Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Mon Jan 20 06:12:55 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger294974
======================================================================

  Trigger: 00294974      Segment: 000

  BAT Trigger Time: 214652496   [s; MET]
      Trigger Stop: 214652560   [s; MET]
               UTC: 2007-10-21T09:41:33.693520    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 340.635921111961   Dec: 23.70672778378  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.96
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    7.96

  Analysis Position:   [ source = BAT ]
    RA: 340.635921111961   Dec: 23.70672778378  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 340.636   Dec: 23.7067  [deg; J2000]
        { 22h 42m 32.6s , +23d 42' 24.1" }
        +/- 2.65085115519 [arcmin] (estimated 90% radius based on SNR)
    SNR: 7.55681853728
 
 
  Angular difference between the analysis and refined position is 0.004643 arcmin
 
  Partial Coding Fraction: 0.78125    [ including projection effects ]

  Duration
     T90: 228.719999998808 +/- 74.010168577502
        Measured from: -15.7039999961853
                   to: 213.016000002623     [s; relative to TRIGTIME]
     T50: 56.7920000255108 +/- 26.4564581830029
        Measured from: 35.0719999969006
                   to: 91.8640000224113     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 87.3039999902248     
                   to: 88.3039999902248     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -33.5760000050068     
                   to: 250.759999990463     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.778689   0.838050   0.608620   0.127047
           0.081140   0.084552   0.075731   0.068147 [error]
 Peak      0.018853   0.029722   0.025095   0.006295
           0.005040   0.005429   0.004985   0.004259 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  284.336  -33.576  250.760
T90   228.720  -15.704  213.016
T50    56.792   35.072   91.864
Peak    1.000   87.304   88.304
 
 
====== 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: N/A)
 
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      -1.664    -0.200      0.195       -           -               -         5.14e-04     -6.15e-05          6.02e-05      79.830   57
CPL     -1.653    -0.887      0.311     9965.000    -9964.990      -9965.000      5.21e-04     -2.28e-04          5.65e-04      79.860   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      -1.335     -0.358     0.357       -           -               -         5.25e-03     -1.04e-03          1.03e-03      43.560   57
CPL     -1.328     -0.365     0.355     9998.920    -9998.920      -9998.920      5.27e-03     -1.04e-03          1.34e-02      43.560   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   2.18e-07  3.62e-07  4.57e-07  1.15e-06  1.36e-06  2.19e-06   erg/cm2
      90%_error_low -3.54e-08 -3.78e-08 -7.47e-08 -3.49e-07 -1.72e-07 -4.24e-07   erg/cm2
      90%_error_hi   3.65e-08  3.78e-08  7.51e-08  4.41e-07  1.76e-07  5.00e-07   erg/cm2
Peak flux       PL   1.85e-01  2.05e-01  1.62e-01  2.13e-01  6.31e-01  7.65e-01   ph/cm2/s
      90%_error_low -6.13e-02 -4.35e-02 -4.10e-02 -9.44e-02 -1.22e-01 -1.55e-01   ph/cm2/s
      90%_error_hi   6.70e-02  4.24e-02  4.00e-02  1.34e-01  1.22e-01  1.62e-01   ph/cm2/s
 
Fluence        CPL   2.19e-07  3.57e-07  4.57e-07  1.30e-06  1.37e-06  2.28e-06   erg/cm2
      90%_error_low    N/A    -3.93e-08 -7.44e-08    N/A    -1.55e-07 -1.03e-06   erg/cm2
      90%_error_hi     N/A     5.39e-08  7.55e-08    N/A     1.62e-07  3.83e-07   erg/cm2
Peak flux      CPL   1.88e-01  2.05e-01  1.61e-01  2.26e-01  6.33e-01  7.66e-01   ph/cm2/s
      90%_error_low -6.52e-02 -4.31e-02 -3.99e-02     N/A   -1.32e-01 -2.10e-01   ph/cm2/s
      90%_error_hi   6.36e-02  4.62e-02  4.34e-02     N/A    1.25e-01  1.48e-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
340.636 23.707 0.000 19.688 -110.452 0.441 7.557 TRIG_00294974
 
Image time interval: 0.000 to 64.000 [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  -33.576 sec. to  250.760 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.66394     ( -0.20024   0.194551 )
Norm@50keV  : 5.14322E-04    ( -6.15316e-05   6.02358e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          79.83 using 59 PHA bins.
# Reduced chi-squared =          1.400 for     57 degrees of freedom 
# Null hypothesis probability =   2.467476e-02
 
Photon flux (15-150 keV)    in 284.3 sec: 6.74723E-02 ( -0.0070392  0.0070416 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.35827e-06 ( -1.72156e-07  1.75557e-07 ) ergs/cm2
    Cutoff power-law model
    Time interval is from  -33.576 sec. to  250.760 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.65272     ( -0.883275   0.315157 )
Epeak [keV] : 9965.00      ( -9999.22 -9999.23 )
Norm@50keV  : 5.21330E-04    ( -0.000221822   0.000570927 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          79.86 using 59 PHA bins.
# Reduced chi-squared =          1.426 for     56 degrees of freedom 
# Null hypothesis probability =   1.985422e-02
 
Photon flux (15-150 keV)    in 284.3 sec: 6.77778E-02 ( -0.0085393  0.0078633 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.37166e-06 ( -1.54757e-07  1.61637e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from   87.304 sec. to   88.304 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.3351     ( -0.358291   0.356902 )
Norm@50keV  : 5.25181E-03    ( -0.00103992   0.00102795 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          43.56 using 59 PHA bins.
# Reduced chi-squared =         0.7642 for     57 degrees of freedom 
# Null hypothesis probability =   9.049164e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.630793 ( -0.122054  0.122192 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.14731e-08 ( -1.15881e-08  1.18541e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   87.304 sec. to   88.304 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.32764     ( -0.361979   0.358168 )
Epeak [keV] : 9998.92      ( -9999.36 -9999.36 )
Norm@50keV  : 5.27154E-03    ( -0.00104515   0.0133881 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          43.56 using 59 PHA bins.
# Reduced chi-squared =         0.7779 for     56 degrees of freedom 
# Null hypothesis probability =   8.870651e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.633402 ( -0.131537  0.12456 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.17249e-08 ( -1.27594e-08  1.00071e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = N/A sec.
Hardness ratio (energy fluence ratio) = N/A

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

    S(15-50 keV)  = N/A
S(50-150 keV) = N/A

    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 = -0.125029431464, IMY = 0.335269144104

    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:
-239.000000 -33.576000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
326.2388  38.4340    4.2  35.4  -85.8   1.0555   2.7    7.4	Cyg X-2

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

    Time interval of the image:
-33.576000 72.100600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
325.9538  38.2425    5.4  35.6  -86.2   0.5342   2.1   11.3	Cyg X-2                       
 24.4037 -13.7694    2.4  40.8  110.2   2.2355   4.8 ------	UNKNOWN                       
 27.6795  13.2835    2.4  25.9   67.0   0.7257   4.9 ------	UNKNOWN                       
340.5842  23.7503    1.9  19.7 -110.3   0.7807   6.0 ------	UNKNOWN                       
318.4746  -9.8984    2.2  52.0 -155.8   1.6733   5.2 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
119.500600 963.050000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.5965  35.2050    0.4  37.2  -71.3  32.1518  31.4    0.4	Cyg X-1                       
308.0194  40.9181    2.5  32.2  -58.7   2.9377   4.7    4.6	Cyg X-3                       
326.0053  38.2762    2.8  19.2  -46.0   1.6287   4.1    8.3	Cyg X-2                       
356.2876 -24.3704    3.1  50.4  152.6   6.8521   3.7 ------	UNKNOWN                       
  5.0967  64.7180    2.6  44.0    5.9   3.1157   4.5 ------	UNKNOWN                       
353.0136  52.7670    2.9  30.5    5.9   1.6528   4.0 ------	UNKNOWN                       
308.0467  37.6466    1.4  31.1  -64.6   5.3379   8.1 ------	UNKNOWN                       
298.6015  32.1746    3.3  37.8  -76.4   3.9616   3.5 ------	UNKNOWN                       
299.0447   5.6078    2.4  43.9 -116.5   8.7426   4.9 ------	UNKNOWN