Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Tue Jun 21 11:02:28 EDT 2016
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger688452
======================================================================

  Trigger: 00688452      Segment: 000

  BAT Trigger Time: 486484998.776   [s; MET]
      Trigger Stop: 486484998.84   [s; MET]
               UTC: 2016-06-01T14:43:02.422720    [includes UTCF correction] 
       Where From?: (*SHORT BURST*) TDRSS scaled map message

  BAT 
    RA: 235.033918410918   Dec: 64.4946031295717  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.25
     Image Trigger?:     NO
     Rate S/N Ratio:     32.2955105239103  [ if not an image trigger ]
     Image S/N Ratio:    7.25

  Analysis Position:   [ source = BAT ]
    RA: 235.033918410918   Dec: 64.4946031295717  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 234.924492779546   Dec: 64.528563546378  [deg; J2000]  
        { 15h 39m 41.9s , +64d 31' 42.8" }
         +/- 1.81602265889292 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.731365658551343 [arcmin] (formal 1-sigma fit error)
    SNR: 12.970154431687
 
  Angular difference between the analysis and refined position is 3.483454 arcmin
 
  Partial Coding Fraction: 0.6640625    [ including projection effects ]

  Duration
     T90: 0.119999945163727 +/- 0.0226274207069314
        Measured from: -0.0120000243186951
                   to: 0.107999920845032     [s; relative to TRIGTIME]
     T50: 0.0559999346733093 +/- 0.0200000405311584
        Measured from: 0.0199999809265137
                   to: 0.075999915599823     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.450000047683716     
                   to: 0.549999952316284     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.0240000486373901     
                   to: 0.120000004768372     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.018239   0.032260   0.032931   0.012618
           0.003680   0.004248   0.004366   0.003604 [error]
 Peak      0.019563   0.041073   0.040290   0.011953
           0.007613   0.008023   0.007337   0.006300 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    0.144   -0.024    0.120
T90     0.120   -0.012    0.108
T50     0.056    0.020    0.076
Peak    1.000   -0.450    0.550
 
 
====== 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      -0.977    -0.242      0.248       -           -               -         4.12e-02     -5.89e-03          5.88e-03      59.210   57
CPL     -0.573    -0.529      0.962      209.369    -209.369      -209.369      6.17e-02     -6.17e-02          -5.28e-02      58.450   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      -0.902     -0.339     0.365       -           -               -         8.02e-03     -1.62e-03          1.59e-03      65.720   57
CPL     -0.449     -0.732     1.622      214.220    -214.220      -214.220      1.22e-02     -5.56e-03          3.36e-02      65.310   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   4.65e-09  1.18e-08  2.40e-08  1.23e-07  6.47e-08  1.63e-07   erg/cm2
      90%_error_low -1.23e-09 -1.99e-09 -3.95e-09 -3.98e-08 -1.03e-08 -4.28e-08   erg/cm2
      90%_error_hi   1.34e-09  1.95e-09  3.89e-09  5.13e-08  1.04e-08  5.29e-08   erg/cm2
Peak flux       PL   1.87e-01  2.69e-01  2.88e-01  5.72e-01  9.21e-01  1.31e+00   ph/cm2/s
      90%_error_low -7.37e-02 -7.12e-02 -5.74e-02 -2.17e-01 -1.84e-01 -2.69e-01   ph/cm2/s
      90%_error_hi   8.72e-02  6.97e-02  5.68e-02  2.96e-01  1.86e-01  2.90e-01   ph/cm2/s
 
Fluence        CPL   4.19e-09  1.21e-08  2.52e-08  7.55e-08  6.39e-08  1.17e-07   erg/cm2
      90%_error_low -1.52e-09 -2.13e-09 -4.57e-09 -4.62e-08 -1.07e-08 -4.72e-08   erg/cm2
      90%_error_hi   1.60e-09  2.18e-09  4.75e-09  9.52e-08  1.07e-08  9.06e-08   erg/cm2
Peak flux      CPL   1.61e-01  2.70e-01  3.04e-01  3.91e-01  9.00e-01  1.12e+00   ph/cm2/s
      90%_error_low -9.40e-02 -7.88e-02 -6.85e-02 -2.43e-01 -1.93e-01 -3.32e-01   ph/cm2/s
      90%_error_hi   1.05e-01  7.52e-02  7.33e-02  3.57e-01  1.93e-01  3.93e-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
  234.9245    64.5286   0.0148    25.8715   144.6222         0.1055209     12.970 TRIG_00688452                 
 
Foreground time interval of the image:
 -0.024   0.120 (delta_t =   0.144 [sec])
Background time interval of the image:
-239.776  -0.024 (delta_t = 239.752 [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   -0.024 sec. to    0.120 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.976781     ( -0.242403   0.247537 )
Norm@50keV  : 4.11888E-02    ( -0.00588858   0.00588095 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.21 using 59 PHA bins.
# Reduced chi-squared =          1.039 for     57 degrees of freedom 
# Null hypothesis probability =   3.949864e-01
 
Photon flux (15-150 keV)    in 0.144 sec: 4.73678 ( -0.68242  0.68313 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.46803e-08 ( -1.03437e-08  1.04357e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -0.024 sec. to    0.120 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.52379     ( -0.527919   0.962364 )
Epeak [keV] : 157.671      ( -209.597 -209.597 )
Norm@50keV  : 2.36340E-03    ( -0.00236104   0.00650272 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.97 using 59 PHA bins.
# Reduced chi-squared =          1.017 for     56 degrees of freedom 
# Null hypothesis probability =   4.388540e-01
 
Photon flux (15-150 keV)    in 0.144 sec: 4.67350 ( -0.69506  0.69432 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.38767e-08 ( -1.07329e-08  1.06776e-08 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from   -0.450 sec. to    0.550 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.902341     ( -0.338577   0.365452 )
Norm@50keV  : 8.02060E-03    ( -0.00162283   0.0015911 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.72 using 59 PHA bins.
# Reduced chi-squared =          1.153 for     57 degrees of freedom 
# Null hypothesis probability =   2.004395e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.920598 ( -0.183977  0.185562 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.99415e-08 ( -1.81257e-08  1.82542e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -0.450 sec. to    0.550 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.449488     ( -0.730662   1.62291 )
Epeak [keV] : 214.220      ( -214.495 -214.495 )
Norm@50keV  : 1.22002E-02    ( -0.00554554   0.0336086 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.31 using 59 PHA bins.
# Reduced chi-squared =          1.166 for     56 degrees of freedom 
# Null hypothesis probability =   1.847799e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.899938 ( -0.192685  0.193182 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.86258e-08 ( -1.878e-08  1.8699e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 0.1199999 sec.
Hardness ratio (energy fluence ratio) = 2.03249692217

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

    S(15-50 keV)  = 1.6444464e-08
S(50-150 keV) = 4.823535e-08

    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 = -3.954131698522780E-01, IMY = -2.807748559407163E-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:
-239.776000 -0.024000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.6127  35.2014    1.0  41.3   53.5   8.0354  11.6    1.1	Cyg X-1                       
308.0865  40.9908    1.9  35.1   43.2   2.3173   6.1    2.5	Cyg X-3                       
326.0736  38.4489    4.0  38.2   20.1   1.0346   2.9    8.9	Cyg X-2                       
  9.5877  25.7938    2.9  57.5  -26.3   4.8436   4.0 ------	UNKNOWN                       
 61.2704  55.5999    2.9  40.9  -87.3   4.0492   3.9 ------	UNKNOWN

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

    Time interval of the image:
-0.024000 0.120000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.4667  35.1232   31.8  41.4   53.7   0.0075   0.4    7.7	Cyg X-1                       
308.1906  41.0287    3.6  35.1   43.1   0.0391   3.2    5.8	Cyg X-3                       
326.0139  38.2916    3.6  38.3   20.2   0.0320   3.2    7.6	Cyg X-2                       
208.1963  49.0437    2.1  45.9  155.8   0.0980   5.4 ------	UNKNOWN                       
234.9245  64.5286    0.9  25.9  144.6   0.1055  13.0 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
57.724600 694.724600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4597  35.3370   27.0  31.4   72.7   0.2672   0.4    0.3	Her X-1                       
299.5756  35.1904    0.7  47.8   19.4  15.0901  16.0    1.0	Cyg X-1                       
308.2088  40.9587    4.6  46.7    7.4   1.7398   2.5    4.5	Cyg X-3                       
326.2690  38.2950    5.6  56.5   -5.7  -2.9081  -2.1    4.9	Cyg X-2                       
180.7149  23.0976    2.7  54.2  171.2   6.9920   4.2 ------	UNKNOWN                       
179.9050  31.1864    3.5  47.3  176.7   2.7678   3.3 ------	UNKNOWN                       
159.8498  29.1873    5.0  57.6 -165.4   5.2906   2.3 ------	UNKNOWN                       
153.3210  64.8791    2.8  32.5 -127.4   2.0082   4.1 ------	UNKNOWN                       
341.7000  46.4878    2.3  55.3  -22.6   6.1999   5.1 ------	UNKNOWN                       
348.1621  59.6129    3.1  46.1  -35.8   2.7496   3.8 ------	UNKNOWN                       
140.0827  45.4785    3.5  51.9 -138.6   6.8679   3.3 ------	UNKNOWN