GRB131024B

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: Wed Jun 10 12:46:02 EDT 2015
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger575754
======================================================================

  Trigger: 00575754      Segment: 000

  BAT Trigger Time: 404343342.592   [s; MET]
      Trigger Stop: 404343346.688   [s; MET]
               UTC: 2013-10-24T21:35:31.401340    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 144.402931552422   Dec: 44.2397294748877  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    6.93
     Image Trigger?:     NO
     Rate S/N Ratio:     10.770329614269  [ if not an image trigger ]
     Image S/N Ratio:    6.93

  Analysis Position:   [ source = BAT ]
    RA: 144.402931552422   Dec: 44.2397294748877  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 144.473118827521   Dec: 44.2621641391518  [deg; J2000]  
        { 09h 37m 53.5s , +44d 15' 43.8" }
         +/- 1.84302642275172 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.756252295468365 [arcmin] (formal 1-sigma fit error)
    SNR: 12.6995279353668
 
  Angular difference between the analysis and refined position is 3.303182 arcmin
 
  Partial Coding Fraction: 0.40625    [ including projection effects ]

  Duration
     T90: 96.8160000443459 +/- 27.4064459345517
        Measured from: -4.77600002288818
                   to: 92.0400000214577     [s; relative to TRIGTIME]
     T50: 41.0239999890327 +/- 13.3243236463996
        Measured from: 4.88800001144409
                   to: 45.9120000004768     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 1.03600001335144     
                   to: 2.03600001335144     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -8.28000003099442     
                   to: 101.01599997282     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.460638   0.456605   0.849941   0.249252
           0.077233   0.081109   0.073533   0.068567 [error]
 Peak      0.008705   0.022576   0.056342   0.017323
           0.008394   0.008888   0.008918   0.007983 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  109.296   -8.280  101.016
T90    96.816   -4.776   92.040
T50    41.024    4.888   45.912
Peak    1.000    1.036    2.036
 
 
====== 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      -0.998    -0.214      0.222       -           -               -         1.23e-03     -1.47e-04          1.46e-04      64.080   57
CPL     -0.865    -0.329      1.022      513.471    -513.471      -513.471      1.40e-03     -2.82e-04          1.21e-03      64.010   56
 
 
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: N/A)
 
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      -0.570     -0.393     0.446       -           -               -         6.69e-03     -1.90e-03          1.85e-03      73.270   57
CPL      3.756     -2.575    -3.756       91.671     -19.486        32.676      1.85e-01     -1.85e-01          1.94e+01      65.580   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   1.08e-07  2.70e-07  5.40e-07  2.71e-06  1.46e-06  3.62e-06   erg/cm2
      90%_error_low -2.63e-08 -4.08e-08 -6.96e-08 -7.43e-07 -1.82e-07 -7.81e-07   erg/cm2
      90%_error_hi   2.88e-08  3.99e-08  6.87e-08  9.35e-07  1.83e-07  9.50e-07   erg/cm2
Peak flux       PL   1.14e-01  2.00e-01  2.70e-01  7.48e-01  7.83e-01  1.33e+00   ph/cm2/s
      90%_error_low -5.67e-02 -7.19e-02 -6.47e-02 -3.07e-01 -1.98e-01 -3.55e-01   ph/cm2/s
      90%_error_hi   7.44e-02  7.43e-02  6.47e-02  4.31e-01  2.02e-01  4.07e-01   ph/cm2/s
 
Fluence        CPL   1.04e-07  2.71e-07  5.48e-07  2.29e-06  1.45e-06  3.20e-06   erg/cm2
      90%_error_low -3.69e-08 -4.16e-08 -7.65e-08 -1.44e-06 -1.91e-07 -1.42e-06   erg/cm2
      90%_error_hi   2.54e-08  4.24e-08  8.85e-08  9.33e-07  1.85e-07  9.25e-07   erg/cm2
Peak flux      CPL   7.72e-03  1.27e-01  4.06e-01  1.15e-01  6.46e-01  6.56e-01   ph/cm2/s
      90%_error_low -7.72e-03 -7.51e-02 -1.04e-01 -1.15e-01 -1.74e-01 -1.83e-01   ph/cm2/s
      90%_error_hi   6.03e-02  1.14e-01  1.04e-01  1.93e-01  2.06e-01  2.63e-01   ph/cm2/s
 
======================================================================

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
  144.4731    44.2622   0.0151    28.2521    82.6909         1.7513642     12.700 TRIG_00575754                 
 
Foreground time interval of the image:
 -8.280  49.909 (delta_t =  58.189 [sec])
Background time interval of the image:
-239.592  -8.280 (delta_t = 231.312 [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

Time interval is from   -8.280 sec. to  101.016 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.998425     ( -0.21367   0.221691 )
Norm@50keV  : 1.23326E-03    ( -0.000147436   0.000146264 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.08 using 59 PHA bins.
# Reduced chi-squared =          1.124 for     57 degrees of freedom 
# Null hypothesis probability =   2.421515e-01
 
Photon flux (15-150 keV)    in 109.3 sec: 0.141972 ( -0.017301  0.017409 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.45858e-06 ( -1.8199e-07  1.82997e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from   -8.280 sec. to  101.016 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.865113     ( -0.328748   1.02251 )
Epeak [keV] : 513.471      ( -515.436 -515.436 )
Norm@50keV  : 1.40260E-03    ( -0.000282275   0.00120944 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.01 using 59 PHA bins.
# Reduced chi-squared =          1.143 for     56 degrees of freedom 
# Null hypothesis probability =   2.159257e-01
 
Photon flux (15-150 keV)    in 109.3 sec: 0.140977 ( -0.018594  0.01717 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.45064e-06 ( -1.91077e-07  1.85498e-07 ) ergs/cm2

1-s peak spectrum fit

Power-law model

Time interval is from    1.036 sec. to    2.036 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.570049     ( -0.394375   0.444178 )
Norm@50keV  : 6.68617E-03    ( -0.0019029   0.00184873 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          73.27 using 59 PHA bins.
# Reduced chi-squared =          1.285 for     57 degrees of freedom 
# Null hypothesis probability =   7.213927e-02
 
Photon flux (15-150 keV)    in 1 sec: 0.783451 ( -0.198339  0.20204 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.67721e-08 ( -2.12738e-08  2.13464e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    1.036 sec. to    2.036 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 5.73035     ( -5.01646   -6.19823 )
Epeak [keV] : 85.2529      ( -12.1981 39.9639 )
Norm@50keV  : 0.779664    ( -0.752959   18.8495 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.04 using 59 PHA bins.
# Reduced chi-squared =          1.161 for     56 degrees of freedom 
# Null hypothesis probability =   1.908980e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.646072 ( -0.173968  0.205917 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.54779e-08 ( -2.15926e-08  2.36806e-08 ) ergs/cm2

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 96.816 sec.
Hardness ratio (energy fluence ratio) = 2.00221107256

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

S(15-50 keV)  = 3.776539e-07
S(50-150 keV) = 1.080924e-06

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 = 6.836518183555379E-02, IMY = -5.329999211614854E-01

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:
-239.592000 -8.280000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
196.6204  71.9814    2.7  46.1  139.1   3.2029   4.3 ------	UNKNOWN

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

Time interval of the image:
-8.280000 49.908590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
144.4731  44.2622    0.9  28.3   82.7   1.7514  12.7 ------	UNKNOWN                       
181.6487   1.7540    2.1  27.2  -69.7   0.5959   5.4 ------	UNKNOWN                       
151.2967 -20.5758    2.3  52.7  -24.8   1.3054   5.0 ------	UNKNOWN                       
149.3349 -22.0792    2.1  54.8  -23.6   1.6362   5.5 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
99.708580 720.508620
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
206.3526  76.0735    2.7  40.7  172.9   2.4521   4.2 ------	UNKNOWN                       
145.1234  31.7362    2.7  12.5  -28.8   1.4402   4.2 ------	UNKNOWN

Analysis Summary

Notes:

Image

Pre-slew 15.0-350.0 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