Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Mon Jan 20 00:19:48 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger316910
======================================================================

  Trigger: 00316910      Segment: 000

  BAT Trigger Time: 237750779.584   [s; MET]
      Trigger Stop: 237750780.608   [s; MET]
               UTC: 2008-07-14T17:52:56.643300    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 188.109331293591   Dec: -60.2785024938338  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    17.38
     Image Trigger?:     NO
     Rate S/N Ratio:     51.7783738639985  [ if not an image trigger ]
     Image S/N Ratio:    17.38

  Analysis Position:   [ source = BAT ]
    RA: 188.109331293591   Dec: -60.2785024938338  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 188.101375281327   Dec: -60.2747529368591  [deg; J2000]  
        { 12h 32m 24.3s , -60d 16' 29.1" }
         +/- 0.861461306246883 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.257156541387293 [arcmin] (formal 1-sigma fit error)
    SNR: 37.6390541267428
 
  Angular difference between the analysis and refined position is 0.326544 arcmin
 
  Partial Coding Fraction: 0.4335938    [ including projection effects ]

  Duration
     T90: 25.8120000064373 +/- 5.11699909044548
        Measured from: -2.53999999165535
                   to: 23.272000014782     [s; relative to TRIGTIME]
     T50: 9.32400000095367 +/- 1.05152078842441
        Measured from: 0.0360000133514404
                   to: 9.36000001430511     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.343999981880188     
                   to: 0.656000018119812     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -3.81199997663498     
                   to: 32.2120000123978     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.008821   1.405352   1.197496   0.282227
           0.050018   0.052532   0.046722   0.039284 [error]
 Peak      0.109304   0.170171   0.179631   0.072866
           0.010167   0.011300   0.011174   0.008626 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   36.024   -3.812   32.212
T90    25.812   -2.540   23.272
T50     9.324    0.036    9.360
Peak    1.000   -0.344    0.656
 
 
====== 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      -1.440    -0.077      0.077       -           -               -         7.38e-03     -3.06e-04          3.06e-04      57.950   57
CPL     -1.266    -0.211      0.314      229.158    -229.158      -229.158      8.90e-03     -1.73e-03          3.45e-03      56.960   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      -1.109     -0.115     0.116       -           -               -         3.60e-02     -2.36e-03          2.36e-03      54.710   57
CPL     -1.038     -0.176     0.381      768.251    -768.251      -768.251      3.88e-02     -4.97e-03          1.80e-02      54.750   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   3.21e-07  6.12e-07  9.02e-07  2.85e-06  2.55e-06  4.69e-06   erg/cm2
      90%_error_low -2.54e-08 -2.87e-08 -4.70e-08 -3.22e-07 -1.14e-07 -3.53e-07   erg/cm2
      90%_error_hi   2.61e-08  2.85e-08  4.68e-08  3.50e-07  1.15e-07  3.75e-07   erg/cm2
Peak flux       PL   1.02e+00  1.30e+00  1.20e+00  1.96e+00  4.18e+00  5.48e+00   ph/cm2/s
      90%_error_low -1.32e-01 -1.04e-01 -8.88e-02 -2.95e-01 -2.82e-01 -3.84e-01   ph/cm2/s
      90%_error_hi   1.38e-01  1.03e-01  8.81e-02  3.27e-01  2.82e-01  3.89e-01   ph/cm2/s
 
Fluence        CPL   3.08e-07  6.19e-07  9.15e-07  2.24e-06  2.52e-06  4.08e-06   erg/cm2
      90%_error_low -3.23e-08 -3.14e-08 -5.21e-08 -7.31e-07 -1.25e-07 -7.36e-07   erg/cm2
      90%_error_hi   3.29e-08  3.18e-08  5.27e-08  8.60e-07  1.25e-07  7.36e-07   erg/cm2
Peak flux      CPL   1.02e+00  1.30e+00  1.21e+00  1.91e+00  4.18e+00  5.46e+00   ph/cm2/s
      90%_error_low -1.67e-01 -9.89e-02 -9.08e-02 -6.80e-01 -2.81e-01 -7.69e-01   ph/cm2/s
      90%_error_hi   1.13e-01  1.11e-01  1.08e-01  2.93e-01  2.85e-01  3.77e-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
      188.1014   -60.2748   0.0051    31.6241   -66.3882         3.4022921     37.639 TRIG_00316910                 
     
    Foreground time interval of the image:
     -3.812  14.117 (delta_t =  17.929 [sec])
    Background time interval of the image:
    -239.584  -3.812 (delta_t = 235.772 [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   -3.812 sec. to   32.212 sec.
     
    Spectral model in power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: -1.43978     ( -0.077068   0.0769673 )
    Norm@50keV  : 7.37970E-03    ( -0.00030614   0.00030601 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          57.95 using 59 PHA bins.
    # Reduced chi-squared =          1.017 for     57 degrees of freedom 
    # Null hypothesis probability =   4.398941e-01
     
    Photon flux (15-150 keV)    in 36.02 sec: 0.907182 ( -0.040044  0.040146 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 2.54885e-06 ( -1.14381e-07  1.1472e-07 ) ergs/cm2
     
    
    Cutoff power-law model
    Time interval is from   -3.812 sec. to   32.212 sec.
    Spectral model in the cutoff power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: -1.26608     ( -0.210551   0.313525 )
    Epeak [keV] : 229.158      ( -229.154 -229.154 )
    Norm@50keV  : 8.89500E-03    ( -0.00173378   0.00345242 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          56.96 using 59 PHA bins.
    # Reduced chi-squared =          1.017 for     56 degrees of freedom 
    # Null hypothesis probability =   4.392302e-01
     
    Photon flux (15-150 keV)    in 36.02 sec: 0.897223 ( -0.043226  0.043369 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 2.51984e-06 ( -1.25185e-07  1.24596e-07 ) ergs/cm2
     
    

    1-s peak spectrum fit

    Power-law model
    Time interval is from   -0.344 sec. to    0.656 sec.
     
    Spectral model in power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: -1.10877     ( -0.114584   0.115813 )
    Norm@50keV  : 3.60351E-02    ( -0.00236084   0.00235861 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          54.71 using 59 PHA bins.
    # Reduced chi-squared =         0.9599 for     57 degrees of freedom 
    # Null hypothesis probability =   5.613719e-01
     
    Photon flux (15-150 keV)    in 1 sec: 4.18345 ( -0.28196  0.28242 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 3.75751e-07 ( -2.70365e-08  2.71423e-08 ) ergs/cm2
     
    
    Cutoff power-law model
    Time interval is from   -0.344 sec. to    0.656 sec.
    Spectral model in the cutoff power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: -1.10367     ( -0.17132   0.385218 )
    Epeak [keV] : 9998.30      ( -9998.24 -9998.24 )
    Norm@50keV  : 3.62301E-02    ( -0.00236366   0.0205756 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          54.71 using 59 PHA bins.
    # Reduced chi-squared =         0.9770 for     56 degrees of freedom 
    # Null hypothesis probability =   5.238146e-01
     
    Photon flux (15-150 keV)    in 1 sec: 4.18062 ( -0.28135  0.28493 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 3.75708e-07 ( -2.82439e-08  2.61938e-08 ) ergs/cm2
     
    

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot

    T90                                   = 25.812 sec.
    Hardness ratio (energy fluence ratio) = 1.47451768303
    

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

    S(15-50 keV)  = 9.323942e-07
    S(50-150 keV) = 1.6164411e-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 = 2.466448305824361E-01, IMY = 5.642309913040295E-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:
    -239.584000 -3.812000
     
    # RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
    #  [deg]    [deg]    ['] [deg]  [deg]                   [']
    170.6652 -60.6207    7.8  38.3  -75.8   1.0260   1.5   10.3	Cen X-3                       
    186.5602 -62.6352  250.2  31.0  -71.0   0.0148   0.0    8.5	GX 301-2                      
    244.9894 -15.6342    0.6  46.8   36.9  18.8057  20.1    0.7	Sco X-1                       
    256.0042 -37.8490    1.2  23.9   51.2   2.3772   9.6    0.9	4U 1700-377                   
    256.5692 -36.5144    3.0  25.2   52.3   1.0239   3.9    8.5	GX 349+2                      
    263.1645 -24.7723    7.8  37.3   62.2   0.8661   1.5    8.6	GX 1+4                        
    264.6318 -44.5598    5.3  17.8   71.4   0.4978   2.2    8.1	4U 1735-44                    
    270.2039 -24.9667    5.9  37.9   72.6   1.3880   2.0    8.0	GX 5-1                        
    270.4564 -25.7089    7.5  37.3   73.2   1.0007   1.5    8.6	GRS 1758-258                  
    275.9870 -30.5503    0.0  33.7   83.3  -0.6321  -1.3   11.5	H1820-303                     
    262.8904 -33.8327    7.6  28.2   63.4   0.4626   1.5    4.9	GX 354-0                      
    218.8338 -31.1167    2.6  39.1   -3.9   1.2582   4.4 ------	UNKNOWN                       
    220.3217 -34.0824    3.2  35.9   -4.4   0.9614   3.7 ------	UNKNOWN                       
    194.1372 -36.3794    3.9  45.6  -34.0   1.3168   2.9 ------	UNKNOWN                       
    182.5579 -36.8263    4.0  50.7  -44.5   3.6856   2.9 ------	UNKNOWN                       
    

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

    Time interval of the image:
    -3.812000 14.116590
     
    # RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
    #  [deg]    [deg]    ['] [deg]  [deg]                   [']
    170.0042 -60.5917   31.3  38.6  -76.1  -0.0612  -0.4    9.4	Cen X-3                       
    186.2684 -62.8696    6.0  31.0  -71.5   0.1743   1.9   12.2	GX 301-2                      
    245.2132 -15.6486    0.0  46.8   37.1  -0.0282  -0.2   13.5	Sco X-1                       
    256.1660 -37.8977  258.8  23.9   51.5  -0.0028  -0.0    9.1	4U 1700-377                   
    256.6571 -36.3715   18.9  25.4   52.4   0.0408   0.6   11.1	GX 349+2                      
    262.9182 -24.6460    6.1  37.4   61.8  -0.2500  -1.9    7.8	GX 1+4                        
    264.8422 -44.6073   28.5  17.8   71.9   0.0226   0.4   10.3	4U 1735-44                    
    270.4395 -25.0834    8.3  37.9   73.0   0.2154   1.4    8.4	GX 5-1                        
    270.4198 -25.7124   13.6  37.2   73.1  -0.1213  -0.8    6.6	GRS 1758-258                  
    275.8234 -30.2590    6.6  33.9   82.9  -0.1903  -1.8    8.3	H1820-303                     
    262.9256 -33.9049   11.4  28.2   63.5  -0.0725  -1.0    5.3	GX 354-0                      
    291.4856 -77.0582    2.8  19.0 -151.1   0.2094   4.1 ------	UNKNOWN                       
    188.1013 -60.2747    0.3  31.6  -66.4   3.4025  37.3 ------	UNKNOWN                       
     62.9163 -67.9480    2.5  49.9 -134.5   1.2040   4.5 ------	UNKNOWN                       
    

    Post-slew image of 15-350 keV band

    Time interval of the image:
    68.916590 819.616600
     
    # RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
    #  [deg]    [deg]    ['] [deg]  [deg]                   [']
    135.7384 -40.6398    0.0  37.3 -106.9   1.3190   1.0   10.8	Vela X-1                      
    170.4711 -60.5334    2.9   8.7 -123.7   1.5978   4.0    7.1	Cen X-3                       
    186.5749 -62.7416    2.3   2.6  172.1   2.3227   5.0    2.8	GX 301-2                      
    201.4236 -43.0080    1.2  19.0    6.5   3.7776   9.3 ------	UNKNOWN                       
    152.4309 -58.3121    1.3  18.1 -123.9   4.0670   8.8 ------	UNKNOWN