batgrbproduct Analysis for Trigger=450884

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time (local time): Fri Apr  8 02:37:24 EDT 2011
             Host Name: gcn5
   Current Working Dir: /local/data/raid16/prebascript_archive/trigger450884/GCN5_download_cron
======================================================================

  Trigger: 00450884      Segment: 000

  BAT Trigger Time: 323878008   [s; MET]
      Trigger Stop: 323878072   [s; MET]
               UTC: 2011-04-07T14:06:41.167860    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 185.996625275413   Dec: 15.7178020980355  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    14.72
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    14.72

  Flight Position:   [ source = BAT ]
    RA: 185.996625275413   Dec: 15.7178020980355  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 186.021858879665   Dec: 15.7258826001533  [deg; J2000]  
        { 12h 24m 05.2s , +15d 43' 33.2" }
         +/- 1.47035882888295 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.578668665040928 [arcmin] (formal 1-sigma fit error)
    SNR: 17.5364705025106
 
  Angular difference between Flight and Ground position is 1.535904 arcmin
 
  Partial Coding Fraction: 0.7734375    [ including projection effects ]

  Duration
     T90: 145.487999975681 +/- 13.1313945400149
        Measured from: 2.20400011539459
                   to: 147.692000091076     [s; relative to TRIGTIME]
     T50: 64.7959999442101 +/- 10.9289459375546
        Measured from: 25.608000099659
                   to: 90.404000043869     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 27.6399999856949     
                   to: 28.6399999856949     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -2.89999997615814     
                   to: 158.811999976635     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.948471   1.309833   0.738641   0.122804
           0.070649   0.072472   0.064229   0.057136 [error]
 Peak      0.016267   0.019547   0.022795   0.011504
           0.005872   0.006215   0.005445   0.004634 [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 3.15e-07 5.04e-07 6.10e-07 1.44e-06 1.84e-06 2.87e-06   erg/cm2
              Error 3.38e-08 3.44e-08 6.25e-08 3.06e-07 1.46e-07 3.63e-07   erg/cm2
Peak flux Power-law 1.22e-01 1.61e-01 1.55e-01 2.65e-01 5.25e-01 7.02e-01   ph/cm2/s
              Error 6.78e-02 5.33e-02 4.45e-02 1.81e-01 1.40e-01 2.01e-01   ph/cm2/s
 
Fluence   Cutoff-PL 2.75e-07 5.57e-07 6.08e-07 3.70e-07 1.68e-06 1.81e-06   erg/cm2
              Error 4.07e-08 4.67e-08 7.22e-08 2.95e-07 1.69e-07 3.38e-07   erg/cm2
Peak flux Cutoff-PL 1.22e-01 1.61e-01 1.55e-01 2.63e-01 5.25e-01 7.00e-01   ph/cm2/s
              Error 6.78e-02 5.33e-02 4.45e-02 2.00e-01 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 0.00e+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    1.725    0.124    -      -           1.24e-03 9.33e-05   55.260 57
CPL   0.736    0.635      58.1   15.2      4.21e-03 4.88e-03   46.250 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    1.055    0.507    -      -           4.55e-03 1.18e-03   58.650 57
CPL   1.066    0.542    9999.4    0.0      4.58e-03 6.86e-03   58.660 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: 148.800000 sec.
T50 in the 50-300 keV band: 50.880000 sec.
 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100  161.712   -2.900  158.812
T90   145.488    2.204  147.692
T50    64.796   25.608   90.404
Peak    1.000   27.640   28.640

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
  186.0219 +15.7259 0.0109   20.0  135.4       1.9391    17.5  TRIG_00450884       
------------------------------------------
 
Foreground time interval of the image:
 -2.900  72.001 (delta_t =  74.901 [sec])
Background time interval of the image:
-239.000  -2.900 (delta_t = 236.100 [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
-2.900000 102.290000
103.000000 158.812000
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.72514     ( -0.122397   0.125009 )
Norm@50keV  : 1.23822E-03    ( -9.37412e-05   9.28609e-05 )
------------------------------------------------------------
# Chi-Squared =          55.26 using 59 PHA bins.
# Reduced chi-squared =         0.9694 for     57 degrees of freedom 
# Null hypothesis probability =   5.406941e-01
 
Photon flux (15-150 keV)    in 161 sec: 0.165921 ( -0.0113896  0.0113991 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.84237e-06 ( -1.45302e-07  1.47022e-07 ) ergs/cm2
 
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-2.900000 102.290000
103.000000 158.812000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.736446     ( -0.683521   0.586638 )
Epeak [keV] : 58.0507      ( -8.65462 21.7969 )
Norm@50keV  : 4.20862E-03    ( -0.00420868   0.0055521 )
------------------------------------------------------------
# Chi-Squared =          46.25 using 59 PHA bins.
# Reduced chi-squared =         0.8258 for     56 degrees of freedom 
# Null hypothesis probability =   8.205095e-01
 
Photon flux (15-150 keV)    in 161 sec: 0.157729 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.67585e-06 ( -1.65598e-07  1.72061e-07 ) ergs/cm2
 
Band function
Multiple GTIs in the spectrum
tstart tstop
-2.900000 102.290000
103.000000 158.812000
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.706064   ( -0.596383   1.18121 )
beta        : -2.65271    ( 2.65332   0.710135 )
Epeak [keV] : 56.8070      ( -14.7388 21.4876 )
Norm@50keV   : 4.42089E-03    ( -0.00446954   0.0187128 )
------------------------------------------------------------
# Chi-Squared =          46.04 using 59 PHA bins.
# Reduced chi-squared =         0.8371 for     55 degrees of freedom 
# Null hypothesis probability =   7.998952e-01
 
Photon flux (15-150 keV)    in 161 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   27.640 sec. to   28.640 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.05525     ( -0.534121   0.480721 )
Norm@50keV  : 4.54528E-03    ( -0.0011855   0.00117198 )
------------------------------------------------------------
# Chi-Squared =          58.65 using 59 PHA bins.
# Reduced chi-squared =          1.029 for     57 degrees of freedom 
# Null hypothesis probability =   4.146694e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.525202 ( -0.139702  0.140188 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.82213e-08 ( -1.35974e-08  1.37975e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   27.640 sec. to   28.640 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.06634     ( -0.615215   0.469333 )
Epeak [keV] : 9999.36      ( -9999.55 -9999.55 )
Norm@50keV  : 4.57507E-03    ( -0.00117029   0.0125464 )
------------------------------------------------------------
# Chi-Squared =          58.66 using 59 PHA bins.
# Reduced chi-squared =          1.048 for     56 degrees of freedom 
# Null hypothesis probability =   3.781057e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.524980 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.82283e-08 ( -1.35981e-08  1.38106e-08 ) ergs/cm2
 
Band function
Time interval is from   27.640 sec. to   28.640 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 5.00000   ( -412244   -412244 )
beta        : -1.06432    ( -0.567602   0.541871 )
Epeak [keV] : 23.0800      ( -24.8269 17.4582 )
Norm@50keV   : 512.201    ( -501.032   867062 )
------------------------------------------------------------
# Chi-Squared =          58.54 using 59 PHA bins.
# Reduced chi-squared =          1.064 for     55 degrees of freedom 
# Null hypothesis probability =   3.468542e-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  8 02:56:21 EDT 2011