Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Mon Jan 13 06:09:51 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger516997
======================================================================

  Trigger: 00516997      Segment: 000

  BAT Trigger Time: 352669058.068   [s; MET]
      Trigger Stop: 352669058.132   [s; MET]
               UTC: 2012-03-05T19:37:30.107140    [includes UTCF correction] 
       Where From?: (*SHORT BURST*) TDRSS scaled map message

  BAT 
    RA: 47.5464362623518   Dec: 28.4934691193433  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    18.18
     Image Trigger?:     NO
     Rate S/N Ratio:     186.566342087741  [ if not an image trigger ]
     Image S/N Ratio:    18.18

  Analysis Position:   [ source = BAT ]
    RA: 47.5464362623518   Dec: 28.4934691193433  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 47.5489609882108   Dec: 28.494791756286  [deg; J2000]  
        { 03h 10m 11.8s , +28d 29' 41.3" }
         +/- 0.927685758260998 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.269958629434275 [arcmin] (formal 1-sigma fit error)
    SNR: 33.8601235139361
 
  Angular difference between the analysis and refined position is 0.154991 arcmin
 
  Partial Coding Fraction: 0.921875    [ including projection effects ]

  Duration
     T90: 0.0999999046325684 +/- 0.0120000243186951
        Measured from: 0.00400000810623169
                   to: 0.1039999127388     [s; relative to TRIGTIME]
     T50: 0.0279999375343323 +/- 0.00565686571343518
        Measured from: 0.0199999809265137
                   to: 0.0479999184608459     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.434000015258789     
                   to: 0.565999984741211     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 0     
                   to: 0.12799996137619     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.052298   0.097002   0.099583   0.033456
           0.003540   0.004716   0.005186   0.004097 [error]
 Peak      0.054310   0.103196   0.103130   0.031328
           0.005824   0.006688   0.006726   0.005624 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    0.128    0.000    0.128
T90     0.100    0.004    0.104
T50     0.028    0.020    0.048
Peak    1.000   -0.434    0.566
 
 
====== 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      -0.992    -0.089      0.090       -           -               -         1.43e-01     -7.49e-03          7.49e-03      64.320   57
CPL     -0.675    -0.340      0.372      222.886     -92.581      -222.886      2.04e-01     -5.55e-02          1.01e-01      61.830   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      -1.039     -0.120     0.121       -           -               -         1.92e-02     -1.31e-03          1.31e-03      52.630   57
CPL     -0.838     -0.259     0.490      313.166    -313.166      -313.166      2.39e-02     -5.74e-03          1.62e-02      52.050   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   1.46e-08  3.66e-08  7.36e-08  3.71e-07  1.99e-07  4.96e-07   erg/cm2
      90%_error_low -1.38e-09 -2.13e-09 -4.69e-09 -4.99e-08 -1.23e-08 -5.34e-08   erg/cm2
      90%_error_hi   1.42e-09  2.12e-09  4.67e-09  5.49e-08  1.24e-08  5.79e-08   erg/cm2
Peak flux       PL   5.08e-01  6.73e-01  6.55e-01  1.14e+00  2.21e+00  2.98e+00   ph/cm2/s
      90%_error_low -6.68e-02 -5.48e-02 -5.20e-02 -1.84e-01 -1.53e-01 -2.31e-01   ph/cm2/s
      90%_error_hi   6.96e-02  5.43e-02  5.16e-02  2.06e-01  1.53e-01  2.38e-01   ph/cm2/s
 
Fluence        CPL   1.37e-08  3.78e-08  7.58e-08  2.30e-07  1.94e-07  3.58e-07   erg/cm2
      90%_error_low -1.65e-09 -2.52e-09 -5.31e-09 -8.85e-08 -1.35e-08 -8.82e-08   erg/cm2
      90%_error_hi   1.67e-09  2.57e-09  5.40e-09  1.53e-07  1.34e-08  1.53e-07   erg/cm2
Peak flux      CPL   4.86e-01  6.84e-01  6.69e-01  9.01e-01  2.19e+00  2.74e+00   ph/cm2/s
      90%_error_low -8.15e-02 -5.94e-02 -6.03e-02 -3.57e-01 -1.58e-01 -3.90e-01   ph/cm2/s
      90%_error_hi   7.85e-02  6.11e-02  6.16e-02  2.97e-01  1.57e-01  3.61e-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
       47.5490    28.4948   0.0057    11.3491   109.5526         0.2940537     33.860 TRIG_00516997                 
     
    Foreground time interval of the image:
      0.000   0.128 (delta_t =   0.128 [sec])
    Background time interval of the image:
    -657.567 -640.191 (delta_t =  17.377 [sec])
    -239.068   0.000 (delta_t = 239.068 [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    0.000 sec. to    0.128 sec.
     
    Spectral model in power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: -0.992083     ( -0.0891914   0.089597 )
    Norm@50keV  : 0.143079    ( -0.00748925   0.00748869 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          64.32 using 59 PHA bins.
    # Reduced chi-squared =          1.128 for     57 degrees of freedom 
    # Null hypothesis probability =   2.358180e-01
     
    Photon flux (15-150 keV)    in 0.128 sec: 16.4658 ( -0.8623  0.8624 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 1.98619e-07 ( -1.23158e-08  1.23945e-08 ) ergs/cm2
     
    
    Cutoff power-law model
    Time interval is from    0.000 sec. to    0.128 sec.
    Spectral model in the cutoff power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: -0.675106     ( -0.339679   0.372193 )
    Epeak [keV] : 222.886      ( -92.5828 -222.887 )
    Norm@50keV  : 0.203659    ( -0.0554964   0.10073 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          61.83 using 59 PHA bins.
    # Reduced chi-squared =          1.104 for     56 degrees of freedom 
    # Null hypothesis probability =   2.758933e-01
     
    Photon flux (15-150 keV)    in 0.128 sec: 16.2972 ( -0.8846  0.8823 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 1.94173e-07 ( -1.34852e-08  1.33896e-08 ) ergs/cm2
     
    

    1-s peak spectrum fit

    Power-law model
    Time interval is from   -0.434 sec. to    0.566 sec.
     
    Spectral model in power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: -1.03872     ( -0.119932   0.12135 )
    Norm@50keV  : 1.91597E-02    ( -0.00130952   0.00130942 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          52.63 using 59 PHA bins.
    # Reduced chi-squared =         0.9234 for     57 degrees of freedom 
    # Null hypothesis probability =   6.395168e-01
     
    Photon flux (15-150 keV)    in 1 sec: 2.21107 ( -0.15266  0.15272 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 2.04433e-07 ( -1.60464e-08  1.61744e-08 ) ergs/cm2
     
    
    Cutoff power-law model
    Time interval is from   -0.434 sec. to    0.566 sec.
    Spectral model in the cutoff power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: -0.838235     ( -0.259232   0.489827 )
    Epeak [keV] : 313.166      ( -313.178 -313.178 )
    Norm@50keV  : 2.38624E-02    ( -0.00574322   0.0161506 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          52.05 using 59 PHA bins.
    # Reduced chi-squared =         0.9295 for     56 degrees of freedom 
    # Null hypothesis probability =   6.250831e-01
     
    Photon flux (15-150 keV)    in 1 sec: 2.19372 ( -0.15766  0.15739 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 2.01572e-07 ( -1.75075e-08  1.73402e-08 ) ergs/cm2
     
    

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot

    T90                                   = 0.0999999 sec.
    Hardness ratio (energy fluence ratio) = 2.01099047663
    

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

    S(15-50 keV)  = 5.11536e-08
    S(50-150 keV) = 1.4746396e-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 = -6.717245590820499E-02, IMY = -1.891371247912358E-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:
    -657.567400 -640.190500
    -239.068000 0.000000
     
    # RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
    #  [deg]    [deg]    ['] [deg]  [deg]                   [']
    326.1660  38.2232    4.6  58.8  -20.7   3.0771   2.5    5.9	Cyg X-2                       
     10.3249  66.6781    2.7  44.2   24.5   1.5516   4.3 ------	UNKNOWN                       
     75.1851  -4.5296    2.9  48.9  160.4   2.9520   4.0 ------	UNKNOWN                       
     10.5027  47.4878    2.4  29.6    3.4   0.9683   4.9 ------	UNKNOWN                       
    338.3605  46.8582    2.5  49.5  -10.5   1.7101   4.6 ------	UNKNOWN                       
     49.6163 -24.2463    2.9  51.5 -158.3   2.0616   4.0 ------	UNKNOWN                       
     31.7743 -12.1515    3.1  37.6 -135.9   1.2198   3.7 ------	UNKNOWN                       
     35.8994 -27.8760    3.3  53.2 -142.2   3.4967   3.5 ------	UNKNOWN                       
    354.4565   7.8306    2.8  42.7  -68.5   3.9896   4.1  575.1	UNKNOWN                       
     25.1472 -21.5895    3.0  48.0 -128.8   3.1938   3.9 ------	UNKNOWN                       
    

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

    Time interval of the image:
    0.000000 0.128000
     
    # RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
    #  [deg]    [deg]    ['] [deg]  [deg]                   [']
    326.1591  38.3321    5.4  58.8  -20.5   0.1130   2.1    0.9	Cyg X-2                       
     47.5490  28.4948    0.3  11.3  109.6   0.2941  33.9 ------	UNKNOWN                       
     13.0763 -10.2408    2.1  41.7 -107.5   0.1732   5.6 ------	UNKNOWN                       
    

    Post-slew image of 15-350 keV band

    Time interval of the image:
    51.832600 662.964900
     
    # RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
    #  [deg]    [deg]    ['] [deg]  [deg]                   [']
     83.6409  22.0128    0.5  33.2  113.3  24.7545  24.3    0.4	Crab                          
     36.2541  72.7945    2.9  44.7   15.7   3.9846   4.0 ------	UNKNOWN                       
     51.3681 -25.4206    3.0  54.0 -163.9   6.3668   3.8 ------	UNKNOWN                       
    337.9465  54.9533    2.9  55.5  -20.4   7.2141   3.9 ------	UNKNOWN                       
     24.5315 -14.0155    2.5  48.0 -128.9  10.8692   4.6 ------	UNKNOWN                       
    349.5269  33.7644    3.4  49.3  -48.1  10.1321   3.4 ------	UNKNOWN