Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Sat Oct  4 23:02:09 EDT 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger598497
======================================================================

  Trigger: 00598497      Segment: 000

  BAT Trigger Time: 421294945.6   [s; MET]
      Trigger Stop: 421294949.696   [s; MET]
               UTC: 2014-05-09T02:22:13.613280    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 46.608358981037   Dec: -62.6535551180924  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.6
     Image Trigger?:     NO
     Rate S/N Ratio:     10.1488915650922  [ if not an image trigger ]
     Image S/N Ratio:    7.6

  Analysis Position:   [ source = BAT ]
    RA: 46.608358981037   Dec: -62.6535551180924  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 46.5638255707873   Dec: -62.6615448529256  [deg; J2000]  
        { 03h 06m 15.3s , -62d 39' 41.6" }
         +/- 1.88996159479005 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.78407929161078 [arcmin] (formal 1-sigma fit error)
    SNR: 12.2513952930359
 
  Angular difference between the analysis and refined position is 1.317576 arcmin
 
  Partial Coding Fraction: 0.1953125    [ including projection effects ]

  Duration
     T90: 23.216000020504 +/- 5.17115694874123
        Measured from: -2.83200001716614
                   to: 20.3840000033379     [s; relative to TRIGTIME]
     T50: 9.12000000476837 +/- 2.60171022872606
        Measured from: 0.991999983787537
                   to: 10.1119999885559     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 1.77999997138977     
                   to: 2.77999997138977     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -3.80800002813339     
                   to: 23.055999994278     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.553100   0.667540   0.499155   0.195584
           0.068511   0.072066   0.064539   0.056305 [error]
 Peak      0.050710   0.051194   0.074086   0.016698
           0.013950   0.015238   0.013428   0.011574 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   26.864   -3.808   23.056
T90    23.216   -2.832   20.384
T50     9.120    0.992   10.112
Peak    1.000    1.780    2.780
 
 
====== 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      -1.585    -0.196      0.193       -           -               -         4.89e-03     -5.72e-04          5.68e-04      74.120   57
CPL     -1.238    -0.388      0.885      107.727     -50.787      -107.727      7.39e-03        N/A               N/A         73.510   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      -1.493     -0.384     0.389       -           -               -         1.24e-02     -2.93e-03          2.93e-03      60.320   57
CPL     -0.689     -1.149     3.189       85.663     -39.453       -85.663      3.08e-02     -3.08e-02          6.70e-01      59.860   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   1.82e-07  3.17e-07  4.22e-07  1.15e-06  1.23e-06  2.07e-06   erg/cm2
      90%_error_low -3.34e-08 -3.74e-08 -6.39e-08 -3.28e-07 -1.53e-07 -3.88e-07   erg/cm2
      90%_error_hi   3.49e-08  3.71e-08  6.34e-08  4.04e-07  1.55e-07  4.47e-07   erg/cm2
Peak flux       PL   5.09e-01  5.14e-01  3.65e-01  4.13e-01  1.55e+00  1.80e+00   ph/cm2/s
      90%_error_low -1.99e-01 -1.38e-01 -1.01e-01 -1.91e-01 -3.85e-01 -4.23e-01   ph/cm2/s
      90%_error_hi   2.22e-01  1.34e-01  9.85e-02  2.62e-01  3.87e-01  4.23e-01   ph/cm2/s
 
Fluence        CPL   1.72e-07  3.30e-07  4.32e-07  6.81e-07  1.20e-06  1.62e-06   erg/cm2
      90%_error_low -3.94e-08 -4.58e-08 -6.82e-08 -4.41e-07 -1.69e-07 -4.75e-07   erg/cm2
      90%_error_hi   3.99e-08  4.80e-08  7.01e-08  5.76e-07  1.67e-07  6.21e-07   erg/cm2
Peak flux      CPL   4.34e-01  5.53e-01  4.00e-01  2.01e-01  1.51e+00  1.59e+00   ph/cm2/s
      90%_error_low     N/A   -1.54e-01 -1.24e-01 -2.01e-01 -4.19e-01 -4.81e-01   ph/cm2/s
      90%_error_hi      N/A    1.72e-01  1.41e-01  3.94e-01  4.01e-01  4.70e-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
   46.5638   -62.6615   0.0157    44.1914    30.0864         1.7220673     12.251 TRIG_00598497                 
 
Foreground time interval of the image:
 -3.808  23.056 (delta_t =  26.864 [sec])
Background time interval of the image:
-239.600  -3.808 (delta_t = 235.792 [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   -3.808 sec. to   23.056 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.5854     ( -0.195647   0.192991 )
Norm@50keV  : 4.88852E-03    ( -0.000572479   0.000568387 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          74.12 using 59 PHA bins.
# Reduced chi-squared =          1.300 for     57 degrees of freedom 
# Null hypothesis probability =   6.338809e-02
 
Photon flux (15-150 keV)    in 26.86 sec: 0.625410 ( -0.072562  0.072701 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.2304e-06 ( -1.53449e-07  1.54715e-07 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -3.808 sec. to   23.056 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.2377     ( -0.388476   0.885135 )
Epeak [keV] : 107.727      ( -50.7914 -107.732 )
Norm@50keV  : 7.39500E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          73.51 using 59 PHA bins.
# Reduced chi-squared =          1.313 for     56 degrees of freedom 
# Null hypothesis probability =   5.826590e-02
 
Photon flux (15-150 keV)    in 26.86 sec: 0.617269 ( -0.075065  0.074826 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.20068e-06 ( -1.68733e-07  1.67417e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from    1.780 sec. to    2.780 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.49284     ( -0.384184   0.389031 )
Norm@50keV  : 1.24468E-02    ( -0.00292938   0.00292564 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.32 using 59 PHA bins.
# Reduced chi-squared =          1.058 for     57 degrees of freedom 
# Null hypothesis probability =   3.565690e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.55090 ( -0.38515  0.38737 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.18233e-07 ( -2.91448e-08  2.92459e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from    1.780 sec. to    2.780 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.688695     ( -1.15442   3.1845 )
Epeak [keV] : 85.6629      ( -39.1718 -85.3819 )
Norm@50keV  : 3.08357E-02    ( -0.0311119   0.670096 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.86 using 59 PHA bins.
# Reduced chi-squared =          1.069 for     56 degrees of freedom 
# Null hypothesis probability =   3.376244e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.51360 ( -0.41867  0.40068 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.14601e-07 ( -3.06318e-08  3.07272e-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 = 8.411866616131900E-01, IMY = -4.873513786934941E-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:
-239.600000 -3.808000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
  1.9736 -13.6705    3.0  18.8  162.5   0.7354   3.8 ------	UNKNOWN                       
 76.3111 -40.6957    2.5  50.8   -7.4   2.0104   4.6 ------	UNKNOWN                       
343.2215  24.2206    3.7  58.4 -171.7   3.4881   3.2 ------	UNKNOWN                       
 61.7553  -4.2207    2.9  44.8  -60.1   3.5187   4.0 ------	UNKNOWN

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

    Time interval of the image:
-3.808000 23.056000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 46.5638 -62.6615    0.9  44.2   30.1   1.7210  12.2 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
101.100600 962.440000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
146.7266 -51.1453    4.7  50.1   37.3   6.2207   2.5 ------	UNKNOWN                       
314.2267 -48.9232    2.9  49.0  151.4   8.2156   4.0 ------	UNKNOWN                       
 77.2262 -68.1361    3.0  13.7   37.7   1.8460   3.8 ------	UNKNOWN                       
335.5403 -26.1383    2.7  58.3 -175.4  14.1860   4.3 ------	UNKNOWN                       
 15.0871 -32.4055    3.1  36.2 -137.5   3.0847   3.7 ------	UNKNOWN                       
 10.3239 -18.2869    4.6  50.9 -135.6   7.6398   2.5 ------	UNKNOWN