batgrbproduct Analysis for Trigger=508712

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time (local time): Wed Nov 30 13:01:30 EST 2011
             Host Name: gcn5
   Current Working Dir: /local/data/raid16/prebascript_archive/trigger508712/GCN5_download_cron
======================================================================

  Trigger: 00508712      Segment: 000

  BAT Trigger Time: 344276301.952   [s; MET]
      Trigger Stop: 344276304   [s; MET]
               UTC: 2011-11-29T16:18:14.327920    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 307.440815849486   Dec: -52.7242285825363  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.34
     Image Trigger?:     NO
     Rate S/N Ratio:     10.1980390271856  [ if not an image trigger ]
     Image S/N Ratio:    7.34

  Flight Position:   [ source = BAT ]
    RA: 307.440815849486   Dec: -52.7242285825363  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 307.420855518498   Dec: -52.7225718911987  [deg; J2000]  
        { 20h 29m 41.0s , -52d 43' 21.3" }
         +/- 2.13335751300087 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.932082389450831 [arcmin] (formal 1-sigma fit error)
    SNR: 10.3045128078963
 
  Angular difference between Flight and Ground position is 0.732134 arcmin
 
  Partial Coding Fraction: 0.6171875    [ including projection effects ]

  Duration
     T90: 7.86799991130829 +/- 1.14318327726811
        Measured from: -6.06399989128113
                   to: 1.80400002002716     [s; relative to TRIGTIME]
     T50: 5.63599997758865 +/- 1.35061466629333
        Measured from: -4.42399990558624
                   to: 1.21200007200241     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.407999992370605     
                   to: 1.40799999237061     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -6.29199999570847     
                   to: 2.87999999523163     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.183273   0.150368   0.053255   0.002264
           0.022380   0.022377   0.019351   0.016379 [error]
 Peak      0.044936   0.037827   0.017051  -0.006566
           0.008068   0.007679   0.006551   0.005417 [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 6.17e-08 6.01e-08 4.09e-08 4.37e-08 1.80e-07 2.06e-07   erg/cm2
              Error 1.21e-08 1.18e-08 1.64e-08 3.30e-08 3.85e-08 5.78e-08   erg/cm2
Peak flux Power-law 4.81e-01 2.97e-01 1.18e-01 6.28e-02 9.28e-01 9.58e-01   ph/cm2/s
              Error 1.38e-01 6.84e-02 5.21e-02 5.23e-02 2.01e-01 2.09e-01   ph/cm2/s
 
Fluence   Cutoff-PL 6.16e-08 6.13e-08 3.90e-08 2.70e-08 1.76e-07 1.89e-07   erg/cm2
              Error 1.22e-08 1.41e-08 2.91e-08 4.19e-08 5.64e-08 6.99e-08   erg/cm2
Peak flux Cutoff-PL 4.66e-01 3.12e-01 1.15e-01 3.39e-02 9.16e-01 9.27e-01   ph/cm2/s
              Error 1.50e-01 8.68e-02 8.62e-02 6.19e-02 2.04e-01 2.21e-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 9.36e-01 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    0.000    0.000    -      -           0.00e+00 0.00e+00    0.000  0
CPL   1.955    0.000       2.5    0.0      4.81e-03 0.00e+00   39.480 56
 
The chi2 of BB fit is 43.60 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    0.000    0.000    -      -           0.00e+00 0.00e+00    0.000  0
CPL   1.898    0.000       9.2    0.0      9.51e-03 0.00e+00   52.540 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100    9.172   -6.292    2.880
T90     7.868   -6.064    1.804
T50     5.636   -4.424    1.212
Peak    1.000    0.408    1.408

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
  307.4209 -52.7226 0.0186   33.8  -40.0       0.4247    10.3  TRIG_00508712       
------------------------------------------
 
Foreground time interval of the image:
 -6.292   2.880 (delta_t =   9.172 [sec])
Background time interval of the image:
-239.952  -6.292 (delta_t = 233.660 [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   -6.292 sec. to    2.880 sec.
XSPEC12>exit
 XSPEC: quit
 
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index:      (     )
Norm@50keV  :     (     )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in 9.172 sec: 0.393421 ( -0.0637974  0.0638211 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.80283e-07 ( -3.73209e-08  3.96704e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   -6.292 sec. to    2.880 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.95507     (     )
Epeak [keV] : 2.50465      (   )
Norm@50keV  : 4.80662E-03    (     )
------------------------------------------------------------
# Chi-Squared =          39.48 using 59 PHA bins.
# Reduced chi-squared =         0.7050 for     56 degrees of freedom 
# Null hypothesis probability =   9.538163e-01
 
Photon flux (15-150 keV)    in 9.172 sec: 0.391148 ( -0.06522  0.064747 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.75763e-07 ( -6.91688e-08  4.37119e-08 ) ergs/cm2
 
Band function
Time interval is from   -6.292 sec. to    2.880 sec.
XSPEC12>exit
 XSPEC: quit
 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       :    (     )
beta        :     (     )
Epeak [keV] :       (   )
Norm@50keV   :     (     )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in 9.172 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]    : 6.18024  (-1.0173  1.21805)
R^2/D10^2   : 1.24377  (-0.669787   1.49114)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared =          43.60 using 59 PHA bins.
# Reduced chi-squared =         0.7649 for     57 degrees of freedom 
# Null hypothesis probability =   9.042049e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  6.034e-08   1.837e-08
25- 50  6.413e-08   2.204e-08
50-150  6.620e-09   3.998e-09
15-150  1.311e-07   3.630e-08
Thermal bremsstrahlung (OTTB)
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 27.1278       (-9.30162      16.4598)
Norm        : 3.43195       (-1.14393     1.96272)
------------------------------------------------------------
# Chi-Squared =          40.08 using 59 PHA bins.
# Reduced chi-squared =         0.7032 for     57 degrees of freedom 
# Null hypothesis probability =   9.564822e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  6.063e-08   1.208e-08
25- 50  6.537e-08   1.840e-08
50-150  3.124e-08   1.866e-08
15-150  1.572e-07   4.187e-08
Double BB
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 5.28912        (-1.25675      1.27213)
R1^2/D10^2  : 2.18574        (-1.299      4.59553)
kT2 [keV]   : 24.6131        (-12.9821      120.469)
R2^2/D10^2  : 2.50402E-03    (-0.00251935   0.0473284)
------------------------------------------------------------
# Chi-Squared =          37.48 using 59 PHA bins.
# Reduced chi-squared =         0.6814 for     55 degrees of freedom 
# Null hypothesis probability =   9.660206e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  6.317e-08   3.349e-08
25- 50  5.916e-08   3.059e-08
50-150  6.415e-08   4.520e-08
15-150  1.865e-07   8.785e-08

Peak spectrum fit

Power-law model
Time interval is from    0.408 sec. to    1.408 sec.
XSPEC12>exit
 XSPEC: quit
 
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index:      (     )
Norm@50keV  :     (     )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in 1 sec: 0.927814 ( -0.200966  0.200967 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.0095e-08 ( -1.32605e-08  1.40177e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from    0.408 sec. to    1.408 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.89829     (     )
Epeak [keV] : 9.22596      (   )
Norm@50keV  : 9.51425E-03    (     )
------------------------------------------------------------
# Chi-Squared =          52.54 using 59 PHA bins.
# Reduced chi-squared =         0.9382 for     56 degrees of freedom 
# Null hypothesis probability =   6.066484e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.916345 ( -0.204312  0.204605 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.83225e-08 ( -1.38337e-08  1.52332e-08 ) ergs/cm2
 
Band function
Time interval is from    0.408 sec. to    1.408 sec.
XSPEC12>exit
 XSPEC: quit
 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       :    (     )
beta        :     (     )
Epeak [keV] :       (   )
Norm@50keV   :     (     )
------------------------------------------------------------
 
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]    : 7.83065  (-1.78946  2.44444)
R^2/D10^2   : 1.09011  (-0.725782   2.06487)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared =          57.00 using 59 PHA bins.
# Reduced chi-squared =          1.000 for     57 degrees of freedom 
# Null hypothesis probability =   4.750595e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.189e-08   5.736e-09
25- 50  2.005e-08   8.875e-09
50-150  4.903e-09   3.286e-09
15-150  3.684e-08   1.560e-08
Thermal bremsstrahlung (OTTB)
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 41.5015       (-18.1693      41.2926)
Norm        : 5.84087       (-2.02773     3.65873)
------------------------------------------------------------
# Chi-Squared =          52.83 using 59 PHA bins.
# Reduced chi-squared =         0.9268 for     57 degrees of freedom 
# Null hypothesis probability =   6.322358e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.358e-08   4.139e-09
25- 50  1.814e-08   6.665e-09
50-150  1.461e-08   9.131e-09
15-150  4.632e-08   1.623e-08
Double BB
R1^2/D10^2  : 9.68361E+05        (      )
kT2 [keV]   : 8.91309        (-2.27671      3.29661)
R2^2/D10^2  : 0.607976    (-0.453469   0.337496)
------------------------------------------------------------
# Chi-Squared =          52.87 using 59 PHA bins.
# Chi-Squared =          52.23 using 59 PHA bins.
# Chi-Squared =          52.20 using 59 PHA bins.
# Reduced chi-squared =         0.9612 for     55 degrees of freedom 
# Reduced chi-squared =         0.9497 for     55 degrees of freedom 
# Reduced chi-squared =         0.9492 for     55 degrees of freedom 
# Null hypothesis probability =   5.566249e-01
# Null hypothesis probability =   5.810461e-01
# Null hypothesis probability =   5.821453e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.389e-08   8.130e-09
25- 50  1.705e-08   8.890e-09
50-150  1.796e-08   1.094e-08
15-150  4.890e-08   2.376e-08
Plot creation:
Wed Nov 30 13:19:19 EST 2011