Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Fri Jun 26 00:18:20 EDT 2015
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger642018
======================================================================

  Trigger: 00642018      Segment: 000

  BAT Trigger Time: 454678951.872   [s; MET]
      Trigger Stop: 454678952.896   [s; MET]
               UTC: 2015-05-30T11:42:18.222320    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 327.523415997874   Dec: 57.4904208320749  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    9.11
     Image Trigger?:     NO
     Rate S/N Ratio:     23.7697286480094  [ if not an image trigger ]
     Image S/N Ratio:    9.11

  Analysis Position:   [ source = BAT ]
    RA: 327.523415997874   Dec: 57.4904208320749  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 327.511672646044   Dec: 57.5186072495788  [deg; J2000]  
        { 21h 50m 02.8s , +57d 31' 07.0" }
         +/- 1.20346359197235 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.401392262154241 [arcmin] (formal 1-sigma fit error)
    SNR: 23.3460900749071
 
  Angular difference between the analysis and refined position is 1.733031 arcmin
 
  Partial Coding Fraction: 0.1757812    [ including projection effects ]

  Duration
     T90: 6.89600002765656 +/- 0.817253912009944
        Measured from: -3.95199996232986
                   to: 2.94400006532669     [s; relative to TRIGTIME]
     T50: 3.0560000538826 +/- 0.572433362789055
        Measured from: -1.61599999666214
                   to: 1.44000005722046     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.467999994754791     
                   to: 1.46799999475479     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -4.783999979496     
                   to: 3.28000003099442     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.612667   0.896375   0.842826   0.239208
           0.052958   0.058947   0.051920   0.039808 [error]
 Peak      0.095462   0.155519   0.154298   0.078120
           0.018679   0.022651   0.020814   0.015981 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    8.064   -4.784    3.280
T90     6.896   -3.952    2.944
T50     3.056   -1.616    1.440
Peak    1.000    0.468    1.468
 
 
====== 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      -1.488    -0.113      0.113       -           -               -         2.31e-02     -1.54e-03          1.54e-03      69.790   57
CPL     -1.109    -0.417      0.471      128.415     -45.438      -128.415      3.48e-02     -1.23e-02          2.23e-02      67.510   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      -1.237     -0.231     0.237       -           -               -         3.45e-02     -4.65e-03          4.64e-03      43.490   57
CPL     -1.229     -0.235     0.235     9998.890    -9998.890      -9998.890      3.46e-02     -3.46e-02          2.99e-02      43.500   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   2.35e-07  4.35e-07  6.21e-07  1.87e-06  1.77e-06  3.16e-06   erg/cm2
      90%_error_low -2.77e-08 -3.21e-08 -5.03e-08 -3.07e-07 -1.25e-07 -3.46e-07   erg/cm2
      90%_error_hi   2.88e-08  3.19e-08  5.00e-08  3.44e-07  1.25e-07  3.73e-07   erg/cm2
Peak flux       PL   1.10e+00  1.30e+00  1.10e+00  1.59e+00  4.07e+00  5.09e+00   ph/cm2/s
      90%_error_low -2.85e-01 -2.17e-01 -1.65e-01 -4.53e-01 -5.81e-01 -6.93e-01   ph/cm2/s
      90%_error_hi   3.09e-01  2.11e-01  1.63e-01  5.51e-01  5.82e-01  6.98e-01   ph/cm2/s
 
Fluence        CPL   2.17e-07  4.50e-07  6.46e-07  1.16e-06  1.74e-06  2.48e-06   erg/cm2
      90%_error_low -3.40e-08 -3.63e-08 -5.82e-08 -4.60e-07 -1.30e-07 -4.70e-07   erg/cm2
      90%_error_hi   3.48e-08  3.71e-08  5.94e-08  7.53e-07  1.29e-07  8.15e-07   erg/cm2
Peak flux      CPL   1.12e+00  1.30e+00  1.10e+00  1.70e+00  4.09e+00  5.11e+00   ph/cm2/s
      90%_error_low     N/A   -2.20e-01 -1.61e-01 -1.70e+00 -6.41e-01 -9.39e-01   ph/cm2/s
      90%_error_hi      N/A    2.10e-01  1.75e-01  9.98e-01  6.32e-01  6.68e-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
  327.5117    57.5186   0.0083    48.4398   166.0101         2.8673145     23.346 TRIG_00642018                 
 
Foreground time interval of the image:
 -4.784   3.280 (delta_t =   8.064 [sec])
Background time interval of the image:
-646.671 -629.213 (delta_t =  17.459 [sec])
-239.872  -4.784 (delta_t = 235.088 [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   -4.784 sec. to    3.280 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.48821     ( -0.112855   0.112611 )
Norm@50keV  : 2.30904E-02    ( -0.00153737   0.00153632 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          69.79 using 59 PHA bins.
# Reduced chi-squared =          1.224 for     57 degrees of freedom 
# Null hypothesis probability =   1.190037e-01
 
Photon flux (15-150 keV)    in 8.064 sec: 2.87362 ( -0.20316  0.20369 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.77007e-06 ( -1.246e-07  1.24977e-07 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -4.784 sec. to    3.280 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.10945     ( -0.417446   0.471439 )
Epeak [keV] : 128.415      ( -45.4376 -128.415 )
Norm@50keV  : 3.48431E-02    ( -0.012308   0.02228 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          67.51 using 59 PHA bins.
# Reduced chi-squared =          1.206 for     56 degrees of freedom 
# Null hypothesis probability =   1.394467e-01
 
Photon flux (15-150 keV)    in 8.064 sec: 2.82580 ( -0.2102  0.21063 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.74369e-06 ( -1.29557e-07  1.29274e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from    0.468 sec. to    1.468 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.23742     ( -0.230639   0.236577 )
Norm@50keV  : 3.45116E-02    ( -0.00464527   0.00463735 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          43.49 using 59 PHA bins.
# Reduced chi-squared =         0.7630 for     57 degrees of freedom 
# Null hypothesis probability =   9.062566e-01
 
Photon flux (15-150 keV)    in 1 sec: 4.07362 ( -0.58054  0.58217 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.46585e-07 ( -4.92541e-08  4.93647e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from    0.468 sec. to    1.468 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.22937     ( -0.231715   0.238654 )
Epeak [keV] : 9998.89      ( -9999.36 -9999.36 )
Norm@50keV  : 3.46024E-02    ( -0.0346706   0.029869 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          43.50 using 59 PHA bins.
# Reduced chi-squared =         0.7768 for     56 degrees of freedom 
# Null hypothesis probability =   8.883861e-01
 
Photon flux (15-150 keV)    in 1 sec: 4.08697 ( -0.64118  0.63191 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.48257e-07 ( 0  0 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 6.896 sec.
Hardness ratio (energy fluence ratio) = 1.42587021443

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

    S(15-50 keV)  = 6.703593e-07
S(50-150 keV) = 1.0997264e-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 = -1.094449698655726E+00, IMY = -2.726725527081504E-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:
-646.671410 -629.212800
-239.872000 -4.784000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
326.0527  38.4208    5.5  44.0  140.1   1.5224   2.1    8.2	Cyg X-2                       
334.8341  24.5584    2.7  36.3  118.7   2.0372   4.3 ------	UNKNOWN                       
330.4102  32.2947    2.2  40.0  131.4   3.3048   5.4 ------	UNKNOWN                       
 62.6788  61.5056    2.8  50.7 -135.0   4.5915   4.2 ------	UNKNOWN

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

    Time interval of the image:
-4.784000 3.280000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
326.2943  38.4061    7.8  43.9  140.1  -0.2237  -1.5    7.7	Cyg X-2                       
327.5117  57.5186    0.5  48.4  166.0   2.8676  23.3 ------	UNKNOWN                       
 35.3120  73.0442    2.5  51.6 -154.7   0.4758   4.6 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
86.228590 562.428600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.5824  35.1939    0.4  29.1   72.0  17.7159  27.0    0.6	Cyg X-1                       
308.1259  40.9812    2.0  20.6   65.3   2.6646   5.8    1.9	Cyg X-3                       
326.0879  38.4443    4.0  19.1   23.4   1.1313   2.9    8.3	Cyg X-2                       
342.6599  39.7349    2.7  20.3  -15.5   1.5107   4.2 ------	UNKNOWN                       
  5.0091  50.9903    3.2  22.5  -69.6   1.7873   3.6 ------	UNKNOWN                       
 30.9455  67.1739    3.5  29.5 -115.2   1.6507   3.3 ------	UNKNOWN                       
 78.5962  65.3860    3.6  46.7 -127.8   6.5633   3.2 ------	UNKNOWN