Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Fri Jan 17 15:29:34 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger436737
======================================================================

  Trigger: 00436737      Segment: 000

  BAT Trigger Time: 309310848   [s; MET]
      Trigger Stop: 309310912   [s; MET]
               UTC: 2010-10-20T23:40:41.709060    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 189.566423306271   Dec: 23.1609361221947  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    13.24
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    13.24

  Analysis Position:   [ source = BAT ]
    RA: 189.566423306271   Dec: 23.1609361221947  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 189.576407827723   Dec: 23.18286537218  [deg; J2000]  
        { 12h 38m 18.3s , +23d 10' 58.3" }
         +/- 1.77243961034988 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.763091014324163 [arcmin] (formal 1-sigma fit error)
    SNR: 13.4281539841749
 
  Angular difference between the analysis and refined position is 1.426369 arcmin
 
  Partial Coding Fraction: 0.4296875    [ including projection effects ]

  Duration
     T90: 172.336000025272 +/- 29.2958033946059
        Measured from: -33.0479999780655
                   to: 139.288000047207     [s; relative to TRIGTIME]
     T50: 72.3360000252724 +/- 18.4150842352333
        Measured from: -2.05599999427795
                   to: 70.2800000309944     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -15.3640000224113     
                   to: -14.3640000224113     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -43.7519999742508     
                   to: 164.871999979019     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.583107   1.894857   0.768568   0.230673
           0.132182   0.130562   0.118649   0.113421 [error]
 Peak      0.022940   0.018330   0.031594   0.011053
           0.009106   0.009058   0.007990   0.007430 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  208.624  -43.752  164.872
T90   172.336  -33.048  139.288
T50    72.336   -2.056   70.280
Peak    1.000  -15.364  -14.364
 
 
====== 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      -2.073    -0.178      0.170       -           -               -         1.32e-03     -1.49e-04          1.46e-04      63.950   57
CPL     -1.608    -0.528      0.871       35.153     -27.434       -35.153      2.44e-03        N/A               N/A         62.760   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      -1.539     -0.773     0.689       -           -               -         4.76e-03     -1.89e-03          1.82e-03      50.820   57
CPL     -0.627     -2.087     0.627       88.159     -88.159       -88.159      1.18e-02     -1.18e-02          1.98e+02      50.580   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   6.05e-07  7.85e-07  7.46e-07  1.26e-06  2.56e-06  3.39e-06   erg/cm2
      90%_error_low -7.64e-08 -6.84e-08 -1.15e-07 -3.49e-07 -2.60e-07 -4.83e-07   erg/cm2
      90%_error_hi   7.86e-08  6.84e-08  1.17e-07  4.31e-07  2.65e-07  5.44e-07   erg/cm2
Peak flux       PL   2.03e-01  2.00e-01  1.38e-01  1.49e-01  6.00e-01  6.90e-01   ph/cm2/s
      90%_error_low -1.19e-01 -8.35e-02 -6.88e-02 -1.49e-01 -2.32e-01 -2.59e-01   ph/cm2/s
      90%_error_hi   1.50e-01  8.04e-02  6.48e-02  1.99e-01  2.34e-01  2.62e-01   ph/cm2/s
 
Fluence        CPL   5.78e-07  8.26e-07  7.27e-07  5.58e-07  2.43e-06  2.69e-06   erg/cm2
      90%_error_low -8.84e-08 -9.13e-08 -1.37e-07 -3.88e-07 -3.13e-07 -5.20e-07   erg/cm2
      90%_error_hi   8.71e-08  9.57e-08  1.28e-07  1.15e-06  3.25e-07  1.26e-06   erg/cm2
Peak flux      CPL   1.53e-01  2.05e-01  1.55e-01  8.12e-02  5.64e-01  6.00e-01   ph/cm2/s
      90%_error_low -1.53e-01 -1.56e-01     N/A   -8.12e-02 -3.35e-01 -6.00e-01   ph/cm2/s
      90%_error_hi   2.48e-01  9.24e-02     N/A    1.83e-01  2.58e-01  3.28e-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
  189.5764    23.1829   0.0144    39.1984   -41.9162         4.8532735     13.428 TRIG_00436737                 
 
Foreground time interval of the image:
-43.752 164.872 (delta_t = 208.624 [sec])
Background time interval of the image:
-239.000 -43.752 (delta_t = 195.248 [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  -43.752 sec. to  164.872 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.07327     ( -0.177887   0.169607 )
Norm@50keV  : 1.32160E-03    ( -0.000148839   0.000145772 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          63.95 using 59 PHA bins.
# Reduced chi-squared =          1.122 for     57 degrees of freedom 
# Null hypothesis probability =   2.456834e-01
 
Photon flux (15-150 keV)    in 208.6 sec: 0.205237 ( -0.018011  0.018029 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.55566e-06 ( -2.59914e-07  2.64826e-07 ) ergs/cm2
    Cutoff power-law model
    Time interval is from  -43.752 sec. to  164.872 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.60784     ( -0.527694   0.871345 )
Epeak [keV] : 35.1526      ( -27.4348 -35.1532 )
Norm@50keV  : 2.44334E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          62.76 using 59 PHA bins.
# Reduced chi-squared =          1.121 for     56 degrees of freedom 
# Null hypothesis probability =   2.492082e-01
 
Photon flux (15-150 keV)    in 208.6 sec: 0.200617 ( -0.019433  0.019363 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.43054e-06 ( -3.13382e-07  3.24853e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from  -15.364 sec. to  -14.364 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.53855     ( -0.773291   0.688758 )
Norm@50keV  : 4.75629E-03    ( -0.00189251   0.00181738 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.82 using 59 PHA bins.
# Reduced chi-squared =         0.8917 for     57 degrees of freedom 
# Null hypothesis probability =   7.045838e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.600159 ( -0.231855  0.234252 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.4857e-08 ( -1.84627e-08  1.89223e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from  -15.364 sec. to  -14.364 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.627461     ( -2.088   0.626314 )
Epeak [keV] : 88.1587      ( -88.1378 -88.1378 )
Norm@50keV  : 1.17836E-02    ( -0.0120632   197.942 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.58 using 59 PHA bins.
# Reduced chi-squared =         0.9033 for     56 degrees of freedom 
# Null hypothesis probability =   6.792832e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.564390 ( -0.335026  0.257704 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.90008e-08 ( -2.87638e-08  2.28482e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 172.336 sec.
Hardness ratio (energy fluence ratio) = 0.950517271044

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

    S(15-50 keV)  = 1.3899969e-06
S(50-150 keV) = 1.1656719e-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 

    IMX = 6.068572353274657E-01, IMY = 5.448124093499392E-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:
-239.000000 -43.752000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
244.9718 -15.6404    0.5  47.4 -147.9  10.1508  23.9    0.4	Sco X-1                       
254.2713  35.3170    8.4  18.5  116.6  -0.2705  -1.4    9.2	Her X-1                       
268.2948  -1.5291    4.9  46.3  174.8   0.9400   2.4    6.3	SW J1753.5-0127               
212.0767  61.0575    2.4  33.7   29.7   1.1771   4.8 ------	UNKNOWN                       
216.0104   9.6604    3.2  26.0  -91.1   0.8463   3.6 ------	UNKNOWN                       
212.7780  -6.1133    3.3  41.3 -100.7   3.1369   3.5 ------	UNKNOWN

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

    Time interval of the image:
-43.752000 164.872000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
244.8938 -15.6999    6.9  47.4 -147.8  -0.8939  -1.7    6.1	Sco X-1                       
254.4173  35.4557    7.2  18.7  116.2  -0.4042  -1.6    7.1	Her X-1                       
268.5208  -1.4857    8.1  46.4  174.6   0.6650   1.4    9.4	SW J1753.5-0127               
262.6656 -21.4513    2.5  59.1 -164.6   6.2886   4.6 ------	UNKNOWN                       
224.4250   6.0101    3.0  25.6 -112.1   1.0757   3.9 ------	UNKNOWN                       
189.5764  23.1829    0.9  39.2  -41.9   4.8528  13.4 ------	UNKNOWN                       
204.3943   0.0531    1.8  40.7  -84.9   5.4315   6.3 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
372.500610 483.020000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.7110 -40.5819    5.0  58.3 -154.6 -10.3533  -2.3    8.5	Vela X-1                      
170.5675 -60.6752    7.3  39.3 -124.3  -1.9890  -1.6    8.0	Cen X-3                       
186.3094 -62.8853    6.6  36.6 -112.5   2.3100   1.7   11.8	GX 301-2                      
264.6490 -44.3265    5.2  44.9  -39.0  -2.8806  -2.2    8.4	4U 1735-44                    
276.0120 -30.3445    5.8  56.6  -23.7   5.7877   2.0    4.7	H1820-303                     
303.7116 -26.9518    2.4  55.8    5.9  20.4629   4.9 ------	UNKNOWN                       
303.4571 -43.9277    2.3  39.1    1.9   5.0689   5.0 ------	UNKNOWN                       
159.6908 -50.7877    3.1  49.2 -133.1  11.6307   3.8 ------	UNKNOWN