Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Mon Jan 20 09:13:16 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger282003
======================================================================

  Trigger: 00282003      Segment: 000

  BAT Trigger Time: 203219835.904   [s; MET]
      Trigger Stop: 203219840   [s; MET]
               UTC: 2007-06-11T01:57:13.890180    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 1.9868655908934   Dec: -29.7554040882877  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    9.07
     Image Trigger?:     NO
     Rate S/N Ratio:     10.8627804912002  [ if not an image trigger ]
     Image S/N Ratio:    9.07

  Analysis Position:   [ source = BAT ]
    RA: 1.9868655908934   Dec: -29.7554040882877  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 2.00091191922861   Dec: -29.7572766138615  [deg; J2000]  
        { 00h 08m 00.2s , -29d 45' 26.2" }
         +/- 2.01427871160528 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.793604522444606 [arcmin] (formal 1-sigma fit error)
    SNR: 11.1856663703424
 
  Angular difference between the analysis and refined position is 0.740230 arcmin
 
  Partial Coding Fraction: 0.5078125    [ including projection effects ]

  Duration
     T90: 13.1839999854565 +/- 3.47093071439187
        Measured from: -6.56000000238419
                   to: 6.62399998307228     [s; relative to TRIGTIME]
     T50: 5.56800001859665 +/- 2.26455118204277
        Measured from: -1.95200002193451
                   to: 3.61599999666214     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 2.76399999856949     
                   to: 3.76399999856949     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -8.41600000858307     
                   to: 7.58399999141693     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.179663   0.257959   0.150218   0.056272
           0.029258   0.030578   0.027401   0.024342 [error]
 Peak      0.019320   0.046974   0.014280   0.006305
           0.007677   0.007842   0.006862   0.006057 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   16.000   -8.416    7.584
T90    13.184   -6.560    6.624
T50     5.568   -1.952    3.616
Peak    1.000    2.764    3.764
 
 
====== 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      -1.664    -0.242      0.235       -           -               -         2.71e-03     -4.02e-04          3.96e-04      56.220   57
CPL     -0.746    -1.024      1.666       62.859     -12.902       -62.859      8.45e-03     -8.45e-03          5.76e-02      54.610   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      -1.760     -0.418     0.388       -           -               -         5.90e-03     -1.62e-03          1.59e-03      50.050   57
CPL      1.995      1.316    -1.995       47.391      -6.011         2.703      5.74e-01     -5.74e-01          2.11e+04      41.830   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   6.46e-08  1.07e-07  1.35e-07  3.41e-07  4.03e-07  6.49e-07   erg/cm2
      90%_error_low -1.38e-08 -1.51e-08 -2.62e-08 -1.19e-07 -6.24e-08 -1.46e-07   erg/cm2
      90%_error_hi   1.45e-08  1.51e-08  2.61e-08  1.54e-07  6.32e-08  1.73e-07   erg/cm2
Peak flux       PL   3.12e-01  2.69e-01  1.59e-01  1.41e-01  8.00e-01  8.80e-01   ph/cm2/s
      90%_error_low -1.10e-01 -6.87e-02 -5.32e-02 -7.34e-02 -2.03e-01 -2.21e-01   ph/cm2/s
      90%_error_hi   1.21e-01  6.85e-02  5.36e-02  1.07e-01  2.04e-01  2.22e-01   ph/cm2/s
 
Fluence        CPL   5.75e-08  1.19e-07  1.38e-07  9.59e-08  3.72e-07  4.10e-07   erg/cm2
      90%_error_low -1.74e-08 -2.15e-08 -3.18e-08 -7.61e-08 -7.27e-08 -1.06e-07   erg/cm2
      90%_error_hi   1.73e-08  2.29e-08  2.98e-08  2.86e-07  7.52e-08  3.00e-07   erg/cm2
Peak flux      CPL   4.65e-02  4.06e-01  1.31e-01  1.63e-04  5.89e-01  5.88e-01   ph/cm2/s
      90%_error_low -1.42e-02 -1.06e-01 -4.62e-02 -5.22e-05 -1.29e-01 -1.29e-01   ph/cm2/s
      90%_error_hi   1.16e-01  1.07e-01  7.77e-02  5.19e-03  1.79e-01  1.80e-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
    2.0009   -29.7573   0.0171    42.9779  -167.2617         0.6837771     11.186 TRIG_00282003                 
 
Foreground time interval of the image:
 -8.416   7.584 (delta_t =  16.000 [sec])
Background time interval of the image:
-239.904  -8.416 (delta_t = 231.488 [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:




    Spectra

    Notes:

    Time averaged spectrum fit using the average DRM

    Power-law model
    Time interval is from   -8.416 sec. to    7.584 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.66446     ( -0.241775   0.23453 )
Norm@50keV  : 2.70911E-03    ( -0.000401658   0.00039614 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.22 using 59 PHA bins.
# Reduced chi-squared =         0.9864 for     57 degrees of freedom 
# Null hypothesis probability =   5.042203e-01
 
Photon flux (15-150 keV)    in 16 sec: 0.355463 ( -0.049987  0.050074 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.02624e-07 ( -6.2396e-08  6.32194e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -8.416 sec. to    7.584 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.74618     ( -1.02468   1.66509 )
Epeak [keV] : 62.8594      ( -12.8728 -62.8297 )
Norm@50keV  : 8.45129E-03    ( -0.00846776   0.0576081 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.61 using 59 PHA bins.
# Reduced chi-squared =         0.9752 for     56 degrees of freedom 
# Null hypothesis probability =   5.276112e-01
 
Photon flux (15-150 keV)    in 16 sec: 0.342944 ( -0.053869  0.053131 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.724e-07 ( -7.26701e-08  7.52411e-08 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from    2.764 sec. to    3.764 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.7601     ( -0.418114   0.388396 )
Norm@50keV  : 5.89746E-03    ( -0.00161797   0.00158543 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.05 using 59 PHA bins.
# Reduced chi-squared =         0.8781 for     57 degrees of freedom 
# Null hypothesis probability =   7.311864e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.800491 ( -0.203325  0.203969 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.43914e-08 ( -1.49747e-08  1.53531e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from    2.764 sec. to    3.764 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 9.97221     ( -6.67173   -9.98282 )
Epeak [keV] : 45.6132      ( -4.23274 4.48143 )
Norm@50keV  : 6367.50    ( -6555.17   14576.8 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          37.34 using 59 PHA bins.
# Reduced chi-squared =         0.6667 for     56 degrees of freedom 
# Null hypothesis probability =   9.740890e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.588933 ( -0.129364  0.17911 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.88508e-08 ( -8.20366e-09  1.07867e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 13.184 sec.
Hardness ratio (energy fluence ratio) = 1.26188600241

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

    S(15-50 keV)  = 1.7197233e-07
S(50-150 keV) = 2.3064864e-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 = -9.088612587177003E-01, IMY = 2.054589843588912E-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:
-239.904000 -8.416000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
170.0742 -60.5499   12.8  46.2   13.3   0.3043   0.9    8.4	Cen X-3                       
186.6272 -62.7515    3.8  45.0   24.6   1.1556   3.0    1.4	GX 301-2                      
  1.1209 -13.6410    2.9  59.1 -166.2   4.2603   4.0 ------	UNKNOWN

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

    Time interval of the image:
-8.416000 7.584000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
170.5577 -60.6914    3.8  46.1   13.7   0.2522   3.0    8.2	Cen X-3                       
186.7375 -62.7900    8.7  45.0   24.7   0.1170   1.3    2.5	GX 301-2                      
 54.3333 -68.0926    2.2  13.4  -57.5   0.1754   5.3 ------	UNKNOWN                       
  2.0009 -29.7573    1.0  43.0 -167.3   0.6838  11.2 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
171.796590 962.147500
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5674 -40.5409    2.4  41.7  -54.8   6.7109   4.8    2.0	Vela X-1                      
170.2089 -60.7357    8.5  13.2  -38.3   0.5429   1.4    7.5	Cen X-3                       
186.6616 -62.7639    0.3   7.2   -6.1  13.7925  33.9    0.4	GX 301-2                      
299.5212 -53.1672    2.1  46.1  149.8   6.1484   5.4 ------	UNKNOWN                       
231.5846 -72.2980    2.9  12.4  144.2   1.5677   3.9 ------	UNKNOWN                       
177.4232 -49.3341    3.5  21.6   -7.9   1.3539   3.3 ------	UNKNOWN                       
  1.4679 -51.2779    4.5  59.1 -166.2   7.7752   2.6 ------	UNKNOWN                       
131.1149 -61.9045    3.9  25.8  -81.9   1.6940   3.0 ------	UNKNOWN                       
 98.9291 -55.7147    4.8  41.1  -98.2   6.7751   2.5 ------	UNKNOWN