Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Wed Jan 22 19:40:05 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger163170
======================================================================

  Trigger: 00163170      Segment: 000

  BAT Trigger Time: 153218379.2   [s; MET]
      Trigger Stop: 153218383.296   [s; MET]
               UTC: 2005-11-09T08:39:39.370220    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 345.43961754781   Dec: 38.6721088138371  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    9.84
     Image Trigger?:     NO
     Rate S/N Ratio:     15.0665191733194  [ if not an image trigger ]
     Image S/N Ratio:    9.84

  Analysis Position:   [ source = BAT ]
    RA: 345.43961754781   Dec: 38.6721088138371  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 345.464375018087   Dec: 38.6639792520191  [deg; J2000]  
        { 23h 01m 51.5s , +38d 39' 50.3" }
         +/- 1.88100279694958 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.801763942522212 [arcmin] (formal 1-sigma fit error)
    SNR: 12.334838391043
 
  Angular difference between the analysis and refined position is 1.258203 arcmin
 
  Partial Coding Fraction: 0.8984375    [ including projection effects ]

  Duration
     T90: 15.6960000097752 +/- 4.11711939276437
        Measured from: -6.81599998474121
                   to: 8.88000002503395     [s; relative to TRIGTIME]
     T50: 5.98400002717972 +/- 2.04719515127314
        Measured from: -1.39599999785423
                   to: 4.58800002932549     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.0920000076293945     
                   to: 1.09200000762939     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -8.14399999380112     
                   to: 10.8120000064373     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.178071   0.225928   0.093466   0.029147
           0.022444   0.023360   0.020712   0.019859 [error]
 Peak      0.028884   0.016853   0.019323   0.005033
           0.005349   0.005603   0.004861   0.004771 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   18.956   -8.144   10.812
T90    15.696   -6.816    8.880
T50     5.984   -1.396    4.588
Peak    1.000    0.092    1.092
 
 
====== 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      -1.979    -0.239      0.223       -           -               -         1.52e-03     -2.55e-04          2.51e-04      64.670   57
CPL     -0.360    -1.128      1.493       39.446      -8.143        11.799      1.43e-02     -1.43e-02          1.04e-01      57.980   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      -1.851     -0.478     0.414       -           -               -         4.02e-03     -1.21e-03          1.13e-03      53.660   57
CPL     -1.756     -0.654     1.667      115.833      N/A           N/A         4.54e-03        N/A               N/A         53.640   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   5.77e-08  7.92e-08  8.04e-08  1.48e-07  2.65e-07  3.66e-07   erg/cm2
      90%_error_low -9.42e-09 -1.03e-08 -1.78e-08 -5.53e-08 -4.17e-08 -7.90e-08   erg/cm2
      90%_error_hi   9.61e-09  1.02e-08  1.86e-08  7.39e-08  4.32e-08  9.40e-08   erg/cm2
Peak flux       PL   2.32e-01  1.90e-01  1.05e-01  8.59e-02  5.66e-01  6.13e-01   ph/cm2/s
      90%_error_low -7.20e-02 -4.22e-02 -4.03e-02 -5.03e-02 -1.25e-01 -1.41e-01   ph/cm2/s
      90%_error_hi   7.61e-02  4.21e-02  4.10e-02  7.93e-02  1.25e-01  1.44e-01   ph/cm2/s
 
Fluence        CPL   5.22e-08  9.50e-08  6.84e-08  1.45e-08  2.28e-07  2.30e-07   erg/cm2
      90%_error_low -1.08e-08 -1.48e-08 -2.43e-08    N/A    -3.90e-08 -4.10e-08   erg/cm2
      90%_error_hi   1.07e-08  1.53e-08  2.36e-08    N/A     4.54e-08  6.37e-08   erg/cm2
Peak flux      CPL   2.30e-01  1.92e-01  1.06e-01  7.57e-02  5.64e-01  6.03e-01   ph/cm2/s
      90%_error_low     N/A   -4.43e-02 -4.07e-02 -7.57e-02 -1.26e-01 -1.54e-01   ph/cm2/s
      90%_error_hi      N/A    5.43e-02  4.35e-02  7.08e-02  1.26e-01  1.49e-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
  345.4644    38.6640   0.0156    11.8595    98.6082         0.5388982     12.335 TRIG_00163170                 
 
Foreground time interval of the image:
 -8.144  10.812 (delta_t =  18.956 [sec])
Background time interval of the image:
-299.200  -8.144 (delta_t = 291.056 [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   -8.144 sec. to   10.812 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.97893     ( -0.238947   0.22298 )
Norm@50keV  : 1.51625E-03    ( -0.000255455   0.000250574 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.67 using 59 PHA bins.
# Reduced chi-squared =          1.135 for     57 degrees of freedom 
# Null hypothesis probability =   2.265903e-01
 
Photon flux (15-150 keV)    in 18.96 sec: 0.225278 ( -0.028322  0.028327 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.64886e-07 ( -4.17202e-08  4.31971e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -8.144 sec. to   10.812 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.359943     ( -1.12817   1.49292 )
Epeak [keV] : 39.4461      ( -8.14345 11.7991 )
Norm@50keV  : 1.42704E-02    ( -0.014269   0.104049 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.98 using 59 PHA bins.
# Reduced chi-squared =          1.035 for     56 degrees of freedom 
# Null hypothesis probability =   4.020825e-01
 
Photon flux (15-150 keV)    in 18.96 sec: 0.215334 ( -0.028346  0.028607 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.27928e-07 ( -3.90248e-08  4.54282e-08 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from    0.092 sec. to    1.092 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.85134     ( -0.478306   0.413971 )
Norm@50keV  : 4.02285E-03    ( -0.00120787   0.0011265 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.66 using 59 PHA bins.
# Reduced chi-squared =         0.9414 for     57 degrees of freedom 
# Null hypothesis probability =   6.012115e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.565795 ( -0.125124  0.125137 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.69947e-08 ( -1.04951e-08  1.1014e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from    0.092 sec. to    1.092 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.7562     ( -0.653012   1.66791 )
Epeak [keV] : 115.833      (   )
Norm@50keV  : 4.54213E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.64 using 59 PHA bins.
# Reduced chi-squared =         0.9579 for     56 degrees of freedom 
# Null hypothesis probability =   5.645287e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.564114 ( -0.126343  0.126085 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.6686e-08 ( -1.08967e-08  9.66403e-09 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 15.696 sec.
Hardness ratio (energy fluence ratio) = 1.01472884027

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

    S(15-50 keV)  = 1.3690286e-07
S(50-150 keV) = 1.2798345e-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 = -3.143115528553913E-02, IMY = -2.076287152403848E-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:
-299.200000 -8.144000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.5917  35.1970    0.2  24.7  -90.3  13.4641  48.1    0.3	Cyg X-1                       
308.1177  40.9772    1.2  16.7  -79.3   2.2403  10.0    1.5	Cyg X-3                       
326.0304  38.4614    9.2   4.1 -121.8   0.2627   1.3   10.7	Cyg X-2                       
 25.4694  43.0650    3.3  40.3   70.8   3.5175   3.5 ------	UNKNOWN                       
 36.6593  71.3728    3.7  44.2   27.7   1.6530   3.1 ------	UNKNOWN                       
270.2917  47.5686    3.6  42.4  -57.1   1.9992   3.2 ------	UNKNOWN

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

    Time interval of the image:
-8.144000 10.812000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.6854  35.0861    3.4  24.7  -90.6   0.1936   3.4    8.4	Cyg X-1                       
308.2493  41.1214    8.3  16.6  -78.9   0.0662   1.4   11.9	Cyg X-3                       
326.1296  38.2587    8.4   4.1 -124.7   0.0555   1.4    4.3	Cyg X-2                       
 55.6849  76.0082    2.4  49.5   21.4   0.6834   4.8 ------	UNKNOWN                       
355.7701  31.0694    2.3  22.7  110.3   0.2673   5.0 ------	UNKNOWN                       
345.4644  38.6640    0.9  11.9   98.6   0.5387  12.3 ------	UNKNOWN                       
294.4867  30.1983    2.2  30.8  -95.9   0.3683   5.2 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
70.500600 302.887100
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.5865  35.2111    0.5  36.4  -86.3  11.4760  24.8    0.6	Cyg X-1                       
308.1540  40.9531    1.8  28.5  -78.9   1.6611   6.5    2.0	Cyg X-3                       
326.0033  38.1607    0.0  15.2  -91.4   0.3380   1.9   12.5	Cyg X-2                       
 18.3254   8.2741    2.7  42.4  121.7   3.1473   4.3 ------	UNKNOWN                       
 52.5793  55.6210    2.8  46.6   40.3   2.9994   4.2 ------	UNKNOWN                       
  9.5439   9.1569    2.6  36.6  131.9   1.5634   4.5 ------	UNKNOWN