batgrbproduct Analysis for Trigger=345945

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.45
    Process Start Time (local time): Fri Aug 21 12:27:17 EDT 2009
             Host Name: gcn14
   Current Working Dir: /net/raid16/BAT_GRB_process_2009/345945
======================================================================

  Trigger: 00345945      Segment: 000

  BAT Trigger Time: 258334157.824   [s; MET]
      Trigger Stop: 258334158.848   [s; MET]
               UTC: 2009-03-09T23:29:13.262340    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 284.980772926882   Dec: -25.2643001528138  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.07
     Image Trigger?:     NO
     Rate S/N Ratio:     11.5758369027902  [ if not an image trigger ]
     Image S/N Ratio:    7.07

  Flight Position:   [ source = BAT ]
    RA: 284.980772926882   Dec: -25.2643001528138  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 284.98357665424   Dec: -25.2781865604214  [deg; J2000]  
        { 18h 59m 56.1s , -25d 16' 41.5" }
         +/- 2.27530198803213 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.861422836543698 [arcmin] (formal 1-sigma fit error)
    SNR: 9.3985877286152
 
  Angular difference between Flight and Ground position is 0.846958 arcmin
 
  Partial Coding Fraction: 0.625    [ including projection effects ]

  Duration
     T90: 3 +/- 1.4142135623731
        Measured from: -0.824000000953674
                   to: 2.17599999904633     [s; relative to TRIGTIME]
     T50: 1 +/- 1
        Measured from: 0.175999999046326
                   to: 1.17599999904633     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.175999999046326     
                   to: 1.17599999904633     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.824000000953674     
                   to: 2.17599999904633     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.044253   0.080126   0.062000   0.035096
           0.013450   0.012652   0.011023   0.010155 [error]
 Peak      0.018213   0.047891   0.029740   0.018183
           0.007993   0.007700   0.006589   0.005953 [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 1.51e-08 3.13e-08 5.08e-08 1.85e-07 1.40e-07 2.82e-07   erg/cm2
              Error 5.18e-09 6.21e-09 1.08e-08 9.40e-08 2.68e-08 9.99e-08   erg/cm2
Peak flux Power-law 3.16e-01 3.15e-01 2.20e-01 2.42e-01 9.47e-01 1.09e+00   ph/cm2/s
              Error 1.03e-01 6.33e-02 5.39e-02 1.24e-01 1.82e-01 2.09e-01   ph/cm2/s
 
Fluence   Cutoff-PL 1.51e-08 3.13e-08 5.08e-08 1.84e-07 1.40e-07 2.66e-07   erg/cm2
              Error 5.23e-09 6.26e-09 1.09e-08 9.21e-08 2.68e-08 0.00e+00   erg/cm2
Peak flux Cutoff-PL 2.98e-01 3.25e-01 2.25e-01 1.59e-01 9.31e-01 1.00e+00   ph/cm2/s
              Error 1.35e-01 8.18e-02 6.04e-02 1.90e-01 1.99e-01 2.86e-01   ph/cm2/s
 
Fluence        Band 1.51e-08 3.13e-08 2.75e-07 0.00e+00 0.00e+00 0.00e+00   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 2.83e-01 3.36e-01 2.25e-01 1.73e-01 9.18e-01 1.02e+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    1.300    0.332    -      -           4.74e-03 8.12e-04   40.960 57
CPL   2.444    0.000     146.9    0.0      1.09e-03 0.00e+00   39.960 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    1.519    0.340    -      -           7.54e-03 1.47e-03   75.590 57
CPL   1.150    1.766     112.4    0.0      1.17e-02 1.54e-01   75.490 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: 0.960000 sec.
T50 in the 50-300 keV band: 0.512000 sec.
 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100    3.000   -0.824    2.176
T90     3.000   -0.824    2.176
T50     1.000    0.176    1.176
Peak    1.000    0.176    1.176

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
  284.9836 -25.2782 0.0205   24.7  -93.0       0.2309     9.4  TRIG_00345945       
------------------------------------------
 
Foreground time interval of the image:
 -0.824   2.176 (delta_t =   3.000 [sec])
Background time interval of the image:
-530.623 -493.713 (delta_t =  36.910 [sec])
-239.824  -0.824 (delta_t = 239.000 [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   -0.824 sec. to    2.176 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.30047     ( -0.337112   0.327069 )
Norm@50keV  : 4.73859E-03    ( -0.000812055   0.000811585 )
------------------------------------------------------------
# Chi-Squared =          40.96 using 59 PHA bins.
# Reduced chi-squared =         0.7186 for     57 degrees of freedom 
# Null hypothesis probability =   9.460670e-01
 
Photon flux (15-150 keV)    in 3 sec: 0.565370 ( -0.101421  0.102169 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.40463e-07 ( -2.65986e-08  2.69885e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   -0.824 sec. to    2.176 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.44356     (     )
Epeak [keV] : 146.923      (   )
Norm@50keV  : 1.09231E-03    (     )
------------------------------------------------------------
# Chi-Squared =          39.96 using 59 PHA bins.
# Reduced chi-squared =         0.7135 for     56 degrees of freedom 
# Null hypothesis probability =   9.480817e-01
 
Photon flux (15-150 keV)    in 3 sec: 0.565143 ( -0.101354  0.101757 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.40481e-07 ( -2.67054e-08  2.69463e-08 ) ergs/cm2
 
Band function
Time interval is from   -0.824 sec. to    2.176 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.10958   ( 1.10962   6.07789 )
beta        : -1.30040    ( 1.30043   0.3371 )
Epeak [keV] : 42.9479      ( -42.9195 -42.9195 )
Norm@50keV   : 7.92095E-03    ( -0.00399451   1.12441 )
------------------------------------------------------------
# Chi-Squared =          40.96 using 59 PHA bins.
# Reduced chi-squared =         0.7448 for     55 degrees of freedom 
# Null hypothesis probability =   9.204399e-01
 
Photon flux (15-150 keV)    in 3 sec: 0.564193 ( -0.097536  0.096603 ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) 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    0.176 sec. to    1.176 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.51902     ( -0.337808   0.342502 )
Norm@50keV  : 7.54280E-03    ( -0.00147566   0.00145609 )
------------------------------------------------------------
# Chi-Squared =          75.59 using 59 PHA bins.
# Reduced chi-squared =          1.326 for     57 degrees of freedom 
# Null hypothesis probability =   5.025745e-02
 
Photon flux (15-150 keV)    in 1 sec: 0.946539 ( -0.181439  0.182089 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.13377e-08 ( -1.50616e-08  1.5353e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from    0.176 sec. to    1.176 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.14952     ( -2.83799   0.694976 )
Epeak [keV] : 112.357      ( -114.538 -114.538 )
Norm@50keV  : 1.16904E-02    ( -0.00664031   0.302223 )
------------------------------------------------------------
# Chi-Squared =          75.49 using 59 PHA bins.
# Reduced chi-squared =          1.348 for     56 degrees of freedom 
# Null hypothesis probability =   4.232994e-02
 
Photon flux (15-150 keV)    in 1 sec: 0.930968 ( -0.211942  0.186322 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.92185e-08 ( -1.92245e-08  1.71856e-08 ) ergs/cm2
 
Band function
Time interval is from    0.176 sec. to    1.176 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.526143   ( 0.872537   0.872537 )
beta        : -2.01762    ( 1.83645   0.626483 )
Epeak [keV] : 68.6078      ( -70.4362 182.559 )
Norm@50keV   : 2.51073E-02    ( -0.0131569   2267.82 )
------------------------------------------------------------
# Chi-Squared =          75.13 using 59 PHA bins.
# Reduced chi-squared =          1.366 for     55 degrees of freedom 
# Null hypothesis probability =   3.697534e-02
 
Photon flux (15-150 keV)    in 1 sec: 0.918496 ( -0.204238  0.193574 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.85424e-08 ( -1.59452e-08  1.66167e-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 12:10:16 EDT 2011