Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Sun Jan 12 04:21:37 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger553977
======================================================================

  Trigger: 00553977      Segment: 000

  BAT Trigger Time: 388135720   [s; MET]
      Trigger Stop: 388135784   [s; MET]
               UTC: 2013-04-20T07:28:29.538420    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 196.099811619603   Dec: 59.4236969469464  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    12.77
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    12.77

  Analysis Position:   [ source = BAT ]
    RA: 196.099811619603   Dec: 59.4236969469464  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 196.120226401989   Dec: 59.4221532318767  [deg; J2000]  
        { 13h 04m 28.9s , +59d 25' 19.8" }
         +/- 0.618923382094513 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.185652492286297 [arcmin] (formal 1-sigma fit error)
    SNR: 60.3642717565921
 
  Angular difference between the analysis and refined position is 0.629943 arcmin
 
  Partial Coding Fraction: 0.8671875    [ including projection effects ]

  Duration
     T90: 121.135999977589 +/- 11.7493788427888
        Measured from: 37.311999976635
                   to: 158.447999954224     [s; relative to TRIGTIME]
     T50: 28.0799999833107 +/- 2.06763243083796
        Measured from: 99.4039999842644
                   to: 127.483999967575     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 110.667999982834     
                   to: 111.667999982834     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -14.9879999756813     
                   to: 188.128000020981     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     5.354719   5.804453   2.558378   0.380919
           0.089882   0.092674   0.079994   0.068841 [error]
 Peak      0.124203   0.166023   0.092143   0.012816
           0.008029   0.008647   0.006984   0.005313 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  203.116  -14.988  188.128
T90   121.136   37.312  158.448
T50    28.080   99.404  127.484
Peak    1.000  110.668  111.668
 
 
====== 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      -2.183    -0.053      0.053       -           -               -         3.98e-03     -1.13e-04          1.13e-04      65.770   57
CPL     -1.520    -0.243      0.259       33.358      -8.393         4.968      8.81e-03     -2.19e-03          3.17e-03      41.830   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      -1.794     -0.108     0.106       -           -               -         2.49e-02     -1.70e-03          1.69e-03      61.090   57
CPL     -1.030     -0.457     0.515       57.956      -9.045        22.055      6.48e-02     -2.78e-02          5.82e-02      52.370   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   1.97e-06  2.39e-06  2.11e-06  3.20e-06  7.59e-06  9.67e-06   erg/cm2
      90%_error_low -8.96e-08 -6.30e-08 -8.38e-08 -2.64e-07 -1.98e-07 -3.36e-07   erg/cm2
      90%_error_hi   9.11e-08  6.30e-08  8.40e-08  2.80e-07  1.98e-07  3.45e-07   erg/cm2
Peak flux       PL   1.36e+00  1.15e+00  6.65e-01  5.71e-01  3.43e+00  3.75e+00   ph/cm2/s
      90%_error_low -1.31e-01 -7.31e-02 -5.80e-02 -9.17e-02 -2.18e-01 -2.33e-01   ph/cm2/s
      90%_error_hi   1.34e-01  7.30e-02  5.79e-02  1.02e-01  2.18e-01  2.33e-01   ph/cm2/s
 
Fluence        CPL    N/A      N/A      N/A      N/A      N/A      N/A      erg/cm2
      90%_error_low -8.96e-08 -6.30e-08 -8.38e-08 -2.64e-07 -1.98e-07 -3.36e-07   erg/cm2
      90%_error_hi   9.11e-08  6.30e-08  8.40e-08  2.80e-07  1.98e-07  3.45e-07   erg/cm2
Peak flux      CPL   1.23e+00  1.25e+00  6.85e-01  2.43e-01  3.33e+00  3.41e+00   ph/cm2/s
      90%_error_low -1.52e-01 -9.42e-02 -6.51e-02 -9.68e-02 -2.25e-01 -2.49e-01   ph/cm2/s
      90%_error_hi   1.54e-01  9.67e-02  6.51e-02  1.55e-01  2.25e-01  2.63e-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
  196.1202    59.4222   0.0032    28.5708   -19.0835        15.1380127     60.364 TRIG_00553977                 
 
Foreground time interval of the image:
-14.988 188.128 (delta_t = 203.116 [sec])
Background time interval of the image:
-239.000 -14.988 (delta_t = 224.012 [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  -14.988 sec. to  188.128 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.18283     ( -0.0533654   0.0528974 )
Norm@50keV  : 3.98128E-03    ( -0.000113473   0.000113032 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.77 using 59 PHA bins.
# Reduced chi-squared =          1.154 for     57 degrees of freedom 
# Null hypothesis probability =   1.992839e-01
 
Photon flux (15-150 keV)    in 203.1 sec: 0.653288 ( -0.019355  0.019462 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.58613e-06 ( -1.98079e-07  1.98355e-07 ) ergs/cm2
    Cutoff power-law model
    Time interval is from  -14.988 sec. to  188.128 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.52033     ( -0.242763   0.258511 )
Epeak [keV] : 33.3581      ( -8.39554 4.96578 )
Norm@50keV  : 8.81119E-03    ( -0.00219018   0.0031692 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          41.83 using 59 PHA bins.
# Reduced chi-squared =         0.7470 for     56 degrees of freedom 
# Null hypothesis probability =   9.203806e-01
 
Photon flux (15-150 keV)    in 203.1 sec: 0.616952 ( -0.022685  0.022844 ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from  110.668 sec. to  111.668 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.79369     ( -0.107671   0.105775 )
Norm@50keV  : 2.49332E-02    ( -0.00170197   0.00168895 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.09 using 59 PHA bins.
# Reduced chi-squared =          1.072 for     57 degrees of freedom 
# Null hypothesis probability =   3.313328e-01
 
Photon flux (15-150 keV)    in 1 sec: 3.42756 ( -0.21774  0.21793 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.29625e-07 ( -1.59469e-08  1.60551e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from  110.668 sec. to  111.668 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.03025     ( -0.457381   0.515239 )
Epeak [keV] : 57.9559      ( -9.04558 22.0548 )
Norm@50keV  : 6.48331E-02    ( -0.0278235   0.0581565 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.37 using 59 PHA bins.
# Reduced chi-squared =         0.9353 for     56 degrees of freedom 
# Null hypothesis probability =   6.128938e-01
 
Photon flux (15-150 keV)    in 1 sec: 3.33373 ( -0.22466  0.22473 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.16386e-07 ( -1.75843e-08  1.77779e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 121.136 sec.
Hardness ratio (energy fluence ratio) = 0.881007847803

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

    S(15-50 keV)  = 4.362328e-06
S(50-150 keV) = 3.223865e-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 = 5.146293895582025E-01, IMY = 1.780407519443355E-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:
-239.000000 -14.988000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
191.4884   6.3957    1.9  39.2   86.4   4.5464   6.0 ------	UNKNOWN                       
161.4346  -3.5554    2.4  41.9  135.8   2.7871   4.8 ------	UNKNOWN                       
131.5680   9.0999    3.5  42.5 -175.3   0.9287   3.3 ------	UNKNOWN                       
124.5734   9.2618    3.0  47.1 -168.0   1.3561   3.8 ------	UNKNOWN

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

    Time interval of the image:
-14.988000 188.128000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
165.2465  -3.6810    2.3  41.8  130.1   4.2585   5.1 ------	UNKNOWN                       
158.2432  -7.4544    2.7  46.2  139.6   4.3155   4.2 ------	UNKNOWN                       
216.2192  54.5891    2.1  37.3   -4.0   1.7428   5.5 ------	UNKNOWN                       
134.8137  20.4374    2.7  32.3 -165.6   1.1622   4.3 ------	UNKNOWN                       
196.1202  59.4222    0.2  28.6  -19.1  15.1381  60.4 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
719.500580 963.136200
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4972  35.3207    2.2  44.3   18.8   2.3111   5.3    2.3	Her X-1                       
191.9427  35.6056    2.2  24.0  111.1   1.3404   5.4 ------	UNKNOWN                       
230.2329  48.9718    2.6  22.2   25.6   0.9066   4.4 ------	UNKNOWN                       
277.6334  84.4120    2.6  30.2  -66.2   1.2259   4.5 ------	UNKNOWN                       
 65.0026  76.2630    3.4  40.8  -93.1   3.5059   3.4 ------	UNKNOWN