Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Wed Jan 22 19:48:06 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger160672
======================================================================

  Trigger: 00160672      Segment: 000

  BAT Trigger Time: 151630313.472   [s; MET]
      Trigger Stop: 151630314.496   [s; MET]
               UTC: 2005-10-21T23:31:53.676000    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 126.037109457011   Dec: -45.5194340356682  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    6.77
     Image Trigger?:     NO
     Rate S/N Ratio:     12.8062484748657  [ if not an image trigger ]
     Image S/N Ratio:    6.77

  Analysis Position:   [ source = BAT ]
    RA: 126.037109457011   Dec: -45.5194340356682  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 126.064511217234   Dec: -45.5333813978045  [deg; J2000]  
        { 08h 24m 15.5s , -45d 32' 00.2" }
         +/- 1.30959980926905 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.389546161074393 [arcmin] (formal 1-sigma fit error)
    SNR: 20.6908112225524
 
  Angular difference between the analysis and refined position is 1.423732 arcmin
 
  Partial Coding Fraction: 0.8828125    [ including projection effects ]

  Duration
     T90: 46.5119999647141 +/- 11.4295224811572
        Measured from: -3.13600000739098
                   to: 43.3759999573231     [s; relative to TRIGTIME]
     T50: 19.2319999933243 +/- 5.62990868988388
        Measured from: 0.84799998998642
                   to: 20.0799999833107     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.668000012636185     
                   to: 0.331999987363815     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -4.64000001549721     
                   to: 54.6879999935627     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.382033   0.543528   0.432633   0.081854
           0.038033   0.039766   0.035643   0.032876 [error]
 Peak      0.027368   0.035387   0.024993   0.007713
           0.005198   0.005754   0.005182   0.004676 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   59.328   -4.640   54.688
T90    46.512   -3.136   43.376
T50    19.232    0.848   20.080
Peak    1.000   -0.668    0.332
 
 
====== 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      -1.544    -0.139      0.137       -           -               -         1.60e-03     -1.35e-04          1.34e-04      65.550   57
CPL     -0.482    -0.627      0.727       68.683     -11.726        31.821      5.66e-03     -2.93e-03          7.45e-03      56.440   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      -1.378     -0.322     0.319       -           -               -         6.21e-03     -1.12e-03          1.11e-03      68.030   57
CPL     -1.339      N/A       N/A         855.617      N/A           N/A         6.51e-03        N/A               N/A         68.070   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   1.26e-07  2.26e-07  3.10e-07  8.80e-07  8.94e-07  1.54e-06   erg/cm2
      90%_error_low -1.61e-08 -1.85e-08 -3.43e-08 -1.88e-07 -8.21e-08 -2.20e-07   erg/cm2
      90%_error_hi   1.66e-08  1.85e-08  3.43e-08  2.19e-07  8.31e-08  2.45e-07   erg/cm2
Peak flux       PL   2.27e-01  2.46e-01  1.89e-01  2.39e-01  7.53e-01  9.02e-01   ph/cm2/s
      90%_error_low -6.88e-02 -4.77e-02 -4.32e-02 -9.67e-02 -1.34e-01 -1.65e-01   ph/cm2/s
      90%_error_hi   7.47e-02  4.67e-02  4.23e-02  1.31e-01  1.34e-01  1.69e-01   ph/cm2/s
 
Fluence        CPL   1.07e-07  2.51e-07  3.21e-07  2.28e-07  8.19e-07  9.07e-07   erg/cm2
      90%_error_low -1.98e-08 -2.38e-08 -3.94e-08 -1.12e-07 -8.86e-08 -1.42e-07   erg/cm2
      90%_error_hi   2.00e-08  2.44e-08  3.94e-08  2.40e-07  9.18e-08  2.48e-07   erg/cm2
Peak flux      CPL   2.30e-01  2.45e-01  1.88e-01  2.51e-01  7.55e-01  9.17e-01   ph/cm2/s
      90%_error_low -4.21e-02 -4.77e-02 -4.35e-02     N/A   -1.41e-01 -2.63e-01   ph/cm2/s
      90%_error_hi   4.21e-02  4.97e-02  4.82e-02     N/A    1.36e-01  1.46e-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
  126.0645   -45.5334   0.0093    27.3376   -18.7203         0.9865420     20.691 TRIG_00160672                 
 
Foreground time interval of the image:
 -4.640  14.429 (delta_t =  19.069 [sec])
Background time interval of the image:
-299.472  -4.640 (delta_t = 294.832 [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   -4.640 sec. to   54.688 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.54427     ( -0.138839   0.136933 )
Norm@50keV  : 1.59861E-03    ( -0.000135145   0.00013429 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.55 using 59 PHA bins.
# Reduced chi-squared =          1.150 for     57 degrees of freedom 
# Null hypothesis probability =   2.043782e-01
 
Photon flux (15-150 keV)    in 59.33 sec: 0.202046 ( -0.016346  0.01636 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.93747e-07 ( -8.20866e-08  8.30727e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -4.640 sec. to   54.688 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.482356     ( -0.627235   0.727364 )
Epeak [keV] : 68.6831      ( -11.7264 31.8206 )
Norm@50keV  : 5.65971E-03    ( -0.00292855   0.00745014 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.44 using 59 PHA bins.
# Reduced chi-squared =          1.008 for     56 degrees of freedom 
# Null hypothesis probability =   4.585278e-01
 
Photon flux (15-150 keV)    in 59.33 sec: 0.192510 ( -0.017254  0.017244 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.19134e-07 ( -8.86266e-08  9.18161e-08 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from   -0.668 sec. to    0.332 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.37775     ( -0.32154   0.319025 )
Norm@50keV  : 6.21292E-03    ( -0.00112154   0.00111115 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          68.03 using 59 PHA bins.
# Reduced chi-squared =          1.193 for     57 degrees of freedom 
# Null hypothesis probability =   1.504498e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.752898 ( -0.134009  0.134225 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.03198e-08 ( -1.22049e-08  1.24113e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -0.668 sec. to    0.332 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.33881     (       )
Epeak [keV] : 855.617      (   )
Norm@50keV  : 6.51011E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          68.07 using 59 PHA bins.
# Reduced chi-squared =          1.215 for     56 degrees of freedom 
# Null hypothesis probability =   1.293948e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.755143 ( -0.141493  0.135754 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.09186e-08 ( -1.67626e-08  1.45142e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 46.512 sec.
Hardness ratio (energy fluence ratio) = 1.27755591007

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

    S(15-50 keV)  = 3.579476e-07
S(50-150 keV) = 4.611837e-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 = 4.896213709906972E-01, IMY = 1.659209379960770E-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:
-299.472000 -4.640000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5655 -40.5436    4.9  24.8  -37.4   0.4747   2.4    1.8	Vela X-1                      
108.4566 -75.3176    2.6  57.5   -9.5   4.6938   4.4 ------	UNKNOWN                       
146.2396  10.1688    3.1  36.7 -152.9   0.9414   3.8 ------	UNKNOWN                       
131.7479 -74.5552    3.5  56.4  -16.6   2.6311   3.3 ------	UNKNOWN                       
137.4659 -72.2597    3.7  54.6  -19.2   2.0894   3.1 ------	UNKNOWN                       
148.9214 -31.8150    2.6  27.1  -68.9   1.0282   4.4 ------	UNKNOWN                       
152.7146  17.8181    3.8  46.6 -153.0   1.2187   3.0 ------	UNKNOWN

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

    Time interval of the image:
-4.640000 14.428600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.6077 -40.6528    6.6  24.9  -37.3  -0.0806  -1.8    6.9	Vela X-1                      
139.6703  24.8137    2.2  46.2 -172.4   0.4223   5.3 ------	UNKNOWN                       
126.0645 -45.5334    0.6  27.3  -18.7   0.9865  20.7 ------	UNKNOWN                       
138.9544 -51.0982    2.7  35.2  -31.4   0.2352   4.4 ------	UNKNOWN                       
129.0326 -75.3728    2.2  57.1  -15.6   1.1499   5.2 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
64.428610 302.541000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.3137 -40.4195    0.0   8.5 -124.8  -0.0756  -0.5   12.7	Vela X-1                      
169.9424 -60.5907    0.0  29.6  -44.7  -0.1672  -0.8   11.2	Cen X-3                       
186.5604 -62.8530    8.4  37.6  -41.8   0.3526   1.4    5.6	GX 301-2                      
115.5094   5.7750    2.7  52.2  165.6   2.6459   4.3 ------	UNKNOWN                       
196.5880 -78.8444    2.3  41.8  -17.0   1.2467   5.1 ------	UNKNOWN