Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Sun Nov  1 11:54:52 EST 2015
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger657750
======================================================================

  Trigger: 00657750      Segment: 000

  BAT Trigger Time: 465818117.12   [s; MET]
      Trigger Stop: 465818118.144   [s; MET]
               UTC: 2015-10-06T09:55:01.886520    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 147.451471925599   Dec: 70.5086429872937  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    16.58
     Image Trigger?:     NO
     Rate S/N Ratio:     47.1911008559877  [ if not an image trigger ]
     Image S/N Ratio:    16.58

  Analysis Position:   [ source = BAT ]
    RA: 147.451471925599   Dec: 70.5086429872937  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 147.425929889126   Dec: 70.5080913974938  [deg; J2000]  
        { 09h 49m 42.2s , +70d 30' 29.1" }
         +/- 0.598625350611065 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.10624160700868 [arcmin] (formal 1-sigma fit error)
    SNR: 63.3094048407045
 
  Angular difference between the analysis and refined position is 0.512425 arcmin
 
  Partial Coding Fraction: 1.015625    [ including projection effects ]

  Duration
     T90: 211.056000053883 +/- 39.073553623331
        Measured from: -1.66400003433228
                   to: 209.39200001955     [s; relative to TRIGTIME]
     T50: 56.432000041008 +/- 3.09297010216753
        Measured from: 6
                   to: 62.432000041008     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 1.69999998807907     
                   to: 2.69999998807907     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -4.83200001716614     
                   to: 311.296000003815     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     3.499086   4.353225   3.437586   0.933089
           0.105077   0.110440   0.098203   0.089408 [error]
 Peak      0.084977   0.135631   0.105922   0.018926
           0.006987   0.008109   0.007563   0.006100 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  316.128   -4.832  311.296
T90   211.056   -1.664  209.392
T50    56.432    6.000   62.432
Peak    1.000    1.700    2.700
 
 
====== 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      -1.501    -0.060      0.060       -           -               -         2.41e-03     -7.34e-05          7.33e-05      43.960   57
CPL     -1.471    -0.085      0.199      939.528    -939.528      -939.528      2.49e-03     -1.46e-04          5.70e-04      44.020   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      -1.384     -0.116     0.115       -           -               -         2.20e-02     -1.56e-03          1.55e-03      71.660   57
CPL     -0.828     -0.469     0.527      101.763     -28.898       241.659      4.30e-02     -1.82e-02          3.71e-02      67.470   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   9.72e-07  1.79e-06  2.52e-06  7.50e-06  7.22e-06  1.28e-05   erg/cm2
      90%_error_low -5.82e-08 -6.12e-08 -9.99e-08 -6.63e-07 -2.38e-07 -7.23e-07   erg/cm2
      90%_error_hi   5.95e-08  6.09e-08  9.96e-08  7.08e-07  2.39e-07  7.60e-07   erg/cm2
Peak flux       PL   8.11e-01  8.74e-01  6.70e-01  8.39e-01  2.67e+00  3.19e+00   ph/cm2/s
      90%_error_low -9.15e-02 -6.32e-02 -5.95e-02 -1.41e-01 -1.83e-01 -2.31e-01   ph/cm2/s
      90%_error_hi   9.42e-02  6.29e-02  5.92e-02  1.58e-01  1.83e-01  2.34e-01   ph/cm2/s
 
Fluence        CPL   9.73e-07  1.79e-06  2.52e-06  7.52e-06  7.22e-06  1.28e-05   erg/cm2
      90%_error_low -5.97e-08 -5.14e-08 -9.98e-08 -2.30e-06 -2.75e-07 -2.14e-06   erg/cm2
      90%_error_hi   6.77e-08  3.32e-08  1.07e-07  7.20e-07  2.34e-07  3.91e-07   erg/cm2
Peak flux      CPL   7.45e-01  9.28e-01  6.95e-01  4.34e-01  2.62e+00  2.80e+00   ph/cm2/s
      90%_error_low -1.07e-01 -7.80e-02 -6.57e-02 -1.78e-01 -1.90e-01 -2.64e-01   ph/cm2/s
      90%_error_hi   1.09e-01  8.00e-02  6.67e-02  3.19e-01  1.89e-01  3.48e-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
  147.4259    70.5081   0.0030     1.5516   118.8398         4.7144720     63.309 TRIG_00657750                 
 
Foreground time interval of the image:
 -4.832  13.381 (delta_t =  18.213 [sec])
Background time interval of the image:
-239.120  -4.832 (delta_t = 234.288 [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   -4.832 sec. to  311.296 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.50078     ( -0.0598692   0.0596992 )
Norm@50keV  : 2.40760E-03    ( -7.33652e-05   7.33105e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          43.96 using 59 PHA bins.
# Reduced chi-squared =         0.7712 for     57 degrees of freedom 
# Null hypothesis probability =   8.971696e-01
 
Photon flux (15-150 keV)    in 316.1 sec: 0.300633 ( -0.009824  0.009864 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.21963e-06 ( -2.38197e-07  2.38922e-07 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -4.832 sec. to  311.296 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.47105     ( -0.0561833   0.227132 )
Epeak [keV] : 939.528      ( -9999.35 -9999.35 )
Norm@50keV  : 2.48719E-03    ( -7.34498e-05   0.000642959 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          44.02 using 59 PHA bins.
# Reduced chi-squared =         0.7862 for     56 degrees of freedom 
# Null hypothesis probability =   8.769420e-01
 
Photon flux (15-150 keV)    in 316.1 sec: 0.300703 ( -0.011036  0.009767 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.22127e-06 ( -2.75277e-07  2.3436e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from    1.700 sec. to    2.700 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.38422     ( -0.115982   0.115197 )
Norm@50keV  : 2.20194E-02    ( -0.00155886   0.00155261 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          71.66 using 59 PHA bins.
# Reduced chi-squared =          1.257 for     57 degrees of freedom 
# Null hypothesis probability =   9.153157e-02
 
Photon flux (15-150 keV)    in 1 sec: 2.67214 ( -0.18325  0.1833 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.13491e-07 ( -1.70736e-08  1.72422e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from    1.700 sec. to    2.700 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.827513     ( -0.468925   0.527111 )
Epeak [keV] : 101.763      ( -28.9011 241.656 )
Norm@50keV  : 4.30238E-02    ( -0.018208   0.0371095 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          67.47 using 59 PHA bins.
# Reduced chi-squared =          1.205 for     56 degrees of freedom 
# Null hypothesis probability =   1.400961e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.61641 ( -0.1898  0.18937 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.03007e-07 ( -1.93616e-08  1.94213e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 211.056 sec.
Hardness ratio (energy fluence ratio) = 1.41348083237

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

    S(15-50 keV)  = 2.7586246e-06
S(50-150 keV) = 4.461022e-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 = -1.306597232928468E-02, IMY = -2.372788338045695E-02

    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:
-239.120000 -4.832000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 65.3966  71.4309    3.0  26.1   94.0   1.2108   3.9 ------	UNKNOWN                       
264.0344  79.6434    2.6  26.9  161.1   1.0088   4.4 ------	UNKNOWN                       
260.1167  42.4677    2.7  57.6 -165.4   4.1960   4.2 ------	UNKNOWN                       
207.4730  38.0683    3.0  43.7 -116.2   3.1771   3.8 ------	UNKNOWN

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

    Time interval of the image:
-4.832000 13.380610
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
147.4259  70.5081    0.2   1.6  118.8   4.7143  63.3 ------	UNKNOWN                       
239.2723  73.5369    2.1  26.4  179.5   0.4706   5.6 ------	UNKNOWN                       
181.4065  32.3858    2.3  41.0  -83.6   1.4586   5.1 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
34.580600 962.982600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 21.1631  64.3488    3.5  40.2  102.2   7.0374   3.3 ------	UNKNOWN                       
 96.5075  47.6733    3.0  33.0   28.7   3.0482   3.9 ------	UNKNOWN                       
100.9872  43.9685    2.6  34.9   20.7   3.5081   4.5 ------	UNKNOWN                       
181.6500  87.7619    3.6  17.7  139.2   1.7587   3.2 ------	UNKNOWN                       
268.5713  65.1275    3.0  38.5  170.3   3.1434   3.8 ------	UNKNOWN                       
105.4162  24.9154    3.1  51.5    5.8   5.3676   3.8 ------	UNKNOWN                       
263.9458  67.4099    2.8  35.6  171.2   2.9484   4.1 ------	UNKNOWN                       
147.4318  70.4813    0.9   0.0  -43.1   5.8168  13.0 ------	UNKNOWN                       
241.2119  35.2163    2.0  58.3 -151.6  16.9782   5.9 ------	UNKNOWN                       
215.5475  37.3260    3.7  47.9 -129.0   6.9672   3.1 ------	UNKNOWN                       
207.7194  37.3185    3.5  45.3 -121.2   7.0318   3.3 ------	UNKNOWN