Analysis Summary

Notes:

Special note: Due to the low partial coding fraction, the refined position is found using the DETECTION mask. Therefore, the refined position and the mask shadow pattern shown here are from analyses with DETECTION mask, everything else uses the FLUX mask.

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Sun May 10 16:50:59 EDT 2015
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger557508
======================================================================

  Trigger: 00557508      Segment: 000

  BAT Trigger Time: 392168512.704   [s; MET]
      Trigger Stop: 392168513.728   [s; MET]
               UTC: 2013-06-05T23:41:42.063620    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 134.523928520347   Dec: -33.4893087735771  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.75
     Image Trigger?:     NO
     Rate S/N Ratio:     17.1172427686237  [ if not an image trigger ]
     Image S/N Ratio:    7.75

  Analysis Position:   [ source = BAT ]
    RA: 134.523928520347   Dec: -33.4893087735771  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA:    Dec:   [deg; J2000]  
        { 00h 00m 00.0s , +00d 00' 00.0" }
         +/- -inf [arcmin] (estimated 90% radius based on SNR)
         +/- 0 [arcmin] (formal 1-sigma fit error)
    SNR: 
 
  Angular difference between the analysis and refined position is -3252.673149 arcmin
 
  Partial Coding Fraction: 0.05224609    [ including projection effects ]

  Duration
     T90: 10.1759999990463 +/- 3.20063996959449
        Measured from: -1.24000000953674
                   to: 8.93599998950958     [s; relative to TRIGTIME]
     T50: 4.1599999666214 +/- 1.3977811395475
        Measured from: 0.424000024795532
                   to: 4.58399999141693     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.107999980449677     
                   to: 0.892000019550323     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -1.81599998474121     
                   to: 12.0080000162125     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.832758   1.444929   0.946842   0.245504
           0.112567   0.124600   0.111778   0.093578 [error]
 Peak      0.101369   0.152158   0.299368   0.058046
           0.032096   0.034637   0.041914   0.031456 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   13.824   -1.816   12.008
T90    10.176   -1.240    8.936
T50     4.160    0.424    4.584
Peak    1.000   -0.108    0.892
 
 
====== 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: 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      -1.620    -0.175      0.171       -           -               -         1.77e-02     -1.90e-03          1.88e-03      73.180   57
CPL     -0.926    -0.702      0.837       75.250     -19.925       923.463      4.05e-02     -2.26e-02          6.81e-02      70.350   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      -1.195     -0.355     0.337       -           -               -         3.29e-02     -7.20e-03          7.16e-03      66.210   57
CPL      0.869     -3.330     8.647      105.632     -26.480      -105.632      1.55e-01     -1.55e-01          3.50e+01      64.470   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   3.49e-07  5.97e-07  7.76e-07  2.05e-06  2.28e-06  3.77e-06   erg/cm2
      90%_error_low -5.61e-08 -6.24e-08 -1.08e-07 -5.35e-07 -2.59e-07 -6.41e-07   erg/cm2
      90%_error_hi   5.83e-08  6.22e-08  1.08e-07  6.43e-07  2.62e-07  7.24e-07   erg/cm2
Peak flux       PL   1.01e+00  1.22e+00  1.07e+00  1.59e+00  3.86e+00  4.89e+00   ph/cm2/s
      90%_error_low -3.82e-01 -3.23e-01 -2.50e-01 -6.62e-01 -8.82e-01 -1.07e+00   ph/cm2/s
      90%_error_hi   4.53e-01  3.19e-01  2.45e-01  8.02e-01  8.88e-01  1.08e+00   ph/cm2/s
 
Fluence        CPL   3.15e-07  6.44e-07  8.06e-07  7.97e-07  2.18e-06  2.56e-06   erg/cm2
      90%_error_low -6.62e-08 -7.90e-08 -1.20e-07 -4.68e-07 -2.83e-07 -5.48e-07   erg/cm2
      90%_error_hi   6.75e-08  8.21e-08  1.22e-07  1.28e-06  2.85e-07  1.27e-06   erg/cm2
Peak flux      CPL   3.74e-01  1.05e+00  1.47e+00  8.84e-01  3.49e+00  3.83e+00   ph/cm2/s
      90%_error_low -3.74e-01 -1.05e+00 -5.39e-01 -5.48e-01 -1.05e+00 -1.34e+00   ph/cm2/s
      90%_error_hi   1.19e+00  4.60e-01  7.56e-01  1.10e+00  1.04e+00  1.64e+00   ph/cm2/s
 
======================================================================
  • Special notes of this burst




    Image

    Pre-slew 15.0-350.0 keV image (Event data; DETECTION mask)

    #   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  134.5339   -33.4817   0.0128    42.7103  -110.5366         3.6670870     15.072 TRIG_00557508                 
 
Foreground time interval of the image:
 -1.544  16.597 (delta_t =  18.141 [sec])
Background time interval of the image:
-196.003  -1.544 (delta_t = 194.459 [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   -1.816 sec. to   12.008 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.61968     ( -0.174721   0.170881 )
Norm@50keV  : 1.76857E-02    ( -0.00189795   0.00188229 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          73.18 using 59 PHA bins.
# Reduced chi-squared =          1.284 for     57 degrees of freedom 
# Null hypothesis probability =   7.315466e-02
 
Photon flux (15-150 keV)    in 13.82 sec: 2.28685 ( -0.23739  0.23773 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.28085e-06 ( -2.59472e-07  2.61747e-07 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -1.816 sec. to   12.008 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.925905     ( -0.701628   0.837211 )
Epeak [keV] : 75.2498      ( -19.9254 923.463 )
Norm@50keV  : 4.05099E-02    ( -0.0226433   0.0680613 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          70.35 using 59 PHA bins.
# Reduced chi-squared =          1.256 for     56 degrees of freedom 
# Null hypothesis probability =   9.404477e-02
 
Photon flux (15-150 keV)    in 13.82 sec: 2.22802 ( -0.24546  0.24533 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.17535e-06 ( -2.83103e-07  2.84552e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from   -0.108 sec. to    0.892 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.19547     ( -0.355394   0.337487 )
Norm@50keV  : 3.28733E-02    ( -0.00719765   0.00716341 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          66.21 using 59 PHA bins.
# Reduced chi-squared =          1.162 for     57 degrees of freedom 
# Null hypothesis probability =   1.889517e-01
 
Photon flux (15-150 keV)    in 1 sec: 3.85623 ( -0.88228  0.88776 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.3398e-07 ( -7.53672e-08  7.51393e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -0.108 sec. to    0.892 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.868786     ( -3.37889   8.59831 )
Epeak [keV] : 105.632      ( -25.5079 -104.66 )
Norm@50keV  : 0.154904    ( -0.168349   34.9763 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.47 using 59 PHA bins.
# Reduced chi-squared =          1.151 for     56 degrees of freedom 
# Null hypothesis probability =   2.046498e-01
 
Photon flux (15-150 keV)    in 1 sec: 3.49174 ( -1.04968  1.03566 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.60969e-07 ( -8.29016e-08  8.46257e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = N/A sec.
Hardness ratio (energy fluence ratio) = N/A

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

    S(15-50 keV)  = N/A
S(50-150 keV) = N/A

    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 (with DETECTION mask) 

    IMX = -3.238303501896034E-01, IMY = 8.644403243361053E-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:
-196.003400 -1.816000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5868 -40.5645    3.9  41.0 -120.9   1.4422   2.9    2.7	Vela X-1                      
170.4718 -60.6596    7.4  31.1 -169.1   0.3255   1.5    5.1	Cen X-3                       
186.8793 -62.6817   18.4  31.5  175.4  -0.1440  -0.6    8.1	GX 301-2                      
210.2346 -54.8845    3.1  29.4  147.3   0.9633   3.7 ------	UNKNOWN                       
155.7084  -4.1392    2.8  39.0  -55.5   1.5331   4.1 ------	UNKNOWN

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

    Time interval of the image:
-1.816000 12.008000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.4463 -40.3690    5.4  41.1 -120.6  -0.3836  -2.1   11.8	Vela X-1                      
170.0502 -60.6122    6.8  31.1 -168.7   0.1016   1.7    7.8	Cen X-3                       
186.5881 -62.7885    4.3  31.6  175.7  -0.1622  -2.7    2.2	GX 301-2                      
213.1119   2.4936    2.1  42.7   39.5   0.7024   5.5 ------	UNKNOWN                       
215.2905 -16.1913    2.2  31.0   64.4   0.4457   5.3 ------	UNKNOWN                       
224.9804 -47.8314    2.7  34.1  127.1   0.3765   4.3 ------	UNKNOWN                       
125.9260 -60.2450    2.4  48.3 -148.5   0.5825   4.8 ------	UNKNOWN                       
134.5383 -33.4725    0.9  42.7 -110.5   4.0662  13.5 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
76.596590 302.356000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.6125 -40.7242    4.7   7.3  138.4   0.5251   2.4   10.9	Vela X-1                      
170.3539 -60.7028   11.7  35.7  115.3   0.4860   1.0    4.9	Cen X-3                       
138.3952 -63.7793    2.6  30.4  141.3   1.2839   4.4 ------	UNKNOWN                       
146.6079  -4.5191    2.9  31.1  -11.6   0.9424   4.0 ------	UNKNOWN                       
157.3279  19.3950    2.7  57.2   -9.6   4.2933   4.2 ------	UNKNOWN                       
 60.2060 -41.3116    2.8  57.8 -156.6   4.7511   4.1 ------	UNKNOWN                       
 87.0374 -20.2945    2.6  44.0 -120.4   4.2593   4.5 ------	UNKNOWN