Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Sat Oct  4 23:54:38 EDT 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger594081
======================================================================

  Trigger: 00594081      Segment: 000

  BAT Trigger Time: 417937800   [s; MET]
      Trigger Stop: 417938120   [s; MET]
               UTC: 2014-03-31T05:49:48.173160    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 134.844638913522   Dec: 2.7069009242252  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     NO    [ by BAT flight software ]
     Image S/N Ratio:    7.74
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    7.74

  Analysis Position:   [ source = BAT ]
    RA: 134.844638913522   Dec: 2.7069009242252  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 134.845   Dec: 2.7069  [deg; J2000]
        { 08h 59m 22.8s , +02d 42' 24.8" }
        +/- 2.66726357538 [arcmin] (estimated 90% radius based on SNR)
    SNR: 7.49047876878
 
 
  Angular difference between the analysis and refined position is 0.021641 arcmin
 
  Partial Coding Fraction: 0.984375    [ including projection effects ]

  Duration
     T90: 209.655999958515 +/- 32.7518243973476
        Measured from: 91.1679999828339
                   to: 300.823999941349     [s; relative to TRIGTIME]
     T50: 75.3319999575615 +/- 61.6366541549359
        Measured from: 158.772000014782
                   to: 234.103999972343     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 188.523999989033     
                   to: 189.523999989033     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 72.0720000267029     
                   to: 321.167999982834     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.556618   0.574071   0.305876   0.037949
           0.076096   0.077855   0.067586   0.058168 [error]
 Peak      0.011352   0.012668   0.002277   0.012761
           0.005020   0.004850   0.004347   0.003897 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  249.096   72.072  321.168
T90   209.656   91.168  300.824
T50    75.332  158.772  234.104
Peak    1.000  188.524  189.524
 
 
====== 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      -1.961    -0.304      0.280       -           -               -         3.11e-04     -6.46e-05          6.27e-05      65.010   57
CPL     -1.418    -0.931      1.795       40.599      N/A           N/A         6.74e-04        N/A               N/A         64.420   56
 
 
=== 1-s peak 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      -1.378     -0.982     1.299       -           -               -         1.86e-03     -9.53e-04          8.97e-04      61.570   57
CPL     -1.413      1.413     2.000     9999.360      N/A           N/A         1.85e-03        N/A               N/A         61.580   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   1.53e-07  2.12e-07  2.18e-07  4.09e-07  7.13e-07  9.92e-07   erg/cm2
      90%_error_low -3.10e-08 -3.35e-08 -5.96e-08 -1.83e-07 -1.38e-07 -2.62e-07   erg/cm2
      90%_error_hi   3.16e-08  3.32e-08  6.26e-08  2.66e-07  1.44e-07  3.29e-07   erg/cm2
Peak flux       PL   6.80e-02  7.36e-02  5.66e-02  7.12e-02  2.25e-01  2.69e-01   ph/cm2/s
      90%_error_low -5.59e-02 -7.36e-02 -5.66e-02 -7.12e-02 -2.25e-01 -1.31e-01   ph/cm2/s
      90%_error_hi   6.36e-02  3.74e-02  3.50e-02  2.09e-01  1.08e-01  1.50e-01   ph/cm2/s
 
Fluence        CPL   1.50e-07  2.27e-07  2.04e-07  1.37e-07  6.60e-07  7.18e-07   erg/cm2
      90%_error_low -3.29e-08 -3.40e-08 -9.39e-08    N/A    -1.66e-07 -2.23e-07   erg/cm2
      90%_error_hi   3.28e-08  4.97e-08  7.19e-08    N/A     1.69e-07  4.50e-07   erg/cm2
Peak flux      CPL   7.19e-02  7.32e-02  5.49e-02  6.85e-02  2.30e-01  2.66e-01   ph/cm2/s
      90%_error_low -6.01e-02 -1.32e-02 -3.39e-02 -6.85e-02 -2.30e-01 -2.66e-01   ph/cm2/s
      90%_error_hi   6.06e-02  1.05e-01  3.70e-02  2.08e-01  1.04e-01  1.25e-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
134.845 2.707 0.000 9.049 48.365 1.052 7.490 TRIG_00594081
 
Image time interval: 0.000 to 320.000 [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   72.072 sec. to  321.168 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.96144     ( -0.303713   0.280467 )
Norm@50keV  : 3.10997E-04    ( -6.46295e-05   6.27232e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.01 using 59 PHA bins.
# Reduced chi-squared =          1.140 for     57 degrees of freedom 
# Null hypothesis probability =   2.178893e-01
 
Photon flux (15-150 keV)    in 249.1 sec: 4.58448E-02 ( -0.0070037  0.0070047 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.13318e-07 ( -1.37966e-07  1.43964e-07 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   72.072 sec. to  321.168 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.41789     ( -0.931537   1.79487 )
Epeak [keV] : 40.5990      (   )
Norm@50keV  : 6.74474E-04    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.42 using 59 PHA bins.
# Reduced chi-squared =          1.150 for     56 degrees of freedom 
# Null hypothesis probability =   2.057665e-01
 
Photon flux (15-150 keV)    in 249.1 sec: 4.49757E-02 ( -0.0072314  0.0072525 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.59819e-07 ( -1.66459e-07  1.69008e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from  188.524 sec. to  189.524 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.37838     ( -0.982387   1.29892 )
Norm@50keV  : 1.85625E-03    ( -0.000953493   0.000897327 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.57 using 59 PHA bins.
# Reduced chi-squared =          1.080 for     57 degrees of freedom 
# Null hypothesis probability =   3.158105e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.224974 ( -0.224974  0.108294 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.80202e-08 ( -9.68646e-09  1.05794e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from  188.524 sec. to  189.524 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.40911     ( 2.40888   2.99556 )
Epeak [keV] : 136.104      (   )
Norm@50keV  : 4.66063E-04    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.03 using 59 PHA bins.
# Reduced chi-squared =          1.090 for     56 degrees of freedom 
# Null hypothesis probability =   2.999445e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.230215 ( -0.230215  0.103772 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.78916e-08 ( -1.31377e-08  -4.18657e-09 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 209.656 sec.
Hardness ratio (energy fluence ratio) = 1.0271170054

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

    S(15-50 keV)  = 3.65082e-07
S(50-150 keV) = 3.482444e-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 = 0.105812201967, IMY = -0.119034623563

    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:
-10.899410 72.072000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.6812 -40.5209    7.6  37.0  178.2   0.1896   1.5    7.2	Vela X-1                      
 86.9262  18.0486    3.0  46.9  -53.6   1.6012   3.9 ------	UNKNOWN

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

    Time interval of the image:
72.072000 321.168000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.7068 -40.6832   69.5  37.1  178.3   0.0667   0.2   11.2	Vela X-1                      
144.9291  -5.8283    2.2  16.1  103.8   1.5385   5.2 ------	UNKNOWN                       
134.8907   2.7534    2.0   9.1   48.4   1.6352   5.7 ------	UNKNOWN                       
102.0040  29.0213    2.2  42.0  -29.3   2.4399   5.2 ------	UNKNOWN                       
106.1504 -29.8722    2.4  33.6 -135.8   1.8173   4.9 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
372.900600 963.053700
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.4608 -40.5547    4.7  43.3  172.6   1.4395   2.4    3.1	Vela X-1                      
131.2307 -32.2488    2.9  35.1  178.6   1.7469   4.0 ------	UNKNOWN                       
118.6346   5.5043    2.1  16.4  -86.4   1.7534   5.3 ------	UNKNOWN                       
107.7163 -10.1459    2.7  29.9 -122.6   1.7677   4.3 ------	UNKNOWN                       
 94.5323  12.4708    2.2  41.1  -80.8   8.0827   5.3 ------	UNKNOWN