Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Mon Jan 20 07:39:41 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger287364
======================================================================

  Trigger: 00287364      Segment: 000

  BAT Trigger Time: 208404714.56   [s; MET]
      Trigger Stop: 208404715.584   [s; MET]
               UTC: 2007-08-10T02:11:52.414980    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 189.939176238456   Dec: 10.7444551264059  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    12.68
     Image Trigger?:     NO
     Rate S/N Ratio:     20.7846096908265  [ if not an image trigger ]
     Image S/N Ratio:    12.68

  Analysis Position:   [ source = BAT ]
    RA: 189.939176238456   Dec: 10.7444551264059  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 189.948936942719   Dec: 10.7479977043999  [deg; J2000]  
        { 12h 39m 47.7s , +10d 44' 52.8" }
         +/- 1.20068503580658 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.400345717458607 [arcmin] (formal 1-sigma fit error)
    SNR: 23.423308583952
 
  Angular difference between the analysis and refined position is 0.613378 arcmin
 
  Partial Coding Fraction: 0.5390625    [ including projection effects ]

  Duration
     T90: 9.04000002145767 +/- 2.68246155678399
        Measured from: -1.50400000810623
                   to: 7.53600001335144     [s; relative to TRIGTIME]
     T50: 3.62000000476837 +/- 0.441687673669902
        Measured from: 0.236000001430511
                   to: 3.85600000619888     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.111999988555908     
                   to: 0.888000011444092     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -2.30399999022484     
                   to: 10.4399999976158     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.425784   0.476947   0.231047   0.028330
           0.025128   0.026407   0.022513   0.019396 [error]
 Peak      0.063323   0.087205   0.047272   0.016409
           0.007483   0.008131   0.006866   0.005571 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   12.744   -2.304   10.440
T90     9.040   -1.504    7.536
T50     3.620    0.236    3.856
Peak    1.000   -0.112    0.888
 
 
====== 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: 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      -2.051    -0.128      0.124       -           -               -         5.70e-03     -4.66e-04          4.59e-04      71.570   57
CPL     -1.370    -0.569      0.669       38.993     -21.890        11.322      1.39e-02     -7.24e-03          1.96e-02      67.350   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      -1.812     -0.192     0.184       -           -               -         1.36e-02     -1.68e-03          1.65e-03      57.130   57
CPL     -1.247     -0.684     0.908       60.559     -14.321       -60.559      2.78e-02     -1.52e-02          5.96e-02      55.500   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   1.56e-07  2.05e-07  1.98e-07  3.41e-07  6.72e-07  9.00e-07   erg/cm2
      90%_error_low -1.50e-08 -1.35e-08 -2.21e-08 -7.03e-08 -5.07e-08 -9.56e-08   erg/cm2
      90%_error_hi   1.53e-08  1.35e-08  2.23e-08  8.16e-08  5.13e-08  1.04e-07   erg/cm2
Peak flux       PL   7.57e-01  6.34e-01  3.61e-01  3.05e-01  1.89e+00  2.06e+00   ph/cm2/s
      90%_error_low -1.21e-01 -6.89e-02 -5.72e-02 -8.47e-02 -2.05e-01 -2.23e-01   ph/cm2/s
      90%_error_hi   1.26e-01  6.87e-02  5.71e-02  1.01e-01  2.05e-01  2.23e-01   ph/cm2/s
 
Fluence        CPL   1.46e-07  2.21e-07  1.92e-07  1.15e-07  6.29e-07  6.74e-07   erg/cm2
      90%_error_low -1.75e-08 -1.88e-08 -2.66e-08 -6.54e-08 -5.98e-08 -9.07e-08   erg/cm2
      90%_error_hi   1.76e-08  1.93e-08  2.52e-08  1.63e-07  6.17e-08  1.71e-07   erg/cm2
Peak flux      CPL   7.06e-01  6.77e-01  3.70e-01  1.56e-01  1.85e+00  1.91e+00   ph/cm2/s
      90%_error_low -1.41e-01 -8.91e-02 -6.28e-02 -9.50e-02 -2.11e-01 -2.38e-01   ph/cm2/s
      90%_error_hi   1.43e-01  9.32e-02  6.33e-02  1.85e-01  2.10e-01  2.89e-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
  189.9489    10.7480   0.0082    35.5710   -39.9836         1.2111547     23.423 TRIG_00287364                 
 
Foreground time interval of the image:
 -2.304  10.440 (delta_t =  12.744 [sec])
Background time interval of the image:
-239.560  -2.304 (delta_t = 237.256 [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   -2.304 sec. to   10.440 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.05122     ( -0.128081   0.123778 )
Norm@50keV  : 5.70256E-03    ( -0.000466089   0.000459432 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          71.57 using 59 PHA bins.
# Reduced chi-squared =          1.256 for     57 degrees of freedom 
# Null hypothesis probability =   9.262713e-02
 
Photon flux (15-150 keV)    in 12.74 sec: 0.876233 ( -0.058498  0.058554 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.72295e-07 ( -5.07258e-08  5.13065e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -2.304 sec. to   10.440 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.37045     ( -0.56947   0.66924 )
Epeak [keV] : 38.9931      ( -21.8899 11.3221 )
Norm@50keV  : 1.39243E-02    ( -0.00724119   0.0196343 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          67.35 using 59 PHA bins.
# Reduced chi-squared =          1.203 for     56 degrees of freedom 
# Null hypothesis probability =   1.424311e-01
 
Photon flux (15-150 keV)    in 12.74 sec: 0.849622 ( -0.062589  0.062476 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.2923e-07 ( -5.98011e-08  6.17405e-08 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from   -0.112 sec. to    0.888 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.81239     ( -0.192153   0.184142 )
Norm@50keV  : 1.36239E-02    ( -0.00167932   0.00164899 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.13 using 59 PHA bins.
# Reduced chi-squared =          1.002 for     57 degrees of freedom 
# Null hypothesis probability =   4.704181e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.88654 ( -0.20517  0.20528 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.25392e-07 ( -1.5542e-08  1.5722e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -0.112 sec. to    0.888 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.24747     ( -0.684187   0.907713 )
Epeak [keV] : 60.5585      ( -14.3212 -60.5585 )
Norm@50keV  : 2.78122E-02    ( -0.015193   0.0595857 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.50 using 59 PHA bins.
# Reduced chi-squared =         0.9911 for     56 degrees of freedom 
# Null hypothesis probability =   4.936807e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.85338 ( -0.21066  0.21006 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.20127e-07 ( -1.70599e-08  1.72266e-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 = 5.479799323756466E-01, IMY = 4.595426592837669E-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:
-239.560000 -2.304000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
170.2971 -60.4588   10.2  44.9 -173.5  -0.3748  -1.1    9.9	Cen X-3                       
186.7318 -62.7789    2.5  42.2  175.3   1.4083   4.6    2.1	GX 301-2                      
244.9808 -15.6249    0.6  39.4   71.7  16.1436  20.5    0.9	Sco X-1                       
215.1364 -13.5819    2.7  13.8   37.3   0.6957   4.3 ------	UNKNOWN                       
147.7772 -60.4902    2.8  54.3 -166.0   2.3286   4.1 ------	UNKNOWN

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

    Time interval of the image:
-2.304000 10.440000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
170.3986 -60.5631    5.8  44.9 -173.7  -0.1226  -2.0    4.3	Cen X-3                       
186.6714 -62.7748   54.8  42.2  175.3  -0.0131  -0.2    0.5	GX 301-2                      
244.8227 -15.5003    0.0  39.3   71.4  -0.3217  -2.5   12.4	Sco X-1                       
231.9223  20.9241    2.8  51.1   18.3   0.5048   4.2 ------	UNKNOWN                       
189.9489  10.7480    0.5  35.6  -40.0   1.2111  23.4 ------	UNKNOWN                       
174.2375  -4.3244    2.7  33.7  -78.6   0.2803   4.2 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
71.740600 502.840600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']