Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Sun May 17 23:59:36 EDT 2015
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger639433
======================================================================

  Trigger: 00639433      Segment: 000

  BAT Trigger Time: 452046088.768   [s; MET]
      Trigger Stop: 452046090.816   [s; MET]
               UTC: 2015-04-30T00:21:15.254160    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 326.490552682698   Dec: -27.9275457785092  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.21
     Image Trigger?:     NO
     Rate S/N Ratio:     53.619026473818  [ if not an image trigger ]
     Image S/N Ratio:    7.21

  Analysis Position:   [ source = BAT ]
    RA: 326.490552682698   Dec: -27.9275457785092  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 326.478336224977   Dec: -27.9157234611205  [deg; J2000]  
        { 21h 45m 54.8s , -27d 54' 56.6" }
         +/- 1.53276330908951 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.635985090250733 [arcmin] (formal 1-sigma fit error)
    SNR: 16.5254752244778
 
  Angular difference between the analysis and refined position is 0.960534 arcmin
 
  Partial Coding Fraction: 0.05761719    [ including projection effects ]

  Duration
     T90: 106.879999995232 +/- 7.02755263860171
        Measured from: -8.02399998903275
                   to: 98.8560000061989     [s; relative to TRIGTIME]
     T50: 45.6000000238419 +/- 12.1512600658553
        Measured from: 0.0400000214576721
                   to: 45.6400000452995     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.972000002861023     
                   to: 1.97200000286102     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -10.9359999895096     
                   to: 108.695999979973     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     2.038652   3.303377   3.218708   0.971239
           0.206399   0.222208   0.204792   0.170343 [error]
 Peak      0.147112   0.161659   0.256416   0.068977
           0.030220   0.039259   0.041162   0.029845 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  119.632  -10.936  108.696
T90   106.880   -8.024   98.856
T50    45.600    0.040   45.640
Peak    1.000    0.972    1.972
 
 
====== 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      -1.366    -0.117      0.118       -           -               -         5.78e-03     -3.95e-04          3.95e-04      48.090   57
CPL     -1.035    -0.384      0.508      158.704     -65.316      -158.704      8.28e-03     -2.74e-03          5.83e-03      46.580   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      -1.181     -0.326     0.327       -           -               -         4.23e-02     -8.25e-03          8.23e-03      54.760   57
CPL     -0.935      0.935     1.712      262.386    -262.386      -262.386      5.42e-02     -1.95e-02          2.14e-01      54.660   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   7.79e-07  1.55e-06  2.41e-06  8.22e-06  6.73e-06  1.30e-05   erg/cm2
      90%_error_low -9.74e-08 -1.20e-07 -1.98e-07 -1.39e-06 -4.93e-07 -1.53e-06   erg/cm2
      90%_error_hi   1.01e-07  1.20e-07  1.97e-07  1.57e-06  4.95e-07  1.67e-06   erg/cm2
Peak flux       PL   1.28e+00  1.56e+00  1.38e+00  2.09e+00  4.96e+00  6.32e+00   ph/cm2/s
      90%_error_low -4.49e-01 -3.69e-01 -3.01e-01 -8.21e-01 -1.00e+00 -1.26e+00   ph/cm2/s
      90%_error_hi   5.08e-01  3.59e-01  2.94e-01  1.05e+00  1.01e+00  1.29e+00   ph/cm2/s
 
Fluence        CPL   7.26e-07  1.60e-06  2.49e-06  5.31e-06  6.62e-06  1.01e-05   erg/cm2
      90%_error_low -1.20e-07 -1.36e-07 -2.28e-07 -2.29e-06 -5.22e-07 -2.31e-06   erg/cm2
      90%_error_hi   1.23e-07  1.39e-07  2.33e-07  3.40e-06  5.19e-07  3.48e-06   erg/cm2
Peak flux      CPL   1.20e+00  1.59e+00  1.43e+00  1.70e+00  4.93e+00  5.92e+00   ph/cm2/s
      90%_error_low -6.13e-01 -1.98e-01 -3.46e-01 -1.70e+00 -1.02e+00 -1.65e+00   ph/cm2/s
      90%_error_hi   5.75e-01  3.99e-01  4.36e-01  1.38e+00  1.02e+00  1.65e+00   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
  326.4783   -27.9157   0.0117    48.8758    38.1536         7.2190216     16.525 TRIG_00639433                 
 
Foreground time interval of the image:
-10.936  31.133 (delta_t =  42.069 [sec])
Background time interval of the image:
-239.768 -10.936 (delta_t = 228.832 [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  -10.936 sec. to  108.696 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.36624     ( -0.117355   0.117736 )
Norm@50keV  : 5.77871E-03    ( -0.000394839   0.000394813 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          48.09 using 59 PHA bins.
# Reduced chi-squared =         0.8436 for     57 degrees of freedom 
# Null hypothesis probability =   7.937390e-01
 
Photon flux (15-150 keV)    in 119.6 sec: 0.698547 ( -0.050368  0.050487 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.72684e-06 ( -4.93067e-07  4.94887e-07 ) ergs/cm2
    Cutoff power-law model
    Time interval is from  -10.936 sec. to  108.696 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.03462     ( -0.384326   0.507761 )
Epeak [keV] : 158.704      ( -65.3168 -158.705 )
Norm@50keV  : 8.28267E-03    ( -0.00273645   0.00582929 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          46.58 using 59 PHA bins.
# Reduced chi-squared =         0.8318 for     56 degrees of freedom 
# Null hypothesis probability =   8.110386e-01
 
Photon flux (15-150 keV)    in 119.6 sec: 0.688590 ( -0.052228  0.052278 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.62066e-06 ( -5.21766e-07  5.18894e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from    0.972 sec. to    1.972 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.18062     ( -0.325579   0.326713 )
Norm@50keV  : 4.23487E-02    ( -0.00824776   0.0082347 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.76 using 59 PHA bins.
# Reduced chi-squared =         0.9607 for     57 degrees of freedom 
# Null hypothesis probability =   5.596512e-01
 
Photon flux (15-150 keV)    in 1 sec: 4.95775 ( -1.00173  1.00524 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.32076e-07 ( -8.99863e-08  9.00676e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from    0.972 sec. to    1.972 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.934864     ( 0.934725   1.71219 )
Epeak [keV] : 262.386      ( -262.263 -262.263 )
Norm@50keV  : 5.41692E-02    ( -0.019479   0.213941 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.66 using 59 PHA bins.
# Reduced chi-squared =         0.9761 for     56 degrees of freedom 
# Null hypothesis probability =   5.255375e-01
 
Photon flux (15-150 keV)    in 1 sec: 4.92759 ( -1.01959  1.01521 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.078e-08 ( 0  0 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 106.88 sec.
Hardness ratio (energy fluence ratio) = 1.55163646855

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

    S(15-50 keV)  = 2.3314861e-06
S(50-150 keV) = 4.39534e-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 = 9.006498952128774E-01, IMY = -7.075603182957515E-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:
-239.768000 -10.936000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.5670  35.2016    1.9  45.4  137.6   2.8098   6.2    1.1	Cyg X-1                       
308.0676  41.0024    7.6  40.8  148.6   0.3908   1.5    3.6	Cyg X-3                       
326.2844  38.3513    4.1  27.7  159.0   0.3685   2.8    5.6	Cyg X-2                       
312.3315  32.3779    2.6  34.4  137.5   0.8922   4.5 ------	UNKNOWN                       
332.7587  73.4968    2.4  57.1 -170.1   2.5164   4.9 ------	UNKNOWN                       
 18.5989  10.3660    3.0  31.9  -67.8   0.6452   3.9 ------	UNKNOWN

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

    Time interval of the image:
-10.936000 31.132590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.6438  35.2380    3.1  45.4  137.6   1.1054   3.7    3.4	Cyg X-1                       
308.0013  41.0585   14.9  40.9  148.7   0.1460   0.8    8.0	Cyg X-3                       
326.0504  38.3268    5.8  27.9  158.6   0.1939   2.0    5.7	Cyg X-2                       
326.4783 -27.9158    0.8  48.9   38.2   7.2203  14.8 ------	UNKNOWN                       
343.9069  46.0484    2.2  29.2 -169.2   0.4386   5.2 ------	UNKNOWN                       
 29.6265  28.2099    2.6  41.2  -99.2   1.4793   4.5 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
95.532590 738.232590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
285.1222 -24.9441   10.8  37.0  107.3   1.2024   1.1    4.9	HT1900.1-2455                 
302.3072 -61.9364    2.5  37.6   40.9   3.4307   4.6 ------	UNKNOWN                       
300.9310  10.4151    3.5  45.6  166.0   3.1518   3.3 ------	UNKNOWN                       
324.7028  30.7729    4.8  58.7 -159.3   7.8761   2.4 ------	UNKNOWN