Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Tue Sep 29 20:07:32 EDT 2015
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger652603
======================================================================

  Trigger: 00652603      Segment: 000

  BAT Trigger Time: 461590607.936   [s; MET]
      Trigger Stop: 461590608.96   [s; MET]
               UTC: 2015-08-18T11:36:32.925720    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 230.446048357731   Dec: 68.3422608837458  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.04
     Image Trigger?:     NO
     Rate S/N Ratio:     12.9228479833201  [ if not an image trigger ]
     Image S/N Ratio:    8.04

  Analysis Position:   [ source = BAT ]
    RA: 230.446048357731   Dec: 68.3422608837458  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 230.340916903984   Dec: 68.3429974885415  [deg; J2000]  
        { 15h 21m 21.8s , +68d 20' 34.8" }
         +/- 1.24475611457742 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.431186498930022 [arcmin] (formal 1-sigma fit error)
    SNR: 22.2476278372372
 
  Angular difference between the analysis and refined position is 2.328379 arcmin
 
  Partial Coding Fraction: 0.3632812    [ including projection effects ]

  Duration
     T90: 143.055999934673 +/- 21.8026197181464
        Measured from: -9.32400000095367
                   to: 133.73199993372     [s; relative to TRIGTIME]
     T50: 42.3679999113083 +/- 7.07170700025133
        Measured from: 2.16000002622604
                   to: 44.5279999375343     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 1.56800001859665     
                   to: 2.56800001859665     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -25.255999982357     
                   to: 176.019999980927     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     2.460942   2.703435   1.669661   0.332793
           0.102662   0.103564   0.091519   0.081170 [error]
 Peak      0.095708   0.095713   0.060636   0.003202
           0.012028   0.012093   0.010674   0.008416 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  201.276  -25.256  176.020
T90   143.056   -9.324  133.732
T50    42.368    2.160   44.528
Peak    1.000    1.568    2.568
 
 
====== 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      -1.875    -0.092      0.091       -           -               -         2.30e-03     -1.17e-04          1.16e-04      55.520   57
CPL     -1.878    -0.089      0.264     9999.360    -9999.350      -9999.360      2.30e-03     -1.13e-04          8.05e-04      55.530   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      -1.978     -0.282     0.263       -           -               -         1.59e-02     -2.77e-03          2.67e-03      60.200   57
CPL     -1.922     -0.298     1.046       62.276      N/A           N/A         1.70e-02        N/A               N/A         60.190   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   8.42e-07  1.23e-06  1.34e-06  2.75e-06  4.26e-06  6.16e-06   erg/cm2
      90%_error_low -6.63e-08 -5.79e-08 -9.43e-08 -3.92e-07 -2.15e-07 -4.72e-07   erg/cm2
      90%_error_hi   6.80e-08  5.78e-08  9.44e-08  4.35e-07  2.16e-07  5.04e-07   erg/cm2
Peak flux       PL   1.03e+00  7.86e-01  3.99e-01  2.91e-01  2.35e+00  2.51e+00   ph/cm2/s
      90%_error_low -2.17e-01 -1.10e-01 -9.09e-02 -1.12e-01 -3.34e-01 -3.52e-01   ph/cm2/s
      90%_error_hi   2.28e-01  1.10e-01  9.13e-02  1.47e-01  3.35e-01  3.53e-01   ph/cm2/s
 
Fluence        CPL   8.51e-07  1.23e-06  1.34e-06  2.74e-06  4.29e-06  6.19e-06   erg/cm2
      90%_error_low    N/A    -5.66e-08 -5.91e-08    N/A    -3.32e-07 -1.03e-06   erg/cm2
      90%_error_hi     N/A     5.64e-08  9.70e-08    N/A     2.66e-07  4.84e-07   erg/cm2
Peak flux      CPL   1.03e+00  7.91e-01  4.00e-01  2.68e-01  2.35e+00  2.49e+00   ph/cm2/s
      90%_error_low     N/A   -1.34e-01 -9.10e-02 -2.68e-01 -3.46e-01 -4.28e-01   ph/cm2/s
      90%_error_hi      N/A    1.39e-01  9.45e-02  1.10e-01  3.30e-01  3.98e-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
  230.3409    68.3430   0.0087    43.9202  -149.4753         3.9481260     22.248 TRIG_00652603                 
 
Foreground time interval of the image:
-25.256  13.365 (delta_t =  38.621 [sec])
Background time interval of the image:
-65.635 -25.256 (delta_t =  40.379 [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  -25.256 sec. to  176.020 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.87493     ( -0.092134   0.090832 )
Norm@50keV  : 2.30203E-03    ( -0.000116681   0.000115771 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.52 using 59 PHA bins.
# Reduced chi-squared =         0.9741 for     57 degrees of freedom 
# Null hypothesis probability =   5.306093e-01
 
Photon flux (15-150 keV)    in 201.3 sec: 0.326925 ( -0.015936  0.016003 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.26074e-06 ( -2.1485e-07  2.1592e-07 ) ergs/cm2
    Cutoff power-law model
    Time interval is from  -25.256 sec. to  176.020 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.87793     ( -0.0903246   0.262829 )
Epeak [keV] : 9999.36      ( -9999.35 -9999.36 )
Norm@50keV  : 2.29974E-03    ( -0.000116415   0.000801632 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.53 using 59 PHA bins.
# Reduced chi-squared =         0.9916 for     56 degrees of freedom 
# Null hypothesis probability =   4.925135e-01
 
Photon flux (15-150 keV)    in 201.3 sec: 0.328568 ( -0.02363  0.019563 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.28523e-06 ( -3.32171e-07  2.65629e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from    1.568 sec. to    2.568 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.97822     ( -0.282286   0.263029 )
Norm@50keV  : 1.58532E-02    ( -0.00276815   0.00266936 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.20 using 59 PHA bins.
# Reduced chi-squared =          1.056 for     57 degrees of freedom 
# Null hypothesis probability =   3.608438e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.35464 ( -0.33445  0.33497 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.4607e-07 ( -2.37972e-08  2.42596e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from    1.568 sec. to    2.568 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.92171     ( -0.297982   1.04557 )
Epeak [keV] : 62.2764      (   )
Norm@50keV  : 1.70356E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.19 using 59 PHA bins.
# Reduced chi-squared =          1.075 for     56 degrees of freedom 
# Null hypothesis probability =   3.268249e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.34914 ( -0.34559  0.3295 ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 143.056 sec.
Hardness ratio (energy fluence ratio) = 1.09058621915

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

    S(15-50 keV)  = 2.0747195e-06
S(50-150 keV) = 2.1859708e-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 = -8.295371942011757E-01, IMY = 4.891173970783941E-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:
-65.635410 -25.256000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.6464  35.1880    4.1  48.7  139.2   1.0206   2.8    2.9	Cyg X-1                       
308.1259  41.0065   11.4  40.2  135.9   0.1841   1.0    3.3	Cyg X-3                       
326.3317  38.1535    0.0  35.0  113.9   0.0909   0.6   12.6	Cyg X-2                       
 18.2349  14.8234    2.5  50.0   37.1   1.5215   4.6 ------	UNKNOWN                       
 25.0579  40.8967    2.3  25.6   18.1   0.3499   5.1 ------	UNKNOWN                       
 53.7720  53.1684    0.8  26.2  -35.8   1.1574  15.3 ------	UNKNOWN                       
185.6082  83.7154    2.8  32.2 -127.6   0.3891   4.1 ------	UNKNOWN

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

    Time interval of the image:
-25.256000 13.364600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.6950  35.3150   11.7  48.6  139.3   0.4879   1.0    8.5	Cyg X-1                       
308.2968  40.9532    6.6  40.2  135.7   0.4259   1.7    8.5	Cyg X-3                       
326.1754  38.3176   23.2  35.0  114.2  -0.1051  -0.5    0.3	Cyg X-2                       
 25.9093  14.3877    2.7  51.5   27.7   1.8573   4.3 ------	UNKNOWN                       
263.8408  75.0804    3.1  32.3 -155.8   0.4280   3.7 ------	UNKNOWN                       
230.3409  68.3430    0.5  43.9 -149.5   3.9475  22.2 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
73.764600 122.564600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.3739  35.4386    3.9  35.5  147.2   0.3548   2.9    7.1	Her X-1                       
230.3302  68.3036    1.4   0.1 -124.2   0.5959   8.2 ------	UNKNOWN                       
221.5359  18.0965    2.4  50.6 -167.2   0.8546   4.8 ------	UNKNOWN                       
 86.2547  49.7908    2.9  58.9  -24.4   1.8798   4.0 ------	UNKNOWN