GRB131002A

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: Sat Jan 11 22:56:47 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger572721
======================================================================

  Trigger: 00572721      Segment: 000

  BAT Trigger Time: 402389672.384   [s; MET]
      Trigger Stop: 402389672.64   [s; MET]
               UTC: 2013-10-02T06:54:21.282820    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 253.275042794748   Dec: 82.0571667841111  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.73
     Image Trigger?:     NO
     Rate S/N Ratio:     15.7162336455017  [ if not an image trigger ]
     Image S/N Ratio:    8.73

  Analysis Position:   [ source = BAT ]
    RA: 253.275042794748   Dec: 82.0571667841111  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 253.275   Dec: 82.0572  [deg; J2000]
        { 16h 53m 06.0s , +82d 03' 25.9" }
        +/- 2.16089423164 [arcmin] (estimated 90% radius based on SNR)
    SNR: 10.1187607151
 
 
  Angular difference between the analysis and refined position is 0.002024 arcmin
 
  Partial Coding Fraction: 0.71875    [ including projection effects ]

  Duration
     T90: 56.5279999375343 +/- 4.10830962682656
        Measured from: 0.11599999666214
                   to: 56.6439999341965     [s; relative to TRIGTIME]
     T50: 4.68799996376038 +/- 32.1173271437912
        Measured from: 42.6999999880791
                   to: 47.3879999518394     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 43.1719999909401     
                   to: 44.1719999909401     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.203999996185303     
                   to: 60.727999985218     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.294550   0.373123   0.283518   0.023621
           0.039117   0.040786   0.035990   0.031914 [error]
 Peak      0.035791   0.061399   0.050256   0.013092
           0.005326   0.005795   0.005218   0.004086 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   60.932   -0.204   60.728
T90    56.528    0.116   56.644
T50     4.688   42.700   47.388
Peak    1.000   43.172   44.172
 
 
====== 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      -1.616    -0.206      0.200       -           -               -         1.00e-03     -1.33e-04          1.32e-04      56.140   57
CPL     -0.538    -0.845      1.027       61.866     -13.434        58.540      3.85e-03     -3.85e-03          9.61e-03      51.180   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      -1.204     -0.176     0.179       -           -               -         1.03e-02     -1.06e-03          1.06e-03      52.190   57
CPL     -1.111     -0.255     0.691      499.990    -499.990      -499.990      1.15e-02     -1.15e-02          1.31e-02      52.130   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   8.55e-08  1.46e-07  1.91e-07  5.05e-07  5.60e-07  9.27e-07   erg/cm2
      90%_error_low -1.50e-08 -1.76e-08 -3.34e-08 -1.58e-07 -7.95e-08 -1.95e-07   erg/cm2
      90%_error_hi   1.55e-08  1.76e-08  3.37e-08  2.00e-07  8.11e-08  2.29e-07   erg/cm2
Peak flux       PL   3.20e-01  3.84e-01  3.33e-01  4.95e-01  1.21e+00  1.53e+00   ph/cm2/s
      90%_error_low -5.99e-02 -4.56e-02 -4.06e-02 -1.16e-01 -1.27e-01 -1.67e-01   ph/cm2/s
      90%_error_hi   6.31e-02  4.49e-02  4.01e-02  1.37e-01  1.27e-01  1.71e-01   ph/cm2/s
 
Fluence        CPL   7.51e-08  1.66e-07  1.94e-07  1.18e-07  5.11e-07  5.52e-07   erg/cm2
      90%_error_low -1.78e-08 -2.32e-08 -3.93e-08 -7.60e-08 -8.18e-08 -1.13e-07   erg/cm2
      90%_error_hi   1.78e-08  2.40e-08  3.87e-08  2.29e-07  8.74e-08  2.35e-07   erg/cm2
Peak flux      CPL   3.14e-01  3.87e-01  3.37e-01  4.41e-01  1.21e+00  1.48e+00   ph/cm2/s
      90%_error_low -7.00e-02 -4.83e-02 -4.32e-02 -2.32e-01 -1.29e-01 -2.69e-01   ph/cm2/s
      90%_error_hi   6.14e-02  5.21e-02  4.67e-02  8.66e-02  1.29e-01  2.10e-01   ph/cm2/s
 
======================================================================

Special notes of this burst

Image

Pre-slew 25.0-100.0 keV image (Event data)

#RAcent DECcent POSerr Theta  Phi  Peak_Cts  SNR Name
253.275 82.057 0.000 24.101 141.952 0.048 10.119 TRIG_00572721
 
Image time interval: 0.000 to 0.256 [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

Multiple GTIs in the spectrum
tstart tstop
-0.204000 41.637100
42.616000 60.728000
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.61615     ( -0.206233   0.199789 )
Norm@50keV  : 1.00125E-03    ( -0.000133397   0.000131501 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.14 using 59 PHA bins.
# Reduced chi-squared =         0.9849 for     57 degrees of freedom 
# Null hypothesis probability =   5.074476e-01
 
Photon flux (15-150 keV)    in 59.95 sec: 0.129322 ( -0.015505  0.015507 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.60375e-07 ( -7.95483e-08  8.11285e-08 ) ergs/cm2

Cutoff power-law model

Multiple GTIs in the spectrum
tstart tstop
-0.204000 41.637100
42.616000 60.728000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.538106     ( -0.845274   1.0274 )
Epeak [keV] : 61.8656      ( -13.4341 58.5402 )
Norm@50keV  : 3.84868E-03    ( -0.00384861   0.00961201 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.18 using 59 PHA bins.
# Reduced chi-squared =         0.9139 for     56 degrees of freedom 
# Null hypothesis probability =   6.575712e-01
 
Photon flux (15-150 keV)    in 59.95 sec: 0.124537 ( -0.015866  0.015899 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.10951e-07 ( -8.1761e-08  8.73633e-08 ) ergs/cm2

1-s peak spectrum fit

Power-law model

Time interval is from   43.172 sec. to   44.172 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.20427     ( -0.17605   0.178515 )
Norm@50keV  : 1.03117E-02    ( -0.00105908   0.00105854 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.19 using 59 PHA bins.
# Reduced chi-squared =         0.9156 for     57 degrees of freedom 
# Null hypothesis probability =   6.557237e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.21113 ( -0.12658  0.12669 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.04503e-07 ( -1.20715e-08  1.21645e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   43.172 sec. to   44.172 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.1114     ( -0.255028   0.690849 )
Epeak [keV] : 499.990      ( -499.998 -499.998 )
Norm@50keV  : 1.14623E-02    ( -0.0114623   0.0130912 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.13 using 59 PHA bins.
# Reduced chi-squared =         0.9308 for     56 degrees of freedom 
# Null hypothesis probability =   6.222384e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.20743 ( -0.12899  0.12863 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.03841e-07 ( -1.30192e-08  1.12205e-08 ) ergs/cm2

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 56.528 sec.
Hardness ratio (energy fluence ratio) = 1.30487844882

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

S(15-50 keV)  = 2.3180413e-07
S(50-150 keV) = 3.285748e-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 = -0.352277607787, IMY = -0.275704590254

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:
-153.683400 -0.204000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
331.5494  68.6092    3.0  42.3  121.4   1.8547   3.9 ------	UNKNOWN                       
 87.8046  64.4268    2.6  23.5   51.5   0.6020   4.4 ------	UNKNOWN

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

Time interval of the image:
-0.204000 10.316670
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
128.2438  17.3262    2.5  53.3  -32.2   0.5482   4.7 ------	UNKNOWN                       
208.1041  32.8480    2.1  48.6 -131.0   0.7686   5.7 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
55.716600 962.719100
1772.616000 1904.237400
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.2192  35.4311    0.0  46.6 -155.4  -2.0351  -1.7   12.8	Her X-1                       
299.6612  35.2066    3.4  49.6  154.6   7.0009   3.4    3.5	Cyg X-1                       
308.0667  40.9703    2.2  44.8  144.5   8.2765   5.2    2.2	Cyg X-3                       
149.9858  41.4961    4.5  50.8  -44.6   7.7601   2.6 ------	UNKNOWN                       
203.5771  44.0882    4.0  41.1  -98.0  10.2563   2.9 ------	UNKNOWN

Analysis Summary

Notes:

Image

Pre-slew 25.0-100.0 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 source in the pre-burst/pre-slew/post-slew images

Pre-burst image of 15-350 keV band

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

Post-slew image of 15-350 keV band

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