Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Sun Jan 12 04:34:01 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger553847
======================================================================

  Trigger: 00553847      Segment: 000

  BAT Trigger Time: 388004464   [s; MET]
      Trigger Stop: 388004528   [s; MET]
               UTC: 2013-04-18T19:00:53.544240    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 149.043481794784   Dec: 13.6495345491784  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    9.78
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    9.78

  Analysis Position:   [ source = BAT ]
    RA: 149.043481794784   Dec: 13.6495345491784  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 149.046174219361   Dec: 13.6735206031805  [deg; J2000]  
        { 09h 56m 11.1s , +13d 40' 24.7" }
         +/- 1.90746203895237 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.686867603475828 [arcmin] (formal 1-sigma fit error)
    SNR: 12.0911355246573
 
  Angular difference between the analysis and refined position is 1.447699 arcmin
 
  Partial Coding Fraction: 0.8984375    [ including projection effects ]

  Duration
     T90: 274.923999965191 +/- 39.3195305513169
        Measured from: -36.4200000166893
                   to: 238.503999948502     [s; relative to TRIGTIME]
     T50: 142.919999957085 +/- 30.4247480423713
        Measured from: -11.4639999866486
                   to: 131.455999970436     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -37.6759999990463     
                   to: -36.6759999990463     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -40.1719999909401     
                   to: 272.972000002861     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.252580   1.495362   0.522518   0.113974
           0.099321   0.101952   0.089316   0.079598 [error]
 Peak      0.027599   0.036905   0.000270   0.002243
           0.008548   0.008343   0.007472   0.006831 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  313.144  -40.172  272.972
T90   274.924  -36.420  238.504
T50   142.920  -11.464  131.456
Peak    1.000  -37.676  -36.676
 
 
====== 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      -2.067    -0.174      0.166       -           -               -         6.11e-04     -7.08e-05          6.95e-05      62.530   57
CPL     -1.295    -0.698      1.004       36.060     -34.441        15.911      1.76e-03     -1.09e-03          5.34e-03      59.760   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      -2.569     -0.737     0.555       -           -               -         3.29e-03     -1.66e-03          1.72e-03      64.170   57
CPL      1.585     -3.307     7.303       30.126     -19.670         8.622      1.48e+00     -1.48e+00          9.67e+04      59.470   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   4.17e-07  5.44e-07  5.19e-07  8.80e-07  1.77e-06  2.36e-06   erg/cm2
      90%_error_low -4.99e-08 -4.77e-08 -8.15e-08 -2.45e-07 -1.86e-07 -3.45e-07   erg/cm2
      90%_error_hi   5.09e-08  4.77e-08  8.36e-08  3.03e-07  1.90e-07  3.90e-07   erg/cm2
Peak flux       PL   3.83e-01  2.06e-01  6.94e-02  3.02e-02  6.75e-01  6.89e-01   ph/cm2/s
      90%_error_low -1.36e-01 -7.50e-02 -4.08e-02 -3.02e-02 -2.13e-01 -2.18e-01   ph/cm2/s
      90%_error_hi   1.41e-01  7.28e-02  5.00e-02  4.94e-02  2.13e-01  2.20e-01   ph/cm2/s
 
Fluence        CPL   3.95e-07  5.92e-07  4.82e-07  2.33e-07  1.62e-06  1.70e-06   erg/cm2
      90%_error_low -5.70e-08 -6.83e-08 -1.11e-07 -1.71e-07 -2.19e-07 -2.86e-07   erg/cm2
      90%_error_hi   5.66e-08  7.09e-08  1.00e-07  6.56e-07  2.40e-07  6.92e-07   erg/cm2
Peak flux      CPL   3.08e-01  3.11e-01  3.82e-02  1.67e-04  6.56e-01  6.58e-01   ph/cm2/s
      90%_error_low -3.08e-01 -1.12e-01 -3.82e-02 -1.67e-04 -2.03e-01 -2.05e-01   ph/cm2/s
      90%_error_hi   1.65e-01  1.15e-01  5.97e-02  1.14e-02  2.07e-01  2.06e-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
  149.0462    13.6735   0.0159    23.4622     8.9239         1.3631972     12.091 TRIG_00553847                 
 
Foreground time interval of the image:
-12.499  73.301 (delta_t =  85.800 [sec])
Background time interval of the image:




    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  -40.172 sec. to  272.972 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.06689     ( -0.173933   0.165508 )
Norm@50keV  : 6.11414E-04    ( -7.08451e-05   6.95453e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          62.53 using 59 PHA bins.
# Reduced chi-squared =          1.097 for     57 degrees of freedom 
# Null hypothesis probability =   2.862826e-01
 
Photon flux (15-150 keV)    in 313.1 sec: 9.46567E-02 ( -0.0081716  0.0081733 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.77371e-06 ( -1.85885e-07  1.90024e-07 ) ergs/cm2
    Cutoff power-law model
    Time interval is from  -40.172 sec. to  272.972 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.29476     ( -0.698033   1.00386 )
Epeak [keV] : 36.0597      ( -34.4419 15.91 )
Norm@50keV  : 1.76180E-03    ( -0.00109138   0.00534203 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.76 using 59 PHA bins.
# Reduced chi-squared =          1.067 for     56 degrees of freedom 
# Null hypothesis probability =   3.406589e-01
 
Photon flux (15-150 keV)    in 313.1 sec: 9.16470E-02 ( -0.0087099  0.008713 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.62276e-06 ( -2.1919e-07  2.39773e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from  -37.676 sec. to  -36.676 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.56949     ( -0.733163   0.558766 )
Norm@50keV  : 3.28866E-03    ( -0.00165737   0.00172448 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.17 using 59 PHA bins.
# Reduced chi-squared =          1.126 for     57 degrees of freedom 
# Null hypothesis probability =   2.397810e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.674594 ( -0.212554  0.213486 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.35151e-08 ( -1.24754e-08  1.37478e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from  -37.676 sec. to  -36.676 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.58475     ( -3.35102   7.25837 )
Epeak [keV] : 30.1260      ( -19.7381 8.55405 )
Norm@50keV  : 1.48164    ( -1.77319   96687.4 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.47 using 59 PHA bins.
# Reduced chi-squared =          1.062 for     56 degrees of freedom 
# Null hypothesis probability =   3.505674e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.656215 ( -0.203292  0.206972 ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 274.924 sec.
Hardness ratio (energy fluence ratio) = 0.95472862449

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

    S(15-50 keV)  = 9.614502e-07
S(50-150 keV) = 8.122498e-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 = 4.287745920250035E-01, IMY = -6.732734992307260E-02

    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:

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

    Time interval of the image:
-12.499400 73.300640
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5463 -40.4666   21.7  32.7  173.3   0.0726   0.5    5.3	Vela X-1                      
166.4303   8.2186    2.5  30.8   45.5   0.7249   4.5 ------	UNKNOWN                       
151.3353 -36.7568    2.1  30.4  148.9   0.7712   5.5 ------	UNKNOWN                       
149.0462  13.6735    1.0  23.5    8.9   1.3635  12.1 ------	UNKNOWN                       
125.5357 -49.0590    2.5  42.8 -179.1   0.8027   4.6 ------	UNKNOWN                       
140.8554  33.3967    2.1  41.5  -12.3   0.8435   5.5 ------	UNKNOWN                       
111.9364 -48.7412    2.3  47.1 -168.0   1.0332   5.0 ------	UNKNOWN                       
118.4669 -31.8436    3.1  31.2 -155.9   0.4318   3.7 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
118.900600 353.900600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5180 -40.3947    9.7  55.5  172.2   1.3643   1.3    9.6	Vela X-1                      
151.6856 -33.8839    2.1  47.6  156.7   3.5804   5.5 ------	UNKNOWN                       
175.5517  25.1485    2.6  27.4   41.0   1.0712   4.5 ------	UNKNOWN                       
140.9335 -13.0569    3.2  27.9  176.8   0.7285   3.7 ------	UNKNOWN                       
149.0096  13.6880    1.9   0.0  -66.8   1.0519   6.0 ------	UNKNOWN                       
108.4854 -30.3136    3.7  58.8 -159.3   4.6528   3.1 ------	UNKNOWN                       
111.3081  49.5002    3.7  47.3  -53.0   3.1853   3.1 ------	UNKNOWN