batgrbproduct Analysis for Trigger=518731

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time (local time): Tue Mar 27 11:27:48 EDT 2012
             Host Name: gcn5
   Current Working Dir: /local/data/raid16/prebascript_archive/trigger518731/GCN5_download_cron
======================================================================

  Trigger: 00518731      Segment: 000

  BAT Trigger Time: 354509724.672   [s; MET]
      Trigger Stop: 354509726.72   [s; MET]
               UTC: 2012-03-27T02:55:16.636400    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 246.828429216695   Dec: -29.4152103588065  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.58
     Image Trigger?:     NO
     Rate S/N Ratio:     8.54400374531753  [ if not an image trigger ]
     Image S/N Ratio:    8.58

  Flight Position:   [ source = BAT ]
    RA: 246.828429216695   Dec: -29.4152103588065  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 246.854108872735   Dec: -29.4153675211979  [deg; J2000]  
        { 16h 27m 25.0s , -29d 24' 55.3" }
         +/- 1.13818626542528 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.311850856120789 [arcmin] (formal 1-sigma fit error)
    SNR: 25.282126944567
 
  Angular difference between Flight and Ground position is 1.342180 arcmin
 
  Partial Coding Fraction: 0.765625    [ including projection effects ]

  Duration
     T90: 62.8839999437332 +/- 7.52171254966162
        Measured from: -6.99199986457825
                   to: 55.892000079155     [s; relative to TRIGTIME]
     T50: 23.2359999418259 +/- 3.6503720058772
        Measured from: 16.5640001296997
                   to: 39.8000000715256     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 37.0879999995232     
                   to: 38.0879999995232     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -15.7879999876022     
                   to: 74.5760000348091     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.625868   2.193829   1.657619   0.390345
           0.065209   0.058686   0.049827   0.040466 [error]
 Peak      0.112399   0.168922   0.172861   0.042562
           0.008118   0.008449   0.007896   0.005449 [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 4.96e-07 9.01e-07 1.26e-06 3.66e-06 3.61e-06 6.32e-06   erg/cm2
              Error 3.14e-08 3.27e-08 5.09e-08 3.40e-07 1.23e-07 3.68e-07   erg/cm2
Peak flux Power-law 1.03e+00 1.24e+00 1.07e+00 1.58e+00 3.90e+00 4.92e+00   ph/cm2/s
              Error 1.06e-01 7.61e-02 6.24e-02 2.01e-01 2.07e-01 2.62e-01   ph/cm2/s
 
Fluence   Cutoff-PL 4.78e-07 9.11e-07 1.27e-06 2.89e-06 5.55e-06 0.00e+00   erg/cm2
              Error 3.90e-08 3.57e-08 5.53e-08 8.79e-07 8.86e-07 0.00e+00   erg/cm2
Peak flux Cutoff-PL 1.02e+00 1.24e+00 1.08e+00 1.48e+00 3.89e+00 4.81e+00   ph/cm2/s
              Error 1.28e-01 7.96e-02 7.26e-02 3.69e-01 2.15e-01 4.29e-01   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    1.520    0.061    -      -           4.22e-03 1.35e-04   53.050 57
CPL   1.352    0.219     206.0    0.0      5.06e-03 0.00e+00   51.470 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.208    0.092    -      -           3.32e-02 1.68e-03   53.120 57
CPL   1.101    0.238     444.2    0.0      3.70e-02 0.00e+00   53.050 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: 49.152000 sec.
T50 in the 50-300 keV band: 27.200000 sec.
 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   90.364  -15.788   74.576
T90    62.884   -6.992   55.892
T50    23.236   16.564   39.800
Peak    1.000   37.088   38.088

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
  246.8541 -29.4154 0.0076   17.1   76.2       2.0621    25.3  TRIG_00518731       
------------------------------------------
 
Foreground time interval of the image:
-15.788  23.929 (delta_t =  39.717 [sec])
Background time interval of the image:
-239.672 -15.788 (delta_t = 223.884 [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  -15.788 sec. to   74.576 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.51960     ( -0.0611986   0.0612063 )
Norm@50keV  : 4.22245E-03    ( -0.000135069   0.00013502 )
------------------------------------------------------------
# Chi-Squared =          53.05 using 59 PHA bins.
# Reduced chi-squared =         0.9307 for     57 degrees of freedom 
# Null hypothesis probability =   6.239041e-01
 
Photon flux (15-150 keV)    in 90.36 sec: 0.529953 ( -0.018489  0.0185493 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.60818e-06 ( -1.22888e-07  1.23168e-07 ) ergs/cm2
 
Cutoff power-law model
Time interval is from  -15.788 sec. to   74.576 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.35156     ( -0.239527   0.19772 )
Epeak [keV] : 205.969      (   )
Norm@50keV  : 5.06434E-03    (     )
------------------------------------------------------------
# Chi-Squared =          51.47 using 59 PHA bins.
# Reduced chi-squared =         0.9191 for     56 degrees of freedom 
# Null hypothesis probability =   6.467880e-01
 
Photon flux (15-150 keV)    in 90.36 sec: 0.523377 ( -0.020343  0.020404 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.54699e-06 ( -7.83493e-07  9.88421e-07 ) ergs/cm2
 
Band function
Time interval is from  -15.788 sec. to   74.576 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 1.60938   ( -2.30075   -2.17966 )
beta        : -1.56782    ( -0.0780266   0.0738666 )
Epeak [keV] : 29.7426      ( -6.24113 74.5416 )
Norm@50keV   : 0.800333    ( -0.798907   156.531 )
------------------------------------------------------------
# Chi-Squared =          48.63 using 59 PHA bins.
# Reduced chi-squared =         0.8842 for     55 degrees of freedom 
# Null hypothesis probability =   7.151185e-01
 
Photon flux (15-150 keV)    in 90.36 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]    : 16.2592  (  )
R^2/D10^2   : 4.31360E-02  (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared =         263.40 using 59 PHA bins.
# Reduced chi-squared =         4.6210 for     57 degrees of freedom 
# Null hypothesis probability =   2.721548e-28
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.123e-07   1.473e-08
25- 50  9.055e-07   4.075e-08
50-150  1.683e-06   1.030e-07
15-150  2.801e-06   1.071e-07
Thermal bremsstrahlung (OTTB)
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 199.990       (      )
Norm        : 2.16035       (-2.16035     -2.16035)
------------------------------------------------------------
# Chi-Squared =          54.92 using 59 PHA bins.
# Reduced chi-squared =         0.9635 for     57 degrees of freedom 
# Null hypothesis probability =   5.534332e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.862e-07   2.465e-07
25- 50  9.353e-07   4.776e-07
50-150  2.051e-06   1.045e-06
15-150  3.473e-06   1.767e-06
Double BB
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 7.14338        (-0.766731      0.841514)
R1^2/D10^2  : 0.511064        (-0.163165      0.258688)
kT2 [keV]   : 27.6793        (-2.8345      3.80255)
R2^2/D10^2  : 5.52973E-03    (-0.00200447   0.00264266)
------------------------------------------------------------
# Chi-Squared =          48.98 using 59 PHA bins.
# Reduced chi-squared =         0.8906 for     55 degrees of freedom 
# Null hypothesis probability =   7.025342e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.493e-07   5.227e-08
25- 50  9.247e-07   6.276e-08
50-150  2.180e-06   2.001e-07
15-150  3.554e-06   2.783e-07

Peak spectrum fit

Power-law model
Time interval is from   37.088 sec. to   38.088 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.20840     ( -0.0920075   0.0916756 )
Norm@50keV  : 3.31750E-02    ( -0.00168331   0.00168298 )
------------------------------------------------------------
# Chi-Squared =          53.12 using 59 PHA bins.
# Reduced chi-squared =         0.9319 for     57 degrees of freedom 
# Null hypothesis probability =   6.214145e-01
 
Photon flux (15-150 keV)    in 1 sec: 3.89872 ( -0.206433  0.206942 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.35781e-07 ( -1.87088e-08  1.87887e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   37.088 sec. to   38.088 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.10142     ( -0.361914   0.113294 )
Epeak [keV] : 444.243      (   )
Norm@50keV  : 3.70457E-02    (     )
------------------------------------------------------------
# Chi-Squared =          53.05 using 59 PHA bins.
# Reduced chi-squared =         0.9473 for     56 degrees of freedom 
# Null hypothesis probability =   5.873389e-01
 
Photon flux (15-150 keV)    in 1 sec: 3.88569 ( -0.2154  0.21424 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.76554e-07 ( -1.6184e-07  1.10924e-07 ) ergs/cm2
 
Band function
Time interval is from   37.088 sec. to   38.088 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.14286   ( 0.838955   5.83181 )
beta        : -1.54004    ( 6.82236   16.2362 )
Epeak [keV] : 744.606      ( -436.273 -744.916 )
Norm@50keV   : 3.55090E-02    ( -0.00355793   0.0101117 )
------------------------------------------------------------
# Chi-Squared =          53.00 using 59 PHA bins.
# Reduced chi-squared =         0.9637 for     55 degrees of freedom 
# Null hypothesis probability =   5.512787e-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]    : 20.0956  (  )
R^2/D10^2   : 0.174615  (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared =         137.60 using 59 PHA bins.
# Reduced chi-squared =         2.4140 for     57 degrees of freedom 
# Null hypothesis probability =   1.290279e-08
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.357e-08   1.460e-09
25- 50  6.780e-08   5.530e-09
50-150  2.031e-07   1.700e-08
15-150  2.845e-07   1.810e-08
Thermal bremsstrahlung (OTTB)
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 199.994       (      )
Norm        : 16.2428       (-16.2428     -16.2428)
------------------------------------------------------------
# Chi-Squared =          95.08 using 59 PHA bins.
# Reduced chi-squared =          1.668 for     57 degrees of freedom 
# Null hypothesis probability =   1.161197e-03
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.045e-08   2.084e-08
25- 50  7.781e-08   4.022e-08
50-150  1.706e-07   8.805e-08
15-150  2.889e-07   1.501e-07
Double BB
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 6.85334        (-1.26248      1.58495)
R1^2/D10^2  : 3.52484        (-1.7657      3.91195)
kT2 [keV]   : 30.3265        (-3.95589      6.13811)
R2^2/D10^2  : 4.01296E-02    (-0.0181908   0.0165377)
------------------------------------------------------------
# Chi-Squared =          53.66 using 59 PHA bins.
# Reduced chi-squared =         0.9757 for     55 degrees of freedom 
# Null hypothesis probability =   5.257838e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.174e-08   8.070e-09
25- 50  6.971e-08   1.077e-08
50-150  2.351e-07   3.355e-08
15-150  3.366e-07   4.370e-08
Plot creation:
Tue Mar 27 11:46:38 EDT 2012