Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Sat Nov  1 22:16:56 EDT 2014
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger615672
======================================================================

  Trigger: 00615672      Segment: 000

  BAT Trigger Time: 435263140.672   [s; MET]
      Trigger Stop: 435263141.696   [s; MET]
               UTC: 2014-10-17T18:25:28.004480    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 93.6292819665991   Dec: -58.5544655852862  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    11.16
     Image Trigger?:     NO
     Rate S/N Ratio:     15.4596248337403  [ if not an image trigger ]
     Image S/N Ratio:    11.16

  Analysis Position:   [ source = BAT ]
    RA: 93.6292819665991   Dec: -58.5544655852862  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 93.6067956086993   Dec: -58.6051136285773  [deg; J2000]  
        { 06h 14m 25.6s , -58d 36' 18.4" }
         +/- 2.21007840622997 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.16222223178023 [arcmin] (formal 1-sigma fit error)
    SNR: 9.7973225609784
 
  Angular difference between the analysis and refined position is 3.119214 arcmin
 
  Partial Coding Fraction: 0.640625    [ including projection effects ]

  Duration
     T90: 55.8079999089241 +/- 2.86416207927003
        Measured from: 0.776000022888184
                   to: 56.5839999318123     [s; relative to TRIGTIME]
     T50: 4.02399998903275 +/- 0.286803016098481
        Measured from: 46.2879999876022
                   to: 50.311999976635     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 46.6040000319481     
                   to: 47.6040000319481     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -1.21999996900558     
                   to: 65.5760000348091     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.415875   1.992914   1.400935   0.272170
           0.053974   0.056082   0.048542   0.039290 [error]
 Peak      0.154044   0.303938   0.269562   0.063284
           0.008124   0.009727   0.009420   0.005915 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   66.796   -1.220   65.576
T90    55.808    0.776   56.584
T50     4.024   46.288   50.312
Peak    1.000   46.604   47.604
 
 
====== 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      -1.559    -0.064      0.064       -           -               -         4.94e-03     -1.74e-04          1.73e-04      52.010   57
CPL     -1.028    -0.264      0.280       94.083     -16.355        41.568      8.95e-03     -2.23e-03          3.21e-03      39.410   56
 
 
=== 1-s peak 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      -1.205     -0.063     0.063       -           -               -         5.32e-02     -2.00e-03          2.00e-03      69.580   57
CPL     -0.483     -0.273     0.290      117.254     -18.776        37.230      1.14e-01     -2.78e-02          3.93e-02      47.160   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   4.45e-07  7.89e-07  1.07e-06  3.00e-06  3.10e-06  5.30e-06   erg/cm2
      90%_error_low -2.82e-08 -2.98e-08 -4.85e-08 -2.90e-07 -1.17e-07 -3.24e-07   erg/cm2
      90%_error_hi   2.88e-08  2.97e-08  4.85e-08  3.10e-07  1.17e-07  3.40e-07   erg/cm2
Peak flux       PL   1.65e+00  1.98e+00  1.72e+00  2.55e+00  6.25e+00  7.91e+00   ph/cm2/s
      90%_error_low -1.16e-01 -8.71e-02 -7.41e-02 -2.22e-01 -2.42e-01 -3.12e-01   ph/cm2/s
      90%_error_hi   1.19e-01  8.67e-02  7.39e-02  2.35e-01  2.42e-01  3.13e-01   ph/cm2/s
 
Fluence        CPL   4.00e-07  8.22e-07  1.10e-06  1.47e-06  2.98e-06  3.80e-06   erg/cm2
      90%_error_low -3.48e-08 -3.43e-08 -5.33e-08 -3.98e-07 -1.32e-07 -4.17e-07   erg/cm2
      90%_error_hi   3.55e-08  3.47e-08  5.37e-08  5.79e-07  1.32e-07  5.86e-07   erg/cm2
Peak flux      CPL   1.39e+00  2.07e+00  1.87e+00  1.35e+00  6.08e+00  6.67e+00   ph/cm2/s
      90%_error_low -1.44e-01 -9.77e-02 -9.26e-02 -2.67e-01 -2.49e-01 -3.72e-01   ph/cm2/s
      90%_error_hi   1.48e-01  9.84e-02  9.36e-02  3.44e-01  2.50e-01  4.18e-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
   93.6068   -58.6051   0.0197    35.8953  -155.1040         0.5347323      9.797 TRIG_00615672                 
 
Foreground time interval of the image:
 -1.220  16.429 (delta_t =  17.649 [sec])
Background time interval of the image:
-239.672  -1.220 (delta_t = 238.452 [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   -1.220 sec. to   65.576 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.55949     ( -0.0638422   0.06365 )
Norm@50keV  : 4.93882E-03    ( -0.000173547   0.000173378 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.01 using 59 PHA bins.
# Reduced chi-squared =         0.9124 for     57 degrees of freedom 
# Null hypothesis probability =   6.623564e-01
 
Photon flux (15-150 keV)    in 66.8 sec: 0.626973 ( -0.023062  0.023115 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.10211e-06 ( -1.16609e-07  1.1701e-07 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -1.220 sec. to   65.576 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.02753     ( -0.263606   0.280397 )
Epeak [keV] : 94.0828      ( -16.3554 41.5679 )
Norm@50keV  : 8.95200E-03    ( -0.00223442   0.00320631 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          39.41 using 59 PHA bins.
# Reduced chi-squared =         0.7037 for     56 degrees of freedom 
# Null hypothesis probability =   9.546882e-01
 
Photon flux (15-150 keV)    in 66.8 sec: 0.605805 ( -0.025053  0.02511 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.97589e-06 ( -1.32104e-07  1.32081e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from   46.604 sec. to   47.604 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.20494     ( -0.0631408   0.0631831 )
Norm@50keV  : 5.32490E-02    ( -0.00199675   0.00199675 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          69.58 using 59 PHA bins.
# Reduced chi-squared =          1.221 for     57 degrees of freedom 
# Null hypothesis probability =   1.224860e-01
 
Photon flux (15-150 keV)    in 1 sec: 6.25476 ( -0.24155  0.24174 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.39548e-07 ( -2.22748e-08  2.23274e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   46.604 sec. to   47.604 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.482849     ( -0.272645   0.28975 )
Epeak [keV] : 117.254      ( -18.776 37.2298 )
Norm@50keV  : 0.114099    ( -0.0278407   0.0393437 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          47.16 using 59 PHA bins.
# Reduced chi-squared =         0.8421 for     56 degrees of freedom 
# Null hypothesis probability =   7.939335e-01
 
Photon flux (15-150 keV)    in 1 sec: 6.07691 ( -0.2494  0.24962 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.22264e-07 ( -2.3747e-08  2.36824e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 55.808 sec.
Hardness ratio (energy fluence ratio) = 1.34338326925

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

    S(15-50 keV)  = 1.2221509e-06
S(50-150 keV) = 1.7537661e-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 = -6.564982887578933E-01, IMY = 3.046800597565147E-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:
-239.672000 -1.220000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
291.7812 -39.2873    2.7  56.8  -29.4   4.7644   4.2 ------	UNKNOWN

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

    Time interval of the image:
-1.220000 16.428600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 84.7986 -34.3260    2.2  47.9  171.5   0.5441   5.3 ------	UNKNOWN                       
359.1092 -63.8022    2.2  11.5  -42.0   0.2164   5.1 ------	UNKNOWN                       
 93.6065 -58.6062    1.2  35.9 -155.1   0.5358   9.8 ------	UNKNOWN                       
111.6065 -78.0275    2.3  33.4 -119.2   0.3209   5.1 ------	UNKNOWN                       
120.7969 -44.3945    2.1  57.7 -153.4   1.3838   5.6 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
72.828600 962.460200
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.4758 -40.5504    1.3  31.8 -126.6   4.6205   8.9    2.4	Vela X-1                      
170.2679 -60.6246    2.9  36.6  -73.9   3.7941   4.0    1.4	Cen X-3                       
186.8363 -62.6765    8.1  41.9  -64.1   2.2373   1.4    7.5	GX 301-2                      
 99.7181 -33.7720    3.4  25.1  171.3   1.3304   3.4 ------	UNKNOWN                       
145.0484 -78.0674    2.8  25.6  -42.8   1.6020   4.2 ------	UNKNOWN                       
122.8509  -4.1136    2.8  59.0 -166.1  10.6223   4.1 ------	UNKNOWN