Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Sun Jan 12 00:44:31 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger561974
======================================================================

  Trigger: 00561974      Segment: 000

  BAT Trigger Time: 395663824.256   [s; MET]
      Trigger Stop: 395663824.768   [s; MET]
               UTC: 2013-07-16T10:36:53.459220    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 179.547406394627   Dec: 63.0656816836336  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.64
     Image Trigger?:     NO
     Rate S/N Ratio:     27.8747197295327  [ if not an image trigger ]
     Image S/N Ratio:    7.64

  Analysis Position:   [ source = BAT ]
    RA: 179.547406394627   Dec: 63.0656816836336  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 179.547   Dec: 63.0657  [deg; J2000]
        { 11h 58m 11.3s , +63d 03' 56.5" }
        +/- 2.62718612864 [arcmin] (estimated 90% radius based on SNR)
    SNR: 7.65424863938
 
 
  Angular difference between the analysis and refined position is 0.011100 arcmin
 
  Partial Coding Fraction: 0.6328125    [ including projection effects ]

  Duration
     T90: 87.6719999909401 +/- 19.9059138688552
        Measured from: 0.11599999666214
                   to: 87.7879999876022     [s; relative to TRIGTIME]
     T50: 63.0159999728203 +/- 37.071669430004
        Measured from: 2.37999999523163
                   to: 65.3959999680519     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.0259999632835388     
                   to: 0.974000036716461     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 0.0200000405311584     
                   to: 106.756000041962     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.028692   0.200758   0.184737   0.037264
           0.061939   0.063724   0.056044   0.048882 [error]
 Peak      0.029849   0.030058   0.049178   0.025473
           0.007794   0.008299   0.007794   0.007134 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  106.736    0.020  106.756
T90    87.672    0.116   87.788
T50    63.016    2.380   65.396
Peak    1.000   -0.026    0.974
 
 
====== 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      -1.317    -0.643      0.634       -           -               -         3.13e-04     -1.14e-04          1.13e-04      41.920   57
CPL      0.303    -2.123      8.136       82.064     -63.880       -82.064      1.59e-03     -1.59e-03          7.20e-01      41.010   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      -0.903     -0.358     0.385       -           -               -         8.56e-03     -1.76e-03          1.71e-03      62.570   57
CPL     -0.900     -0.357     0.398     9999.360    -9999.360      -9999.360      8.62e-03     -1.64e-03          3.24e-02      62.570   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   3.59e-08  7.38e-08  1.19e-07  4.25e-07  3.29e-07  6.54e-07   erg/cm2
      90%_error_low -2.04e-08 -2.99e-08 -5.28e-08 -2.93e-07 -1.29e-07 -3.51e-07   erg/cm2
      90%_error_hi   2.49e-08  2.90e-08  5.15e-08  5.51e-07  1.32e-07  5.64e-07   erg/cm2
Peak flux       PL   1.99e-01  2.87e-01  3.07e-01  6.10e-01  9.82e-01  1.40e+00   ph/cm2/s
      90%_error_low -8.21e-02 -7.88e-02 -6.09e-02 -2.38e-01 -1.98e-01 -2.85e-01   ph/cm2/s
      90%_error_hi   9.88e-02  7.67e-02  6.00e-02  3.28e-01  2.00e-01  3.09e-01   ph/cm2/s
 
Fluence        CPL   2.32e-08  7.96e-08  1.39e-07  1.08e-07  3.10e-07  3.49e-07   erg/cm2
      90%_error_low -2.26e-08 -4.77e-08 -6.45e-08 -9.79e-08 -1.27e-07 -1.63e-07   erg/cm2
      90%_error_hi   3.26e-08  3.64e-08  7.39e-08  6.11e-07  1.37e-07  8.73e-07   erg/cm2
Peak flux      CPL   2.00e-01  2.88e-01  3.07e-01  6.14e-01  9.83e-01  1.40e+00   ph/cm2/s
      90%_error_low -2.00e-01 -8.16e-02 -6.08e-02     N/A   -2.11e-01 -5.27e-01   ph/cm2/s
      90%_error_hi   9.76e-02  7.63e-02  8.32e-02     N/A    1.98e-01  2.77e-01   ph/cm2/s
 
======================================================================
  • Special notes of this burst




    Image

    Pre-slew 50.0-350.0 keV image (Event data)

    #RAcent DECcent POSerr Theta  Phi  Peak_Cts  SNR Name
179.547 63.066 0.000 35.583 -2.803 0.067 7.654 TRIG_00561974
 
Image time interval: 0.000 to 0.512 [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    0.020 sec. to  106.756 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.31688     ( -0.643359   0.633924 )
Norm@50keV  : 3.12851E-04    ( -0.000113804   0.000113475 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          41.92 using 59 PHA bins.
# Reduced chi-squared =         0.7354 for     57 degrees of freedom 
# Null hypothesis probability =   9.328232e-01
 
Photon flux (15-150 keV)    in 106.7 sec: 3.74425E-02 ( -0.0138701  0.0139847 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.28575e-07 ( -1.29125e-07  1.32493e-07 ) ergs/cm2
    Cutoff power-law model
    Time interval is from    0.020 sec. to  106.756 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.302803     ( -2.13093   8.1274 )
Epeak [keV] : 82.0643      ( -63.8362 -82.0209 )
Norm@50keV  : 1.58901E-03    ( -0.00160606   0.719823 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          41.01 using 59 PHA bins.
# Reduced chi-squared =         0.7323 for     56 degrees of freedom 
# Null hypothesis probability =   9.335166e-01
 
Photon flux (15-150 keV)    in 106.7 sec: 3.44888E-02 ( -0.0155142  0.0150745 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.10195e-07 ( -1.26771e-07  1.36575e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from   -0.026 sec. to    0.974 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.902895     ( -0.357761   0.385233 )
Norm@50keV  : 8.55758E-03    ( -0.00175572   0.00170538 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          62.57 using 59 PHA bins.
# Reduced chi-squared =          1.098 for     57 degrees of freedom 
# Null hypothesis probability =   2.853009e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.982235 ( -0.19792  0.199815 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.59423e-08 ( -1.92168e-08  1.93075e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -0.026 sec. to    0.974 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.899939     ( -0.358095   0.396643 )
Epeak [keV] : 9999.36      ( -9999.36 -9999.36 )
Norm@50keV  : 8.61831E-03    ( -0.00163962   0.0323688 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          62.57 using 59 PHA bins.
# Reduced chi-squared =          1.117 for     56 degrees of freedom 
# Null hypothesis probability =   2.545671e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.983113 ( -0.210584  0.197597 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.39053e-09 ( 0  0 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 87.672 sec.
Hardness ratio (energy fluence ratio) = 1.60575762694

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

    S(15-50 keV)  = 1.0973422e-07
S(50-150 keV) = 2.188434e-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 = 0.714634977033, IMY = 0.0349904088144

    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:
-239.256000 0.020000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
194.7763  39.1445    2.2  21.3   44.2   1.1374   5.1 ------	UNKNOWN                       
168.6503 -26.2046    3.0  54.1  177.2   2.8145   3.8 ------	UNKNOWN                       
149.4635 -27.1149    3.2  59.4 -163.2   5.6183   3.6 ------	UNKNOWN                       
137.5524 -15.5205    3.9  55.3 -144.8   3.1779   3.0 ------	UNKNOWN

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

    Time interval of the image:
0.020000 16.444600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
213.4204  25.7493    2.4  35.9   75.9   0.6504   4.9 ------	UNKNOWN                       
151.2703 -14.5902    2.3  47.3 -158.4   0.3762   5.0 ------	UNKNOWN                       
135.7791 -11.2758    2.3  53.2 -139.8   1.1310   5.0 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
78.844600 962.854000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
216.5169  55.1146    2.8  20.3  109.9   2.2198   4.1 ------	UNKNOWN                       
182.2987  41.0889    3.2  22.1 -171.6   1.6345   3.6 ------	UNKNOWN                       
 73.7052  71.5630    2.1  36.2  -17.0   3.1958   5.5 ------	UNKNOWN                       
162.0100   9.2159   10.9  55.3 -144.8   2.9866   1.1 ------	UNKNOWN