Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Thu Aug 13 13:13:47 EDT 2015
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger351588
======================================================================

  Trigger: 00351588      Segment: 000

  BAT Trigger Time: 263607785.216   [s; MET]
      Trigger Stop: 263607785.472   [s; MET]
               UTC: 2009-05-10T00:23:00.487940    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 333.555035285725   Dec: -26.6056164508738  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.48
     Image Trigger?:     NO
     Rate S/N Ratio:     145.485394455938  [ if not an image trigger ]
     Image S/N Ratio:    7.48

  Analysis Position:   [ source = BAT ]
    RA: 333.555035285725   Dec: -26.6056164508738  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 333.569946892619   Dec: -26.6012273042789  [deg; J2000]  
        { 22h 14m 16.8s , -26d 36' 04.4" }
         +/- 1.96728534534086 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.852833506300009 [arcmin] (formal 1-sigma fit error)
    SNR: 11.5693209772609
 
  Angular difference between the analysis and refined position is 0.842205 arcmin
 
  Partial Coding Fraction: 0.1621094    [ including projection effects ]

  Duration
     T90: 5.66399997472763 +/- 1.87637094392059
        Measured from: -0.0160000026226044
                   to: 5.64799997210503     [s; relative to TRIGTIME]
     T50: 0.399999976158142 +/- 1.68830328395208
        Measured from: 0.0480000078678131
                   to: 0.447999984025955     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.315999984741211     
                   to: 0.684000015258789     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.127999991178513     
                   to: 6.22400000691414     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.168837   0.224745   0.281819   0.170928
           0.036318   0.039376   0.036786   0.033040 [error]
 Peak      0.074758   0.169725   0.210696   0.108734
           0.017892   0.020330   0.021817   0.020422 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    6.352   -0.128    6.224
T90     5.664   -0.016    5.648
T50     0.400    0.048    0.448
Peak    1.000   -0.316    0.684
 
 
====== 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      -1.062    -0.259      0.274       -           -               -         9.18e-03     -1.37e-03          1.34e-03      52.450   57
CPL     -1.055    -0.263      0.334     9999.270    -9999.270      -9999.270      9.21e-03     -1.32e-03          8.34e-03      52.460   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      -0.895     -0.203     0.212       -           -               -         3.83e-02     -4.70e-03          4.64e-03      46.160   57
CPL     -0.567     -0.426     0.924      264.487    -264.487      -264.487      5.27e-02     -1.82e-02          7.07e-02      45.650   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   4.95e-08  1.19e-07  2.28e-07  1.07e-06  6.17e-07  1.46e-06   erg/cm2
      90%_error_low -1.50e-08 -2.28e-08 -3.47e-08 -3.40e-07 -9.02e-08 -3.57e-07   erg/cm2
      90%_error_hi   1.67e-08  2.21e-08  3.42e-08  4.44e-07  9.04e-08  4.45e-07   erg/cm2
Peak flux       PL   1.83e-04  3.25e-03  2.40e-02  3.32e+00  1.65e-01  3.16e+00   ph/cm2/s
      90%_error_low 6.00e-05 -2.36e-04 1.01e-02 -3.60e-01 -1.02e-02 -1.52e-01   ph/cm2/s
      90%_error_hi   4.75e-04  4.10e-03  5.07e-02  2.06e+00  1.56e-01  2.31e+00   ph/cm2/s
 
Fluence        CPL   4.94e-08  1.19e-07  2.24e-07  1.08e-06  6.19e-07  1.38e-06   erg/cm2
      90%_error_low    N/A    -2.33e-08 -3.84e-08 -6.10e-07 -1.12e-07 -5.15e-07   erg/cm2
      90%_error_hi     N/A     2.19e-08  5.02e-08  1.90e-07  1.09e-07  5.14e-07   erg/cm2
Peak flux      CPL   8.04e-01  1.29e+00  1.44e+00  2.03e+00  4.34e+00  5.57e+00   ph/cm2/s
      90%_error_low -2.79e-01 -2.14e-01 -2.09e-01 -1.01e+00 -5.50e-01 -1.19e+00   ph/cm2/s
      90%_error_hi   2.85e-01  2.16e-01  2.21e-01  9.57e-01  5.52e-01  1.16e+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
  333.5699   -26.6012   0.0165    46.0716    20.2673         0.9025207     11.569 TRIG_00351588                 
 
Foreground time interval of the image:
 -0.128   6.224 (delta_t =   6.352 [sec])
Background time interval of the image:
-212.715  -0.128 (delta_t = 212.587 [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   -0.128 sec. to    6.224 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.06233     ( -0.259139   0.273625 )
Norm@50keV  : 9.17981E-03    ( -0.00136551   0.00134233 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.45 using 59 PHA bins.
# Reduced chi-squared =         0.9201 for     57 degrees of freedom 
# Null hypothesis probability =   6.463856e-01
 
Photon flux (15-150 keV)    in 6.352 sec: 1.06125 ( -0.163754  0.16494 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.17249e-07 ( -9.02492e-08  9.03877e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -0.128 sec. to    6.224 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.05505     ( -0.262404   0.334024 )
Epeak [keV] : 9999.27      ( -9999.35 -9999.35 )
Norm@50keV  : 9.20748E-03    ( -0.00134348   0.00832292 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.46 using 59 PHA bins.
# Reduced chi-squared =         0.9368 for     56 degrees of freedom 
# Null hypothesis probability =   6.096704e-01
 
Photon flux (15-150 keV)    in 6.352 sec: 1.06115 ( -0.163913  0.16478 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.18729e-07 ( -1.11621e-07  1.08817e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from   -0.316 sec. to    0.684 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.894917     ( -0.20321   0.212476 )
Norm@50keV  : 3.82889E-02    ( -0.00469858   0.00464467 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          46.16 using 59 PHA bins.
# Reduced chi-squared =         0.8098 for     57 degrees of freedom 
# Null hypothesis probability =   8.472341e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.164894 0.178393 0.176148 0.174435 0.116712 8.00906E-02 5.84951E-02 4.61459E-02 3.90215E-02 3.47509E-02 3.03627E-02 2.57601E-02 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.30606e-07 ( -5.30251e-08  5.31986e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -0.316 sec. to    0.684 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.567263     ( -0.426077   0.923741 )
Epeak [keV] : 264.487      ( -264.487 -264.487 )
Norm@50keV  : 5.27062E-02    ( -0.0182405   0.0707348 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          45.65 using 59 PHA bins.
# Reduced chi-squared =         0.8153 for     56 degrees of freedom 
# Null hypothesis probability =   8.367374e-01
 
Photon flux (15-150 keV)    in 1 sec: 4.34206 ( -0.55041  0.55216 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.26167e-07 ( -5.53155e-08  5.4617e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 5.664 sec.
Hardness ratio (energy fluence ratio) = 1.91544588007

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

    S(15-50 keV)  = 1.6853587e-07
S(50-150 keV) = 4.487127e-07

    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 = 9.738492822632381E-01, IMY = -3.596064605939755E-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:
-212.715400 -0.128000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.5797  35.1877    0.5  34.7  143.2   7.1896  23.9    1.0	Cyg X-1                       
308.0275  40.9324    1.9  31.2  158.2   1.4273   6.0    3.9	Cyg X-3                       
326.1242  38.2501    8.6  20.2  179.2   0.2327   1.3    4.8	Cyg X-2                       
344.0508 -18.5084    2.1  39.1    4.7   1.5026   5.6 ------	UNKNOWN                       
347.0993  -1.7928    2.1  24.5  -12.4   0.9835   5.4 ------	UNKNOWN                       
351.7921  31.3488    2.7  19.5 -112.1   0.7462   4.3 ------	UNKNOWN                       
 18.5931   9.2361    3.0  43.6  -64.0   3.4926   3.8 ------	UNKNOWN

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

    Time interval of the image:
-0.128000 6.224000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.5288  35.3447    4.1  34.7  143.5  -0.1322  -2.8    9.1	Cyg X-1                       
308.0613  41.0511    3.1  31.3  158.4   0.1296   3.7    6.3	Cyg X-3                       
326.0816  38.1283    0.0  20.1  179.0  -0.0460  -1.8   12.4	Cyg X-2                       
312.6863 -14.8924    2.5  40.6   52.7   0.4419   4.7 ------	UNKNOWN                       
333.5700 -26.6012    1.0  46.1   20.3   0.9024  11.6 ------	UNKNOWN                       
  1.7474  76.2894    2.7  58.5 -153.8   0.6752   4.3 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
78.284590 962.844000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 35.8112 -41.4906    3.1  52.5  -33.3   6.1886   3.8 ------	UNKNOWN                       
350.0788  19.2221    2.8  48.6 -135.7   7.9176   4.2 ------	UNKNOWN