Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Sat Oct  4 21:59:07 EDT 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger602803
======================================================================

  Trigger: 00602803      Segment: 000

  BAT Trigger Time: 425655349.568   [s; MET]
      Trigger Stop: 425655350.08   [s; MET]
               UTC: 2014-06-28T13:35:37.371060    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 40.6610673055839   Dec: -0.366404468200361  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    9.01
     Image Trigger?:     NO
     Rate S/N Ratio:     17.0880074906351  [ if not an image trigger ]
     Image S/N Ratio:    9.01

  Analysis Position:   [ source = BAT ]
    RA: 40.6610673055839   Dec: -0.366404468200361  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 40.6699823981067   Dec: -0.378926012908259  [deg; J2000]  
        { 02h 42m 40.8s , -00d 22' 44.1" }
         +/- 0.95685680221616 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.320143748950345 [arcmin] (formal 1-sigma fit error)
    SNR: 32.395141556453
 
  Angular difference between the analysis and refined position is 0.922254 arcmin
 
  Partial Coding Fraction: 0.734375    [ including projection effects ]

  Duration
     T90: 10.539999961853 +/- 0.873768858932836
        Measured from: -0.364000022411346
                   to: 10.1759999394417     [s; relative to TRIGTIME]
     T50: 4.93199992179871 +/- 0.616116891997613
        Measured from: 1.26399999856949
                   to: 6.19599992036819     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.944000005722046     
                   to: 1.94400000572205     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -1.24000000953674     
                   to: 11.1159999966621     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.573056   0.826016   0.600934   0.111912
           0.029662   0.032887   0.031437   0.032799 [error]
 Peak      0.071550   0.128438   0.117457   0.027142
           0.008949   0.010282   0.009828   0.009398 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   12.356   -1.240   11.116
T90    10.540   -0.364   10.176
T50     4.932    1.264    6.196
Peak    1.000    0.944    1.944
 
 
====== 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      -1.556    -0.089      0.088       -           -               -         1.14e-02     -5.78e-04          5.75e-04      48.390   57
CPL     -1.147    -0.356      0.390      100.068     -27.837       284.552      1.86e-02     -6.31e-03          1.08e-02      44.500   56
 
 
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: CPL)
 
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      -1.234     -0.141     0.142       -           -               -         2.36e-02     -2.06e-03          2.05e-03      59.680   57
CPL      0.154     -0.716     0.860       79.390     -13.420        31.910      1.14e-01     -6.21e-02          1.77e-01      47.070   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   1.90e-07  3.38e-07  4.59e-07  1.29e-06  1.33e-06  2.28e-06   erg/cm2
      90%_error_low -1.55e-08 -1.68e-08 -3.12e-08 -1.79e-07 -7.36e-08 -2.05e-07   erg/cm2
      90%_error_hi   1.59e-08  1.67e-08  3.12e-08  1.98e-07  7.42e-08  2.21e-07   erg/cm2
Peak flux       PL   7.54e-01  8.89e-01  7.56e-01  1.09e+00  2.79e+00  3.49e+00   ph/cm2/s
      90%_error_low -1.12e-01 -8.55e-02 -7.83e-02 -2.14e-01 -2.44e-01 -3.22e-01   ph/cm2/s
      90%_error_hi   1.17e-01  8.49e-02  7.79e-02  2.44e-01  2.44e-01  3.27e-01   ph/cm2/s
 
Fluence        CPL   1.78e-07  3.52e-07  4.65e-07  6.78e-07  1.28e-06  1.67e-06   erg/cm2
      90%_error_low -1.84e-08 -2.07e-08 -3.31e-08 -2.72e-07 -8.71e-08 -2.85e-07   erg/cm2
      90%_error_hi   1.87e-08  2.11e-08  3.33e-08  4.98e-07  8.73e-08  5.00e-07   erg/cm2
Peak flux      CPL   5.73e-01  9.93e-01  8.40e-01  3.23e-01  2.64e+00  2.73e+00   ph/cm2/s
      90%_error_low -1.38e-01 -1.06e-01 -9.48e-02 -1.42e-01 -2.56e-01 -2.95e-01   ph/cm2/s
      90%_error_hi   1.44e-01  1.08e-01  9.64e-02  2.43e-01  2.55e-01  3.34e-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
   40.6700    -0.3789   0.0059    30.1014   170.3466         2.1455205     32.395 TRIG_00602803                 
 
Foreground time interval of the image:
 -1.240   9.933 (delta_t =  11.173 [sec])
Background time interval of the image:
-119.568  -1.240 (delta_t = 118.328 [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   -1.240 sec. to   11.116 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.55602     ( -0.0889895   0.088314 )
Norm@50keV  : 1.14325E-02    ( -0.000577842   0.000575419 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          48.39 using 59 PHA bins.
# Reduced chi-squared =         0.8489 for     57 degrees of freedom 
# Null hypothesis probability =   7.846148e-01
 
Photon flux (15-150 keV)    in 12.36 sec: 1.44986 ( -0.07081  0.07087 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.32932e-06 ( -7.36106e-08  7.42015e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -1.240 sec. to   11.116 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.14717     ( -0.356064   0.389692 )
Epeak [keV] : 100.068      ( -27.8379 284.551 )
Norm@50keV  : 1.86173E-02    ( -0.0063082   0.010788 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          44.50 using 59 PHA bins.
# Reduced chi-squared =         0.7947 for     56 degrees of freedom 
# Null hypothesis probability =   8.657930e-01
 
Photon flux (15-150 keV)    in 12.36 sec: 1.41667 ( -0.07632  0.07626 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.2754e-06 ( -8.70972e-08  8.72908e-08 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from    0.944 sec. to    1.944 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.234     ( -0.141403   0.141705 )
Norm@50keV  : 2.36362E-02    ( -0.00205498   0.00205325 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.68 using 59 PHA bins.
# Reduced chi-squared =          1.047 for     57 degrees of freedom 
# Null hypothesis probability =   3.786134e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.78844 ( -0.2436  0.24379 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.37586e-07 ( -2.32229e-08  2.34618e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from    0.944 sec. to    1.944 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.154358     ( -0.71641   0.859718 )
Epeak [keV] : 79.3900      ( -13.4203 31.9103 )
Norm@50keV  : 0.113617    ( -0.0620511   0.176578 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          47.07 using 59 PHA bins.
# Reduced chi-squared =         0.8405 for     56 degrees of freedom 
# Null hypothesis probability =   7.966457e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.64133 ( -0.25557  0.2552 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.15283e-07 ( -2.51927e-08  2.58963e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 10.54 sec.
Hardness ratio (energy fluence ratio) = 1.36037949895

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

    S(15-50 keV)  = 5.278707e-07
S(50-150 keV) = 8.014542e-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 = -5.715028141719019E-01, IMY = -9.721046641122040E-02

    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:
-119.568000 -1.240000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6482  21.9283    2.9  40.3 -102.5   3.1947   4.0    5.2	Crab                          
102.3511 -59.1260    2.5  51.1   31.4   4.4999   4.6 ------	UNKNOWN                       
112.6510  -1.2367    2.6  46.8  -49.1   3.8537   4.4 ------	UNKNOWN

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

    Time interval of the image:
-1.240000 9.932590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6458  21.9864    5.3  40.3 -102.6   0.4499   2.2    1.8	Crab                          
 65.7678 -47.0971    2.2  32.1   55.6   0.4777   5.2 ------	UNKNOWN                       
 40.6700  -0.3789    0.4  30.1  170.3   2.1455  32.4 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
66.532600 327.532590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 48.6106 -42.8074    2.4  43.0   19.0   2.3994   4.8 ------	UNKNOWN                       
  3.6074  36.5215    2.0  50.4  168.7   5.0595   5.9 ------	UNKNOWN                       
 45.8192 -19.7464    2.3  20.0   13.2   1.3002   4.9 ------	UNKNOWN                       
 43.9640   5.3956    2.5   6.7 -122.7   1.1450   4.6 ------	UNKNOWN                       
 76.7819  -5.7507    2.8  36.5  -53.2   1.7120   4.1 ------	UNKNOWN                       
 92.7328 -30.1708    3.5  57.7  -26.2   5.3321   3.3 ------	UNKNOWN                       
 50.6637  54.1911    3.7  55.2 -145.3   5.1667   3.2 ------	UNKNOWN