Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Fri Jan 17 19:17:58 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger416115
======================================================================

  Trigger: 00416115      Segment: 000

  BAT Trigger Time: 290422685.12   [s; MET]
      Trigger Stop: 290422689.216   [s; MET]
               UTC: 2010-03-16T08:57:59.501360    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 32.2910617778291   Dec: -68.0089406869357  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.19
     Image Trigger?:     NO
     Rate S/N Ratio:     11.0905365064094  [ if not an image trigger ]
     Image S/N Ratio:    7.19

  Analysis Position:   [ source = BAT ]
    RA: 32.2910617778291   Dec: -68.0089406869357  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 32.3185629591155   Dec: -67.9914067680626  [deg; J2000]  
        { 02h 09m 16.5s , -67d 59' 29.1" }
         +/- 1.90794256818744 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.788423869823904 [arcmin] (formal 1-sigma fit error)
    SNR: 12.0867854157895
 
  Angular difference between the analysis and refined position is 1.220186 arcmin
 
  Partial Coding Fraction: 1.015625    [ including projection effects ]

  Duration
     T90: 9.26799994707108 +/- 1.86981498371424
        Measured from: -2.65200001001358
                   to: 6.6159999370575     [s; relative to TRIGTIME]
     T50: 4.0239999294281 +/- 1.38675450094623
        Measured from: -0.124000012874603
                   to: 3.8999999165535     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 2.11599999666214     
                   to: 3.11599999666214     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -3.02799999713898     
                   to: 6.90399998426437     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.099771   0.108745   0.092996   0.037993
           0.014700   0.015293   0.013558   0.012027 [error]
 Peak      0.012639   0.014365   0.019105   0.009937
           0.004696   0.005011   0.004272   0.003866 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    9.932   -3.028    6.904
T90     9.268   -2.652    6.616
T50     4.024   -0.124    3.900
Peak    1.000    2.116    3.116
 
 
====== 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      -1.570    -0.263      0.254       -           -               -         1.95e-03     -3.02e-04          2.95e-04      49.050   57
CPL     -1.485    -0.347      0.912      289.876    -289.876      -289.876      2.16e-03     -5.12e-04          4.17e-03      49.090   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      -0.979     -0.506     0.563       -           -               -         3.31e-03     -9.34e-04          9.04e-04      56.820   57
CPL     -0.905      0.905     2.224      867.630      N/A           N/A         3.57e-03        N/A               N/A         56.860   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   2.64e-08  4.65e-08  6.27e-08  1.74e-07  1.82e-07  3.09e-07   erg/cm2
      90%_error_low -5.80e-09 -6.54e-09 -1.31e-08 -6.55e-08 -3.05e-08 -7.87e-08   erg/cm2
      90%_error_hi   6.07e-09  6.52e-09  1.31e-08  8.83e-08  3.12e-08  9.77e-08   erg/cm2
Peak flux       PL   8.29e-02  1.14e-01  1.16e-01  2.13e-01  3.81e-01  5.26e-01   ph/cm2/s
      90%_error_low -4.48e-02 -4.25e-02 -3.38e-02 -1.13e-01 -1.07e-01 -1.49e-01   ph/cm2/s
      90%_error_hi   5.61e-02  4.03e-02  3.27e-02  1.83e-01  1.08e-01  1.66e-01   ph/cm2/s
 
Fluence        CPL   2.65e-08  4.64e-08  6.27e-08  1.78e-07  1.82e-07  3.07e-07   erg/cm2
      90%_error_low -3.84e-09 -6.29e-09 -1.20e-08 -1.39e-07 -3.44e-08 -1.38e-07   erg/cm2
      90%_error_hi   4.77e-09  7.12e-09  1.36e-08  4.41e-08  2.45e-08  5.17e-08   erg/cm2
Peak flux      CPL   8.70e-02  1.14e-01  1.15e-01  2.30e-01  3.84e-01  5.40e-01   ph/cm2/s
      90%_error_low     N/A       N/A   -3.33e-02     N/A       N/A   -5.40e-01   ph/cm2/s
      90%_error_hi      N/A       N/A    4.26e-02     N/A       N/A    1.54e-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
   32.3186   -67.9914   0.0159     6.8226    -4.3614         0.3437399     12.087 TRIG_00416115                 
 
Foreground time interval of the image:
 -3.028   6.904 (delta_t =   9.932 [sec])
Background time interval of the image:
-239.120  -3.028 (delta_t = 236.092 [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   -3.028 sec. to    6.904 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.56987     ( -0.263145   0.254157 )
Norm@50keV  : 1.95225E-03    ( -0.000301761   0.000294819 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.05 using 59 PHA bins.
# Reduced chi-squared =         0.8606 for     57 degrees of freedom 
# Null hypothesis probability =   7.638575e-01
 
Photon flux (15-150 keV)    in 9.932 sec: 0.248596 ( -0.034628  0.034644 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.82061e-07 ( -3.04963e-08  3.11884e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -3.028 sec. to    6.904 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.56781     ( -0.338328   0.920202 )
Epeak [keV] : 9996.90      ( -9997.44 -9997.44 )
Norm@50keV  : 1.95729E-03    ( -0.000304204   0.00438218 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.05 using 59 PHA bins.
# Reduced chi-squared =         0.8760 for     56 degrees of freedom 
# Null hypothesis probability =   7.330188e-01
 
Photon flux (15-150 keV)    in 9.932 sec: 0.248858 ( -0.036077  0.034542 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.82405e-07 ( -3.44307e-08  2.45359e-08 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from    2.116 sec. to    3.116 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.97947     ( -0.506402   0.563136 )
Norm@50keV  : 3.31094E-03    ( -0.000933966   0.000904442 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.82 using 59 PHA bins.
# Reduced chi-squared =         0.9969 for     57 degrees of freedom 
# Null hypothesis probability =   4.817309e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.380807 ( -0.106718  0.107681 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.60712e-08 ( -1.03548e-08  1.04756e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from    2.116 sec. to    3.116 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.75465     ( 2.75525   4.0738 )
Epeak [keV] : 221.852      (   )
Norm@50keV  : 3.55587E-04    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.19 using 59 PHA bins.
# Reduced chi-squared =          1.003 for     56 degrees of freedom 
# Null hypothesis probability =   4.679081e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.383920 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.62068e-08 ( -1.13297e-08  1.09115e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 9.268 sec.
Hardness ratio (energy fluence ratio) = 1.34737961679

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

    S(15-50 keV)  = 7.298635e-08
S(50-150 keV) = 1.0907297e-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 = 1.192961137551998E-01, IMY = 9.098437706870487E-03

    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:
-239.120000 -3.028000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
264.8028 -44.4388    7.1  54.1  168.9  -1.2444  -1.6    2.7	4U 1735-44                    
255.6870 -48.8281    1.9  52.2  159.7   4.4574   5.9 ------	UNKNOWN                       
310.3118 -30.1882    2.4  54.0 -143.3   5.6476   4.8 ------	UNKNOWN

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

    Time interval of the image:
-3.028000 6.904000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
264.6211 -44.5714    4.3  54.1  168.7  -0.3890  -2.7    9.0	4U 1735-44                    
111.9779 -49.4695    2.3  45.4   48.5   0.6589   5.1 ------	UNKNOWN                       
164.4811 -70.7454    2.1  35.8   96.5   0.4040   5.5 ------	UNKNOWN                       
 32.3186 -67.9914    1.0   6.8   -4.4   0.3437  12.1 ------	UNKNOWN                       
 59.2283 -36.4748    2.5  41.7  -10.5   0.1977   4.6 ------	UNKNOWN                       
 47.5823 -42.3193    2.6  33.4  -21.7   0.1500   4.4 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
62.380610 902.901200
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
165.0684 -68.2340    2.6  39.9  103.9   6.9342   4.4 ------	UNKNOWN                       
115.7255 -59.7060    3.2  34.7   67.3   3.4829   3.7 ------	UNKNOWN                       
 63.3972 -38.7037    2.5  33.9   -4.7   2.7878   4.7 ------	UNKNOWN                       
 28.5788 -53.8672    2.8  14.2  -60.0   1.8325   4.1 ------	UNKNOWN                       
337.7058 -45.7524    3.3  35.4 -130.4   2.6511   3.5 ------	UNKNOWN                       
357.3838 -42.6524    2.9  31.3 -105.1   2.8968   4.0 ------	UNKNOWN