GRB100615A: Summary Image Light curves Spectra Distribution Others

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: Fri Jan 17 18:04:45 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger424733
======================================================================

  Trigger: 00424733      Segment: 000

  BAT Trigger Time: 298259949.888   [s; MET]
      Trigger Stop: 298259950.4   [s; MET]
               UTC: 2010-06-15T01:59:03.994640    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 177.207328867743   Dec: -19.4961246717107  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    10.47
     Image Trigger?:     NO
     Rate S/N Ratio:     24.8797106092495  [ if not an image trigger ]
     Image S/N Ratio:    10.47

  Analysis Position:   [ source = BAT ]
    RA: 177.207328867743   Dec: -19.4961246717107  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 177.206896696251   Dec: -19.4818276375009  [deg; J2000]  
        { 11h 48m 49.7s , -19d 28' 54.6" }
         +/- 0.53475308005613 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.236200789362413 [arcmin] (formal 1-sigma fit error)
    SNR: 74.3825077442666
 
  Angular difference between the analysis and refined position is 0.858170 arcmin
 
  Partial Coding Fraction: 0.9921875    [ including projection effects ]

  Duration
     T90: 38.8199999332428 +/- 0.816637012866886
        Measured from: 1.2960000038147
                   to: 40.1159999370575     [s; relative to TRIGTIME]
     T50: 23.4359999299049 +/- 1.45443869005261
        Measured from: 7.26399999856949
                   to: 30.6999999284744     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 10.255999982357     
                   to: 11.255999982357     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.0440000295639038     
                   to: 47.4079999923706     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     3.166523   3.425759   2.063432   0.396882
           0.044460   0.045767   0.039516   0.032415 [error]
 Peak      0.192803   0.265776   0.181494   0.038326
           0.008133   0.009009   0.007812   0.005528 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   47.452   -0.044   47.408
T90    38.820    1.296   40.116
T50    23.436    7.264   30.700
Peak    1.000   10.256   11.256
 
 
====== 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      -1.864    -0.044      0.043       -           -               -         1.13e-02     -2.39e-04          2.39e-04      51.900   57
CPL     -1.646    -0.172      0.179       85.491     -17.274       107.912      1.42e-02     -2.34e-03          2.94e-03      47.160   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      -1.620     -0.075     0.075       -           -               -         4.30e-02     -1.83e-03          1.82e-03      49.470   57
CPL     -1.278     -0.287     0.307      104.526     -28.303       237.230      6.40e-02     -1.78e-02          2.69e-02      45.270   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   9.62e-07  1.42e-06  1.56e-06  3.21e-06  4.92e-06  7.15e-06   erg/cm2
      90%_error_low -4.07e-08 -3.35e-08 -4.42e-08 -2.06e-07 -1.05e-07 -2.29e-07   erg/cm2
      90%_error_hi   4.15e-08  3.34e-08  4.41e-08  2.15e-07  1.05e-07  2.36e-07   erg/cm2
Peak flux       PL   1.98e+00  1.86e+00  1.21e+00  1.22e+00  5.56e+00  6.27e+00   ph/cm2/s
      90%_error_low -1.43e-01 -8.19e-02 -6.58e-02 -1.32e-01 -2.37e-01 -2.57e-01   ph/cm2/s
      90%_error_hi   1.46e-01  8.16e-02  6.56e-02  1.41e-01  2.37e-01  2.57e-01   ph/cm2/s
 
Fluence        CPL   9.12e-07  1.43e-06  1.57e-06  2.40e-06  4.82e-06  6.32e-06   erg/cm2
      90%_error_low -5.45e-08 -3.55e-08 -4.67e-08 -4.72e-07 -1.27e-07 -4.99e-07   erg/cm2
      90%_error_hi   5.56e-08  3.56e-08  4.70e-08  6.16e-07  1.27e-07  6.36e-07   erg/cm2
Peak flux      CPL   1.86e+00  1.91e+00  1.24e+00  8.20e-01  5.45e+00  5.84e+00   ph/cm2/s
      90%_error_low -1.72e-01 -9.41e-02 -7.13e-02 -2.25e-01 -2.52e-01 -3.53e-01   ph/cm2/s
      90%_error_hi   1.75e-01  9.53e-02  7.21e-02  3.24e-01  2.52e-01  4.11e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  177.2069   -19.4818   0.0026    18.0276   -25.8857         3.9263866     74.383 TRIG_00424733                 
 
Foreground time interval of the image:
 -0.044  11.613 (delta_t =  11.657 [sec])
Background time interval of the image:
-239.888  -0.044 (delta_t = 239.844 [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

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   -0.044 sec. to   47.408 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.86399     ( -0.04362   0.0434578 )
Norm@50keV  : 1.12668E-02    ( -0.000239243   0.000239071 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.90 using 59 PHA bins.
# Reduced chi-squared =         0.9104 for     57 degrees of freedom 
# Null hypothesis probability =   6.664824e-01
 
Photon flux (15-150 keV)    in 47.45 sec: 1.59284 ( -0.03997  0.04022 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.91573e-06 ( -1.04605e-07  1.04651e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -0.044 sec. to   47.408 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.64578     ( -0.171862   0.178634 )
Epeak [keV] : 85.4912      ( -17.2735 107.912 )
Norm@50keV  : 1.42467E-02    ( -0.00234426   0.00293639 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          47.16 using 59 PHA bins.
# Reduced chi-squared =         0.8422 for     56 degrees of freedom 
# Null hypothesis probability =   7.937292e-01
 
Photon flux (15-150 keV)    in 47.45 sec: 1.55722 ( -0.04784  0.04825 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.82144e-06 ( -1.27192e-07  1.26974e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   10.256 sec. to   11.256 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.61987     ( -0.0750725   0.0745779 )
Norm@50keV  : 4.29716E-02    ( -0.00182987   0.0018246 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.47 using 59 PHA bins.
# Reduced chi-squared =         0.8680 for     57 degrees of freedom 
# Null hypothesis probability =   7.502803e-01
 
Photon flux (15-150 keV)    in 1 sec: 5.55678 ( -0.23679  0.23714 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.00996e-07 ( -1.82241e-08  1.8309e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   10.256 sec. to   11.256 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.27839     ( -0.28672   0.3072 )
Epeak [keV] : 104.526      ( -28.3031 237.23 )
Norm@50keV  : 6.40011E-02    ( -0.017765   0.0268608 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          45.27 using 59 PHA bins.
# Reduced chi-squared =         0.8084 for     56 degrees of freedom 
# Null hypothesis probability =   8.467739e-01
 
Photon flux (15-150 keV)    in 1 sec: 5.45174 ( -0.25176  0.25192 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.8978e-07 ( -2.05984e-08  2.05375e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 38.82 sec.
Hardness ratio (energy fluence ratio) = 1.09890441151

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

S(15-50 keV)  = 2.3782578e-06
S(50-150 keV) = 2.5375005e-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 = 2.927979197598233E-01, IMY = 1.420848382767138E-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:
-239.888000 -0.044000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5211 -40.5697    0.5  32.2 -134.5   6.2648  24.1    1.0	Vela X-1                      
170.3632 -60.6399    3.8  23.5  162.6   0.6811   3.1    1.7	Cen X-3                       
186.6809 -62.7576    3.3  25.9  144.2   0.8914   3.5    1.0	GX 301-2                      
169.1448 -21.5940    2.3  17.4  -51.8   1.0285   5.0 ------	UNKNOWN                       
110.4408 -50.7319    2.3  48.0 -154.3   2.3589   5.1 ------	UNKNOWN                       
 92.2575 -51.4209    3.4  58.7 -159.2   5.4131   3.4 ------	UNKNOWN                       

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

Time interval of the image:
-0.044000 11.612600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.3776 -40.5460    7.1  32.3 -134.5  -0.1116  -1.6    6.9	Vela X-1                      
170.6896 -60.5919    7.0  23.4  162.2   0.1008   1.6   11.2	Cen X-3                       
186.9211 -62.8465    6.5  26.0  144.1  -0.1273  -1.8    8.6	GX 301-2                      
207.7414 -29.2260    2.5  26.7   55.1   0.3418   4.7 ------	UNKNOWN                       
200.7993  -8.8891    2.1  35.7   16.8   0.4241   5.4 ------	UNKNOWN                       
201.1185   7.4426    2.9  50.2    5.7   0.6128   4.0 ------	UNKNOWN                       
177.2069 -19.4818    0.2  18.0  -25.9   3.9258  74.4 ------	UNKNOWN                       
123.3588 -29.1971    2.8  45.1 -121.8   1.0397   4.1 ------	UNKNOWN                       
121.5960 -30.3791    2.1  46.0 -124.2   1.4389   5.3 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
51.612600 962.187700
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5098 -40.5384    0.7  41.3 -150.8  18.0193  16.8    1.3	Vela X-1                      
170.1088 -60.5676    5.2  41.4  164.4   2.8116   2.2    6.9	Cen X-3                       
186.5878 -62.7141    3.5  43.7  152.9   5.2523   3.3    3.9	GX 301-2                      
137.1359 -67.2613    4.3  54.1  177.0   6.7675   2.7 ------	UNKNOWN                       
194.3647  26.8872    2.9  49.3   -0.5   5.6775   4.0 ------	UNKNOWN                       
175.2672  23.6544    3.4  43.2  -23.5   3.3323   3.4 ------	UNKNOWN                       
150.4422  -7.9279    3.5  28.4  -90.6   3.1882   3.3 ------	UNKNOWN                       
113.1515 -50.7988    3.4  58.7 -159.2  17.7953   3.4 ------	UNKNOWN