Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Sun Jan 19 13:53:10 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger370846
======================================================================

  Trigger: 00370846      Segment: 000

  BAT Trigger Time: 275738842.048   [s; MET]
      Trigger Stop: 275738842.56   [s; MET]
               UTC: 2009-09-27T10:07:16.926760    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 343.953096034345   Dec: -70.9775664473784  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    11.42
     Image Trigger?:     NO
     Rate S/N Ratio:     25.8263431402899  [ if not an image trigger ]
     Image S/N Ratio:    11.42

  Analysis Position:   [ source = BAT ]
    RA: 343.953096034345   Dec: -70.9775664473784  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 343.928634147261   Dec: -70.9731494448479  [deg; J2000]  
        { 22h 55m 42.9s , -70d 58' 23.3" }
         +/- 1.5813548988806 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.719989397380717 [arcmin] (formal 1-sigma fit error)
    SNR: 15.804863141897
 
  Angular difference between the analysis and refined position is 0.546935 arcmin
 
  Partial Coding Fraction: 0.5546875    [ including projection effects ]

  Duration
     T90: 2.1599999666214 +/- 0.400898948808123
        Measured from: 0.10400003194809
                   to: 2.26399999856949     [s; relative to TRIGTIME]
     T50: 0.807999968528748 +/- 0.31346449706629
        Measured from: 0.319999992847443
                   to: 1.12799996137619     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.0079999566078186     
                   to: 0.992000043392181     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 0.0240000486373901     
                   to: 2.43999999761581     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.102704   0.141373   0.081110   0.014561
           0.012102   0.012570   0.011264   0.011032 [error]
 Peak      0.065043   0.096346   0.051847   0.007888
           0.008167   0.008866   0.007982   0.007438 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    2.416    0.024    2.440
T90     2.160    0.104    2.264
T50     0.808    0.320    1.128
Peak    1.000   -0.008    0.992
 
 
====== 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      -1.796    -0.202      0.193       -           -               -         8.89e-03     -1.14e-03          1.11e-03      78.920   57
CPL     -1.301    -0.412      0.883       61.952     -19.123       -61.952      1.68e-02     -1.04e-02          3.55e-02      77.600   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      -1.713     -0.203     0.195       -           -               -         1.42e-02     -1.88e-03          1.85e-03      72.460   57
CPL     -0.670     -0.878     1.163       55.136     -12.027        63.343      5.50e-02     -5.50e-02          1.99e-01      68.200   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   3.62e-08  5.56e-08  6.41e-08  1.41e-07  1.98e-07  2.97e-07   erg/cm2
      90%_error_low -5.67e-09 -5.94e-09 -1.10e-08 -4.38e-08 -2.55e-08 -5.60e-08   erg/cm2
      90%_error_hi   5.84e-09  5.93e-09  1.12e-08  5.54e-08  2.60e-08  6.54e-08   erg/cm2
Peak flux       PL   7.17e-01  6.37e-01  3.89e-01  3.59e-01  1.90e+00  2.10e+00   ph/cm2/s
      90%_error_low -1.20e-01 -7.30e-02 -6.61e-02 -1.06e-01 -2.17e-01 -2.47e-01   ph/cm2/s
      90%_error_hi   1.24e-01  7.30e-02  6.66e-02  1.30e-01  2.17e-01  2.49e-01   ph/cm2/s
 
Fluence        CPL    N/A      N/A      N/A      N/A      N/A      N/A      erg/cm2
      90%_error_low -5.67e-09 -5.94e-09 -1.10e-08 -4.38e-08 -2.55e-08 -5.60e-08   erg/cm2
      90%_error_hi   5.84e-09  5.93e-09  1.12e-08  5.54e-08  2.60e-08  6.54e-08   erg/cm2
Peak flux      CPL   6.41e-01  7.16e-01  3.90e-01  1.05e-01  1.83e+00  1.85e+00   ph/cm2/s
      90%_error_low -1.39e-01 -9.92e-02 -8.13e-02 -1.05e-01 -2.24e-01 -2.39e-01   ph/cm2/s
      90%_error_hi   1.41e-01  1.05e-01  7.69e-02  1.85e-01  2.24e-01  2.67e-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
      343.9286   -70.9731   0.0121    27.1289   129.1528         0.3613818     15.805 TRIG_00370846                 
     
    Foreground time interval of the image:
      0.024   2.440 (delta_t =   2.416 [sec])
    Background time interval of the image:
    -239.048   0.024 (delta_t = 239.072 [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    0.024 sec. to    2.440 sec.
     
    Spectral model in power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: -1.79615     ( -0.201623   0.193281 )
    Norm@50keV  : 8.89137E-03    ( -0.00113526   0.00111183 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          78.92 using 59 PHA bins.
    # Reduced chi-squared =          1.384 for     57 degrees of freedom 
    # Null hypothesis probability =   2.891445e-02
     
    Photon flux (15-150 keV)    in 2.416 sec: 1.22345 ( -0.13095  0.13098 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 1.97818e-07 ( -2.5482e-08  2.6016e-08 ) ergs/cm2
     
    
    Cutoff power-law model
    Time interval is from    0.024 sec. to    2.440 sec.
    Spectral model in the cutoff power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: -1.30115     ( -0.412313   0.883059 )
    Epeak [keV] : 61.9516      ( -19.123 -61.9516 )
    Norm@50keV  : 1.68107E-02    ( -0.010374   0.0354842 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          77.60 using 59 PHA bins.
    # Reduced chi-squared =          1.386 for     56 degrees of freedom 
    # Null hypothesis probability =   2.958503e-02
     
    Photon flux (15-150 keV)    in 2.416 sec: 1.19859 ( -0.1359  0.13587 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2
     
    

    1-s peak spectrum fit

    Power-law model
    Time interval is from   -0.008 sec. to    0.992 sec.
     
    Spectral model in power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: -1.71279     ( -0.202761   0.194838 )
    Norm@50keV  : 1.42068E-02    ( -0.0018813   0.00184872 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          72.46 using 59 PHA bins.
    # Reduced chi-squared =          1.271 for     57 degrees of freedom 
    # Null hypothesis probability =   8.139668e-02
     
    Photon flux (15-150 keV)    in 1 sec: 1.89541 ( -0.21677  0.2168 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 1.31432e-07 ( -1.80406e-08  1.84191e-08 ) ergs/cm2
     
    
    Cutoff power-law model
    Time interval is from   -0.008 sec. to    0.992 sec.
    Spectral model in the cutoff power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: -0.670153     ( -0.878345   1.16344 )
    Epeak [keV] : 55.1356      ( -12.0273 63.3437 )
    Norm@50keV  : 5.49951E-02    ( -0.0549954   0.198594 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          68.20 using 59 PHA bins.
    # Reduced chi-squared =          1.218 for     56 degrees of freedom 
    # Null hypothesis probability =   1.270433e-01
     
    Photon flux (15-150 keV)    in 1 sec: 1.82699 ( -0.22386  0.22399 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 1.18498e-07 ( -1.96837e-08  2.10103e-08 ) 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 = -3.235003087383637E-01, IMY = -3.973183775783828E-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:
    -239.048000 0.024000
     
    # RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
    #  [deg]    [deg]    ['] [deg]  [deg]                   [']
    170.0261 -60.6619  347.9  37.5 -132.5  -0.0124  -0.0    8.8	Cen X-3                       
    186.6843 -62.7498  158.4  30.6 -124.9  -0.0212  -0.1    1.4	GX 301-2                      
    244.9663 -15.6435    0.7  52.7  -27.8   9.9837  16.2    0.8	Sco X-1                       
    255.9619 -37.8166    0.8  29.4  -17.0   2.9420  14.6    2.0	4U 1700-377                   
    256.3477 -36.4348    2.3  30.8  -16.2   1.0770   5.0    4.3	GX 349+2                      
    263.1413 -24.6886  229.2  42.3   -5.5  -0.0159  -0.1    8.0	GX 1+4                        
    264.5620 -44.3310    3.5  22.7   -2.8   0.6360   3.3   10.5	4U 1735-44                    
    270.2364 -25.0774    5.3  42.2    4.1   0.7877   2.2    2.6	GX 5-1                        
    270.2693 -25.6901    3.1  41.6    4.2   1.3311   3.7    3.6	GRS 1758-258                  
    274.0860 -14.0437    5.1  53.5    7.7   1.7223   2.3    4.7	GX 17+2                       
    275.9297 -30.4008    3.5  37.4   12.8   0.9564   3.3    2.0	H1820-303                     
    285.1578 -24.8875    9.4  44.3   23.6   0.5913   1.2    6.9	HT1900.1-2455                 
    262.9255 -33.8038    9.6  33.2   -5.8  -0.2949  -1.2    3.7	GX 354-0                      
     52.7207 -59.0148    3.4  52.0  154.9   3.6910   3.4 ------	UNKNOWN                       
    255.2339 -41.6557    2.5  25.7  -19.1   0.9111   4.7 ------	UNKNOWN                       
    

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

    Time interval of the image:
    0.024000 2.440000
     
    # RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
    #  [deg]    [deg]    ['] [deg]  [deg]                   [']
    170.4330 -60.6139    3.8  37.4 -132.2  -0.0927  -3.1    3.5	Cen X-3                       
    186.3544 -62.7589    5.6  30.7 -125.1  -0.0493  -2.0    8.3	GX 301-2                      
    244.8666 -15.6764    9.0  52.7  -27.9   0.0750   1.3    6.9	Sco X-1                       
    255.8016 -37.8821   10.9  29.4  -17.3   0.0199   1.1    9.1	4U 1700-377                   
    256.4345 -36.4432  211.1  30.8  -16.1   0.0011   0.1    1.2	GX 349+2                      
    262.9957 -24.7507 2138.7  42.2   -5.7  -0.0001  -0.0    0.8	GX 1+4                        
    264.7978 -44.6032    6.6  22.4   -2.3   0.0316   1.7    9.5	4U 1735-44                    
    270.3714 -24.9954  101.1  42.3    4.2   0.0032   0.1    6.9	GX 5-1                        
    270.3961 -25.7414    7.7  41.5    4.3  -0.0409  -1.5    5.1	GRS 1758-258                  
    274.0209 -13.9818   16.8  53.5    7.6  -0.0484  -0.7    3.4	GX 17+2                       
    275.9998 -30.2880    4.5  37.5   12.9   0.0647   2.6    6.1	H1820-303                     
    285.0010 -25.0680    5.6  44.1   23.4  -0.0821  -2.1    9.1	HT1900.1-2455                 
    262.9503 -33.7980    6.3  33.2   -5.8   0.0379   1.8    2.9	GX 354-0                      
    347.9556 -53.3741    2.3  40.7  108.2   0.3807   5.0 ------	UNKNOWN                       
    343.9288 -70.9732    0.7  27.1  129.2   0.3613  15.8 ------	UNKNOWN                       
     58.6992 -63.4265    2.6  48.4  159.9   0.2194   4.4 ------	UNKNOWN                       
    280.8838 -26.2075    2.0  42.3   18.5   0.1882   5.9 ------	UNKNOWN                       
    279.8275 -63.7157    2.3   7.8   67.1   0.0820   5.0 ------	UNKNOWN                       
    

    Post-slew image of 15-350 keV band

    Time interval of the image:
    406.452600 638.552590
     
    # RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
    #  [deg]    [deg]    ['] [deg]  [deg]                   [']
    263.0771 -24.5935   11.7  45.1  -50.5  -0.5750  -1.0    9.9	GX 1+4                        
    264.8178 -44.3228    7.7  36.7  -78.1  -0.6020  -1.5    8.3	4U 1735-44                    
    268.3311  -1.4685    7.1  56.1  -23.2   1.1278   1.6    2.4	SW J1753.5-0127               
    270.1871 -25.1239    8.5  39.3  -46.2   0.4632   1.4    5.9	GX 5-1                        
    270.1428 -25.6524    0.0  39.1  -46.9   0.6267   1.9   10.2	GRS 1758-258                  
    273.9206 -14.0030    4.6  43.3  -29.5   0.8286   2.5    5.4	GX 17+2                       
    275.9507 -30.3553   23.6  32.4  -49.8  -0.1163  -0.5    1.5	H1820-303                     
    285.0009 -24.8971    5.7  28.3  -32.3   0.4128   2.0    2.4	HT1900.1-2455                 
    288.7665  10.9411    3.2  55.2    5.8   2.8212   3.5    1.9	GRS 1915+105                  
    262.9693 -33.7877   66.6  41.0  -62.6   0.0944   0.2    3.0	GX 354-0                      
    297.6792  13.1710    3.4  54.4   16.7   3.5138   3.4 ------	UNKNOWN                       
    298.1918   0.2666    2.5  41.9   12.2   1.1847   4.6 ------	UNKNOWN                       
     49.5919 -62.8239    2.6  58.3 -175.7   5.7127   4.4 ------	UNKNOWN                       
      5.7023 -71.6122    2.8  41.5 -165.2   1.0796   4.2 ------	UNKNOWN                       
     51.9597 -67.0701    3.3  57.5 -170.6   3.0221   3.5 ------	UNKNOWN                       
     60.5531 -69.7183    3.2  59.1 -166.2   4.3238   3.7 ------	UNKNOWN