec: 2.32232 ( -0.11112  0.11111 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.1893e-06 ( -3.90976e-07  3.88557e-07 ) ergs/cm2

Band function

Time interval is from  -17.768 sec. to   23.232 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 3.29970   ( -12.1003   -4.26941 )
beta        : -1.26857    ( -0.0865336   0.0855974 )
Epeak [keV] : 29.2810      ( -10.0281 89.4797 )
Norm@50keV   : 44.2330    ( -44.2221   559.018 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.87 using 59 PHA bins.
# Reduced chi-squared =         0.9068 for     55 degrees of freedom 
# Null hypothesis probability =   6.702928e-01
 
Photon flux (15-150 keV)    in 41 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]    : 20.1380  (  )
R^2/D10^2   : 0.103428  (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =         173.53 using 59 PHA bins.
# Reduced chi-squared =         3.0443 for     57 degrees of freedom 
# Null hypothesis probability =   1.064959e-13
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.306e-07   2.950e-08
25- 50  1.654e-06   1.212e-07
50-150  4.978e-06   3.649e-07
15-150  6.963e-06   3.895e-07

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (-6.16722      -200)
Norm        : 9.84765       (-0.433143     0.433143)
------------------------------------------------------------
#Fit statistic : Chi-Squared =         112.96 using 59 PHA bins.
# Reduced chi-squared =         1.9818 for     57 degrees of freedom 
# Null hypothesis probability =   1.466510e-05
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.006e-06   4.715e-08
25- 50  1.935e-06   1.004e-07
50-150  4.243e-06   2.083e-07
15-150  7.183e-06   3.547e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 8.16552        (-1.2308      1.4379)
R1^2/D10^2  : 1.26062        (-0.499592      0.903223)
kT2 [keV]   : 35.1492        (-5.20486      8.61574)
R2^2/D10^2  : 1.42793E-02    (-0.00698463   0.00989531)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.24 using 59 PHA bins.
# Reduced chi-squared =         0.9499 for     55 degrees of freedom 
# Null hypothesis probability =   5.806169e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  7.346e-07   1.111e-07
25- 50  1.815e-06   2.337e-07
50-150  5.715e-06   7.974e-07
15-150  8.265e-06   1.080e-06

Peak spectrum fit

Power-law model

Time interval is from   -0.768 sec. to    0.232 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.909447     ( -0.112733   0.110962 )
Norm@50keV  : 0.161848    ( -0.0111241   0.0110876 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          68.67 using 59 PHA bins.
# Reduced chi-squared =          1.205 for     57 degrees of freedom 
# Null hypothesis probability =   1.383290e-01
 
Photon flux (15-150 keV)    in 1 sec: 18.5785 ( -1.27817  1.27843 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.80974e-06 ( -1.34855e-07  1.35236e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.768 sec. to    0.232 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.412439     ( -0.517776   0.464939 )
Epeak [keV] : 184.019      ( -65.8828 5467.71 )
Norm@50keV  : 0.271521    ( -0.101752   0.184516 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.36 using 59 PHA bins.
# Reduced chi-squared =          1.167 for     56 degrees of freedom 
# Null hypothesis probability =   1.836086e-01
 
Photon flux (15-150 keV)    in 1 sec: 18.4049 ( -1.29  1.2899 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.78303e-06 ( 0  0 ) ergs/cm2

Band function

Time interval is from   -0.768 sec. to    0.232 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 0.608568   ( -1.48676   -0.628656 )
beta        : -1.12422    ( -2.23398   0.20996 )
Epeak [keV] : 71.0523      ( -22.2517 123.385 )
Norm@50keV   : 1.12305    ( -1.2055   706.286 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          63.84 using 59 PHA bins.
# Reduced chi-squared =          1.161 for     55 degrees of freedom 
# Null hypothesis probability =   1.935947e-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]    : 22.5397  (-1.91394  2.17576)
R^2/D10^2   : 0.652884  (-0.16287   0.20825)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          90.22 using 59 PHA bins.
# Reduced chi-squared =          1.583 for     57 degrees of freedom 
# Null hypothesis probability =   3.324629e-03
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  6.070e-08   8.220e-09
25- 50  3.255e-07   3.015e-08
50-150  1.236e-06   1.320e-07
15-150  1.622e-06   1.400e-07

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 199.363       (      )
Norm        : 71.5219       (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =         150.00 using 59 PHA bins.
# Reduced chi-squared =         2.6317 for     57 degrees of freedom 
# Null hypothesis probability =   2.668078e-10
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.781e-07   1.455e-08
25- 50  3.426e-07   5.210e-08
50-150  7.514e-07   2.699e-07
15-150  1.272e-06   2.906e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 11.1321        (-3.28659      4.28147)
R1^2/D10^2  : 3.08854        (-1.56075      4.31297)
kT2 [keV]   : 41.3335        (-11.7674      111.073)
R2^2/D10^2  : 8.05037E-02    (-0.0741301   0.161027)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.13 using 59 PHA bins.
# Reduced chi-squared =          1.166 for     55 degrees of freedom 
# Null hypothesis probability =   1.869852e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  9.748e-08   3.534e-08
25- 50  3.495e-07   1.319e-07
50-150  1.349e-06   6.264e-07
15-150  1.797e-06   7.325e-07

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: 1.21362     ( -0.0772474   0.0766446 )
Norm@50keV  : 1.98034E-02    ( -0.00085971   0.000858736 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.28 using 59 PHA bins.
# Reduced chi-squared =         0.9347 for     57 degrees of freedom 
# Null hypothesis probability =   6.155090e-01
 
Photon flux (15-150 keV)    in 41 sec: 2.32907 ( -0.107277  0.107484 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.20615e-06 ( -3.76998e-07  3.77593e-07 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.11558     ( -0.305203   0.0997353 )
Epeak [keV] : 478.162      ( -594.023 -778.304 )
Norm@50keV  : 2.19281E-02    ( -0.00195209   0.00731059 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.33 using 59 PHA bins.
# Reduced chi-squared =         0.9523 for     56 degrees of freedom 
# Null hypothesis probability =   5.766602e-01
 
Photon flux (15-150 keV)    in 41 sec: 2.32232 ( -0.11112  0.11111 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.1893e-06 ( -3.90976e-07  3.88557e-07 ) ergs/cm2

Band function

 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 3.29970   ( -4.57224   -4.26941 )
beta        : -1.26857    ( -0.0865336   0.0855974 )
Epeak [keV] : 29.2810      ( -10.0281 89.4797 )
Norm@50keV   : 44.2330    ( -44.2221   303.643 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.87 using 59 PHA bins.
# Reduced chi-squared =         0.9068 for     55 degrees of freedom 
# Null hypothesis probability =   6.702928e-01
 
Photon flux (15-150 keV)    in 41 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)  = 1.74e-06
S(50-100 keV) = 3.00e-06

T90 vs. Hardness ratio plot

T90                                   = 21 sec.
Hardness ratio (energy fluence ratio) = 1.72414

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.74123
Count Ratio (50-100 keV) / (15-25 keV) = 1.72018

Mask shadow pattern (with DETECTION mask)

IMX = -1.422790174225133E-01, IMY = 8.728029609124724E-01

TIME vs. PHA plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000

TIME vs. DetID plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000

100 us light curve (15-350 keV)

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000

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:
-299.768000 -17.768000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
151.8086 -70.1750    2.6  47.4   17.6   1.8360   4.4 ------	UNKNOWN

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

Time interval of the image:
-17.768000 23.232000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']

Post-slew image of 15-350 keV band

Time interval of the image:

Plot creation:
Fri Dec 18 21:08:12 EST 2015