Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Sat May  9 19:51:32 EDT 2015
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger146970
======================================================================

  Trigger: 00146970      Segment: 000

  BAT Trigger Time: 143612953.92   [s; MET]
      Trigger Stop: 143612959.424   [s; MET]
               UTC: 2005-07-21T04:29:14.287540    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 253.445004837197   Dec: -28.3896705827692  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    6.22
     Image Trigger?:     NO
     Rate S/N Ratio:     15.0996688705415  [ if not an image trigger ]
     Image S/N Ratio:    6.22

  Analysis Position:   [ source = BAT ]
    RA: 253.445004837197   Dec: -28.3896705827692  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 253.460659468508   Dec: -28.3903491142184  [deg; J2000]  
        { 16h 53m 50.6s , -28d 23' 25.3" }
         +/- 2.03681501200638 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.800982294029788 [arcmin] (formal 1-sigma fit error)
    SNR: 11.0092813273957
 
  Angular difference between the analysis and refined position is 0.827315 arcmin
 
  Partial Coding Fraction: 0.06445312    [ including projection effects ]

  Duration
     T90: 104.700000017881 +/- 46.1094553424698
        Measured from: -1.1879999935627
                   to: 103.512000024319     [s; relative to TRIGTIME]
     T50: 29.8200000226498 +/- 10.9214184160366
        Measured from: 3.75200000405312
                   to: 33.5720000267029     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 3.89600002765656     
                   to: 4.89600002765656     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -3.63999998569489     
                   to: 149.552000015974     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     2.173287   2.598408   1.644830   0.309012
           0.256747   0.231853   0.194384   0.163346 [error]
 Peak      0.104866   0.190062   0.045173   0.013294
           0.025885   0.025161   0.022166   0.014254 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  153.192   -3.640  149.552
T90   104.700   -1.188  103.512
T50    29.820    3.752   33.572
Peak    1.000    3.896    4.896
 
 
====== 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: 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      -1.862    -0.184      0.178       -           -               -         2.82e-03     -3.14e-04          3.10e-04      89.680   57
CPL     -1.092    -0.780      0.952       54.416     -13.149       516.402      7.28e-03     -4.43e-03          1.60e-02      86.870   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      -2.349     -0.345     0.306       -           -               -         1.56e-02     -4.29e-03          4.26e-03      86.890   57
CPL      1.762     -1.949     3.546       38.965      -6.539         6.648      3.45e+00     -3.45e+00          2.92e+02      71.160   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   7.76e-07  1.15e-06  1.26e-06  2.61e-06  3.98e-06  5.79e-06   erg/cm2
      90%_error_low -1.21e-07 -1.16e-07 -1.87e-07 -7.16e-07 -4.39e-07 -9.11e-07   erg/cm2
      90%_error_hi   1.26e-07  1.16e-07  1.87e-07  8.75e-07  4.43e-07  1.02e-06   erg/cm2
Peak flux       PL   1.46e+00  8.97e-01  3.53e-01  1.87e-01  2.81e+00  2.90e+00   ph/cm2/s
      90%_error_low -3.89e-01 -2.02e-01 -1.16e-01 -9.10e-02 -6.30e-01 -6.48e-01   ph/cm2/s
      90%_error_hi   4.04e-01  2.02e-01  1.19e-01  1.21e-01  6.32e-01  6.48e-01   ph/cm2/s
 
Fluence        CPL   6.98e-07  1.24e-06  1.27e-06  8.99e-07  3.74e-06  4.11e-06   erg/cm2
      90%_error_low -1.46e-07 -1.51e-07 -2.12e-07 -5.69e-07 -4.92e-07 -7.67e-07   erg/cm2
      90%_error_hi   1.49e-07  1.57e-07  2.08e-07  1.75e-06  5.03e-07  1.78e-06   erg/cm2
Peak flux      CPL   9.47e-01  1.44e+00  3.93e-01  8.00e-03  2.79e+00  2.79e+00   ph/cm2/s
      90%_error_low -4.70e-01 -3.12e-01 -1.80e-01 -8.00e-03 -6.32e-01 -6.32e-01   ph/cm2/s
      90%_error_hi   4.89e-01  3.18e-01  1.93e-01  3.64e-02  6.35e-01  6.35e-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
  253.4607   -28.3903   0.0174    39.0992    91.3758         6.9084507     11.009 TRIG_00146970                 
 
Foreground time interval of the image:
 -3.640 118.981 (delta_t = 122.621 [sec])
Background time interval of the image:
-295.119  -3.640 (delta_t = 291.479 [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   -3.640 sec. to  149.552 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.86189     ( -0.183808   0.178105 )
Norm@50keV  : 2.82300E-03    ( -0.000314075   0.000309855 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          89.68 using 59 PHA bins.
# Reduced chi-squared =          1.573 for     57 degrees of freedom 
# Null hypothesis probability =   3.717259e-03
 
Photon flux (15-150 keV)    in 153.2 sec: 0.398756 ( -0.041512  0.041639 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.97675e-06 ( -4.39313e-07  4.43417e-07 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -3.640 sec. to  149.552 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.09203     ( -0.779836   0.951504 )
Epeak [keV] : 54.4157      ( -13.1487 516.403 )
Norm@50keV  : 7.27530E-03    ( -0.00442873   0.0160311 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          86.87 using 59 PHA bins.
# Reduced chi-squared =          1.551 for     56 degrees of freedom 
# Null hypothesis probability =   5.125119e-03
 
Photon flux (15-150 keV)    in 153.2 sec: 0.384101 ( -0.04414  0.044185 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.73834e-06 ( -4.9174e-07  5.0325e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from    3.896 sec. to    4.896 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.34866     ( -0.35113   0.30055 )
Norm@50keV  : 1.56427E-02    ( -0.00430484   0.00424607 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          86.89 using 59 PHA bins.
# Reduced chi-squared =          1.524 for     57 degrees of freedom 
# Null hypothesis probability =   6.556256e-03
 
Photon flux (15-150 keV)    in 1 sec: 2.80912 ( -0.63041  0.63177 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.51091e-07 ( -3.61884e-08  3.66936e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from    3.896 sec. to    4.896 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.76165     ( -1.98404   3.51112 )
Epeak [keV] : 38.9646      ( -6.56452 6.62208 )
Norm@50keV  : 3.44635    ( -4.33177   291.534 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          71.16 using 59 PHA bins.
# Reduced chi-squared =          1.271 for     56 degrees of freedom 
# Null hypothesis probability =   8.347744e-02
 
Photon flux (15-150 keV)    in 1 sec: 2.78873 ( -0.63153  0.63498 ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = N/A sec.
Hardness ratio (energy fluence ratio) = N/A

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

    S(15-50 keV)  = N/A
S(50-150 keV) = N/A

    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 = -1.951130092065932E-02, IMY = -8.124193839852702E-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:
-295.119400 -3.640000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
170.2943 -60.6154   39.7  54.1 -179.8  -0.3215  -0.3    0.8	Cen X-3                       
186.6598 -62.7761    3.3  50.3  171.3   3.0105   3.5    0.4	GX 301-2                      
244.9859 -15.6451    0.3  30.6   69.6  20.1100  37.7    0.5	Sco X-1                       
212.5649 -62.9935    3.7  47.0  156.2   3.1239   3.1 ------	UNKNOWN                       
160.1296 -57.8419    3.0  57.2 -173.7   5.5827   3.9 ------	UNKNOWN                       
181.4656 -17.7666    3.0  30.3 -122.0   1.3740   3.9 ------	UNKNOWN                       
186.9014  14.1596    4.3  39.8  -66.2   2.9076   2.6 ------	UNKNOWN

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

    Time interval of the image:
-3.640000 118.980600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
170.2285 -60.7635   16.7  54.2 -179.9  -0.3821  -0.7    8.8	Cen X-3                       
186.7193 -62.7151   11.2  50.2  171.3  -0.4080  -1.0    3.7	GX 301-2                      
244.8031 -15.7232    0.0  30.4   69.7   0.1375   0.6   11.3	Sco X-1                       
253.4607 -28.3904    1.1  39.1   91.4   6.9093  10.9 ------	UNKNOWN                       
218.7261  28.5732    1.8  44.9  -17.2   1.4512   6.5 ------	UNKNOWN                       
197.5647  34.1256    2.3  52.3  -40.4   3.5158   5.0 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
175.580620 302.148000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
186.4210 -62.7402   32.6  54.6 -149.2   0.2386   0.4    6.7	GX 301-2                      
244.9850 -15.6452    0.1  14.9  -33.6  11.3360  83.7    0.4	Sco X-1                       
255.8973 -37.7375    7.0   9.6  167.8   0.2257   1.7    7.7	4U 1700-377                   
256.4446 -36.3888    4.0   8.4  162.7   0.3995   2.9    2.1	GX 349+2                      
263.0053 -24.8943   45.7   9.2   69.7   0.0353   0.3    8.9	GX 1+4                        
264.7249 -44.4764    7.9  18.5  153.4   0.2269   1.5    1.8	4U 1735-44                    
268.3731  -1.4485    1.2  30.5   30.2   1.6726   9.3    0.4	SW J1753.5-0127               
270.2958 -25.1448    3.1  15.4   81.4   0.5617   3.8    4.0	GX 5-1                        
270.3913 -25.7088    3.0  15.3   83.6   0.6363   4.3    5.2	GRS 1758-258                  
273.9750 -13.9868    5.6  23.9   56.9   0.3533   2.1    3.5	GX 17+2                       
276.0314 -30.3170    6.0  19.8  100.8   0.3353   1.9    6.3	H1820-303                     
285.1086 -24.7680    3.7  28.5   89.8  -0.7216  -3.1   10.0	HT1900.1-2455                 
262.9191 -33.6907    4.4   9.7  125.1   0.3527   2.6    9.3	GX 354-0                      
296.1406 -40.7283    3.0  36.9  120.7   1.3051   3.8 ------	UNKNOWN                       
291.2272 -33.4554    3.0  32.7  108.2   1.0236   3.9 ------	UNKNOWN                       
273.1932 -66.4767    1.9  40.0  167.5   1.3191   6.0 ------	UNKNOWN                       
251.1010  -5.5265    2.9  23.0   -6.3   0.5770   4.0 ------	UNKNOWN                       
233.4858 -26.1754    2.3  17.8  -88.0   0.7766   5.1 ------	UNKNOWN                       
184.5251 -73.3536    2.9  56.9 -161.8   2.4967   4.0 ------	UNKNOWN                       
213.1767 -40.9743    2.7  35.0 -122.2   0.9629   4.2 ------	UNKNOWN