Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Sat Mar 19 20:54:19 EDT 2016
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger668543
======================================================================

  Trigger: 00668543      Segment: 000

  BAT Trigger Time: 472964728   [s; MET]
      Trigger Stop: 472964728.256   [s; MET]
               UTC: 2015-12-28T03:05:12.384680    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 214.003951052387   Dec: -17.6890004436844  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    6.53
     Image Trigger?:     NO
     Rate S/N Ratio:     36.8510515453766  [ if not an image trigger ]
     Image S/N Ratio:    6.53

  Analysis Position:   [ source = BAT ]
    RA: 214.003951052387   Dec: -17.6890004436844  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 214.019846236906   Dec: -17.6664070977249  [deg; J2000]  
        { 14h 16m 04.8s , -17d 39' 59.1" }
         +/- 1.7825050825542 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.670078010584032 [arcmin] (formal 1-sigma fit error)
    SNR: 13.3199619579118
 
  Angular difference between the analysis and refined position is 1.631976 arcmin
 
  Partial Coding Fraction: 1    [ including projection effects ]

  Duration
     T90: 0.275999963283539 +/- 0.039999997615816
        Measured from: -0.0279999971389771
                   to: 0.247999966144562     [s; relative to TRIGTIME]
     T50: 0.167999982833862 +/- 0.0432666533938203
        Measured from: 0.0199999809265137
                   to: 0.187999963760376     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.378000020980835     
                   to: 0.621999979019165     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.0360000133514404     
                   to: 0.276000022888184     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.012773   0.042010   0.045040   0.009667
           0.003802   0.004469   0.004718   0.004119 [error]
 Peak      0.016989   0.041701   0.041932   0.013461
           0.006355   0.006844   0.006473   0.005673 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    0.312   -0.036    0.276
T90     0.276   -0.028    0.248
T50     0.168    0.020    0.188
Peak    1.000   -0.378    0.622
 
 
====== 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      -0.824    -0.197      0.203       -           -               -         2.31e-02     -2.85e-03          2.84e-03      54.960   57
CPL      0.584    -0.969      1.233      101.966     -25.087        99.382      1.01e-01     -6.37e-02          2.51e-01      48.270   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      -0.927     -0.304     0.322       -           -               -         7.31e-03     -1.32e-03          1.31e-03      58.090   57
CPL     -0.323     -0.848     1.510      159.557    -159.557      -159.557      1.35e-02     -7.27e-03          4.31e-02      57.340   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   4.91e-09  1.37e-08  3.09e-08  1.87e-07  8.34e-08  2.36e-07   erg/cm2
      90%_error_low -1.12e-09 -2.01e-09 -4.13e-09 -4.97e-08 -1.12e-08 -5.26e-08   erg/cm2
      90%_error_hi   1.21e-09  1.98e-09  4.11e-09  6.13e-08  1.13e-08  6.30e-08   erg/cm2
Peak flux       PL   1.74e-01  2.47e-01  2.60e-01  5.04e-01  8.39e-01  1.19e+00   ph/cm2/s
      90%_error_low -6.06e-02 -5.69e-02 -4.95e-02 -1.80e-01 -1.52e-01 -2.29e-01   ph/cm2/s
      90%_error_hi   6.91e-02  5.56e-02  4.89e-02  2.40e-01  1.53e-01  2.47e-01   ph/cm2/s
 
Fluence        CPL   3.56e-09  1.52e-08  3.50e-08  4.13e-08  7.66e-08  9.50e-08   erg/cm2
      90%_error_low -1.30e-09 -2.45e-09 -5.10e-09 -2.38e-08 -1.26e-08 -2.59e-08   erg/cm2
      90%_error_hi   1.45e-09  2.53e-09  5.24e-09  6.41e-08  1.26e-08  6.29e-08   erg/cm2
Peak flux      CPL   1.48e-01  2.54e-01  2.78e-01  2.85e-01  8.19e-01  9.66e-01   ph/cm2/s
      90%_error_low -7.34e-02 -6.20e-02 -6.02e-02 -2.85e-01 -1.57e-01 -2.53e-01   ph/cm2/s
      90%_error_hi   8.36e-02  6.28e-02  6.27e-02  2.92e-01  1.58e-01  3.52e-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
      214.0198   -17.6664   0.0145    14.2243  -167.1569         0.1175101     13.320 TRIG_00668543                 
     
    Foreground time interval of the image:
     -0.036   0.276 (delta_t =   0.312 [sec])
    Background time interval of the image:
    -67.499  -0.036 (delta_t =  67.463 [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   -0.036 sec. to    0.276 sec.
     
    Spectral model in power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: -0.824371     ( -0.196566   0.203026 )
    Norm@50keV  : 2.31150E-02    ( -0.00284636   0.00283681 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          54.96 using 59 PHA bins.
    # Reduced chi-squared =         0.9642 for     57 degrees of freedom 
    # Null hypothesis probability =   5.519268e-01
     
    Photon flux (15-150 keV)    in 0.312 sec: 2.65468 ( -0.32399  0.3243 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 8.34363e-08 ( -1.11935e-08  1.12931e-08 ) ergs/cm2
     
    
    Cutoff power-law model
    Time interval is from   -0.036 sec. to    0.276 sec.
    Spectral model in the cutoff power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: 0.583979     ( -0.968552   1.23273 )
    Epeak [keV] : 101.966      ( -25.0876 99.3817 )
    Norm@50keV  : 0.101308    ( -0.0637016   0.250547 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          48.27 using 59 PHA bins.
    # Reduced chi-squared =         0.8619 for     56 degrees of freedom 
    # Null hypothesis probability =   7.591867e-01
     
    Photon flux (15-150 keV)    in 0.312 sec: 2.53317 ( -0.33594  0.33578 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 7.65729e-08 ( -1.26091e-08  1.26085e-08 ) ergs/cm2
     
    

    1-s peak spectrum fit

    Power-law model
    Time interval is from   -0.378 sec. to    0.622 sec.
     
    Spectral model in power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: -0.9271     ( -0.303625   0.322195 )
    Norm@50keV  : 7.30736E-03    ( -0.00132434   0.0013133 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          58.09 using 59 PHA bins.
    # Reduced chi-squared =          1.019 for     57 degrees of freedom 
    # Null hypothesis probability =   4.348806e-01
     
    Photon flux (15-150 keV)    in 1 sec: 0.839045 ( -0.152114  0.152736 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 8.1169e-08 ( -1.55409e-08  1.57012e-08 ) ergs/cm2
     
    
    Cutoff power-law model
    Time interval is from   -0.378 sec. to    0.622 sec.
    Spectral model in the cutoff power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: -0.322614     ( -0.848305   1.50958 )
    Epeak [keV] : 159.557      ( -159.558 -159.558 )
    Norm@50keV  : 1.35369E-02    ( -0.00727411   0.0430815 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          57.34 using 59 PHA bins.
    # Reduced chi-squared =          1.024 for     56 degrees of freedom 
    # Null hypothesis probability =   4.251674e-01
     
    Photon flux (15-150 keV)    in 1 sec: 0.818779 ( -0.157238  0.1577 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 7.86466e-08 ( -1.67182e-08  1.65848e-08 ) ergs/cm2
     
    

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot

    T90                                   = 0.276 sec.
    Hardness ratio (energy fluence ratio) = 2.30260724073
    

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

    S(15-50 keV)  = 1.8738299e-08
    S(50-150 keV) = 5.783482e-08
    

    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 = -2.471490745748556E-01, IMY = 5.634636703088051E-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:
    -67.499400 -0.036000
     
    # RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
    #  [deg]    [deg]    ['] [deg]  [deg]                   [']
    170.3029 -60.6036    2.7  38.8   17.4   0.7207   4.3    1.2	Cen X-3                       
    186.6402 -62.7296    3.6  34.8    5.8   0.4339   3.2    2.5	GX 301-2                      
    244.9837 -15.6536    1.1  37.0 -116.8   2.1989  11.0    0.8	Sco X-1                       
    255.9403 -37.8528    2.8  39.8  -77.6   1.6206   4.1    2.3	4U 1700-377                   
    256.4871 -36.4958   64.3  40.4  -79.7   0.0728   0.2    5.0	GX 349+2                      
    127.5362 -84.6796    2.7  58.5   -5.1   2.8525   4.3 ------	UNKNOWN                       
    245.4680  -7.6297    2.5  42.0 -126.8   1.1349   4.6 ------	UNKNOWN                       
    

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

    Time interval of the image:
    -0.036000 0.276000
     
    # RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
    #  [deg]    [deg]    ['] [deg]  [deg]                   [']
    170.3492 -60.8083    6.5  38.9   17.1   0.0253   1.8   11.2	Cen X-3                       
    186.3370 -62.7874   13.1  34.9    5.9   0.0103   0.9    8.8	GX 301-2                      
    245.0687 -15.5783    9.5  37.1 -116.9   0.0222   1.2    6.4	Sco X-1                       
    255.9342 -37.7347    7.6  39.8  -77.8   0.0525   1.5    7.0	4U 1700-377                   
    256.4194 -36.5033    7.5  40.3  -79.7  -0.0586  -1.5    4.9	GX 349+2                      
    213.0662  11.1716    2.3  42.2  176.2   0.0752   4.9 ------	UNKNOWN                       
    214.0198 -17.6664    0.9  14.2 -167.2   0.1175  13.3 ------	UNKNOWN                       
    232.9542   7.5313    2.2  45.2 -155.1   0.0828   5.3 ------	UNKNOWN                       
    

    Post-slew image of 15-350 keV band

    Time interval of the image:
    71.700600 201.100600
     
    # RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
    #  [deg]    [deg]    ['] [deg]  [deg]                   [']
    170.4564 -60.6016    3.6  39.1   16.8   0.7298   3.2    4.3	Cen X-3                       
    186.5787 -62.7509    1.9  35.2    5.3   1.1885   6.0    2.4	GX 301-2                      
    244.9642 -15.6200    0.7  37.2 -115.8   4.5009  15.8    1.5	Sco X-1                       
    255.9791 -37.8289    1.5  40.4  -76.9   4.5343   7.8    1.0	4U 1700-377                   
    256.4380 -36.3765    4.1  40.9  -79.1   1.8266   2.9    2.8	GX 349+2                      
    201.5287  12.8337    2.7  43.4  160.2   1.4430   4.3 ------	UNKNOWN                       
    155.2941 -82.7835    2.7  55.6   -4.3   2.3078   4.3 ------	UNKNOWN                       
    241.9469 -56.8839    2.5  35.8  -43.0   1.0169   4.6 ------	UNKNOWN