Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Sun Jan 19 22:13:35 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger330856
======================================================================

  Trigger: 00330856      Segment: 000

  BAT Trigger Time: 245049835.904   [s; MET]
      Trigger Stop: 245049836.928   [s; MET]
               UTC: 2008-10-07T05:23:52.748620    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 339.976068527769   Dec: -40.1359411791978  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    9.43
     Image Trigger?:     NO
     Rate S/N Ratio:     14.7309198626562  [ if not an image trigger ]
     Image S/N Ratio:    9.43

  Analysis Position:   [ source = BAT ]
    RA: 339.976068527769   Dec: -40.1359411791978  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 339.961059990733   Dec: -40.1464302164674  [deg; J2000]  
        { 22h 39m 50.7s , -40d 08' 47.1" }
         +/- 1.49604539789256 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.624444862624335 [arcmin] (formal 1-sigma fit error)
    SNR: 17.1079225864739
 
  Angular difference between the analysis and refined position is 0.932723 arcmin
 
  Partial Coding Fraction: 0.2890625    [ including projection effects ]

  Duration
     T90: 9.72799998521805 +/- 4.87409476255166
        Measured from: -4
                   to: 5.72799998521805     [s; relative to TRIGTIME]
     T50: 2.87999999523163 +/- 0.724077357253429
        Measured from: 0.671999990940094
                   to: 3.55199998617172     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.651999980211258     
                   to: 1.65199998021126     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -8.67200002074242     
                   to: 6.81599998474121     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.501372   0.600226   0.202319   0.036113
           0.041336   0.042711   0.038091   0.036664 [error]
 Peak      0.101936   0.110895   0.057007   0.016328
           0.011515   0.012305   0.010448   0.009477 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   15.488   -8.672    6.816
T90     9.728   -4.000    5.728
T50     2.880    0.672    3.552
Peak    1.000    0.652    1.652
 
 
====== 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      -2.426    -0.201      0.188       -           -               -         5.00e-03     -6.91e-04          6.80e-04      40.960   57
CPL     -1.520    -0.661      1.102       20.123      N/A           N/A         1.77e-02        N/A               N/A         37.360   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      -2.204     -0.265     0.241       -           -               -         1.73e-02     -2.94e-03          2.82e-03      66.670   57
CPL     -1.989      N/A       N/A           2.467      N/A           N/A         2.26e-02        N/A               N/A         66.870   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   2.38e-07  2.50e-07  1.86e-07  2.24e-07  7.61e-07  8.99e-07   erg/cm2
      90%_error_low -2.92e-08 -2.44e-08 -3.45e-08 -7.10e-08 -8.07e-08 -1.21e-07   erg/cm2
      90%_error_hi   2.98e-08  2.42e-08  3.59e-08  9.06e-08  8.24e-08  1.34e-07   erg/cm2
Peak flux       PL   1.41e+00  9.38e-01  4.07e-01  2.43e-01  2.87e+00  3.00e+00   ph/cm2/s
      90%_error_low -2.51e-01 -1.17e-01 -9.02e-02 -9.01e-02 -3.60e-01 -3.70e-01   ph/cm2/s
      90%_error_hi   2.61e-01  1.16e-01  9.09e-02  1.16e-01  3.61e-01  3.70e-01   ph/cm2/s
 
Fluence        CPL    N/A      N/A      N/A      N/A      N/A      N/A      erg/cm2
      90%_error_low -2.92e-08 -2.44e-08 -3.45e-08 -7.10e-08 -8.07e-08 -1.21e-07   erg/cm2
      90%_error_hi   2.98e-08  2.42e-08  3.59e-08  9.06e-08  8.24e-08  1.34e-07   erg/cm2
Peak flux      CPL   1.41e+00  9.33e-01  4.07e-01  2.63e-01  2.88e+00  3.01e+00   ph/cm2/s
      90%_error_low -2.66e-01     N/A   -8.97e-02 -1.09e-01 -3.63e-01 -3.85e-01   ph/cm2/s
      90%_error_hi   2.68e-01     N/A    9.12e-02  6.57e-02  3.63e-01  3.86e-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
  339.9611   -40.1464   0.0113    49.2996  -164.5106         1.4683001     17.108 TRIG_00330856                 
 
Foreground time interval of the image:
 -8.672   6.816 (delta_t =  15.488 [sec])
Background time interval of the image:
-204.403 -198.624 (delta_t =   5.779 [sec])
-197.904  -8.672 (delta_t = 189.232 [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   -8.672 sec. to    6.816 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.42622     ( -0.201096   0.187765 )
Norm@50keV  : 5.00489E-03    ( -0.000690974   0.000679807 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          40.96 using 59 PHA bins.
# Reduced chi-squared =         0.7186 for     57 degrees of freedom 
# Null hypothesis probability =   9.460893e-01
 
Photon flux (15-150 keV)    in 15.49 sec: 0.940561 ( -0.087041  0.087109 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.61047e-07 ( -8.07141e-08  8.23877e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -8.672 sec. to    6.816 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.52043     ( -0.661644   1.10123 )
Epeak [keV] : 20.1229      (   )
Norm@50keV  : 1.77485E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          37.36 using 59 PHA bins.
# Reduced chi-squared =         0.6672 for     56 degrees of freedom 
# Null hypothesis probability =   9.738823e-01
 
Photon flux (15-150 keV)    in 15.49 sec: 0.940592 ( -0.087046  0.086478 ) 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    0.652 sec. to    1.652 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.20364     ( -0.265146   0.241434 )
Norm@50keV  : 1.73202E-02    ( -0.00293752   0.00281943 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          66.67 using 59 PHA bins.
# Reduced chi-squared =          1.170 for     57 degrees of freedom 
# Null hypothesis probability =   1.786188e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.87320 ( -0.36033  0.36087 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.62963e-07 ( -2.33487e-08  2.37179e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from    0.652 sec. to    1.652 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.98867     (       )
Epeak [keV] : 2.46665      (   )
Norm@50keV  : 2.25585E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          66.87 using 59 PHA bins.
# Reduced chi-squared =          1.194 for     56 degrees of freedom 
# Null hypothesis probability =   1.515639e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.87746 ( -0.3632  0.36341 ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 9.728 sec.
Hardness ratio (energy fluence ratio) = 0.744252119679

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

    S(15-50 keV)  = 4.886049e-07
S(50-150 keV) = 2.7244289e-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 = -1.120363818542023E+00, IMY = 3.104811782056601E-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:
-204.403400 -198.624100
-197.904000 -8.672000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.5884  35.1993    1.1  49.6  -41.1   6.9985  10.7    0.2	Cyg X-1                       
308.2395  41.0346    4.0  46.2  -29.9   0.9518   2.9    7.6	Cyg X-3                       
326.0271  38.2538    4.5  34.3  -18.4   0.4569   2.6    7.9	Cyg X-2                       
 25.3825  -0.0702    2.0  40.4  110.3   3.2867   5.7 ------	UNKNOWN                       
  2.7588  39.6345    2.4  34.3   33.2   0.9805   4.9 ------	UNKNOWN

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

    Time interval of the image:
-8.672000 6.816000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.5741  35.2181    7.0  49.6  -41.1  -0.2487  -1.6    1.3	Cyg X-1                       
308.2714  40.9547    5.3  46.1  -30.0  -0.1829  -2.2    7.3	Cyg X-3                       
326.0207  38.2735    4.8  34.4  -18.4  -0.1136  -2.4    7.7	Cyg X-2                       
 21.5633 -22.6317    2.2  47.1  142.2   0.8246   5.3 ------	UNKNOWN                       
 11.8276  -8.1490    2.8  31.0  132.1   0.2286   4.0 ------	UNKNOWN                       
339.9611 -40.1464    0.7  49.3 -164.5   1.4683  17.1 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
87.596590 962.124100
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
284.9661 -25.0707   12.0  47.9  -40.7   1.6641   1.0    9.8	HT1900.1-2455                 
 52.8020 -77.2770    3.3  47.3 -148.1   3.4553   3.5 ------	UNKNOWN