Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Tue Jun 23 00:22:25 EDT 2015
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger294645
======================================================================

  Trigger: 00294645      Segment: 000

  BAT Trigger Time: 214389464   [s; MET]
      Trigger Stop: 214389840   [s; MET]
               UTC: 2007-10-18T08:37:41.700440    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 164.67599151863   Dec: 53.8304941752699  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     NO    [ by BAT flight software ]
     Image S/N Ratio:    7.55
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    7.55

  Analysis Position:   [ source = BAT ]
    RA: 164.67599151863   Dec: 53.8304941752699  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 164.676   Dec: 53.8305  [deg; J2000]
        { 10h 58m 42.2s , +53d 49' 49.8" }
        +/- 2.70010687777 [arcmin] (estimated 90% radius based on SNR)
    SNR: 7.36065886316
 
 
  Angular difference between the analysis and refined position is 0.000461 arcmin
 
  Partial Coding Fraction: 0.9765625    [ including projection effects ]

  Duration
     T90: 273.567999988794 +/- 40.0731999316647
        Measured from: 132.196000009775
                   to: 405.763999998569     [s; relative to TRIGTIME]
     T50: 153.916000008583 +/- 64.4150747940504
        Measured from: 200.40000000596
                   to: 354.316000014544     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 301.655999988317     
                   to: 302.655999988317     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 119.784000009298     
                   to: 415.956000000238     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.528745   0.605148   0.515492   0.121955
           0.077773   0.080861   0.071164   0.062127 [error]
 Peak      0.005222   0.014783   0.014648  -0.000973
           0.004534   0.004775   0.004211   0.003745 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  296.172  119.784  415.956
T90   273.568  132.196  405.764
T50   153.916  200.400  354.316
Peak    1.000  301.656  302.656
 
 
====== 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      -1.563    -0.252      0.247       -           -               -         3.74e-04     -5.48e-05          5.37e-05      70.070   57
CPL     -1.569    -0.246      0.302     9999.180    -9999.180      -9999.180      3.74e-04     -5.45e-05          3.68e-04      70.080   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      -1.173     -0.586     0.624       -           -               -         2.47e-03     -8.98e-04          8.98e-04      54.610   57
CPL      2.630     -3.715    -2.630       61.203     -15.346       288.959      1.70e-01     -1.70e-01          5.67e+02      51.640   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   1.50e-07  2.65e-07  3.59e-07  1.00e-06  1.04e-06  1.78e-06   erg/cm2
      90%_error_low -3.25e-08 -3.63e-08 -7.10e-08 -3.62e-07 -1.66e-07 -4.32e-07   erg/cm2
      90%_error_hi   3.38e-08  3.61e-08  7.07e-08  4.84e-07  1.69e-07  5.33e-07   erg/cm2
Peak flux       PL   7.43e-02  9.08e-02  8.05e-02  1.23e-01  2.88e-01  3.69e-01   ph/cm2/s
      90%_error_low -4.30e-02 -3.84e-02 -3.32e-02 -7.73e-02 -1.07e-01 -1.39e-01   ph/cm2/s
      90%_error_hi   5.29e-02  3.76e-02  3.29e-02  1.35e-01  1.08e-01  1.47e-01   ph/cm2/s
 
Fluence        CPL   1.52e-07  2.61e-07  3.57e-07  9.97e-07  1.06e-06  1.96e-06   erg/cm2
      90%_error_low -4.07e-08    N/A    -6.89e-08    N/A    -1.87e-07 -8.52e-07   erg/cm2
      90%_error_hi   3.80e-08    N/A     7.28e-08    N/A     1.46e-07  1.24e-07   erg/cm2
Peak flux      CPL   2.92e-02  1.12e-01  9.46e-02  8.39e-03  2.44e-01  2.44e-01   ph/cm2/s
      90%_error_low -2.92e-02 -6.12e-02     N/A   -8.39e-03 -1.05e-01 -1.07e-01   ph/cm2/s
      90%_error_hi   6.66e-02  5.38e-02     N/A    1.04e-01  1.16e-01  1.31e-01   ph/cm2/s
 
======================================================================
  • Special notes of this burst




    Image

    Pre-slew 15.0-50.0 keV image (Event data)

    #RAcent DECcent POSerr Theta  Phi  Peak_Cts  SNR Name
164.676 53.831 0.000 19.909 -178.501 1.059 7.361 TRIG_00294645
 
Image time interval: 0.000 to 376.000 [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  119.784 sec. to  415.956 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.56343     ( -0.252157   0.247072 )
Norm@50keV  : 3.73886E-04    ( -5.48472e-05   5.37305e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          70.07 using 59 PHA bins.
# Reduced chi-squared =          1.229 for     57 degrees of freedom 
# Null hypothesis probability =   1.144676e-01
 
Photon flux (15-150 keV)    in 296.2 sec: 4.75192E-02 ( -0.0064084  0.0064143 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.04075e-06 ( -1.65752e-07  1.68947e-07 ) ergs/cm2
    Cutoff power-law model
    Time interval is from  119.784 sec. to  415.956 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.56926     ( -0.246796   0.301753 )
Epeak [keV] : 9999.18      ( -9999.33 -9999.33 )
Norm@50keV  : 3.74091E-04    ( -5.46663e-05   0.000367887 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          70.08 using 59 PHA bins.
# Reduced chi-squared =          1.251 for     56 degrees of freedom 
# Null hypothesis probability =   9.766331e-02
 
Photon flux (15-150 keV)    in 296.2 sec: 4.77820E-02 ( -0.0068264  0.0074851 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.06041e-06 ( -1.8711e-07  1.46302e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from  301.656 sec. to  302.656 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.17301     ( -0.584956   0.625521 )
Norm@50keV  : 2.46505E-03    ( -0.000898458   0.000898353 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.61 using 59 PHA bins.
# Reduced chi-squared =         0.9581 for     57 degrees of freedom 
# Null hypothesis probability =   5.651262e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.288335 ( -0.10678  0.107698 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.51988e-08 ( -9.86464e-09  1.01912e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from  301.656 sec. to  302.656 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.62954     ( -3.79305   -2.70725 )
Epeak [keV] : 61.2025      ( -14.9729 289.333 )
Norm@50keV  : 0.169928    ( -0.20962   566.695 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.64 using 59 PHA bins.
# Reduced chi-squared =         0.9222 for     56 degrees of freedom 
# Null hypothesis probability =   6.403367e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.243605 ( -0.105408  0.116004 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.93135e-08 ( -8.08427e-09  1.09877e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 273.568 sec.
Hardness ratio (energy fluence ratio) = 1.35344328486

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

    S(15-50 keV)  = 4.15389e-07
S(50-150 keV) = 6.253651e-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 = -0.362055904287, IMY = 0.00947300589579

    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:
-12.099410 119.784000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
120.6147  33.8741    2.6  22.9   62.5   0.5512   4.5 ------	UNKNOWN                       
135.0746 -17.6975    2.2  56.5  -11.8   2.2229   5.2 ------	UNKNOWN                       
196.4520  40.7253    2.8  36.9 -137.9   0.6888   4.1 ------	UNKNOWN

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

    Time interval of the image:
119.784000 415.956000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
115.9317  -8.0224    2.7  54.6   13.6   6.8518   4.3 ------	UNKNOWN                       
164.8090  53.8105    1.8  19.9 -178.3   1.6199   6.3 ------	UNKNOWN                       
189.8293  40.2014    2.5  32.0 -135.5   1.6003   4.6 ------	UNKNOWN                       
173.1599   0.3384    2.4  43.4  -64.6   4.8303   4.8 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
587.900600 963.032300
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.3066  35.4265    7.2  25.2  163.2   0.1758   1.6    8.9	Her X-1                       
268.4244  -1.5687   14.0  59.2 -165.0   0.6225   0.9    7.7	SW J1753.5-0127               
239.5464  19.9853    2.5  25.1 -148.2   0.4740   4.6 ------	UNKNOWN                       
181.2819  19.5229    3.0  41.2  -37.0   0.6712   3.8 ------	UNKNOWN