Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Mon Jan 20 11:39:01 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger259803
======================================================================

  Trigger: 00259803      Segment: 000

  BAT Trigger Time: 192684823.7   [s; MET]
      Trigger Stop: 192684823.764   [s; MET]
               UTC: 2007-02-09T03:33:41.947620    [includes UTCF correction] 
       Where From?: (*SHORT BURST*) TDRSS scaled map message

  BAT 
    RA: 46.2373180663858   Dec: -47.3701637771961  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    9.09
     Image Trigger?:     NO
     Rate S/N Ratio:     18.7082869338697  [ if not an image trigger ]
     Image S/N Ratio:    9.09

  Analysis Position:   [ source = BAT ]
    RA: 46.2373180663858   Dec: -47.3701637771961  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 46.2356727640698   Dec: -47.3879774457012  [deg; J2000]  
        { 03h 04m 56.6s , -47d 23' 16.7" }
         +/- 2.23019232054842 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.23588743999531 [arcmin] (formal 1-sigma fit error)
    SNR: 9.67133662802762
 
  Angular difference between the analysis and refined position is 1.070908 arcmin
 
  Partial Coding Fraction: 0.8515625    [ including projection effects ]

  Duration
     T90: 0.0680000185966492 +/- 0.0178885400881622
        Measured from: 0.00400000810623169
                   to: 0.0720000267028809     [s; relative to TRIGTIME]
     T50: 0.0399999916553497 +/- 0.0144221930009071
        Measured from: 0.0120000243186951
                   to: 0.0520000159740448     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.456000000238419     
                   to: 0.543999999761581     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 0     
                   to: 0.0840000212192535     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.004553   0.015038   0.013616   0.003367
           0.001905   0.002150   0.002159   0.001673 [error]
 Peak      0.004979   0.019734   0.014379   0.001473
           0.005432   0.005501   0.004871   0.004135 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    0.084    0.000    0.084
T90     0.068    0.004    0.072
T50     0.040    0.012    0.052
Peak    1.000   -0.456    0.544
 
 
====== 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      -1.306    -0.239      0.235       -           -               -         2.46e-02     -4.49e-03          4.49e-03      59.820   57
CPL      0.555    -1.105      1.537       81.377     -17.784        37.023      1.69e-01     -1.69e-01          6.51e-01      50.430   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      -1.100     -0.541     0.603       -           -               -         3.18e-03     -1.06e-03          1.05e-03      53.720   57
CPL      0.022     -6.839     4.577       95.472     -44.193       -95.472      1.09e-02     -1.09e-02          1.89e+00      53.100   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   2.20e-09  4.55e-09  7.36e-09  2.67e-08  2.04e-08  4.08e-08   erg/cm2
      90%_error_low -6.05e-10 -9.06e-10 -1.49e-09 -9.08e-09 -3.87e-09 -1.06e-08   erg/cm2
      90%_error_hi   6.50e-10  8.98e-10  1.47e-09  1.09e-08  3.87e-09  1.19e-08   erg/cm2
Peak flux       PL   8.92e-02  1.14e-01  1.06e-01  1.74e-01  3.68e-01  4.84e-01   ph/cm2/s
      90%_error_low -5.13e-02 -4.73e-02 -3.80e-02 -1.01e-01 -1.26e-01 -1.60e-01   ph/cm2/s
      90%_error_hi   6.39e-02  4.58e-02  3.73e-02  1.66e-01  1.27e-01  1.71e-01   ph/cm2/s
 
Fluence        CPL   1.45e-09  5.45e-09  9.93e-09  7.23e-09  2.16e-08  2.41e-08   erg/cm2
      90%_error_low -6.47e-10 -1.15e-09 -2.20e-09 -4.56e-09 -4.33e-09 -6.07e-09   erg/cm2
      90%_error_hi   7.47e-10  1.19e-09  2.30e-09  8.01e-09  4.23e-09  8.07e-09   erg/cm2
Peak flux      CPL   7.03e-02  1.24e-01  1.18e-01  6.32e-02  3.54e-01  3.75e-01   ph/cm2/s
      90%_error_low -7.03e-02 -5.45e-02 -4.47e-02 -6.32e-02 -1.30e-01 -1.50e-01   ph/cm2/s
      90%_error_hi   7.43e-02  6.06e-02  4.80e-02  1.56e-01  1.31e-01  2.05e-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
       46.2357   -47.3880   0.0198    26.7281    -1.4857         0.0377199      9.671 TRIG_00259803                 
     
    Foreground time interval of the image:
      0.000   0.084 (delta_t =   0.084 [sec])
    Background time interval of the image:
    -239.700   0.000 (delta_t = 239.700 [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    0.000 sec. to    0.084 sec.
     
    Spectral model in power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: -1.30587     ( -0.238983   0.234633 )
    Norm@50keV  : 2.45562E-02    ( -0.00448936   0.00448908 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          59.82 using 59 PHA bins.
    # Reduced chi-squared =          1.049 for     57 degrees of freedom 
    # Null hypothesis probability =   3.738291e-01
     
    Photon flux (15-150 keV)    in 0.084 sec: 2.93271 ( -0.55246  0.55376 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 2.03577e-08 ( -3.87121e-09  3.87483e-09 ) ergs/cm2
     
    
    Cutoff power-law model
    Time interval is from    0.000 sec. to    0.084 sec.
    Spectral model in the cutoff power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: 0.554925     ( -1.10469   1.53749 )
    Epeak [keV] : 81.3767      ( -17.7843 37.0229 )
    Norm@50keV  : 0.168754    ( -0.168754   0.650865 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          50.43 using 59 PHA bins.
    # Reduced chi-squared =         0.9004 for     56 degrees of freedom 
    # Null hypothesis probability =   6.850107e-01
     
    Photon flux (15-150 keV)    in 0.084 sec: 2.99112 ( -0.54711  0.55046 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 2.16112e-08 ( -4.32618e-09  4.22684e-09 ) ergs/cm2
     
    

    1-s peak spectrum fit

    Power-law model
    Time interval is from   -0.456 sec. to    0.544 sec.
     
    Spectral model in power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: -1.09982     ( -0.540941   0.602846 )
    Norm@50keV  : 3.17555E-03    ( -0.00106288   0.00105175 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          53.72 using 59 PHA bins.
    # Reduced chi-squared =         0.9425 for     57 degrees of freedom 
    # Null hypothesis probability =   5.988853e-01
     
    Photon flux (15-150 keV)    in 1 sec: 0.368342 ( -0.125843  0.12747 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 3.32063e-08 ( -1.14643e-08  1.16496e-08 ) ergs/cm2
     
    
    Cutoff power-law model
    Time interval is from   -0.456 sec. to    0.544 sec.
    Spectral model in the cutoff power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: 0.0223411     ( -6.84006   4.57622 )
    Epeak [keV] : 95.4720      ( -44.1557 -95.4347 )
    Norm@50keV  : 1.09417E-02    ( -0.0109526   1.89188 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          53.10 using 59 PHA bins.
    # Reduced chi-squared =         0.9483 for     56 degrees of freedom 
    # Null hypothesis probability =   5.852108e-01
     
    Photon flux (15-150 keV)    in 1 sec: 0.353604 ( -0.129619  0.131479 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 3.08305e-08 ( -1.29903e-08  1.28161e-08 ) ergs/cm2
     
    

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot

    T90                                   = 0.06800002 sec.
    Hardness ratio (energy fluence ratio) = 1.61819173791
    

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

    S(15-50 keV)  = 6.741616e-09
    S(50-150 keV) = 1.3616557e-08
    

    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 = 5.033938484930026E-01, IMY = 1.305644198141932E-02
    

    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:
    -239.700000 0.000000
     
    # RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
    #  [deg]    [deg]    ['] [deg]  [deg]                   [']
    170.4811 -60.5219    3.5  42.9  129.7   1.9647   3.3    7.8	Cen X-3                       
    186.7919 -62.6890   14.0  42.6  141.5   0.3725   0.8    6.1	GX 301-2                      
    264.4847 -44.4165    4.5  57.1 -159.4   2.1709   2.6   11.2	4U 1735-44                    
     90.3937 -40.1253    2.7  42.5   50.4   2.6757   4.3 ------	UNKNOWN                       
    117.0550 -60.0443    2.5  32.1   90.4   1.4524   4.5 ------	UNKNOWN                       
     67.2324 -35.7503    3.3  41.2   22.3   1.0205   3.4 ------	UNKNOWN                       
    239.1698 -48.3236    2.7  56.9  179.3   4.2897   4.4 ------	UNKNOWN                       
     28.7215 -68.2676    2.6   5.5  -40.0   0.7238   4.5 ------	UNKNOWN                       
    255.6829 -48.8123    1.8  54.3 -167.8   3.6208   6.3 ------	UNKNOWN                       
    280.7204 -42.7562    4.3  55.3 -145.3   2.7698   2.7 ------	UNKNOWN                       
    

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

    Time interval of the image:
    0.000000 0.084000
     
    # RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
    #  [deg]    [deg]    ['] [deg]  [deg]                   [']
    170.2030 -60.7772    0.0  42.6  129.6   0.0281   2.2    9.8	Cen X-3                       
    186.4182 -62.7170    8.5  42.6  141.3  -0.0131  -1.3    7.3	GX 301-2                      
    264.6744 -44.4452    5.6  57.0 -159.2   0.0319   2.1    3.0	4U 1735-44                    
    104.9952 -46.6174    3.1  40.6   69.0   0.0530   3.7 ------	UNKNOWN                       
     46.2358 -47.3880    1.2  26.7   -1.5   0.0377   9.7 ------	UNKNOWN                       
    357.2513 -43.4822    2.1  34.4  -70.4   0.0364   5.6 ------	UNKNOWN                       
    

    Post-slew image of 15-350 keV band

    Time interval of the image:
    61.400600 962.389100
     
    # RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
    #  [deg]    [deg]    ['] [deg]  [deg]                   [']
     47.7286   5.1762    2.3  52.6    7.6   6.9004   5.0 ------	UNKNOWN                       
    204.6889 -74.8661    4.8  56.9  179.2   6.8708   2.4 ------	UNKNOWN                       
    231.9861 -80.9646    4.0  51.6 -173.1   3.5170   2.9 ------	UNKNOWN