Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Thu Mar 17 18:46:57 EDT 2016
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger672236
======================================================================

  Trigger: 00672236      Segment: 000

  BAT Trigger Time: 475921247.744   [s; MET]
      Trigger Stop: 475921248.768   [s; MET]
               UTC: 2016-01-31T08:20:31.969040    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 78.1817178167953   Dec: -7.06755751563068  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.32
     Image Trigger?:     NO
     Rate S/N Ratio:     11.6619037896906  [ if not an image trigger ]
     Image S/N Ratio:    7.32

  Analysis Position:   [ source = BAT ]
    RA: 78.1817178167953   Dec: -7.06755751563068  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 78.1685449857049   Dec: -7.03847058064275  [deg; J2000]  
        { 05h 12m 40.5s , -07d 02' 18.5" }
         +/- 1.08535062368957 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.380568137913955 [arcmin] (formal 1-sigma fit error)
    SNR: 27.0585181131645
 
  Angular difference between the analysis and refined position is 1.913386 arcmin
 
  Partial Coding Fraction: 0.6484375    [ including projection effects ]

  Duration
     T90: 327.751999974251 +/- 71.029021038502
        Measured from: 12.8079999685287
                   to: 340.55999994278     [s; relative to TRIGTIME]
     T50: 64.3879999518394 +/- 5.0269799927161
        Measured from: 21.0239999890327
                   to: 85.4119999408722     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 15.972000002861     
                   to: 16.972000002861     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -1.49200004339218     
                   to: 773.032000005245     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     6.899761  10.672348   9.534881   3.253039
           0.198139   0.209287   0.185796   0.160217 [error]
 Peak      0.155088   0.280972   0.279466   0.118139
           0.011451   0.014370   0.014797   0.012332 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  774.524   -1.492  773.032
T90   327.752   12.808  340.560
T50    64.388   21.024   85.412
Peak    1.000   15.972   16.972
 
 
====== 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      -1.212    -0.045      0.046       -           -               -         2.57e-03     -6.08e-05          6.07e-05      54.430   57
CPL     -1.209    -0.044      0.048     9999.360    -9999.360      -9999.360      2.58e-03     -5.91e-05          2.37e-04      54.540   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      -1.069     -0.097     0.098       -           -               -         5.49e-02     -2.98e-03          2.98e-03      42.620   57
CPL     -1.000     -0.239     0.325      794.234    -794.234      -794.234      5.92e-02     -6.94e-03          2.35e-02      42.650   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   1.94e-06  4.26e-06  7.35e-06  2.94e-05  2.01e-05  4.30e-05   erg/cm2
      90%_error_low -1.01e-07 -1.28e-07 -1.92e-07 -1.83e-06 -4.89e-07 -1.90e-06   erg/cm2
      90%_error_hi   1.03e-07  1.28e-07  1.92e-07  1.92e-06  4.90e-07  1.98e-06   erg/cm2
Peak flux       PL   6.10e-04  6.17e-03  6.74e-02  7.58e+00  2.99e-01  7.60e+00   ph/cm2/s
      90%_error_low -2.52e-05     N/A       N/A   -4.43e-01     N/A   -3.71e-01   ph/cm2/s
      90%_error_hi   7.58e-05     N/A       N/A    4.54e-01     N/A    5.49e-01   ph/cm2/s
 
Fluence        CPL   1.94e-06  4.26e-06  7.29e-06  2.92e-05  2.02e-05  4.30e-05   erg/cm2
      90%_error_low    N/A    -1.29e-07    N/A       N/A    -5.95e-07 -4.25e-06   erg/cm2
      90%_error_hi     N/A     1.28e-07    N/A       N/A     3.84e-07  6.85e-07   erg/cm2
Peak flux      CPL   1.50e+00  1.95e+00  1.86e+00  3.04e+00  6.34e+00  8.41e+00   ph/cm2/s
      90%_error_low -2.06e-01 -1.33e-01 -1.26e-01 -1.05e+00 -3.50e-01 -1.15e+00   ph/cm2/s
      90%_error_hi   1.28e-01  1.29e-01  1.42e-01  3.56e-01  3.63e-01  5.13e-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
   78.1685    -7.0385   0.0071    23.7670   -92.9450         1.9697471     27.059 TRIG_00672236                 
 
Foreground time interval of the image:
 -1.492  13.557 (delta_t =  15.049 [sec])
Background time interval of the image:
-239.744  -1.492 (delta_t = 238.252 [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   -1.492 sec. to  773.032 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.21193     ( -0.0453108   0.0455391 )
Norm@50keV  : 2.56990E-03    ( -6.08443e-05   6.07313e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.43 using 59 PHA bins.
# Reduced chi-squared =         0.9549 for     57 degrees of freedom 
# Null hypothesis probability =   5.721771e-01
 
Photon flux (15-150 keV)    in 774.5 sec: 0.302172 ( -0.007807  0.00784 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.0128e-05 ( -4.89376e-07  4.90216e-07 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -1.492 sec. to  773.032 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.20944     ( -0.0437552   0.0478891 )
Epeak [keV] : 9999.36      ( -9999.36 -9999.36 )
Norm@50keV  : 2.58082E-03    ( -6.05887e-05   0.000235772 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.54 using 59 PHA bins.
# Reduced chi-squared =         0.9739 for     56 degrees of freedom 
# Null hypothesis probability =   5.302476e-01
 
Photon flux (15-150 keV)    in 774.5 sec: 0.304470 ( -0.010203  0.005433 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.02279e-05 ( -5.95164e-07  3.8366e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from   15.972 sec. to   16.972 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.0695     ( -0.0972536   0.0977638 )
Norm@50keV  : 5.48944E-02    ( -0.00297656   0.00297655 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          42.62 using 59 PHA bins.
# Reduced chi-squared =         0.7477 for     57 degrees of freedom 
# Null hypothesis probability =   9.217109e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.299354 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.79709e-07 ( -3.63211e-08  3.6517e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   15.972 sec. to   16.972 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.06432     ( -0.235603   0.328591 )
Epeak [keV] : 9998.11      ( -9998.02 -9998.02 )
Norm@50keV  : 5.52024E-02    ( -0.00299326   0.0274489 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          42.61 using 59 PHA bins.
# Reduced chi-squared =         0.7609 for     56 degrees of freedom 
# Null hypothesis probability =   9.063104e-01
 
Photon flux (15-150 keV)    in 1 sec: 6.34267 ( -0.35024  0.36289 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.78709e-07 ( -3.99928e-08  3.84968e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 327.752 sec.
Hardness ratio (energy fluence ratio) = 1.72679174487

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

    S(15-50 keV)  = 6.19937e-06
S(50-150 keV) = 1.392887e-05

    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 = -2.262474928634723E-02, IMY = 4.397838829652273E-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:
-239.744000 -1.492000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6333  22.0204    0.3  21.5  -10.0  10.2836  40.6    0.4	Crab                          
137.7041 -12.9898    2.9  43.5  145.4   2.8604   4.0 ------	UNKNOWN                       
119.3974 -12.5314    3.2  28.0  160.7   1.0571   3.6 ------	UNKNOWN                       
 66.8802  -6.3287    2.4  33.5  -81.2   2.1750   4.8 ------	UNKNOWN                       
 54.3359   5.2262    3.1  43.6  -59.0   4.0934   3.7 ------	UNKNOWN                       
 46.2003  17.8106    3.7  52.1  -42.4   4.4166   3.2 ------	UNKNOWN

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

    Time interval of the image:
-1.492000 13.556590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.4390  22.0740    6.8  21.6  -10.3  -0.0953  -1.7   11.4	Crab                          
134.7125  20.4425    2.8  38.3   93.6   0.8650   4.0 ------	UNKNOWN                       
120.6399  25.5193    1.9  29.1   74.6   0.5340   6.1 ------	UNKNOWN                       
112.3852   5.2936    2.1  14.1  121.0   0.3093   5.5 ------	UNKNOWN                       
 62.4669  40.0264    2.1  46.9   -8.2   0.5231   5.4 ------	UNKNOWN                       
 59.5657  29.1803    2.8  43.3  -23.1   0.3628   4.1 ------	UNKNOWN                       
 78.1686  -7.0385    0.4  23.8  -92.9   1.9695  27.0 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
58.956600 596.256590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6467  22.0133    0.4  29.5   35.5  21.7736  31.7    0.8	Crab                          
117.5304 -21.1441    2.0  40.5  139.7   8.0959   5.7 ------	UNKNOWN                       
115.6033 -53.2756    3.3  55.3  179.0  10.1326   3.4 ------	UNKNOWN                       
 78.1886  -7.0450    0.6   0.0  -65.9  10.1667  19.1 ------	UNKNOWN                       
 29.7844  13.0531    3.7  52.1  -42.2  11.5276   3.1 ------	UNKNOWN