Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Mon Nov 23 16:58:22 EST 2015
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger662086
======================================================================

  Trigger: 00662086      Segment: 000

  BAT Trigger Time: 467797794.304   [s; MET]
      Trigger Stop: 467797795.328   [s; MET]
               UTC: 2015-10-29T07:49:38.965140    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 38.5287531705669   Dec: -35.3541474622592  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    10.6
     Image Trigger?:     NO
     Rate S/N Ratio:     20.2731349327133  [ if not an image trigger ]
     Image S/N Ratio:    10.6

  Analysis Position:   [ source = BAT ]
    RA: 38.5287531705669   Dec: -35.3541474622592  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 38.5420128259881   Dec: -35.3564300991215  [deg; J2000]  
        { 02h 34m 10.1s , -35d 21' 23.1" }
         +/- 1.90213237130505 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.921151629330411 [arcmin] (formal 1-sigma fit error)
    SNR: 12.1395626824018
 
  Angular difference between the analysis and refined position is 0.663155 arcmin
 
  Partial Coding Fraction: 0.4101562    [ including projection effects ]

  Duration
     T90: 8.95199996232986 +/- 3.9550777396026
        Measured from: -0.772000014781952
                   to: 8.17999994754791     [s; relative to TRIGTIME]
     T50: 3.71599996089935 +/- 1.4542517099395
        Measured from: 0.151999950408936
                   to: 3.86799991130829     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.15200001001358     
                   to: 0.84799998998642     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -1.10400003194809     
                   to: 12.1119999885559     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.303780   0.369010   0.123877  -0.005880
           0.031297   0.032523   0.027885   0.024223 [error]
 Peak      0.065857   0.089947   0.034876   0.004048
           0.009506   0.010522   0.008399   0.006525 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   13.216   -1.104   12.112
T90     8.952   -0.772    8.180
T50     3.716    0.152    3.868
Peak    1.000   -0.152    0.848
 
 
====== 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      -2.182    -0.208      0.194       -           -               -         3.52e-03     -5.36e-04          5.29e-04      71.980   57
CPL     -0.277    -1.027      1.308       33.950      -6.861         6.011      5.23e-02     -5.23e-02          3.03e-01      60.110   56
 
 
=== 1-s peak 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      -1.974     -0.254     0.237       -           -               -         1.17e-02     -2.11e-03          2.06e-03      76.510   57
CPL     -0.455     -1.264     1.788       39.910     -10.350        17.799      9.64e-02     -9.64e-02          1.16e+00      72.090   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   1.13e-07  1.38e-07  1.22e-07  1.84e-07  4.37e-07  5.57e-07   erg/cm2
      90%_error_low -1.56e-08 -1.58e-08 -2.42e-08 -6.15e-08 -5.78e-08 -9.65e-08   erg/cm2
      90%_error_hi   1.58e-08  1.57e-08  2.52e-08  7.90e-08  5.93e-08  1.10e-07   erg/cm2
Peak flux       PL   7.59e-01  5.78e-01  2.94e-01  2.15e-01  1.73e+00  1.85e+00   ph/cm2/s
      90%_error_low -1.46e-01 -8.39e-02 -6.68e-02 -7.93e-02 -2.51e-01 -2.70e-01   ph/cm2/s
      90%_error_hi   1.50e-01  8.39e-02  6.80e-02  1.02e-01  2.51e-01  2.71e-01   ph/cm2/s
 
Fluence        CPL   1.03e-07  1.70e-07  9.61e-08  1.28e-08  3.80e-07  3.81e-07   erg/cm2
      90%_error_low -1.76e-08 -2.26e-08 -3.36e-08 -1.04e-08 -5.27e-08 -5.39e-08   erg/cm2
      90%_error_hi   1.75e-08  2.31e-08  3.35e-08  3.44e-08  5.84e-08  6.50e-08   erg/cm2
Peak flux      CPL   6.89e-01  6.95e-01  2.72e-01  3.45e-02  1.69e+00  1.69e+00   ph/cm2/s
      90%_error_low -1.66e-01 -1.27e-01 -1.00e-01 -3.45e-02 -2.52e-01 -2.55e-01   ph/cm2/s
      90%_error_hi   1.66e-01  1.34e-01  8.76e-02  1.19e-01  2.53e-01  2.61e-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
   38.5420   -35.3564   0.0158    32.0150    49.2857         0.8251085     12.140 TRIG_00662086                 
 
Foreground time interval of the image:
 -1.104  12.112 (delta_t =  13.216 [sec])
Background time interval of the image:
-54.003  -1.104 (delta_t =  52.899 [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   -1.104 sec. to   12.112 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.18216     ( -0.207639   0.194026 )
Norm@50keV  : 3.52393E-03    ( -0.000536045   0.000528839 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          71.98 using 59 PHA bins.
# Reduced chi-squared =          1.263 for     57 degrees of freedom 
# Null hypothesis probability =   8.728264e-02
 
Photon flux (15-150 keV)    in 13.22 sec: 0.578036 ( -0.063079  0.063078 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.37e-07 ( -5.7815e-08  5.93307e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -1.104 sec. to   12.112 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.276867     ( -1.02874   1.30593 )
Epeak [keV] : 33.9501      ( -6.8623 6.00884 )
Norm@50keV  : 5.23044E-02    ( -0.0524819   0.303272 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.11 using 59 PHA bins.
# Reduced chi-squared =          1.073 for     56 degrees of freedom 
# Null hypothesis probability =   3.291846e-01
 
Photon flux (15-150 keV)    in 13.22 sec: 0.555641 ( -0.06255  0.062908 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.79867e-07 ( -5.27216e-08  5.84023e-08 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from   -0.152 sec. to    0.848 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.9742     ( -0.253846   0.236422 )
Norm@50keV  : 1.16718E-02    ( -0.00210836   0.00205827 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          76.51 using 59 PHA bins.
# Reduced chi-squared =          1.342 for     57 degrees of freedom 
# Null hypothesis probability =   4.329202e-02
 
Photon flux (15-150 keV)    in 1 sec: 1.73045 ( -0.25081  0.25081 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.07528e-07 ( -1.83454e-08  1.87332e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -0.152 sec. to    0.848 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.455493     ( -1.26405   1.78821 )
Epeak [keV] : 39.9104      ( -10.3493 17.7994 )
Norm@50keV  : 9.64254E-02    ( -0.096459   1.16267 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          72.09 using 59 PHA bins.
# Reduced chi-squared =          1.287 for     56 degrees of freedom 
# Null hypothesis probability =   7.262590e-02
 
Photon flux (15-150 keV)    in 1 sec: 1.68630 ( -0.25221  0.25308 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.49074e-08 ( -1.82525e-08  2.07731e-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 

    IMX = 4.078322001272018E-01, IMY = -4.739087831224246E-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:
-54.003410 -1.104000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.6100 -40.4780   11.0  40.8 -122.1   0.1933   1.0    5.9	Vela X-1                      
101.9357   4.2495    2.5  54.2  163.3   1.8107   4.5 ------	UNKNOWN                       
108.5814   2.4692    2.4  55.1  171.6   1.7782   4.8 ------	UNKNOWN                       
139.7426 -30.4574    2.2  49.0 -131.6   1.7683   5.2 ------	UNKNOWN                       
176.9637 -81.7526    2.4  45.8  -56.9   1.5610   4.7 ------	UNKNOWN                       
190.8687 -83.3108    2.4  46.9  -54.0   1.4674   4.7 ------	UNKNOWN

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

    Time interval of the image:
-1.104000 12.112000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.7207 -40.7104    6.3  40.8 -121.7  -0.1732  -1.8   12.8	Vela X-1                      
 38.5429 -35.3562    0.9  32.0   49.3   0.8332  12.3 ------	UNKNOWN                       
 83.4381  -8.6630    2.7  37.5  141.9   0.3207   4.2 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
69.196590 897.396580
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 90.7572  -9.0816    2.9  54.2  171.1   8.5558   3.9 ------	UNKNOWN                       
338.8996 -49.8723    3.8  44.9  -31.1   2.8977   3.1 ------	UNKNOWN                       
103.7148 -53.8949    2.3  48.0 -129.1  12.9803   5.1 ------	UNKNOWN