Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Sun Jan 19 19:58:32 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger337115
======================================================================

  Trigger: 00337115      Segment: 000

  BAT Trigger Time: 250688894.016   [s; MET]
      Trigger Stop: 250688896.064   [s; MET]
               UTC: 2008-12-11T11:48:10.690660    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 328.087288181771   Dec: -33.8149123552862  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    6.53
     Image Trigger?:     NO
     Rate S/N Ratio:     7.41619848709566  [ if not an image trigger ]
     Image S/N Ratio:    6.53

  Analysis Position:   [ source = BAT ]
    RA: 328.087288181771   Dec: -33.8149123552862  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 328.079885243816   Dec: -33.8179449543086  [deg; J2000]  
        { 21h 52m 19.2s , -33d 49' 04.6" }
         +/- 2.29289696332006 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.18442844115158 [arcmin] (formal 1-sigma fit error)
    SNR: 9.29572621565351
 
  Angular difference between the analysis and refined position is 0.411452 arcmin
 
  Partial Coding Fraction: 0.4257812    [ including projection effects ]

  Duration
     T90: 3.42399999499321 +/- 0.84217814817088
        Measured from: -0.891999989748001
                   to: 2.53200000524521     [s; relative to TRIGTIME]
     T50: 1.57600003480911 +/- 0.894588156469805
        Measured from: 0.227999985218048
                   to: 1.80400002002716     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.19200000166893     
                   to: 1.19200000166893     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -1.08000001311302     
                   to: 2.75200000405312     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.097022   0.106774   0.040645   0.015413
           0.016293   0.017086   0.014801   0.013366 [error]
 Peak      0.016072   0.047566   0.024554   0.002273
           0.008272   0.008887   0.007544   0.006893 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    3.832   -1.080    2.752
T90     3.424   -0.892    2.532
T50     1.576    0.228    1.804
Peak    1.000    0.192    1.192
 
 
====== 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      -2.231    -0.416      0.365       -           -               -         3.60e-03     -1.04e-03          1.00e-03      66.420   57
CPL     -1.514    -0.571      3.530       24.722      N/A           N/A         1.02e-02        N/A               N/A         65.850   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      -1.634     -0.446     0.433       -           -               -         6.28e-03     -1.79e-03          1.77e-03      62.550   57
CPL     -0.222     -1.866     3.011       56.985      N/A           N/A         3.72e-02        N/A               N/A         60.930   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   3.52e-08  4.15e-08  3.54e-08  5.12e-08  1.30e-07  1.63e-07   erg/cm2
      90%_error_low -8.78e-09 -8.78e-09 -1.30e-08 -2.89e-08 -3.11e-08 -4.90e-08   erg/cm2
      90%_error_hi   8.98e-09  8.60e-09  1.41e-08  4.70e-08  3.26e-08  6.23e-08   erg/cm2
Peak flux       PL   2.94e-01  2.73e-01  1.76e-01  1.75e-01  8.16e-01  9.18e-01   ph/cm2/s
      90%_error_low -1.18e-01 -7.78e-02 -6.08e-02 -9.43e-02 -2.26e-01 -2.50e-01   ph/cm2/s
      90%_error_hi   1.31e-01  7.70e-02  6.07e-02  1.41e-01  2.27e-01  2.51e-01   ph/cm2/s
 
Fluence        CPL    N/A      N/A      N/A      N/A      N/A      N/A      erg/cm2
      90%_error_low -8.78e-09 -8.78e-09 -1.30e-08 -2.89e-08 -3.11e-08 -4.90e-08   erg/cm2
      90%_error_hi   8.98e-09  8.60e-09  1.41e-08  4.70e-08  3.26e-08  6.23e-08   erg/cm2
Peak flux      CPL   2.47e-01  3.21e-01  1.85e-01  4.25e-02  7.87e-01  7.95e-01   ph/cm2/s
      90%_error_low -1.31e-01 -1.01e-01 -8.68e-02 -4.25e-02 -2.27e-01 -2.33e-01   ph/cm2/s
      90%_error_hi   1.45e-01  1.13e-01  7.43e-02  1.80e-01  2.30e-01  2.81e-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
  328.0799   -33.8179   0.0206    42.6960   -28.7501         0.2867987      9.296 TRIG_00337115                 
 
Foreground time interval of the image:
 -1.080   2.752 (delta_t =   3.832 [sec])
Background time interval of the image:
-207.915  -1.080 (delta_t = 206.835 [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   -1.080 sec. to    2.752 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.23137     ( -0.416454   0.364514 )
Norm@50keV  : 3.59724E-03    ( -0.00103818   0.00100439 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          66.42 using 59 PHA bins.
# Reduced chi-squared =          1.165 for     57 degrees of freedom 
# Null hypothesis probability =   1.841192e-01
 
Photon flux (15-150 keV)    in 3.832 sec: 0.605594 ( -0.119354  0.119353 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.30231e-07 ( -3.11377e-08  3.25616e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -1.080 sec. to    2.752 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.51412     ( -0.573515   3.52719 )
Epeak [keV] : 24.7219      (   )
Norm@50keV  : 1.02023E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.85 using 59 PHA bins.
# Reduced chi-squared =          1.176 for     56 degrees of freedom 
# Null hypothesis probability =   1.726653e-01
 
Photon flux (15-150 keV)    in 3.832 sec: 0.594649 ( -0.11844  0.121724 ) 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    0.192 sec. to    1.192 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.63426     ( -0.445715   0.433065 )
Norm@50keV  : 6.27894E-03    ( -0.00179067   0.00176506 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          62.55 using 59 PHA bins.
# Reduced chi-squared =          1.097 for     57 degrees of freedom 
# Null hypothesis probability =   2.858066e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.815692 ( -0.225885  0.226838 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.85019e-08 ( -1.72285e-08  1.7606e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from    0.192 sec. to    1.192 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.221638     ( -1.86893   3.00856 )
Epeak [keV] : 56.9849      (   )
Norm@50keV  : 3.72307E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.93 using 59 PHA bins.
# Reduced chi-squared =          1.088 for     56 degrees of freedom 
# Null hypothesis probability =   3.030331e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.787131 ( -0.226806  0.229679 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.27947e-08 ( -1.75844e-08  1.92148e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 3.424 sec.
Hardness ratio (energy fluence ratio) = 0.851863494755

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

    S(15-50 keV)  = 7.666557e-08
S(50-150 keV) = 5.356788e-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 = 8.089071085815778E-01, IMY = 4.437827325362833E-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:
-207.915410 -1.080000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
170.2665 -60.7030    5.2  54.5 -153.9   1.3379   2.2    5.0	Cen X-3                       
186.7855 -62.8118   17.4  54.0 -143.9  -0.7134  -0.7    4.3	GX 301-2                      
121.6991 -46.4414    2.9  54.9  167.6   4.0356   4.0 ------	UNKNOWN                       
102.8268 -62.7381    2.3  35.6  171.3   1.1561   5.0 ------	UNKNOWN                       
349.3619 -35.8150    3.0  32.6   -5.0   0.7821   3.9 ------	UNKNOWN                       
150.0431 -55.0045    2.7  56.2 -168.5   2.7525   4.2 ------	UNKNOWN                       
329.9760 -14.7294    2.2  58.9  -15.4   5.3074   5.3 ------	UNKNOWN                       
309.1712 -67.7933    2.4  27.9  -87.9   1.0906   4.8 ------	UNKNOWN                       
314.5843 -37.8408    2.9  45.4  -45.1   1.8732   4.0 ------	UNKNOWN                       
273.9069 -64.5990    3.6  41.1  -98.1   2.7938   3.3 ------	UNKNOWN

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

    Time interval of the image:
-1.080000 2.752000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
170.0522 -60.5535   19.3  54.6 -154.0   0.0422   0.6    8.8	Cen X-3                       
186.7452 -62.6494    8.1  54.1 -144.0   0.1435   1.4    7.7	GX 301-2                      
344.7737 -24.6910    2.6  44.4   -3.9   0.1389   4.4 ------	UNKNOWN                       
328.0799 -33.8179    1.2  42.7  -28.8   0.2869   9.3 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
94.084600 963.018400
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
285.0459 -25.0428    8.6  38.2  -78.8   2.0096   1.3    7.4	HT1900.1-2455                 
 13.5442 -76.4738    3.5  47.4  176.5   2.9818   3.3 ------	UNKNOWN                       
304.5569  11.6312    2.9  50.7  -20.7   3.7619   3.9 ------	UNKNOWN                       
294.6272   6.2284    4.8  51.0  -35.2   3.8606   2.4 ------	UNKNOWN