Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Sat Jan 11 23:32:28 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger568849
======================================================================

  Trigger: 00568849      Segment: 000

  BAT Trigger Time: 399647067.52   [s; MET]
      Trigger Stop: 399647068.032   [s; MET]
               UTC: 2013-08-31T13:04:16.543620    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 358.64872508801   Dec: 29.4481629872927  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    10.54
     Image Trigger?:     NO
     Rate S/N Ratio:     19.3907194296653  [ if not an image trigger ]
     Image S/N Ratio:    10.54

  Analysis Position:   [ source = BAT ]
    RA: 358.64872508801   Dec: 29.4481629872927  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 358.635142583249   Dec: 29.4305150706284  [deg; J2000]  
        { 23h 54m 32.4s , +29d 25' 49.9" }
         +/- 0.66811953680312 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.213143703255965 [arcmin] (formal 1-sigma fit error)
    SNR: 54.1161269143636
 
  Angular difference between the analysis and refined position is 1.274724 arcmin
 
  Partial Coding Fraction: 0.28125    [ including projection effects ]

  Duration
     T90: 30.191999912262 +/- 2.32627165769635
        Measured from: 0.612000048160553
                   to: 30.8039999604225     [s; relative to TRIGTIME]
     T50: 7.99199998378754 +/- 0.589250360445893
        Measured from: 2.41200000047684
                   to: 10.4039999842644     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 2.2960000038147     
                   to: 3.2960000038147     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -1.85600000619888     
                   to: 41.37600004673     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     3.499010   4.203083   2.460218   0.582344
           0.068236   0.072227   0.061454   0.046134 [error]
 Peak      0.403943   0.579123   0.391252   0.101857
           0.016941   0.019521   0.017310   0.011168 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   43.232   -1.856   41.376
T90    30.192    0.612   30.804
T50     7.992    2.412   10.404
Peak    1.000    2.296    3.296
 
 
====== 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      -1.928    -0.049      0.049       -           -               -         1.64e-02     -4.10e-04          4.10e-04      56.670   57
CPL     -1.914    -0.222      0.187      319.855    -319.842      -319.855      1.66e-02     -3.46e-03          3.68e-03      56.660   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      -1.703     -0.074     0.073       -           -               -         1.02e-01     -4.27e-03          4.26e-03      56.440   57
CPL     -1.545     -0.196     0.279      149.325      N/A           N/A         1.22e-01        N/A               N/A         55.390   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   1.35e-06  1.92e-06  2.01e-06  3.90e-06  6.50e-06  9.18e-06   erg/cm2
      90%_error_low -6.40e-08 -5.21e-08 -6.65e-08 -2.82e-07 -1.62e-07 -3.24e-07   erg/cm2
      90%_error_hi   6.53e-08  5.19e-08  6.64e-08  2.96e-07  1.62e-07  3.33e-07   erg/cm2
Peak flux       PL   5.10e+00  4.55e+00  2.80e+00  2.61e+00  1.36e+01  1.51e+01   ph/cm2/s
      90%_error_low -3.67e-01 -2.02e-01 -1.47e-01 -2.72e-01 -5.90e-01 -6.12e-01   ph/cm2/s
      90%_error_hi   3.77e-01  2.01e-01  1.46e-01  2.90e-01  5.91e-01  6.13e-01   ph/cm2/s
 
Fluence        CPL   1.35e-06  1.92e-06  2.01e-06  3.83e-06  6.50e-06  9.10e-06   erg/cm2
      90%_error_low -8.31e-08 -5.33e-08 -6.04e-08 -8.60e-07 -1.84e-07 -8.87e-07   erg/cm2
      90%_error_hi   8.31e-08  5.64e-08  7.08e-08  3.63e-07  1.68e-07  3.92e-07   erg/cm2
Peak flux      CPL   4.94e+00  4.61e+00  2.84e+00  2.20e+00  1.34e+01  1.46e+01   ph/cm2/s
      90%_error_low -4.50e-01 -2.23e-01 -1.64e-01 -5.49e-01 -6.20e-01 -8.73e-01   ph/cm2/s
      90%_error_hi   4.59e-01  2.25e-01  1.66e-01  5.11e-01  6.21e-01  8.93e-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
  358.6351    29.4305   0.0035    41.6361    28.7309         8.3350036     54.116 TRIG_00568849                 
 
Foreground time interval of the image:
 -1.856   9.781 (delta_t =  11.637 [sec])
Background time interval of the image:
-239.520  -1.856 (delta_t = 237.664 [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   -1.856 sec. to   41.376 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.9284     ( -0.0488862   0.0486334 )
Norm@50keV  : 1.63560E-02    ( -0.000410423   0.000409716 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.67 using 59 PHA bins.
# Reduced chi-squared =         0.9942 for     57 degrees of freedom 
# Null hypothesis probability =   4.873431e-01
 
Photon flux (15-150 keV)    in 43.23 sec: 2.37624 ( -0.06955  0.06992 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.50439e-06 ( -1.6167e-07  1.6192e-07 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -1.856 sec. to   41.376 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.9144     ( -0.222379   0.187345 )
Epeak [keV] : 319.855      ( -321.906 -321.919 )
Norm@50keV  : 1.66107E-02    ( -0.00345675   0.00367831 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.66 using 59 PHA bins.
# Reduced chi-squared =          1.012 for     56 degrees of freedom 
# Null hypothesis probability =   4.503941e-01
 
Photon flux (15-150 keV)    in 43.23 sec: 2.37319 ( -0.07944  0.07253 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.49747e-06 ( -1.84186e-07  1.6807e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from    2.296 sec. to    3.296 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.70336     ( -0.0735909   0.0729188 )
Norm@50keV  : 0.101943    ( -0.00427478   0.00425852 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.44 using 59 PHA bins.
# Reduced chi-squared =         0.9902 for     57 degrees of freedom 
# Null hypothesis probability =   4.960543e-01
 
Photon flux (15-150 keV)    in 1 sec: 13.5557 ( -0.5896  0.5909 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.43757e-07 ( -4.10018e-08  4.11155e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from    2.296 sec. to    3.296 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.54476     ( -0.196087   0.278735 )
Epeak [keV] : 149.325      (   )
Norm@50keV  : 0.121913    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.39 using 59 PHA bins.
# Reduced chi-squared =         0.9892 for     56 degrees of freedom 
# Null hypothesis probability =   4.977414e-01
 
Photon flux (15-150 keV)    in 1 sec: 13.4362 ( -0.6196  0.6213 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.35255e-07 ( -4.36141e-08  4.34685e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 30.192 sec.
Hardness ratio (energy fluence ratio) = 1.05089677635

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

    S(15-50 keV)  = 3.267213e-06
S(50-150 keV) = 3.237191e-06

    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 = 7.795257443649564E-01, IMY = -4.273236697306579E-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:
-239.520000 -1.856000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
285.1341 -25.1333    0.0  48.6 -135.1   0.5448   0.7   13.8	HT1900.1-2455                 
299.5990  35.1945    2.0  45.5  -45.9   2.5643   5.7    0.6	Cyg X-1                       
308.1438  40.9982    1.7  46.1  -33.6   2.3322   6.7    3.1	Cyg X-3                       
326.3221  38.3048    5.0  39.5  -15.0   0.5112   2.3    7.2	Cyg X-2                       
337.0766  43.4778    3.5  45.1   -3.4   0.9242   3.3 ------	UNKNOWN

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

    Time interval of the image:
-1.856000 9.780590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
285.1216 -25.1207   17.6  48.6 -135.0  -0.1052  -0.7   12.9	HT1900.1-2455                 
299.6558  35.2308    6.8  45.5  -45.8  -0.2245  -1.7    3.7	Cyg X-1                       
308.2612  40.9829   84.5  46.1  -33.5   0.0137   0.1    7.1	Cyg X-3                       
326.3466  38.3763    5.0  39.5  -15.0  -0.1851  -2.3    8.9	Cyg X-2                       
358.6351  29.4305    0.2  41.6   28.7   8.3349  54.2 ------	UNKNOWN                       
315.3471  -9.9365    3.0  16.2 -135.4   0.1932   3.8 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
113.180600 850.580610
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.4851  35.2952    9.5  49.6  174.9   1.2050   1.2    7.6	Cyg X-1                       
308.1191  40.9370    2.0  42.3 -178.2   3.1880   5.7    1.0	Cyg X-3                       
326.2021  38.4517    4.2  28.2  179.3   1.0150   2.7    7.9	Cyg X-2                       
296.2195  48.9517    3.6  50.6 -167.0   3.2605   3.2 ------	UNKNOWN                       
 49.9397  20.5409    2.4  47.0  -29.5   3.2798   4.8 ------	UNKNOWN