Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Tue Jan 14 00:38:59 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger443861
======================================================================

  Trigger: 00443861      Segment: 000

  BAT Trigger Time: 317871879.616   [s; MET]
      Trigger Stop: 317871887.808   [s; MET]
               UTC: 2011-01-28T01:44:33.009360    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 193.874023479601   Dec: 28.0796152509682  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.29
     Image Trigger?:     NO
     Rate S/N Ratio:     10.0498756211209  [ if not an image trigger ]
     Image S/N Ratio:    8.29

  Analysis Position:   [ source = BAT ]
    RA: 193.874023479601   Dec: 28.0796152509682  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 193.87576961866   Dec: 28.0983042270185  [deg; J2000]  
        { 12h 55m 30.2s , +28d 05' 53.9" }
         +/- 1.83477379013706 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.84742287166061 [arcmin] (formal 1-sigma fit error)
    SNR: 12.7812082781226
 
  Angular difference between the analysis and refined position is 1.125141 arcmin
 
  Partial Coding Fraction: 0.375    [ including projection effects ]

  Duration
     T90: 14.1519999504089 +/- 2.48970440314957
        Measured from: -1.48000001907349
                   to: 12.6719999313354     [s; relative to TRIGTIME]
     T50: 7.0359999537468 +/- 2.07859953941348
        Measured from: 1.37199997901917
                   to: 8.40799993276596     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 3.57599997520447     
                   to: 4.57599997520447     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -2.53600001335144     
                   to: 14.0199999809265     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.116698   0.278400   0.252748   0.150812
           0.034952   0.036506   0.033874   0.030965 [error]
 Peak      0.014075   0.033157   0.038106   0.009884
           0.008752   0.009213   0.008625   0.007468 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   16.556   -2.536   14.020
T90    14.152   -1.480   12.672
T50     7.036    1.372    8.408
Peak    1.000    3.576    4.576
 
 
====== 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      -1.060    -0.240      0.253       -           -               -         3.30e-03     -4.62e-04          4.57e-04      50.640   57
CPL     -1.010    -0.287      1.018      998.523    -998.523      -998.523      3.50e-03     -3.50e-03          -2.67e-03      50.640   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      -1.239     -0.472     0.489       -           -               -         6.41e-03     -1.87e-03          1.86e-03      56.600   57
CPL     -0.059     -1.523     2.909       92.235      N/A           N/A         2.20e-02        N/A               N/A         55.370   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   4.62e-08  1.11e-07  2.14e-07  1.00e-06  5.78e-07  1.37e-06   erg/cm2
      90%_error_low -1.29e-08 -1.97e-08 -3.15e-08 -3.04e-07 -8.18e-08 -3.21e-07   erg/cm2
      90%_error_hi   1.43e-08  1.92e-08  3.11e-08  3.92e-07  8.22e-08  3.97e-07   erg/cm2
Peak flux       PL   2.06e-01  2.42e-01  2.05e-01  2.94e-01  7.57e-01  9.45e-01   ph/cm2/s
      90%_error_low -1.00e-01 -8.35e-02 -6.68e-02 -1.56e-01 -2.28e-01 -2.79e-01   ph/cm2/s
      90%_error_hi   1.20e-01  8.17e-02  6.56e-02  2.35e-01  2.31e-01  2.85e-01   ph/cm2/s
 
Fluence        CPL   4.59e-08  1.12e-07  2.15e-07  1.01e-06  5.76e-07  1.30e-06   erg/cm2
      90%_error_low -1.61e-08 -1.95e-08 -3.26e-08 -7.20e-07 -8.82e-08 -6.26e-07   erg/cm2
      90%_error_hi   1.17e-08  2.07e-08  3.78e-08  1.96e-07  8.34e-08  4.48e-07   erg/cm2
Peak flux      CPL   1.53e-01  2.58e-01  2.33e-01  1.19e-01  7.23e-01  7.63e-01   ph/cm2/s
      90%_error_low -1.15e-01 -9.85e-02 -8.11e-02 -1.19e-01 -2.33e-01 -2.61e-01   ph/cm2/s
      90%_error_hi   1.42e-01  9.79e-02  8.78e-02  2.62e-01  2.36e-01  3.60e-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
  193.8758    28.0983   0.0150    41.8420   166.5338         0.8845074     12.781 TRIG_00443861                 
 
Foreground time interval of the image:
 -2.536  14.020 (delta_t =  16.556 [sec])
Background time interval of the image:
-239.616  -2.536 (delta_t = 237.080 [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   -2.536 sec. to   14.020 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.06018     ( -0.24043   0.253343 )
Norm@50keV  : 3.29543E-03    ( -0.000462276   0.000457476 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.64 using 59 PHA bins.
# Reduced chi-squared =         0.8884 for     57 degrees of freedom 
# Null hypothesis probability =   7.110122e-01
 
Photon flux (15-150 keV)    in 16.56 sec: 0.380909 ( -0.055261  0.055647 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.78083e-07 ( -8.18334e-08  8.21699e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -2.536 sec. to   14.020 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.34287     ( -0.287017   1.01757 )
Epeak [keV] : 111.163      ( -999.073 -999.073 )
Norm@50keV  : 2.65776E-04    ( -0.000265497   0.000561551 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.70 using 59 PHA bins.
# Reduced chi-squared =         0.8876 for     56 degrees of freedom 
# Null hypothesis probability =   7.106289e-01
 
Photon flux (15-150 keV)    in 16.56 sec: 0.380659 ( -0.056114  0.056151 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.76449e-07 ( -8.81896e-08  8.34091e-08 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from    3.576 sec. to    4.576 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.23935     ( -0.472291   0.489686 )
Norm@50keV  : 6.40771E-03    ( -0.00186579   0.00186426 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.60 using 59 PHA bins.
# Reduced chi-squared =         0.9930 for     57 degrees of freedom 
# Null hypothesis probability =   4.899129e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.756594 ( -0.22831  0.230711 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.43147e-08 ( -1.97911e-08  2.0079e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from    3.576 sec. to    4.576 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.058932     ( -1.52305   2.90823 )
Epeak [keV] : 92.2353      (   )
Norm@50keV  : 2.20146E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.37 using 59 PHA bins.
# Reduced chi-squared =         0.9887 for     56 degrees of freedom 
# Null hypothesis probability =   4.986682e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.722935 ( -0.233164  0.236312 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.14455e-08 ( -2.0156e-08  2.07485e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 14.152 sec.
Hardness ratio (energy fluence ratio) = 1.91831660936

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

    S(15-50 keV)  = 1.5756575e-07
S(50-150 keV) = 4.205229e-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 = -8.708069617040499E-01, IMY = -2.085195981618592E-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:
-239.616000 -2.536000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.6422 -40.6276    4.4  45.8   -5.5   0.8761   2.6    6.8	Vela X-1                      
128.5839 -12.1898    2.3  42.4   36.6   1.8703   5.1 ------	UNKNOWN                       
206.2084  24.8471    2.7  47.0 -178.7   1.3554   4.4 ------	UNKNOWN                       
197.5743 -37.3933    3.5  38.0  -78.4   1.7310   3.4 ------	UNKNOWN

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

    Time interval of the image:
-2.536000 14.020000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.4348 -40.4739   12.3  45.8   -5.2   0.0694   0.9    6.5	Vela X-1                      
182.6479  42.2951    2.2  51.0  146.9   1.0419   5.4 ------	UNKNOWN                       
193.8758  28.0983    0.9  41.8  166.5   0.8846  12.8 ------	UNKNOWN                       
188.2429  10.3335    2.1  24.6  179.3   0.2313   5.6 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
123.684600 962.455800
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
173.6944  42.3303    2.9  21.7  131.3   1.7493   4.0 ------	UNKNOWN                       
184.9374  17.5979    2.7  13.3   34.9   1.5952   4.2 ------	UNKNOWN                       
184.6450 -28.1073    3.3  56.9    4.6   7.8236   3.5 ------	UNKNOWN                       
192.1187  53.3117    3.1  25.3  172.4   1.5920   3.7 ------	UNKNOWN                       
243.5305  59.2755    3.7  45.9 -152.3   2.9210   3.2 ------	UNKNOWN                       
223.6670  27.0307    3.7  26.4  -99.9   1.6868   3.1 ------	UNKNOWN