GRB100904A: 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 16:18:38 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger433273
======================================================================

  Trigger: 00433273      Segment: 000

  BAT Trigger Time: 305256829.952   [s; MET]
      Trigger Stop: 305256832   [s; MET]
               UTC: 2010-09-04T01:33:43.808300    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 172.918812328497   Dec: -16.208937006196  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.27
     Image Trigger?:     NO
     Rate S/N Ratio:     12.2474487139159  [ if not an image trigger ]
     Image S/N Ratio:    8.27

  Analysis Position:   [ source = BAT ]
    RA: 172.918812328497   Dec: -16.208937006196  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 172.900684905533   Dec: -16.1947214669732  [deg; J2000]  
        { 11h 31m 36.2s , -16d 11' 41.0" }
         +/- 1.54558234406053 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.614865258960703 [arcmin] (formal 1-sigma fit error)
    SNR: 16.3300208811769
 
  Angular difference between the analysis and refined position is 1.348469 arcmin
 
  Partial Coding Fraction: 0.3085938    [ including projection effects ]

  Duration
     T90: 31.2480000257492 +/- 5.96309181800968
        Measured from: -13.5920000076294
                   to: 17.6560000181198     [s; relative to TRIGTIME]
     T50: 11.5840000510216 +/- 3.78656147981967
        Measured from: -7.68800002336502
                   to: 3.89600002765656     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 2.29999995231628     
                   to: 3.29999995231628     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -14.5680000185966     
                   to: 23.5119999647141     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.653864   0.752655   0.548070   0.151163
           0.058201   0.061036   0.055959   0.052758 [error]
 Peak      0.052320   0.066565   0.064872   0.008278
           0.010281   0.010619   0.009614   0.008507 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   38.080  -14.568   23.512
T90    31.248  -13.592   17.656
T50    11.584   -7.688    3.896
Peak    1.000    2.300    3.300
 
 
====== 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      -1.672    -0.163      0.159       -           -               -         3.59e-03     -3.47e-04          3.42e-04      50.240   57
CPL     -1.570    -0.554      0.612      198.991    -198.991      -198.991      4.07e-03     -1.84e-03          4.38e-03      50.150   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      -1.562     -0.268     0.262       -           -               -         1.24e-02     -2.14e-03          2.12e-03      63.810   57
CPL     -0.330     -1.151     1.499       63.961     -15.702       172.449      5.58e-02     -5.58e-02          2.71e-01      60.440   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   2.05e-07  3.40e-07  4.27e-07  1.07e-06  1.27e-06  2.04e-06   erg/cm2
      90%_error_low -2.86e-08 -3.00e-08 -5.57e-08 -2.65e-07 -1.29e-07 -3.19e-07   erg/cm2
      90%_error_hi   2.95e-08  3.00e-08  5.57e-08  3.19e-07  1.31e-07  3.62e-07   erg/cm2
Peak flux       PL   5.41e-01  5.25e-01  3.56e-01  3.78e-01  1.57e+00  1.80e+00   ph/cm2/s
      90%_error_low -1.36e-01 -8.98e-02 -7.56e-02 -1.36e-01 -2.61e-01 -2.99e-01   ph/cm2/s
      90%_error_hi   1.44e-01  8.92e-02  7.52e-02  1.76e-01  2.62e-01  3.01e-01   ph/cm2/s
 
Fluence        CPL   2.03e-07  3.44e-07  4.28e-07  8.92e-07  1.26e-06  1.87e-06   erg/cm2
      90%_error_low -3.25e-08 -3.35e-08 -5.64e-08 -5.38e-07 -1.46e-07 -5.62e-07   erg/cm2
      90%_error_hi   2.52e-08  3.77e-08  5.76e-08  2.37e-07  1.40e-07  2.80e-07   erg/cm2
Peak flux      CPL   4.53e-01  5.99e-01  3.81e-01  1.14e-01  1.52e+00  1.55e+00   ph/cm2/s
      90%_error_low -1.61e-01 -1.14e-01 -9.08e-02 -1.14e-01 -2.66e-01 -2.82e-01   ph/cm2/s
      90%_error_hi   1.67e-01  1.20e-01  9.12e-02  2.35e-01  2.67e-01  3.16e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  172.9007   -16.1947   0.0117    35.2453  -111.9010         2.1748596     16.330 TRIG_00433273                 
 
Foreground time interval of the image:
-14.568  23.512 (delta_t =  38.080 [sec])
Background time interval of the image:
-188.651 -14.568 (delta_t = 174.083 [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  -14.568 sec. to   23.512 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.67186     ( -0.16274   0.159304 )
Norm@50keV  : 3.59404E-03    ( -0.000346927   0.000342235 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.24 using 59 PHA bins.
# Reduced chi-squared =         0.8815 for     57 degrees of freedom 
# Null hypothesis probability =   7.245965e-01
 
Photon flux (15-150 keV)    in 38.08 sec: 0.472752 ( -0.041782  0.041827 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.27039e-06 ( -1.29414e-07  1.31186e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from  -14.568 sec. to   23.512 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.5703     ( -0.553699   0.611952 )
Epeak [keV] : 198.991      ( -198.991 -198.991 )
Norm@50keV  : 4.07149E-03    ( -0.00183839   0.00437724 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.15 using 59 PHA bins.
# Reduced chi-squared =         0.8955 for     56 degrees of freedom 
# Null hypothesis probability =   6.949417e-01
 
Photon flux (15-150 keV)    in 38.08 sec: 0.470574 ( -0.043437  0.043184 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.25828e-06 ( -1.45529e-07  1.40205e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    2.300 sec. to    3.300 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.56171     ( -0.267852   0.262387 )
Norm@50keV  : 1.23949E-02    ( -0.00213704   0.00211531 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          63.81 using 59 PHA bins.
# Reduced chi-squared =          1.119 for     57 degrees of freedom 
# Null hypothesis probability =   2.496117e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.57455 ( -0.26121  0.26159 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.16509e-07 ( -2.13741e-08  2.17012e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    2.300 sec. to    3.300 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.330212     ( -1.15073   1.49868 )
Epeak [keV] : 63.9613      ( -15.7017 172.449 )
Norm@50keV  : 5.57774E-02    ( -0.0557776   0.270767 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.44 using 59 PHA bins.
# Reduced chi-squared =          1.079 for     56 degrees of freedom 
# Null hypothesis probability =   3.187232e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.51897 ( -0.2662  0.26682 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.06974e-07 ( -2.19366e-08  2.32287e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 31.248 sec.
Hardness ratio (energy fluence ratio) = 1.25542229365

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

S(15-50 keV)  = 5.452543e-07
S(50-150 keV) = 7.251214e-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 = -2.635671270039845E-01, IMY = 6.556116806304019E-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:
-188.651400 -14.568000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
170.4548 -60.6792   20.9  57.4 -167.7  -0.4647  -0.5    5.3	Cen X-3                       
186.7765 -62.7896    4.5  54.5 -176.7   1.5416   2.6    3.5	GX 301-2                      
244.9790 -15.6200    0.5  35.6   93.3  10.8501  23.9    1.2	Sco X-1                       
192.2576 -62.4504    2.4  53.2 -179.4   2.5339   4.8 ------	UNKNOWN                       
161.7432 -27.9778    2.9  47.3 -127.3   2.9600   4.0 ------	UNKNOWN                       

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

Time interval of the image:
-14.568000 23.512000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
170.2973 -60.6856   28.6  57.5 -167.6   0.1386   0.4    3.8	Cen X-3                       
186.6481 -62.9194    5.7  54.7 -176.7   0.5277   2.0    8.9	GX 301-2                      
244.8550 -15.7614    6.1  35.5   93.5   0.3314   1.9   10.2	Sco X-1                       
213.5545 -64.9533    2.3  54.5  168.7   1.7563   5.1 ------	UNKNOWN                       
172.9007 -16.1947    0.7  35.2 -111.9   2.1749  16.3 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
-618.952000 -498.898700
-338.952000 962.148000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
170.0961 -60.6543   20.5  57.5 -167.5   2.4805   0.6    6.7	Cen X-3                       
186.6295 -62.7628    5.5  54.5 -176.6   6.6878   2.1    0.9	GX 301-2                      
244.9835 -15.6348    0.4  35.6   93.3  69.4652  30.3    0.4	Sco X-1                       
206.4465 -62.8419    2.6  52.3  172.5  12.7672   4.5 ------	UNKNOWN                       
218.1911  27.4062    2.4  39.1    4.6   5.5193   4.9 ------	UNKNOWN                       
190.5431 -60.1000    2.9  51.3 -177.3   9.2040   4.0 ------	UNKNOWN                       
199.7573  46.5714    2.5  57.7  -16.1  16.7886   4.6 ------	UNKNOWN                       
190.7706  33.1751    2.6  47.0  -29.4   6.5140   4.4 ------	UNKNOWN                       
174.8972  22.8084    5.6  47.0  -53.3   9.6880   2.1 ------	UNKNOWN