Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Sun Mar 20 23:23:31 EDT 2016
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger676423
======================================================================

  Trigger: 00676423      Segment: 000

  BAT Trigger Time: 478294344   [s; MET]
      Trigger Stop: 478294416   [s; MET]
               UTC: 2016-02-27T19:32:08.096040    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 194.788571324558   Dec: 78.6392014846058  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.02
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    7.02

  Analysis Position:   [ source = BAT ]
    RA: 194.788571324558   Dec: 78.6392014846058  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 195.059174407585   Dec: 78.6685120054544  [deg; J2000]  
        { 13h 00m 14.2s , +78d 40' 06.6" }
         +/- 2.97376821924807 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.34383552293449 [arcmin] (formal 1-sigma fit error)
    SNR: 6.41158430887127
 
  Angular difference between the analysis and refined position is 3.646356 arcmin
 
  Partial Coding Fraction: 0.5078125    [ including projection effects ]

  Duration
     T90: 316.347999989986 +/- 75.7592504173685
        Measured from: -92.8080000281334
                   to: 223.539999961853     [s; relative to TRIGTIME]
     T50: 175.111999988556 +/- 14.1224678947954
        Measured from: 23.9279999732971
                   to: 199.039999961853     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 198.839999973774     
                   to: 199.839999973774     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -99.3880000114441     
                   to: 236.963999986649     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.410156   2.282590   1.494348   0.364893
           0.108258   0.112514   0.096859   0.080193 [error]
 Peak      0.011925   0.028957   0.033011   0.010485
           0.004695   0.005094   0.004449   0.003599 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  336.352  -99.388  236.964
T90   316.348  -92.808  223.540
T50   175.112   23.928  199.040
Peak    1.000  198.840  199.840
 
 
====== 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: 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      -1.549    -0.103      0.102       -           -               -         1.05e-03     -6.52e-05          6.49e-05      59.220   57
CPL     -0.753    -0.455      0.509       75.534     -13.405        37.857      2.72e-03     -1.12e-03          2.22e-03      49.650   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      -1.023     -0.265     0.278       -           -               -         5.33e-03     -9.21e-04          9.17e-04      55.670   57
CPL      1.991     -1.936     3.430       73.724     -12.767        34.211      1.15e-01     -1.15e-01          2.78e+00      47.030   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   4.74e-07  8.45e-07  1.16e-06  3.27e-06  3.34e-06  5.74e-06   erg/cm2
      90%_error_low -4.66e-08 -5.25e-08 -9.25e-08 -5.20e-07 -2.23e-07 -6.02e-07   erg/cm2
      90%_error_hi   4.78e-08  5.24e-08  9.25e-08  5.82e-07  2.25e-07  6.52e-07   erg/cm2
Peak flux       PL   1.39e-01  1.86e-01  1.83e-01  3.24e-01  6.15e-01  8.33e-01   ph/cm2/s
      90%_error_low -4.35e-02 -3.94e-02 -3.31e-02 -1.05e-01 -1.08e-01 -1.48e-01   ph/cm2/s
      90%_error_hi   4.87e-02  3.89e-02  3.29e-02  1.33e-01  1.09e-01  1.53e-01   ph/cm2/s
 
Fluence        CPL   4.19e-07  9.17e-07  1.19e-06  1.10e-06  3.12e-06  3.63e-06   erg/cm2
      90%_error_low -5.55e-08 -6.68e-08 -1.03e-07 -4.60e-07 -2.52e-07 -5.19e-07   erg/cm2
      90%_error_hi   5.63e-08  6.84e-08  1.04e-07  8.51e-07  2.54e-07  8.66e-07   erg/cm2
Peak flux      CPL   6.10e-02  2.05e-01  2.31e-01  5.29e-02  5.43e-01  5.50e-01   ph/cm2/s
      90%_error_low -4.31e-02 -5.44e-02 -4.51e-02 -3.79e-02 -1.17e-01 -1.23e-01   ph/cm2/s
      90%_error_hi   6.20e-02  5.20e-02  4.67e-02  8.84e-02  1.19e-01  1.40e-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
  195.0592    78.6685   0.0299    27.1342   -82.6857         1.6833534      6.412 TRIG_00676423                 
 
Foreground time interval of the image:
-99.388  93.301 (delta_t = 192.689 [sec])
Background time interval of the image:
-239.000 -99.388 (delta_t = 139.612 [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  -99.388 sec. to  236.964 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.54878     ( -0.103006   0.102331 )
Norm@50keV  : 1.05383E-03    ( -6.51611e-05   6.49376e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.22 using 59 PHA bins.
# Reduced chi-squared =          1.039 for     57 degrees of freedom 
# Null hypothesis probability =   3.944151e-01
 
Photon flux (15-150 keV)    in 336.4 sec: 0.133366 ( -0.008133  0.008142 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.33838e-06 ( -2.23039e-07  2.247e-07 ) ergs/cm2
    Cutoff power-law model
    Time interval is from  -99.388 sec. to  236.964 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.75315     ( -0.455087   0.509432 )
Epeak [keV] : 75.5337      ( -13.4052 37.8574 )
Norm@50keV  : 2.72069E-03    ( -0.00112147   0.00222029 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.65 using 59 PHA bins.
# Reduced chi-squared =         0.8866 for     56 degrees of freedom 
# Null hypothesis probability =   7.124253e-01
 
Photon flux (15-150 keV)    in 336.4 sec: 0.128590 ( -0.008568  0.008564 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.12245e-06 ( -2.51701e-07  2.5435e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from  198.840 sec. to  199.840 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.02255     ( -0.265029   0.278247 )
Norm@50keV  : 5.33386E-03    ( -0.000921252   0.000917307 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.67 using 59 PHA bins.
# Reduced chi-squared =         0.9767 for     57 degrees of freedom 
# Null hypothesis probability =   5.249357e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.614868 ( -0.107951  0.108527 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.72308e-08 ( -1.0263e-08  1.03386e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from  198.840 sec. to  199.840 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.99129     ( -1.97068   3.39522 )
Epeak [keV] : 73.7237      ( -12.4783 34.501 )
Norm@50keV  : 0.114795    ( -0.121567   2.77022 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          47.03 using 59 PHA bins.
# Reduced chi-squared =         0.8399 for     56 degrees of freedom 
# Null hypothesis probability =   7.976906e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.543063 ( -0.116844  0.119272 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.87663e-08 ( -1.09917e-08  1.17274e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 316.348 sec.
Hardness ratio (energy fluence ratio) = 1.29771728906

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

    S(15-50 keV)  = 1.3364973e-06
S(50-150 keV) = 1.785983e-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 = 6.524524203051942E-02, IMY = 5.083099097321186E-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:
-239.000000 -99.388000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
105.9511  21.1545    2.8  54.5  161.7   2.9055   4.2 ------	UNKNOWN                       
281.8737  81.3013    2.0  41.0  -83.6   3.1998   5.7 ------	UNKNOWN

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

    Time interval of the image:
-99.388000 93.300590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
192.0037  26.8091    2.5  33.8   36.2   1.2458   4.6 ------	UNKNOWN                       
195.0570  78.6771    1.6  27.1  -82.7   1.8476   7.0 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
141.100600 963.087400
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4638  35.3505    1.5  49.6  -13.5   5.4074   7.9    0.6	Her X-1                       
219.9736  42.4195    2.2  37.5   23.1   2.3928   5.3 ------	UNKNOWN                       
203.9956  65.1709    3.4  13.7   37.7   1.0316   3.4 ------	UNKNOWN                       
 79.9091  41.4247    3.7  54.1  177.1   4.1985   3.1 ------	UNKNOWN                       
194.7248  78.6615    1.2   0.0 -123.2   3.3293   9.8 ------	UNKNOWN                       
272.4950  47.9191    2.9  40.9  -36.4   2.1210   3.9 ------	UNKNOWN                       
 31.1530  48.6361    3.6  52.4 -139.4   7.3912   3.2 ------	UNKNOWN                       
 18.6738  53.3704    3.4  48.0 -128.9   6.6463   3.4 ------	UNKNOWN