batgrbproduct Analysis for Trigger=349931

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.45
    Process Start Time (local time): Tue Aug 11 01:06:06 EDT 2009
             Host Name: gcn14
   Current Working Dir: /net/raid16/BAT_GRB_process_2009/349931
======================================================================

  Trigger: 00349931      Segment: 000

  BAT Trigger Time: 262064121.444   [s; MET]
      Trigger Stop: 262064121.508   [s; MET]
               UTC: 2009-04-22T03:35:16.764880    [includes UTCF correction] 
       Where From?: (*SHORT BURST*) TDRSS scaled map message

  BAT 
    RA: 294.756100929833   Dec: 40.3842290518036  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7
     Image Trigger?:     NO
     Rate S/N Ratio:     10.3923048454133  [ if not an image trigger ]
     Image S/N Ratio:    7

  Flight Position:   [ source = BAT ]
    RA: 294.756100929833   Dec: 40.3842290518036  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 294.743911061338   Dec: 40.3965440392835  [deg; J2000]  
        { 19h 38m 58.5s , +40d 23' 47.6" }
         +/- 1.88148856051605 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.812026030005012 [arcmin] (formal 1-sigma fit error)
    SNR: 12.3302891939684
 
  Angular difference between Flight and Ground position is 0.925360 arcmin
 
  Partial Coding Fraction: 0.71875    [ including projection effects ]

  Duration
     T90: 8.47200000286102 +/- 0.381764329779977
        Measured from: -0.263999998569489
                   to: 8.20800000429153     [s; relative to TRIGTIME]
     T50: 7.47600001096725 +/- 5.53747958421237
        Measured from: 0.0839999914169312
                   to: 7.56000000238419     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.372000008821487     
                   to: 0.627999991178513     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.392000019550323     
                   to: 8.49599999189377     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.143956   0.127819   0.103164   0.044286
           0.019264   0.019752   0.017516   0.015413 [error]
 Peak      0.055026   0.073015   0.070125   0.017513
           0.007169   0.007515   0.007033   0.005472 [error]

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

======================================================================
 
=== 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   Power-law 3.86e-08 6.36e-08 7.95e-08 1.97e-07 2.37e-07 3.79e-07   erg/cm2
              Error 8.99e-09 8.89e-09 1.82e-08 9.80e-08 4.13e-08 1.13e-07   erg/cm2
Peak flux Power-law 4.85e-01 5.51e-01 4.48e-01 6.10e-01 1.71e+00 2.09e+00   ph/cm2/s
              Error 8.55e-02 6.05e-02 5.47e-02 1.52e-01 1.73e-01 2.22e-01   ph/cm2/s
 
Fluence   Cutoff-PL 3.87e-08 6.37e-08 7.94e-08 1.95e-07 2.37e-07 3.78e-07   erg/cm2
              Error 8.99e-09 8.87e-09 1.82e-08 8.78e-08 4.11e-08 1.19e-07   erg/cm2
Peak flux Cutoff-PL 4.59e-01 5.72e-01 4.62e-01 4.03e-01 1.69e+00 1.90e+00   ph/cm2/s
              Error 9.87e-02 7.34e-02 6.18e-02 2.76e-01 1.77e-01 4.01e-01   ph/cm2/s
 
Fluence        Band 3.58e-08 6.32e-08 8.12e-08 1.97e-07 2.37e-07 4.21e-07   erg/cm2
              Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00   erg/cm2
Peak flux      Band 4.50e-01 5.92e-01 4.47e-01 5.34e-01 1.69e+00 2.02e+00   ph/cm2/s
              Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00   ph/cm2/s
 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.679    0.289    -      -           2.88e-03 4.64e-04   51.680 57
CPL   2.611    0.000     200.6    0.0      9.99e-04 0.00e+00   48.240 56
 
The chi2 of BB fit is  which shows a significant improvement in the fit over a PL.
Check the BB fit.
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.297    0.168    -      -           1.43e-02 1.44e-03   59.110 57
CPL   0.956    0.588     153.1    0.0      2.14e-02 0.00e+00   58.320 56
 
Model      : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index   : photon index: E^-{Ph_index} (minus sign is not included in the 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 PL model and at 1 keV in CPL model
Nomr_90err : 90% error of the normalization
chi2       : Chi-Squared
dof        : degree of freedom
 
=== T90/T50 calculation in the 50-300 keV band (BATSE band) using 64 ms lc ===
 
T90 in the 50-300 keV band: 0.704000 sec.
T50 in the 50-300 keV band: 0.256000 sec.
 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100    8.888   -0.392    8.496
T90     8.472   -0.264    8.208
T50     7.476    0.084    7.560
Peak    1.000   -0.372    0.628

Image

Pre-slew 15-350 keV image (Event data; bkg subtracted)

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
  294.7439 +40.3965 0.0157   21.4  -79.7       0.4333    12.3  TRIG_00349931       
------------------------------------------
 
Foreground time interval of the image:
 -0.392   8.496 (delta_t =   8.888 [sec])
Background time interval of the image:
-239.444  -0.392 (delta_t = 239.052 [sec])

Lightcurves

Notes:

1 s binning

From T0-310 s to T0+310 s
From T100_start - 20 s to T100_end + 30 s
Full time interval

64 ms binning

Full time interval
From T100_start to T100_end
From T0-5 sec to T0+5 sec

16 ms binning

From T100_start-5 s to T100_start+5 s

8 ms binning

From T100_start-3 s to T100_start+3 s

2 ms binning

From T100_start-1 s to T100_start+1 s

SN=5 or 10 sec. binning (whichever binning is satisfied first)

SN=5 or 10 sec. binning (T < 200 sec)

Spectra

Notes:

Time averaged spectrum fit using the pre-slew DRM

Power-law model
Time interval is from   -0.392 sec. to    8.496 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.67905     ( -0.282721   0.294626 )
Norm@50keV  : 2.87645E-03    ( -0.00047416   0.000453749 )
------------------------------------------------------------
# Chi-Squared =          51.68 using 59 PHA bins.
# Reduced chi-squared =         0.9067 for     57 degrees of freedom 
# Null hypothesis probability =   6.742092e-01
 
Photon flux (15-150 keV)    in 8.888 sec: 0.379272 ( -0.0530381  0.0530616 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.3712e-07 ( -4.08598e-08  4.18331e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   -0.392 sec. to    8.496 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.61128     (     )
Epeak [keV] : 200.632      (   )
Norm@50keV  : 9.99429E-04    (     )
------------------------------------------------------------
# Chi-Squared =          48.24 using 59 PHA bins.
# Reduced chi-squared =         0.8614 for     56 degrees of freedom 
# Null hypothesis probability =   7.600888e-01
 
Photon flux (15-150 keV)    in 8.888 sec: 0.379231 ( -0.052759  0.052724 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.36912e-07 ( -4.06048e-08  4.16829e-08 ) ergs/cm2
 
Band function
Time interval is from   -0.392 sec. to    8.496 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.39001   ( 1.39001   1.39001 )
beta        : -1.67898    ( 1.67902   0.282731 )
Epeak [keV] : 15.0732      ( -15.085 -15.085 )
Norm@50keV   : 6.73921E-03    ( -0.00673886   0.0757305 )
------------------------------------------------------------
# Chi-Squared =          51.68 using 59 PHA bins.
# Reduced chi-squared =         0.9397 for     55 degrees of freedom 
# Null hypothesis probability =   6.022200e-01
 
Photon flux (15-150 keV)    in 8.888 sec: 0.379046 ( -0.052904  0.052652 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.36909e-07 ( -3.38117e-08  3.59902e-08 ) ergs/cm2
 
Single BB
 
 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    :   (  )
R^2/D10^2   :   (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25     
25- 50     
50-150     
15-150     
Thermal bremsstrahlung (OTTB)
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    :        (      )
Norm        :        (     )
------------------------------------------------------------
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25     
25- 50     
50-150     
15-150     
Double BB
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   :         (      )
R1^2/D10^2  :         (      )
kT2 [keV]   :         (      )
R2^2/D10^2  :     (   )
------------------------------------------------------------
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25     
25- 50     
50-150     
15-150     

Peak spectrum fit

Power-law model
Time interval is from   -0.372 sec. to    0.628 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.29665     ( -0.168622   0.167745 )
Norm@50keV  : 1.43150E-02    ( -0.00144708   0.00144174 )
------------------------------------------------------------
# Chi-Squared =          59.11 using 59 PHA bins.
# Reduced chi-squared =          1.037 for     57 degrees of freedom 
# Null hypothesis probability =   3.982661e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.70677 ( -0.17259  0.1727 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.41574e-07 ( -1.60608e-08  1.62101e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   -0.372 sec. to    0.628 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.956034     ( -0.747892   0.42742 )
Epeak [keV] : 153.119      ( -153.173 -153.173 )
Norm@50keV  : 2.13992E-02    (     )
------------------------------------------------------------
# Chi-Squared =          58.32 using 59 PHA bins.
# Reduced chi-squared =          1.041 for     56 degrees of freedom 
# Null hypothesis probability =   3.901628e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.68804 ( -0.17682  0.17638 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.37885e-07 ( -1.7968e-08  1.7725e-08 ) ergs/cm2
 
Band function
Time interval is from   -0.372 sec. to    0.628 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 4.99813   ( -1035.57   -1020.59 )
beta        : -1.43931    ( -0.237156   0.210611 )
Epeak [keV] : 27.2207      ( -6.03402 5.31065 )
Norm@50keV   : 795.735    ( -796.043   2752.43 )
------------------------------------------------------------
# Chi-Squared =          54.86 using 59 PHA bins.
# Reduced chi-squared =         0.9975 for     55 degrees of freedom 
# Null hypothesis probability =   4.798171e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.69423 ( -0.17607  0.17642 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.3776e-07 ( -1.7947e-08  1.7731e-08 ) ergs/cm2
 
Single BB
 
 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    :   (  )
R^2/D10^2   :   (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25     
25- 50     
50-150     
15-150     
Thermal bremsstrahlung (OTTB)
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    :        (      )
Norm        :        (     )
------------------------------------------------------------
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25     
25- 50     
50-150     
15-150     
Double BB
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   :         (      )
R1^2/D10^2  :         (      )
kT2 [keV]   :         (      )
R2^2/D10^2  :     (   )
------------------------------------------------------------
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25     
25- 50     
50-150     
15-150     
Plot creation:
Fri May 27 11:53:06 EDT 2011