Analysis Summary

Notes:

Special note: Due to the low partial coding fraction, the refined position is found using the DETECTION mask. Therefore, the refined position and the mask shadow pattern shown here are from analyses with DETECTION mask, everything else uses the FLUX mask.

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Sat May  9 19:06:52 EDT 2015
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger335105
======================================================================

  Trigger: 00335105      Segment: 000

  BAT Trigger Time: 248992536.128   [s; MET]
      Trigger Stop: 248992540.224   [s; MET]
               UTC: 2008-11-21T20:35:32.854060    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 89.2636966592357   Dec: -60.6257043407029  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    9.79
     Image Trigger?:     NO
     Rate S/N Ratio:     39.319206502675  [ if not an image trigger ]
     Image S/N Ratio:    9.79

  Analysis Position:   [ source = BAT ]
    RA: 89.2636966592357   Dec: -60.6257043407029  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA:    Dec:   [deg; J2000]  
        { 00h 00m 00.0s , +00d 00' 00.0" }
         +/- -inf [arcmin] (estimated 90% radius based on SNR)
         +/- 0 [arcmin] (formal 1-sigma fit error)
    SNR: 
 
  Angular difference between the analysis and refined position is 5378.330478 arcmin
 
  Partial Coding Fraction: 0.05078125    [ including projection effects ]

  Duration
     T90: 17.5199999511242 +/- 2.00670876082545
        Measured from: -3.43199998140335
                   to: 14.0879999697208     [s; relative to TRIGTIME]
     T50: 9.11999997496605 +/- 1.68481214282871
        Measured from: 0.631999999284744
                   to: 9.75199997425079     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 13.580000013113     
                   to: 14.580000013113     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -5.30399999022484     
                   to: 14.4560000002384     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.826651   1.979833   2.397285   1.011585
           0.126032   0.138277   0.135600   0.110438 [error]
 Peak      0.086335   0.142615   0.202693   0.079431
           0.029010   0.032773   0.034162   0.027135 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   19.760   -5.304   14.456
T90    17.520   -3.432   14.088
T50     9.120    0.632    9.752
Peak    1.000   13.580   14.580
 
 
====== 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      -1.088    -0.112      0.115       -           -               -         2.45e-02     -1.72e-03          1.71e-03      47.740   57
CPL     -0.695    -0.431      0.509      208.387     -83.050      -208.387      3.55e-02     -1.15e-02          2.06e-02      45.610   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      -1.173     -0.361     0.379       -           -               -         3.55e-02     -7.68e-03          7.59e-03      52.120   57
CPL     -1.118      N/A       N/A         933.214      N/A           N/A         3.75e-02        N/A               N/A         52.120   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   4.21e-07  9.96e-07  1.87e-06  8.54e-06  5.08e-06  1.18e-05   erg/cm2
      90%_error_low -5.98e-08 -8.92e-08 -1.26e-07 -1.23e-06 -3.34e-07 -1.28e-06   erg/cm2
      90%_error_hi   6.33e-08  8.85e-08  1.26e-07  1.36e-06  3.34e-07  1.39e-06   erg/cm2
Peak flux       PL   1.07e+00  1.31e+00  1.16e+00  1.77e+00  4.15e+00  5.31e+00   ph/cm2/s
      90%_error_low -4.34e-01 -3.62e-01 -2.61e-01 -7.23e-01 -9.47e-01 -1.12e+00   ph/cm2/s
      90%_error_hi   5.08e-01  3.51e-01  2.56e-01  9.64e-01  9.56e-01  1.13e+00   ph/cm2/s
 
Fluence        CPL   3.73e-07  1.01e-06  1.98e-06  5.66e-06  5.05e-06  9.01e-06   erg/cm2
      90%_error_low -7.71e-08 -9.38e-08 -1.70e-07 -2.05e-06 -3.39e-07 -2.03e-06   erg/cm2
      90%_error_hi   8.21e-08  9.44e-08  1.73e-07  3.30e-06  3.38e-07  3.28e-06   erg/cm2
Peak flux      CPL   1.05e+00  1.31e+00  1.17e+00  1.81e+00  4.14e+00  5.22e+00   ph/cm2/s
      90%_error_low -6.20e-01 -3.59e-01 -2.68e-01 -1.81e+00 -9.78e-01 -1.83e+00   ph/cm2/s
      90%_error_hi   3.73e-01  3.95e-01  4.08e-01  4.69e-01  9.21e-01  1.20e+00   ph/cm2/s
 
======================================================================
  • Special notes of this burst




    Image

    Pre-slew 15.0-350.0 keV image (Event data; DETECTION mask)

    #   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
89.264 -60.626 0.000 57.735 -9.270 5.718 23.499 TRIG_00335105
 
Image time interval: -5.304 to 14.456 [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   -5.304 sec. to   14.456 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.0881     ( -0.112278   0.115059 )
Norm@50keV  : 2.44966E-02    ( -0.00172134   0.0017071 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          47.74 using 59 PHA bins.
# Reduced chi-squared =         0.8376 for     57 degrees of freedom 
# Null hypothesis probability =   8.038973e-01
 
Photon flux (15-150 keV)    in 19.76 sec: 2.83825 ( -0.21057  0.21187 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.08085e-06 ( -3.34203e-07  3.34505e-07 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -5.304 sec. to   14.456 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.694585     ( -0.431476   0.508788 )
Epeak [keV] : 208.387      ( -83.0502 -208.387 )
Norm@50keV  : 3.54624E-02    ( -0.0115361   0.0205984 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          45.61 using 59 PHA bins.
# Reduced chi-squared =         0.8145 for     56 degrees of freedom 
# Null hypothesis probability =   8.379210e-01
 
Photon flux (15-150 keV)    in 19.76 sec: 2.78903 ( -0.2163  0.21835 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.05461e-06 ( -3.39226e-07  3.38473e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from   13.580 sec. to   14.580 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.17324     ( -0.360898   0.378768 )
Norm@50keV  : 3.54846E-02    ( -0.00767654   0.00758637 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.12 using 59 PHA bins.
# Reduced chi-squared =         0.9143 for     57 degrees of freedom 
# Null hypothesis probability =   6.584082e-01
 
Photon flux (15-150 keV)    in 1 sec: 4.15018 ( -0.94664  0.95606 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.62819e-07 ( -7.86806e-08  7.87616e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   13.580 sec. to   14.580 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.11841     (       )
Epeak [keV] : 933.214      (   )
Norm@50keV  : 3.75315E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.12 using 59 PHA bins.
# Reduced chi-squared =         0.9306 for     56 degrees of freedom 
# Null hypothesis probability =   6.226614e-01
 
Photon flux (15-150 keV)    in 1 sec: 4.14445 ( -0.97751  0.92078 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.62493e-07 ( -8.03495e-08  7.74536e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 17.52 sec.
Hardness ratio (energy fluence ratio) = 1.88152473769

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

    S(15-50 keV)  = 1.4169526e-06
S(50-150 keV) = 3.663851e-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 (with DETECTION mask) 

    IMX = 1.56329747719, IMY = 0.255147024436

    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:
-147.827410 -5.304000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5321 -40.5677    0.9  28.4  -37.5   1.6761  12.2    0.8	Vela X-1                      
148.0100  16.0640    2.7  32.2  176.1   0.5865   4.3 ------	UNKNOWN

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

    Time interval of the image:
-5.304000 14.456000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.6961 -40.5919    5.1  28.5  -37.7  -0.1201  -2.3    8.0	Vela X-1                      
 83.3672 -37.0878    2.9  50.4   18.9   0.7495   4.0 ------	UNKNOWN                       
132.6114  -0.7608    2.9  11.5  147.6   0.1813   4.0 ------	UNKNOWN                       
163.4053  35.5555    2.2  56.0  177.5   1.2796   5.3 ------	UNKNOWN                       
 89.2747 -60.6111    0.6  57.7   -9.3   6.6229  19.7 ------	UNKNOWN                       
121.1387 -57.0913    2.3  45.7  -24.1   0.4432   4.9 ------	UNKNOWN                       
179.0069  -4.7930    1.7  46.5 -127.8   1.2206   6.8 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
369.772600 962.975500
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4425  35.3601    2.6  54.9 -160.3   4.5107   4.4    1.3	Her X-1                       
163.0831  36.1246    3.0  19.3   56.5   1.1907   3.8 ------	UNKNOWN                       
171.0821  30.7607    3.3  13.3   34.3   0.9947   3.5 ------	UNKNOWN