Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Sun Jan 19 19:49:40 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger337914
======================================================================

  Trigger: 00337914      Segment: 000

  BAT Trigger Time: 251614443.328   [s; MET]
      Trigger Stop: 251614443.584   [s; MET]
               UTC: 2008-12-22T04:53:59.974180    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 22.7514205034355   Dec: -34.1283751474552  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.08
     Image Trigger?:     NO
     Rate S/N Ratio:     22.0454076850486  [ if not an image trigger ]
     Image S/N Ratio:    8.08

  Analysis Position:   [ source = BAT ]
    RA: 22.7514205034355   Dec: -34.1283751474552  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 22.7485251076996   Dec: -34.0943365765093  [deg; J2000]  
        { 01h 30m 59.6s , -34d 05' 39.6" }
         +/- 0.439601297412941 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.135195703253786 [arcmin] (formal 1-sigma fit error)
    SNR: 98.4088470214885
 
  Angular difference between the analysis and refined position is 2.047373 arcmin
 
  Partial Coding Fraction: 1.015625    [ including projection effects ]

  Duration
     T90: 33 +/- 4
        Measured from: 0.671999990940094
                   to: 33.6719999909401     [s; relative to TRIGTIME]
     T50: 6 +/- 1
        Measured from: 2.67199999094009
                   to: 8.67199999094009     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 3.67199999094009     
                   to: 4.67199999094009     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -1.32800000905991     
                   to: 63.6719999909401     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     2.132176   3.049748   2.520448   0.608099
           0.041278   0.044379   0.040031   0.032145 [error]
 Peak      0.211433   0.353157   0.334227   0.088667
           0.007539   0.009080   0.008855   0.006119 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   65.000   -1.328   63.672
T90    33.000    0.672   33.672
T50     6.000    2.672    8.672
Peak    1.000    3.672    4.672
 
 
====== 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      -1.410    -0.038      0.038       -           -               -         8.33e-03     -1.65e-04          1.65e-04      43.990   57
CPL     -1.198    -0.152      0.157      217.875     -68.097       366.114      1.03e-02     -1.42e-03          1.71e-03      38.290   56
 
 
=== 1-s peak 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      -1.197     -0.053     0.053       -           -               -         6.50e-02     -1.93e-03          1.93e-03      57.560   57
CPL     -0.786     -0.215     0.226      166.289     -39.599       114.974      9.96e-02     -1.95e-02          2.56e-02      46.490   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   6.36e-07  1.23e-06  1.86e-06  6.06e-06  5.22e-06  9.78e-06   erg/cm2
      90%_error_low -2.68e-08 -3.01e-08 -4.31e-08 -3.28e-07 -1.07e-07 -3.45e-07   erg/cm2
      90%_error_hi   2.73e-08  3.01e-08  4.31e-08  3.40e-07  1.07e-07  3.56e-07   erg/cm2
Peak flux       PL   2.00e+00  2.41e+00  2.10e+00  3.15e+00  7.62e+00  9.66e+00   ph/cm2/s
      90%_error_low -1.18e-01 -8.66e-02 -7.20e-02 -2.27e-01 -2.36e-01 -3.02e-01   ph/cm2/s
      90%_error_hi   1.21e-01  8.63e-02  7.17e-02  2.38e-01  2.36e-01  3.04e-01   ph/cm2/s
 
Fluence        CPL   5.99e-07  1.24e-06  1.89e-06  4.65e-06  5.16e-06  8.39e-06   erg/cm2
      90%_error_low -3.61e-08 -3.13e-08 -5.00e-08 -7.75e-07 -1.18e-07 -7.80e-07   erg/cm2
      90%_error_hi   3.68e-08  3.14e-08  5.03e-08  9.64e-07  1.18e-07  9.64e-07   erg/cm2
Peak flux      CPL   1.80e+00  2.46e+00  2.20e+00  2.11e+00  7.46e+00  8.57e+00   ph/cm2/s
      90%_error_low -1.51e-01 -9.31e-02 -8.74e-02 -3.79e-01 -2.49e-01 -4.67e-01   ph/cm2/s
      90%_error_hi   1.55e-01  9.35e-02  8.82e-02  4.82e-01  2.49e-01  5.45e-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
   22.7485   -34.0943   0.0019    11.3178   177.1952         6.6018555     98.409 TRIG_00337914                 
 
Foreground time interval of the image:
 -1.328   9.773 (delta_t =  11.101 [sec])
Background time interval of the image:
-239.328  -1.328 (delta_t = 238.000 [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   -1.328 sec. to   63.672 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.41002     ( -0.0382673   0.038309 )
Norm@50keV  : 8.33358E-03    ( -0.000165216   0.000165182 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          43.99 using 59 PHA bins.
# Reduced chi-squared =         0.7718 for     57 degrees of freedom 
# Null hypothesis probability =   8.964580e-01
 
Photon flux (15-150 keV)    in 65 sec: 1.01722 ( -0.02284  0.02292 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.22412e-06 ( -1.07264e-07  1.07304e-07 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -1.328 sec. to   63.672 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.19803     ( -0.152203   0.157448 )
Epeak [keV] : 217.875      ( -68.0971 366.114 )
Norm@50keV  : 1.03043E-02    ( -0.00142233   0.00170757 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          38.29 using 59 PHA bins.
# Reduced chi-squared =         0.6838 for     56 degrees of freedom 
# Null hypothesis probability =   9.661298e-01
 
Photon flux (15-150 keV)    in 65 sec: 0.999556 ( -0.025747  0.025874 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.15553e-06 ( -1.18053e-07  1.17898e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from    3.672 sec. to    4.672 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.1966     ( -0.0531021   0.0531976 )
Norm@50keV  : 6.49538E-02    ( -0.00193208   0.00193196 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.56 using 59 PHA bins.
# Reduced chi-squared =          1.010 for     57 degrees of freedom 
# Null hypothesis probability =   4.543199e-01
 
Photon flux (15-150 keV)    in 1 sec: 7.62066 ( -0.23565  0.23588 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.5969e-07 ( -2.16028e-08  2.16596e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from    3.672 sec. to    4.672 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.785548     ( -0.21542   0.226475 )
Epeak [keV] : 166.289      ( -39.5988 114.974 )
Norm@50keV  : 9.96149E-02    ( -0.0195116   0.0255905 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          46.49 using 59 PHA bins.
# Reduced chi-squared =         0.8301 for     56 degrees of freedom 
# Null hypothesis probability =   8.137136e-01
 
Photon flux (15-150 keV)    in 1 sec: 7.45987 ( -0.24874  0.24898 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.44956e-07 ( -2.32429e-08  2.31879e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 33.0 sec.
Hardness ratio (energy fluence ratio) = 1.50525533797

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

    S(15-50 keV)  = 1.8701243e-06
S(50-150 keV) = 3.354039e-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 = -1.999025555549942E-01, IMY = -9.793488143692878E-03

    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:
-239.328000 -1.328000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 56.0987 -33.1744    2.5  36.1  141.2   1.3390   4.6 ------	UNKNOWN                       
 52.9960 -50.8219    2.7  38.8  170.3   1.0603   4.3 ------	UNKNOWN                       
358.6813   3.6627    2.0  32.7   -5.0   1.1304   5.7  233.6	UNKNOWN

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

    Time interval of the image:
-1.328000 9.772590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 29.8956   9.8769    2.1  37.1   51.4   0.8007   5.6 ------	UNKNOWN                       
 22.7485 -34.0943    0.1  11.3  177.2   6.6018  98.4 ------	UNKNOWN                       
 27.5840 -51.5693    2.5  28.5 -167.5   0.3344   4.7 ------	UNKNOWN                       
342.0148 -15.4260    2.5  32.9  -52.5   0.4273   4.6 ------	UNKNOWN                       
327.9618  -3.4163    1.9  50.6  -45.2   1.8695   5.9 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
41.172590 962.775200
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
  3.7709  -6.5825    2.7  32.6   -5.1   2.2596   4.3  454.9	UNKNOWN                       
351.9699  12.9890    2.8  55.5   -5.5   5.8376   4.2 ------	UNKNOWN                       
 11.7039 -44.9014    2.3  13.7 -113.4   2.0909   5.0 ------	UNKNOWN                       
346.6504 -48.6096    2.9  30.3  -97.8   2.3700   4.0 ------	UNKNOWN                       
332.1966 -19.0877    4.0  47.1  -53.1   6.1514   2.9 ------	UNKNOWN                       
330.3708 -46.7781    5.2  41.0  -92.5   5.4521   2.2 ------	UNKNOWN                       
328.8770 -60.0872    2.6  43.1 -112.2  10.1298   4.5 ------	UNKNOWN