Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Wed Jan 22 19:54:41 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger158855
======================================================================

  Trigger: 00158855      Segment: 000

  BAT Trigger Time: 150482001.088   [s; MET]
      Trigger Stop: 150482002.112   [s; MET]
               UTC: 2005-10-08T16:33:21.316200    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 202.870241770763   Dec: 42.0905012677457  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    9.65
     Image Trigger?:     NO
     Rate S/N Ratio:     17.1464281994822  [ if not an image trigger ]
     Image S/N Ratio:    9.65

  Analysis Position:   [ source = BAT ]
    RA: 202.870241770763   Dec: 42.0905012677457  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 202.865621510716   Dec: 42.0997094923151  [deg; J2000]  
        { 13h 31m 27.7s , +42d 05' 59.0" }
         +/- 0.722108342293613 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.212847548333887 [arcmin] (formal 1-sigma fit error)
    SNR: 48.4300597979343
 
  Angular difference between the analysis and refined position is 0.589545 arcmin
 
  Partial Coding Fraction: 0.375    [ including projection effects ]

  Duration
     T90: 12.4079999923706 +/- 1.35531546723488
        Measured from: -1.52399998903275
                   to: 10.8840000033379     [s; relative to TRIGTIME]
     T50: 4.75599998235703 +/- 0.395251826248921
        Measured from: 2.27200001478195
                   to: 7.02799999713898     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 2.87999999523163     
                   to: 3.87999999523163     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -24.9320000112057     
                   to: 13.3319999873638     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.144757   2.185086   2.502211   0.886195
           0.062574   0.059771   0.055731   0.046049 [error]
 Peak      0.119897   0.201092   0.245730   0.091403
           0.011762   0.012560   0.012948   0.010832 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   38.264  -24.932   13.332
T90    12.408   -1.524   10.884
T50     4.756    2.272    7.028
Peak    1.000    2.880    3.880
 
 
====== 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: CPL)
 
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      -1.117    -0.051      0.051       -           -               -         1.29e-02     -3.78e-04          3.77e-04      61.450   57
CPL     -0.749    -0.210      0.220      212.094     -55.759       184.770      1.82e-02     -3.14e-03          3.97e-03      52.170   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      -1.045     -0.107     0.108       -           -               -         4.73e-02     -2.88e-03          2.87e-03      60.490   57
CPL     -0.850     -0.244     0.423      358.860    -358.860      -358.860      5.71e-02     -1.20e-02          2.75e-02      59.770   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   4.42e-07  1.03e-06  1.89e-06  8.36e-06  5.14e-06  1.17e-05   erg/cm2
      90%_error_low -2.76e-08 -3.86e-08 -5.57e-08 -5.67e-07 -1.46e-07 -5.85e-07   erg/cm2
      90%_error_hi   2.84e-08  3.85e-08  5.56e-08  5.96e-07  1.46e-07  6.09e-07   erg/cm2
Peak flux       PL   3.15e-04  3.85e-03  4.28e-02  4.24e+00  1.92e-01  4.27e+00   ph/cm2/s
      90%_error_low 1.28e-05 2.09e-04 3.13e-03 -2.43e-01 1.66e-02 -2.25e-01   ph/cm2/s
      90%_error_hi   1.01e-04  1.21e-03  1.34e-02  4.56e-01  5.88e-02  4.94e-01   ph/cm2/s
 
Fluence        CPL   3.93e-07  1.03e-06  1.97e-06  5.62e-06  5.08e-06  9.03e-06   erg/cm2
      90%_error_low -3.70e-08 -4.03e-08 -7.17e-08 -1.07e-06 -1.51e-07 -1.07e-06   erg/cm2
      90%_error_hi   3.82e-08  4.03e-08  7.23e-08  1.39e-06  1.51e-07  1.38e-06   erg/cm2
Peak flux      CPL   1.19e+00  1.67e+00  1.65e+00  2.33e+00  5.41e+00  6.85e+00   ph/cm2/s
      90%_error_low -2.08e-01 -1.34e-01 -1.28e-01 -6.99e-01 -3.48e-01 -8.10e-01   ph/cm2/s
      90%_error_hi   1.91e-01  1.34e-01  1.32e-01  5.87e-01  3.58e-01  7.36e-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
  202.8656    42.0997   0.0040    44.0309   -28.6781         6.9821156     48.430 TRIG_00158855                 
 
Foreground time interval of the image:
-24.932  13.332 (delta_t =  38.264 [sec])
Background time interval of the image:
-299.088 -24.932 (delta_t = 274.156 [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  -24.932 sec. to   13.332 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.1175     ( -0.0509945   0.0514033 )
Norm@50keV  : 1.29197E-02    ( -0.000378374   0.000377305 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.45 using 59 PHA bins.
# Reduced chi-squared =          1.078 for     57 degrees of freedom 
# Null hypothesis probability =   3.196470e-01
 
Photon flux (15-150 keV)    in 38.26 sec: 1.50124 ( -0.04705  0.04721 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.14015e-06 ( -1.45966e-07  1.46062e-07 ) ergs/cm2
    Cutoff power-law model
    Time interval is from  -24.932 sec. to   13.332 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.748952     ( -0.20976   0.220238 )
Epeak [keV] : 212.094      ( -55.7584 184.771 )
Norm@50keV  : 1.81892E-02    ( -0.00314468   0.00397158 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.17 using 59 PHA bins.
# Reduced chi-squared =         0.9315 for     56 degrees of freedom 
# Null hypothesis probability =   6.207718e-01
 
Photon flux (15-150 keV)    in 38.26 sec: 1.46644 ( -0.05035  0.05061 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.07955e-06 ( -1.51389e-07  1.50971e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from    2.880 sec. to    3.880 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.04472     ( -0.10689   0.108227 )
Norm@50keV  : 4.72949E-02    ( -0.00288214   0.00287359 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.49 using 59 PHA bins.
# Reduced chi-squared =          1.061 for     57 degrees of freedom 
# Null hypothesis probability =   3.510616e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.191900 0.221201 0.180780 0.147692 0.121606 2.97360E-02 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.03605e-07 ( -3.20634e-08  3.21546e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from    2.880 sec. to    3.880 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.84999     ( -0.244434   0.423304 )
Epeak [keV] : 358.860      ( -358.862 -358.862 )
Norm@50keV  : 5.71163E-02    ( -0.0119631   0.0274724 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.77 using 59 PHA bins.
# Reduced chi-squared =          1.067 for     56 degrees of freedom 
# Null hypothesis probability =   3.405402e-01
 
Photon flux (15-150 keV)    in 1 sec: 5.40991 ( -0.3485  0.35782 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.00599e-07 ( -3.29392e-08  3.28464e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = N/A sec.
Hardness ratio (energy fluence ratio) = N/A

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

    S(15-50 keV)  = N/A
S(50-150 keV) = N/A

    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 = 8.481412304303927E-01, IMY = 4.639230038776114E-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:
-299.088000 -24.932000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
244.9802 -15.6392    0.1  27.5  177.5  25.1842  90.5    0.1	Sco X-1                       
254.4615  35.3184    3.2  27.9   38.1   1.1619   3.7    1.5	Her X-1                       
255.9042 -38.0112   12.1  51.7  173.2   0.7525   1.0   10.8	4U 1700-377                   
256.3464 -36.5752   66.0  50.5  172.1   0.1349   0.2   10.1	GX 349+2                      
263.1369 -24.7344    7.9  43.0  157.1   0.8986   1.5    7.0	GX 1+4                        
268.3958  -1.4438    7.2  31.9  121.8   0.7235   1.6    1.7	SW J1753.5-0127               
270.4191 -25.1791    0.0  47.6  150.4  -1.3832  -1.5    9.5	GX 5-1                        
270.2909 -25.8999    5.1  48.1  151.2  -2.0530  -2.2    9.4	GRS 1758-258                  
273.9245 -14.1036    4.6  43.0  135.5   2.2969   2.5    6.2	GX 17+2                       
263.1154 -33.8635    6.0  50.6  164.1  -1.7314  -1.9    6.5	GX 354-0                      
279.6357  18.4385    2.5  39.9   84.9   5.0200   4.7 ------	UNKNOWN                       
276.7239  47.6749    2.1  48.3   43.8   6.2973   5.4 ------	UNKNOWN                       
221.8263  63.6156    2.6  53.8    0.9   3.7604   4.4 ------	UNKNOWN                       
212.4550 -36.6079    3.6  53.9 -143.5   4.9684   3.2 ------	UNKNOWN                       
211.9246 -36.5224    4.2  54.1 -143.0   4.2603   2.8 ------	UNKNOWN

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

    Time interval of the image:
-24.932000 13.332000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
244.9546 -15.6544    1.1  27.5  177.6  -0.8737 -10.9    1.7	Sco X-1                       
254.5245  35.4865    8.1  28.1   38.0   0.1344   1.4    9.2	Her X-1                       
255.9854 -37.8458   28.4  51.6  173.0  -0.0908  -0.4    0.1	4U 1700-377                   
256.4372 -36.4246    7.7  50.4  171.9   0.3009   1.5    0.1	GX 349+2                      
263.1358 -24.7962   42.2  43.1  157.2   0.0415   0.3    7.5	GX 1+4                        
268.4735  -1.5144   21.1  32.0  121.8   0.0673   0.5    7.3	SW J1753.5-0127               
270.1491 -24.9791    0.0  47.3  150.5  -0.5339  -2.5    9.5	GX 5-1                        
270.4245 -25.6858   10.8  48.0  150.9   0.2441   1.1    7.4	GRS 1758-258                  
274.1416 -14.0478    7.9  43.1  135.3   0.3212   1.5    7.9	GX 17+2                       
263.0939 -33.7222    4.9  50.5  164.0  -0.5100  -2.3    8.5	GX 354-0                      
202.8656  42.0997    0.2  44.0  -28.7   6.9816  48.4 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image: