Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Mon Jun 22 21:29:54 EDT 2015
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger304549
======================================================================

  Trigger: 00304549      Segment: 000

  BAT Trigger Time: 226228237.888   [s; MET]
      Trigger Stop: 226228238.4   [s; MET]
               UTC: 2008-03-03T09:10:35.271760    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 112.073412725568   Dec: -70.2400675622224  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.67
     Image Trigger?:     NO
     Rate S/N Ratio:     12.6885775404495  [ if not an image trigger ]
     Image S/N Ratio:    7.67

  Analysis Position:   [ source = BAT ]
    RA: 112.073412725568   Dec: -70.2400675622224  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 112.048506592276   Dec: -70.2234192326297  [deg; J2000]  
        { 07h 28m 11.6s , -70d 13' 24.3" }
         +/- 1.48060312759175 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.524385744610013 [arcmin] (formal 1-sigma fit error)
    SNR: 17.3633922562449
 
  Angular difference between the analysis and refined position is 1.119487 arcmin
 
  Partial Coding Fraction: 0.8046875    [ including projection effects ]

  Duration
     T90: 67.5879999995232 +/- 19.6456444856086
        Measured from: 0.247999995946884
                   to: 67.83599999547     [s; relative to TRIGTIME]
     T50: 29.8199999928474 +/- 12.5281636477789
        Measured from: 2.08399999141693
                   to: 31.9039999842644     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.0600000023841858     
                   to: 1.06000000238419     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.204000025987625     
                   to: 73.5839999914169     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.254762   0.444591   0.289257   0.089523
           0.047258   0.048162   0.042050   0.037062 [error]
 Peak      0.048609   0.070477   0.031198   0.012646
           0.006741   0.007122   0.005992   0.005291 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   73.788   -0.204   73.584
T90    67.588    0.248   67.836
T50    29.820    2.084   31.904
Peak    1.000    0.060    1.060
 
 
====== 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      -1.480    -0.246      0.245       -           -               -         9.51e-04     -1.28e-04          1.26e-04      71.170   57
CPL     -1.487    -0.941      0.237     9999.330      N/A           N/A         9.53e-04        N/A               N/A         71.180   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      -1.691     -0.223     0.217       -           -               -         9.89e-03     -1.41e-03          1.39e-03      64.890   57
CPL     -0.818     -1.013     1.723       55.922     -15.517       -55.922      3.21e-02     -3.21e-02          3.16e-01      63.360   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   8.80e-08  1.64e-07  2.35e-07  7.12e-07  6.68e-07  1.20e-06   erg/cm2
      90%_error_low -1.99e-08 -2.26e-08 -4.21e-08 -2.44e-07 -9.92e-08 -2.80e-07   erg/cm2
      90%_error_hi   2.10e-08  2.22e-08  4.15e-08  3.22e-07  1.01e-07  3.45e-07   erg/cm2
Peak flux       PL   4.89e-01  4.40e-01  2.72e-01  2.57e-01  1.31e+00  1.46e+00   ph/cm2/s
      90%_error_low -9.44e-02 -5.71e-02 -4.94e-02 -8.07e-02 -1.69e-01 -1.89e-01   ph/cm2/s
      90%_error_hi   9.81e-02  5.70e-02  4.95e-02  1.01e-01  1.69e-01  1.90e-01   ph/cm2/s
 
Fluence        CPL   8.80e-08  1.60e-07  2.35e-07  7.99e-07  6.74e-07  1.19e-06   erg/cm2
      90%_error_low -1.99e-08 -2.98e-08 -4.21e-08 -4.79e-07 -1.05e-07 -3.95e-07   erg/cm2
      90%_error_hi   2.10e-08  3.64e-08  4.16e-08  7.08e-08  9.47e-08  3.17e-07   erg/cm2
Peak flux      CPL   4.56e-01  4.90e-01  2.67e-01  7.96e-02  1.27e+00  1.29e+00   ph/cm2/s
      90%_error_low -1.09e-01 -8.84e-02 -7.27e-02 -7.96e-02 -1.79e-01 -1.96e-01   ph/cm2/s
      90%_error_hi   1.09e-01  9.76e-02  5.75e-02  2.06e-01  1.78e-01  2.82e-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
      112.0485   -70.2234   0.0111    30.7386   -10.7332         0.6510917     17.363 TRIG_00304549                 
     
    Foreground time interval of the image:
     -0.204  10.013 (delta_t =  10.217 [sec])
    Background time interval of the image:
    -239.888  -0.204 (delta_t = 239.684 [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   -0.204 sec. to   73.584 sec.
     
    Spectral model in power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: -1.48012     ( -0.246236   0.24472 )
    Norm@50keV  : 9.51381E-04    ( -0.00012769   0.000126368 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          71.17 using 59 PHA bins.
    # Reduced chi-squared =          1.249 for     57 degrees of freedom 
    # Null hypothesis probability =   9.821400e-02
     
    Photon flux (15-150 keV)    in 73.79 sec: 0.118149 ( -0.015604  0.015652 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 6.68278e-07 ( -9.91664e-08  1.00529e-07 ) ergs/cm2
     
    
    Cutoff power-law model
    Time interval is from   -0.204 sec. to   73.584 sec.
    Spectral model in the cutoff power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: -2.32412     ( -0.10409   1.0732 )
    Epeak [keV] : 114.355      (   )
    Norm@50keV  : 3.36072E-04    (     )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          69.53 using 59 PHA bins.
    # Reduced chi-squared =          1.242 for     56 degrees of freedom 
    # Null hypothesis probability =   1.056768e-01
     
    Photon flux (15-150 keV)    in 73.79 sec: 0.119266 ( -0.01675  0.014513 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 6.73857e-07 ( -1.04929e-07  9.46674e-08 ) ergs/cm2
     
    

    1-s peak spectrum fit

    Power-law model
    Time interval is from    0.060 sec. to    1.060 sec.
     
    Spectral model in power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: -1.6908     ( -0.222522   0.217292 )
    Norm@50keV  : 9.89040E-03    ( -0.00140906   0.00138646 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          64.89 using 59 PHA bins.
    # Reduced chi-squared =          1.138 for     57 degrees of freedom 
    # Null hypothesis probability =   2.209997e-01
     
    Photon flux (15-150 keV)    in 1 sec: 1.30942 ( -0.16861  0.16869 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 9.16558e-08 ( -1.35848e-08  1.38315e-08 ) ergs/cm2
     
    
    Cutoff power-law model
    Time interval is from    0.060 sec. to    1.060 sec.
    Spectral model in the cutoff power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: -0.818075     ( -1.01587   1.7203 )
    Epeak [keV] : 55.9221      ( -15.4022 -55.8071 )
    Norm@50keV  : 3.20558E-02    ( -0.0323416   0.315747 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          63.36 using 59 PHA bins.
    # Reduced chi-squared =          1.131 for     56 degrees of freedom 
    # Null hypothesis probability =   2.328353e-01
     
    Photon flux (15-150 keV)    in 1 sec: 1.27079 ( -0.17915  0.17783 ) 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 = 5.842652089818183E-01, IMY = 1.107487518361346E-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:
    -239.888000 -0.204000
     
    # RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
    #  [deg]    [deg]    ['] [deg]  [deg]                   [']
    135.4978 -40.4927    3.8  43.0   40.5   1.5196   3.0    4.0	Vela X-1                      
    170.5710 -60.6810    2.8  13.6   42.7   0.6825   4.2    8.3	Cen X-3                       
    186.5942 -62.7432    2.4   5.9   53.5   0.9283   4.9    2.4	GX 301-2                      
    255.8508 -37.8916   12.4  42.3 -153.4   0.2985   0.9    7.0	4U 1700-377                   
    256.3207 -36.3723    7.1  43.8 -154.1   0.5929   1.6    6.3	GX 349+2                      
    262.9743 -24.7401   34.3  56.7 -154.9  -0.4030  -0.3    1.9	GX 1+4                        
    264.7240 -44.4396   10.2  40.6 -139.5   0.4093   1.1    1.0	4U 1735-44                    
    263.0008 -33.8323  100.7  48.8 -149.4  -0.0599  -0.1    0.6	GX 354-0                      
    142.9151 -36.5310    2.7  43.2   50.7   3.3850   4.4 ------	UNKNOWN                       
    239.2156 -17.7867    2.8  54.2  177.1   2.8540   4.1 ------	UNKNOWN                       
    136.2908 -72.1106    2.8  22.9   -7.5   0.7493   4.2 ------	UNKNOWN                       
    243.2209 -52.4617    1.8  25.4 -150.1   1.3203   6.3 ------	UNKNOWN                       
     66.0966 -51.2543    2.3  58.3  -19.6   5.5427   4.9 ------	UNKNOWN                       
    260.4099 -21.3440    3.8  58.7 -159.2   4.8058   3.1 ------	UNKNOWN                       
    278.7414 -42.7394    2.2  47.9 -129.0   4.5154   5.2 ------	UNKNOWN                       
    

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

    Time interval of the image:
    -0.204000 10.012590
     
    # RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
    #  [deg]    [deg]    ['] [deg]  [deg]                   [']
    135.7706 -40.4722   16.1  42.9   40.7   0.0695   0.7   12.1	Vela X-1                      
    170.4683 -60.7573    6.3  13.6   42.3  -0.0595  -1.8    9.2	Cen X-3                       
    186.6574 -62.9005   17.3   5.8   52.2  -0.0213  -0.7    7.8	GX 301-2                      
    256.1365 -37.9063  339.6  42.4 -153.1   0.0019   0.0    8.0	4U 1700-377                   
    256.2856 -36.3660    8.9  43.8 -154.1  -0.0726  -1.3    8.0	GX 349+2                      
    262.8912 -24.7198    6.7  56.7 -155.0   0.2653   1.7    6.6	GX 1+4                        
    264.5527 -44.4190    8.3  40.6 -139.6  -0.0825  -1.4    8.4	4U 1735-44                    
    262.9746 -33.8906    7.0  48.7 -149.3  -0.1277  -1.7    3.4	GX 354-0                      
    189.6324 -47.1289    2.1  18.5  107.2   0.2226   5.6 ------	UNKNOWN                       
    112.0485 -70.2234    0.7  30.7  -10.7   0.6512  17.4 ------	UNKNOWN                       
    265.5863 -30.5829    2.1  52.7 -149.0   0.6072   5.4 ------	UNKNOWN                       
    

    Post-slew image of 15-350 keV band

    Time interval of the image:
    61.612580 962.219100
     
    # RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
    #  [deg]    [deg]    ['] [deg]  [deg]                   [']
    135.5617 -40.5601    1.1  32.1   72.7   4.4237  10.5    1.5	Vela X-1                      
    170.0357 -60.7060    9.2  24.7  134.9   0.3003   1.2    9.6	Cen X-3                       
    186.7246 -62.8616    3.0  28.6  151.0   1.0865   3.9    5.8	GX 301-2                      
     86.8512 -81.3264    2.6  12.5 -124.8   0.8353   4.4 ------	UNKNOWN                       
    319.3602 -77.4095    3.0  31.5 -131.0   1.0581   3.9 ------	UNKNOWN                       
    272.4996 -51.3087    3.8  57.6 -156.4   4.4908   3.0 ------	UNKNOWN