Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Tue Sep 29 19:30:33 EDT 2015
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger655262
======================================================================

  Trigger: 00655262      Segment: 000

  BAT Trigger Time: 463689636.608   [s; MET]
      Trigger Stop: 463689637.12   [s; MET]
               UTC: 2015-09-11T18:40:21.487220    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 67.4241761992931   Dec: 5.74277762478309  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.46
     Image Trigger?:     NO
     Rate S/N Ratio:     15.2315462117278  [ if not an image trigger ]
     Image S/N Ratio:    7.46

  Analysis Position:   [ source = BAT ]
    RA: 67.4241761992931   Dec: 5.74277762478309  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 67.4275965149776   Dec: 5.73019951337366  [deg; J2000]  
        { 04h 29m 42.6s , +05d 43' 48.7" }
         +/- 0.623987223661816 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.201897944531603 [arcmin] (formal 1-sigma fit error)
    SNR: 59.6656706451926
 
  Angular difference between the analysis and refined position is 0.781822 arcmin
 
  Partial Coding Fraction: 0.6796875    [ including projection effects ]

  Duration
     T90: 7.13599991798401 +/- 0.599746645925605
        Measured from: 0.368000030517578
                   to: 7.50399994850159     [s; relative to TRIGTIME]
     T50: 3.59199994802475 +/- 0.176816265574462
        Measured from: 2.12000000476837
                   to: 5.71199995279312     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 3.89600002765656     
                   to: 4.89600002765656     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -1.0359999537468     
                   to: 9.61200004816055     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.187602   1.608984   0.848391   0.113540
           0.029547   0.031849   0.025906   0.019755 [error]
 Peak      0.185932   0.229863   0.152930   0.025838
           0.009993   0.011270   0.009270   0.006194 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   10.648   -1.036    9.612
T90     7.136    0.368    7.504
T50     3.592    2.120    5.712
Peak    1.000    3.896    4.896
 
 
====== 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      -1.929    -0.052      0.052       -           -               -         2.26e-02     -6.74e-04          6.73e-04      97.430   57
CPL     -1.018    -0.249      0.264       51.573      -3.441         4.143      6.64e-02     -1.66e-02          2.39e-02      52.120   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      -1.726     -0.095     0.093       -           -               -         3.85e-02     -2.26e-03          2.25e-03      55.120   57
CPL     -1.058     -0.395     0.436       67.225     -11.056        30.346      8.64e-02     -3.23e-02          5.88e-02      46.280   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   4.61e-07  6.53e-07  6.86e-07  1.33e-06  2.22e-06  3.13e-06   erg/cm2
      90%_error_low -2.24e-08 -1.93e-08 -2.70e-08 -1.07e-07 -6.52e-08 -1.31e-07   erg/cm2
      90%_error_hi   2.27e-08  1.93e-08  2.70e-08  1.13e-07  6.53e-08  1.34e-07   erg/cm2
Peak flux       PL   1.97e+00  1.73e+00  1.05e+00  9.56e-01  5.16e+00  5.71e+00   ph/cm2/s
      90%_error_low -1.73e-01 -9.87e-02 -7.80e-02 -1.34e-01 -2.91e-01 -3.14e-01   ph/cm2/s
      90%_error_hi   1.77e-01  9.84e-02  7.77e-02  1.46e-01  2.91e-01  3.14e-01   ph/cm2/s
 
Fluence        CPL   3.94e-07  7.04e-07  7.00e-07  4.31e-07  2.07e-06  2.23e-06   erg/cm2
      90%_error_low -2.74e-08 -2.38e-08 -3.04e-08 -9.95e-08 -7.51e-08 -1.25e-07   erg/cm2
      90%_error_hi   2.78e-08  2.40e-08  3.04e-08  1.32e-07  7.53e-08  1.50e-07   erg/cm2
Peak flux      CPL   1.77e+00  1.85e+00  1.09e+00  4.67e-01  5.02e+00  5.19e+00   ph/cm2/s
      90%_error_low -2.05e-01 -1.22e-01 -8.72e-02 -1.58e-01 -3.02e-01 -3.48e-01   ph/cm2/s
      90%_error_hi   2.08e-01  1.25e-01  8.80e-02  2.38e-01  3.02e-01  3.74e-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
   67.4276     5.7302   0.0032    29.2594   -46.4609         3.8663000     59.666 TRIG_00655262                 
 
Foreground time interval of the image:
 -1.036   9.612 (delta_t =  10.648 [sec])
Background time interval of the image:
-331.107 -313.753 (delta_t =  17.355 [sec])
-239.608  -1.036 (delta_t = 238.572 [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   -1.036 sec. to    9.612 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.92945     ( -0.0520372   0.0517137 )
Norm@50keV  : 2.26401E-02    ( -0.000674447   0.000672961 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          97.43 using 59 PHA bins.
# Reduced chi-squared =          1.709 for     57 degrees of freedom 
# Null hypothesis probability =   6.832098e-04
 
Photon flux (15-150 keV)    in 10.65 sec: 3.29070 ( -0.1027  0.10301 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.2181e-06 ( -6.52178e-08  6.53432e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -1.036 sec. to    9.612 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.01793     ( -0.248599   0.263651 )
Epeak [keV] : 51.5727      ( -3.44079 4.14332 )
Norm@50keV  : 6.63659E-02    ( -0.0165991   0.0238766 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.12 using 59 PHA bins.
# Reduced chi-squared =         0.9307 for     56 degrees of freedom 
# Null hypothesis probability =   6.225730e-01
 
Photon flux (15-150 keV)    in 10.65 sec: 3.09750 ( -0.11239  0.11289 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.06595e-06 ( -7.5096e-08  7.53101e-08 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from    3.896 sec. to    4.896 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.72633     ( -0.0946146   0.0933311 )
Norm@50keV  : 3.84703E-02    ( -0.00225833   0.00224608 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.12 using 59 PHA bins.
# Reduced chi-squared =         0.9671 for     57 degrees of freedom 
# Null hypothesis probability =   5.457963e-01
 
Photon flux (15-150 keV)    in 1 sec: 5.15742 ( -0.29115  0.29145 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.55558e-07 ( -2.16322e-08  2.17361e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from    3.896 sec. to    4.896 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.0584     ( -0.395239   0.43621 )
Epeak [keV] : 67.2247      ( -11.0557 30.3456 )
Norm@50keV  : 8.63758E-02    ( -0.0322756   0.0588398 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          46.28 using 59 PHA bins.
# Reduced chi-squared =         0.8264 for     56 degrees of freedom 
# Null hypothesis probability =   8.195576e-01
 
Photon flux (15-150 keV)    in 1 sec: 5.02321 ( -0.30188  0.30183 ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 7.136 sec.
Hardness ratio (energy fluence ratio) = 0.995199034749

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

    S(15-50 keV)  = 1.097829e-06
S(50-150 keV) = 9.681139e-07

    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 = 3.859220204291111E-01, IMY = 4.061216438628479E-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:
-331.107400 -313.752700
-239.608000 -1.036000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
  0.1199   6.9115    3.0  39.8  105.7   3.3842   3.9  414.8	UNKNOWN                       
 53.7371  53.1658    1.1  38.2 -141.4   3.3977  10.6 ------	UNKNOWN                       
 52.8183  69.0330    2.8  53.1 -149.2   3.1505   4.1 ------	UNKNOWN                       
 75.6458  56.1866    2.9  48.0 -129.0   3.6996   3.9 ------	UNKNOWN                       
 77.0078  52.9546    2.4  46.6 -124.9   4.6806   4.8 ------	UNKNOWN

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

    Time interval of the image:
-1.036000 9.612000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 48.4036 -36.9370    2.4  54.2   16.3   1.2323   4.8 ------	UNKNOWN                       
 27.8045  30.0898    3.1  17.3  168.2   0.1918   3.7 ------	UNKNOWN                       
 67.4276   5.7302    0.2  29.3  -46.5   3.8662  59.7 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
63.892600 962.455100
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6362  22.0113    0.2  22.6 -131.6  36.8914  54.6    0.3	Crab                          
 59.3210 -46.4914    2.7  52.7   13.0  12.0267   4.2 ------	UNKNOWN                       
 53.7760  53.1985    2.3  48.8  175.2   7.7951   5.1 ------	UNKNOWN                       
106.2357  50.6385    6.1  55.3 -145.1   7.8084   1.9 ------	UNKNOWN                       
108.8260 -17.1360    3.6  46.9  -54.0   8.9086   3.2 ------	UNKNOWN