batgrbproduct Analysis for Trigger=451343

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time (local time): Fri Apr 15 01:38:19 EDT 2011
             Host Name: gcn5
   Current Working Dir: /local/data/raid16/prebascript_archive/trigger451343/GCN5_download_cron
======================================================================

  Trigger: 00451343      Segment: 000

  BAT Trigger Time: 324459741.376   [s; MET]
      Trigger Stop: 324459757.76   [s; MET]
               UTC: 2011-04-14T07:42:14.521920    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 97.8758670233519   Dec: 24.3609952759365  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    10
     Image Trigger?:     NO
     Rate S/N Ratio:     13.3790881602597  [ if not an image trigger ]
     Image S/N Ratio:    10

  Flight Position:   [ source = BAT ]
    RA: 97.8758670233519   Dec: 24.3609952759365  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 97.875982056916   Dec: 24.3490359915559  [deg; J2000]  
        { 06h 31m 30.2s , +24d 20' 56.5" }
         +/- 1.61108954951304 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.686048121593822 [arcmin] (formal 1-sigma fit error)
    SNR: 15.3898051769474
 
  Angular difference between Flight and Ground position is 0.717585 arcmin
 
  Partial Coding Fraction: 0.3007812    [ including projection effects ]

  Duration
     T90: 152 +/- 73.1710325197069
        Measured from: -34.3759998679161
                   to: 117.624000132084     [s; relative to TRIGTIME]
     T50: 30 +/- 5.8309518948453
        Measured from: -7.37599986791611
                   to: 22.6240001320839     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 8.6240000128746     
                   to: 9.6240000128746     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -38.3759999871254     
                   to: 135.624000012875     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.450763   1.999314   1.440940   0.339718
           0.132936   0.139084   0.127578   0.123939 [error]
 Peak      0.035263   0.041544   0.046159   0.009215
           0.012079   0.012488   0.011438   0.010982 [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 5.82e-07 9.46e-07 1.16e-06 2.81e-06 3.49e-06 5.50e-06   erg/cm2
              Error 7.80e-08 7.62e-08 1.28e-07 6.67e-07 3.02e-07 7.67e-07   erg/cm2
Peak flux Power-law 3.72e-01 3.78e-01 2.71e-01 3.09e-01 1.14e+00 1.33e+00   ph/cm2/s
              Error 1.85e-01 1.20e-01 9.01e-02 2.10e-01 3.38e-01 3.74e-01   ph/cm2/s
 
Fluence   Cutoff-PL 5.89e-07 9.44e-07 1.16e-06 2.79e-06 3.49e-06 5.28e-06   erg/cm2
              Error 7.80e-08 5.78e-08 1.29e-07 1.08e-06 3.01e-07 1.15e-06   erg/cm2
Peak flux Cutoff-PL 3.19e-01 3.97e-01 2.93e-01 1.11e-01 1.28e+00 1.18e+00   ph/cm2/s
              Error 2.21e-01 1.35e-01 5.48e-01 0.00e+00 0.00e+00 0.00e+00   ph/cm2/s
 
Fluence        Band 0.00e+00 0.00e+00 0.00e+00 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 1.19e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+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    1.704    0.145    -      -           2.17e-03 1.79e-04   63.990 57
CPL   1.708    0.146    9999.4    0.0      2.17e-03 0.00e+00   64.000 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    1.483    0.481    -      -           9.19e-03 2.59e-03   59.490 57
CPL   0.800    2.031      96.0    0.0      1.93e-02 1.17e-01   59.060 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: 33.664000 sec.
T50 in the 50-300 keV band: 16.384000 sec.
 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100  174.000  -38.376  135.624
T90   152.000  -34.376  117.624
T50    30.000   -7.376   22.624
Peak    1.000    8.624    9.624

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
   97.8760 +24.3490 0.0124   49.3 -170.9       4.3609    15.4  TRIG_00451343       
------------------------------------------
 
Foreground time interval of the image:
-38.376 -12.026 (delta_t =  26.350 [sec])
-11.376  65.425 (delta_t =  76.801 [sec])
Background time interval of the image:
-239.376 -38.376 (delta_t = 201.000 [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
Multiple GTIs in the spectrum
tstart tstop
-38.376000 -12.026000
-11.376000 135.624000
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.70363     ( -0.143671   0.146325 )
Norm@50keV  : 2.17288E-03    ( -0.000179424   0.00017786 )
------------------------------------------------------------
# Chi-Squared =          63.99 using 59 PHA bins.
# Reduced chi-squared =          1.123 for     57 degrees of freedom 
# Null hypothesis probability =   2.445387e-01
 
Photon flux (15-150 keV)    in 173.4 sec: 0.288950 ( -0.0234268  0.0235088 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.48752e-06 ( -3.00525e-07  3.02521e-07 ) ergs/cm2
 
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-38.376000 -12.026000
-11.376000 135.624000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.70775     ( -0.148068   0.143854 )
Epeak [keV] : 9999.36      (   )
Norm@50keV  : 2.17200E-03    (     )
------------------------------------------------------------
# Chi-Squared =          64.00 using 59 PHA bins.
# Reduced chi-squared =          1.143 for     56 degrees of freedom 
# Null hypothesis probability =   2.163288e-01
 
Photon flux (15-150 keV)    in 173.4 sec: 0.288845 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.48733e-06 ( -2.99184e-07  3.03155e-07 ) ergs/cm2
 
Band function
Multiple GTIs in the spectrum
tstart tstop
-38.376000 -12.026000
-11.376000 135.624000
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.26243   ( 1.26131   1.26131 )
beta        : -1.71781    ( 1.71889   0.157233 )
Epeak [keV] : 43.6134      ( -44.2167 -44.2167 )
Norm@50keV   : 4.55240E-03    ( -0.00256651   0 )
------------------------------------------------------------
# Chi-Squared =          63.93 using 59 PHA bins.
# Reduced chi-squared =          1.162 for     55 degrees of freedom 
# Null hypothesis probability =   1.915887e-01
 
Photon flux (15-150 keV)    in 173.4 sec:  (    ) 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    8.624 sec. to    9.624 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.48339     ( -0.479534   0.483251 )
Norm@50keV  : 9.18992E-03    ( -0.00259517   0.00258942 )
------------------------------------------------------------
# Chi-Squared =          59.49 using 59 PHA bins.
# Reduced chi-squared =          1.044 for     57 degrees of freedom 
# Null hypothesis probability =   3.851069e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.14222 ( -0.336451  0.339664 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.74221e-08 ( -2.60247e-08  2.63187e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from    8.624 sec. to    9.624 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.800247     ( -2.53683   1.52515 )
Epeak [keV] : 95.9846      ( -95.9999 -95.9999 )
Norm@50keV  : 1.92654E-02    ( -0.0192614   0.21454 )
------------------------------------------------------------
# Chi-Squared =          59.06 using 59 PHA bins.
# Reduced chi-squared =          1.055 for     56 degrees of freedom 
# Null hypothesis probability =   3.644675e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.27688 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.86726e-08 ( -2.66038e-08  2.76574e-08 ) ergs/cm2
 
Band function
Time interval is from    8.624 sec. to    9.624 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.881551   ( 0.881546   2.61868 )
beta        : -9.37153    ( 9.99974   19.9997 )
Epeak [keV] : 102.867      ( -53.7984 -102.854 )
Norm@50keV   : 1.75372E-02    ( -0.010342   0.0491631 )
------------------------------------------------------------
# Chi-Squared =          59.06 using 59 PHA bins.
# Reduced chi-squared =          1.074 for     55 degrees of freedom 
# Null hypothesis probability =   3.294041e-01
 
Photon flux (15-150 keV)    in 1 sec:  (    ) 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     
Plot creation:
Fri Apr 15 02:06:26 EDT 2011