Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Mon Jan 20 02:32:30 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger310613
======================================================================

  Trigger: 00310613      Segment: 000

  BAT Trigger Time: 231277984.832   [s; MET]
      Trigger Stop: 231277985.344   [s; MET]
               UTC: 2008-04-30T19:53:02.075640    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 165.322321743452   Dec: 51.6894257321077  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    10.83
     Image Trigger?:     NO
     Rate S/N Ratio:     19.3390796058137  [ if not an image trigger ]
     Image S/N Ratio:    10.83

  Analysis Position:   [ source = BAT ]
    RA: 165.322321743452   Dec: 51.6894257321077  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 165.328643441155   Dec: 51.6815222003603  [deg; J2000]  
        { 11h 01m 18.9s , +51d 40' 53.5" }
         +/- 0.694349954333688 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.2616031070918 [arcmin] (formal 1-sigma fit error)
    SNR: 51.2194529072589
 
  Angular difference between the analysis and refined position is 0.529317 arcmin
 
  Partial Coding Fraction: 1.015625    [ including projection effects ]

  Duration
     T90: 13.8720000088215 +/- 1.89973156912445
        Measured from: 0.376000016927719
                   to: 14.2480000257492     [s; relative to TRIGTIME]
     T50: 4.87999999523163 +/- 0.350907413302386
        Measured from: 1.75600001215935
                   to: 6.63600000739098     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 1.70400002598763     
                   to: 2.70400002598763     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.299999982118607     
                   to: 17.3640000224113     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.733599   0.808894   0.498701   0.112318
           0.022375   0.023641   0.021848   0.021681 [error]
 Peak      0.115149   0.123691   0.080592   0.019099
           0.006226   0.006588   0.006057   0.005466 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   17.664   -0.300   17.364
T90    13.872    0.376   14.248
T50     4.880    1.756    6.636
Peak    1.000    1.704    2.704
 
 
====== 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      -1.734    -0.080      0.079       -           -               -         7.17e-03     -2.91e-04          2.90e-04      57.560   57
CPL     -1.726     1.726      0.162     9854.160      N/A           N/A         7.23e-03        N/A               N/A         57.660   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      -1.751     -0.121     0.118       -           -               -         1.97e-02     -1.38e-03          1.37e-03      61.110   57
CPL     -1.645     -0.401     0.489      151.587      N/A           N/A         2.25e-02        N/A               N/A         60.960   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   2.01e-07  3.21e-07  3.86e-07  9.07e-07  1.17e-06  1.82e-06   erg/cm2
      90%_error_low -1.38e-08 -1.25e-08 -2.23e-08 -1.12e-07 -4.99e-08 -1.28e-07   erg/cm2
      90%_error_hi   1.42e-08  1.24e-08  2.24e-08  1.23e-07  5.02e-08  1.37e-07   erg/cm2
Peak flux       PL   1.03e+00  8.95e-01  5.32e-01  4.75e-01  2.66e+00  2.93e+00   ph/cm2/s
      90%_error_low -1.02e-01 -5.48e-02 -5.02e-02 -8.50e-02 -1.62e-01 -1.80e-01   ph/cm2/s
      90%_error_hi   1.05e-01  5.47e-02  5.03e-02  9.63e-02  1.63e-01  1.81e-01   ph/cm2/s
 
Fluence        CPL   2.01e-07  3.19e-07  3.86e-07  9.05e-07  1.19e-06  1.83e-06   erg/cm2
      90%_error_low -1.39e-08    N/A       N/A       N/A    -6.21e-08 -2.78e-07   erg/cm2
      90%_error_hi   1.42e-08    N/A       N/A       N/A     3.25e-08  4.76e-08   erg/cm2
Peak flux      CPL   1.02e+00  9.05e-01  5.33e-01  4.07e-01  2.65e+00  2.86e+00   ph/cm2/s
      90%_error_low -1.20e-01 -6.22e-02 -5.09e-02 -1.93e-01 -1.77e-01 -2.79e-01   ph/cm2/s
      90%_error_hi   1.09e-01  6.85e-02  5.15e-02  1.32e-01  1.74e-01  2.47e-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
  165.3286    51.6815   0.0038     7.6922    34.6929         1.9437808     51.219 TRIG_00310613                 
 
Foreground time interval of the image:
 -0.300  10.069 (delta_t =  10.369 [sec])
Background time interval of the image:
-194.331  -0.300 (delta_t = 194.031 [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   -0.300 sec. to   17.364 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.73364     ( -0.0798218   0.0790812 )
Norm@50keV  : 7.17119E-03    ( -0.000291497   0.000289762 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.56 using 59 PHA bins.
# Reduced chi-squared =          1.010 for     57 degrees of freedom 
# Null hypothesis probability =   4.543034e-01
 
Photon flux (15-150 keV)    in 17.66 sec: 0.963927 ( -0.037907  0.038063 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.16993e-06 ( -4.98741e-08  5.02385e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -0.300 sec. to   17.364 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.01447     ( 2.01447   0.450894 )
Epeak [keV] : 6.12505      (   )
Norm@50keV  : 5.23452E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.67 using 59 PHA bins.
# Reduced chi-squared =         0.9941 for     56 degrees of freedom 
# Null hypothesis probability =   4.872450e-01
 
Photon flux (15-150 keV)    in 17.66 sec: 0.976909 ( -0.050978  0.024961 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.18744e-06 ( -6.21311e-08  3.2481e-08 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from    1.704 sec. to    2.704 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.75064     ( -0.120563   0.118049 )
Norm@50keV  : 1.96948E-02    ( -0.0013827   0.00136539 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.11 using 59 PHA bins.
# Reduced chi-squared =          1.072 for     57 degrees of freedom 
# Null hypothesis probability =   3.305504e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.66382 ( -0.16243  0.16258 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.81752e-07 ( -1.32326e-08  1.34211e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from    1.704 sec. to    2.704 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.64516     ( -0.400297   0.489217 )
Epeak [keV] : 151.587      (   )
Norm@50keV  : 2.24794E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.96 using 59 PHA bins.
# Reduced chi-squared =          1.089 for     56 degrees of freedom 
# Null hypothesis probability =   3.022786e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.64757 ( -0.17673  0.17354 ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 13.872 sec.
Hardness ratio (energy fluence ratio) = 1.20281788581

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

    S(15-50 keV)  = 5.225057e-07
S(50-150 keV) = 6.474155e-07

    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 = 1.110536330879647E-01, IMY = -7.687688889994855E-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:
-194.331400 -0.300000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
192.7980  24.0656    2.8  39.6   81.3   2.8873   4.2 ------	UNKNOWN                       
192.8996  24.4278    3.0  39.4   80.8   2.9385   4.4 ------	UNKNOWN                       
126.2109  -2.3063    3.4  56.9  179.3   3.3521   3.4 ------	UNKNOWN                       
247.3321  79.9897    2.0  42.2  -19.2   1.4684   5.8 ------	UNKNOWN                       
312.0798  80.7695    2.6  49.2  -29.7   1.8053   4.5 ------	UNKNOWN                       
 79.3441  61.7435    3.4  41.2  -77.9   2.5158   3.4 ------	UNKNOWN

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

    Time interval of the image:
-0.300000 10.068600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
165.3286  51.6815    0.2   7.7   34.7   1.9438  51.2 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
37.468600 962.170500
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
134.6232   0.9533    5.1  56.9  179.1   6.8024   2.3 ------	UNKNOWN                       
286.6951  61.6084    3.0  57.5   -9.6  10.1525   3.9 ------	UNKNOWN                       
 84.3418  64.9733    4.2  41.2  -77.8   6.5885   2.8 ------	UNKNOWN                       
106.4976  25.7306    3.9  51.0 -135.6   9.2966   2.9 ------	UNKNOWN