batgrbproduct Analysis for Trigger=655451

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time (local time): Mon Sep 14 09:38:51 EDT 2015
             Host Name: bat1
   Current Working Dir: /local/data/bat1/prebascript/trigger655451/GCN5_download_cron
======================================================================

  Trigger: 00655451      Segment: 000

  BAT Trigger Time: 463837072   [s; MET]
      Trigger Stop: 463837136   [s; MET]
               UTC: 2015-09-13T11:37:36.871420    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 256.018892334412   Dec: -38.0690195677566  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.79
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    8.79

  Flight Position:   [ source = BAT ]
    RA: 256.018892334412   Dec: -38.0690195677566  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 255.979563773502   Dec: -38.0789676340444  [deg; J2000]  
        { 17h 03m 55.1s , -38d 04' 44.3" }
         +/- 4.49484036625321 [arcmin] (estimated 90% radius based on SNR)
         +/- 2.59544836047304 [arcmin] (formal 1-sigma fit error)
    SNR: 3.55360718566004
 
  Angular difference between Flight and Ground position is 1.951142 arcmin
 
  Partial Coding Fraction: 0.75    [ including projection effects ]

  Duration
     T90: 278.879999935627 +/- 114.963144253513
        Measured from: 67.6560001373291
                   to: 346.536000072956     [s; relative to TRIGTIME]
     T50: 146.811999976635 +/- 199.213848729796
        Measured from: 172.528000116348
                   to: 319.340000092983     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 24.0360000133514     
                   to: 25.0360000133514     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -28.4639999866486     
                   to: 352.351999998093     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.885938   1.232973   0.301435   0.098287
           0.128229   0.114916   0.093061   0.076009 [error]
 Peak      0.024622   0.014409   0.014604   0.002973
           0.007643   0.006999   0.005604   0.004677 [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 6.19e-07 5.10e-07 2.85e-07 2.35e-07 1.52e-06 1.65e-06   erg/cm2
              Error 7.27e-08 6.02e-08 7.01e-08 1.06e-07 1.75e-07 2.26e-07   erg/cm2
Peak flux Power-law 2.19e-01 1.67e-01 8.54e-02 6.26e-02 5.01e-01 5.35e-01   ph/cm2/s
              Error 1.13e-01 5.64e-02 4.74e-02 7.94e-02 1.70e-01 1.81e-01   ph/cm2/s
 
Fluence   Cutoff-PL 5.96e-07 5.73e-07 9.77e-08 1.28e-09 1.27e-06 1.27e-06   erg/cm2
              Error 7.91e-08 7.85e-08 9.68e-08 1.65e-08 1.71e-07 1.72e-07   erg/cm2
Peak flux Cutoff-PL 2.23e-01 1.67e-01 8.39e-02 5.92e-02 5.02e-01 5.35e-01   ph/cm2/s
              Error 1.15e-01 4.73e-02 5.24e-02 7.89e-02 1.70e-01 1.80e-01   ph/cm2/s
 
Fluence        Band -------- -------- -------- -------- -------- --------   erg/cm2
              Error -------- -------- -------- -------- -------- --------   erg/cm2
Peak flux      Band -------- -------- -------- -------- -------- --------   ph/cm2/s
              Error -------- -------- -------- -------- -------- --------   ph/cm2/s
 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    2.840    0.231    -      -           4.13e-04 7.52e-05   57.070 57
CPL   0.040    2.437      20.6    0.0      3.67e-02 0.00e+00   49.030 56
 
The chi2 of BB fit is 50.08 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    1.971    0.711    -      -           3.38e-03 1.44e-03   41.170 57
CPL   1.967    1.768     233.8   -0.1      3.41e-03 0.00e+00   41.170 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  380.816  -28.464  352.352
T90   278.880   67.656  346.536
T50   146.812  172.528  319.340
Peak    1.000   24.036   25.036

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
  255.9796 -38.0790 0.0542   24.3  150.3       0.5847     3.6  TRIG_00655451       
------------------------------------------
 
Foreground time interval of the image:
-28.464  74.401 (delta_t = 102.865 [sec])
Background time interval of the image:
-239.000 -28.464 (delta_t = 210.536 [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
-28.464000 187.970000
241.000000 352.352000
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.83966     ( -0.221649   0.239612 )
Norm@50keV  : 4.13181E-04    ( -7.44515e-05   7.59849e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.07 using 59 PHA bins.
# Reduced chi-squared =          1.001 for     57 degrees of freedom 
# Null hypothesis probability =   4.724176e-01
 
Photon flux (15-150 keV)    in 327.8 sec: 0.101383 ( -0.00979601  0.00979724 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.51855e-06 ( -1.72092e-07  1.77296e-07 ) ergs/cm2
 
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-28.464000 187.970000
241.000000 352.352000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 4.00571E-02     ( -3.02129   1.85366 )
Epeak [keV] : 20.6268      (   )
Norm@50keV  : 3.66664E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.03 using 59 PHA bins.
# Reduced chi-squared =         0.8756 for     56 degrees of freedom 
# Null hypothesis probability =   7.337528e-01
 
Photon flux (15-150 keV)    in 327.8 sec: 9.53844E-02 ( -0.0102356  0.0102236 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.26882e-06 ( -1.57469e-07  1.85125e-07 ) ergs/cm2
 
Band function
Multiple GTIs in the spectrum
tstart tstop
-28.464000 187.970000
241.000000 352.352000
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 1.79415   ( -1.81317   -0.667605 )
beta        : -3.87363    ( 3.84291   0.730295 )
Epeak [keV] : 22.4774      ( -6.95837 3.72066 )
Norm@50keV   : 0.874103    ( -0.85419   95.7876 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          46.09 using 59 PHA bins.
# Reduced chi-squared =         0.8381 for     55 degrees of freedom 
# Null hypothesis probability =   7.982752e-01
 
Photon flux (15-150 keV)    in 327.8 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]    : 5.96032  (-0.532254  0.587737)
R^2/D10^2   : 0.379543  (-0.132048   0.203941)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.08 using 59 PHA bins.
# Reduced chi-squared =         0.8786 for     57 degrees of freedom 
# Null hypothesis probability =   7.300787e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  5.817e-07   9.588e-08
25- 50  5.717e-07   9.785e-08
50-150  5.095e-08   2.225e-08
15-150  1.204e-06   1.632e-07
Thermal bremsstrahlung (OTTB)
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 21.0486       (-3.83279      5.00334)
Norm        : 1.15211       (-0.257567     0.34772)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.33 using 59 PHA bins.
# Reduced chi-squared =         0.8830 for     57 degrees of freedom 
# Null hypothesis probability =   7.215916e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  6.109e-07   7.671e-08
25- 50  5.560e-07   7.752e-08
50-150  1.812e-07   7.616e-08
15-150  1.348e-06   1.775e-07
Double BB
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 5.55499        (-0.952037      0.748364)
R1^2/D10^2  : 0.492605        (-0.203751      0.460687)
kT2 [keV]   : 24.5093        (-15.9197      -24.6216)
R2^2/D10^2  : 2.97133E-04    (-0.000291888   0.0300442)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          45.53 using 59 PHA bins.
# Reduced chi-squared =         0.8279 for     55 degrees of freedom 
# Null hypothesis probability =   8.148439e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  5.979e-07   1.292e-07
25- 50  5.508e-07   1.468e-07
50-150  2.901e-07   1.908e-07
15-150  1.439e-06   3.329e-07

Peak spectrum fit

Power-law model
Time interval is from   24.036 sec. to   25.036 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.97106     ( -0.651896   0.770061 )
Norm@50keV  : 3.38467E-03    ( -0.00151516   0.00137216 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          41.17 using 59 PHA bins.
# Reduced chi-squared =         0.7224 for     57 degrees of freedom 
# Null hypothesis probability =   9.432894e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.501061 ( -0.170356  0.170588 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.11711e-08 ( -1.22305e-08  1.28894e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   24.036 sec. to   25.036 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.96736     ( -2.53884   0.996169 )
Epeak [keV] : 233.801      ( -9962.85 -9963.06 )
Norm@50keV  : 3.41208E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          41.17 using 59 PHA bins.
# Reduced chi-squared =         0.7353 for     56 degrees of freedom 
# Null hypothesis probability =   9.310256e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.502000 ( -0.171316  0.16947 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.13659e-08 ( -1.29268e-08  1.24869e-08 ) ergs/cm2
 
Band function
Time interval is from   24.036 sec. to   25.036 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.73450   ( 1.73937   1.73937 )
beta        : -1.95988    ( 1.97584   0.656046 )
Epeak [keV] : 29.4423      ( -26.1714 -26.1714 )
Norm@50keV   : 4.99018E-03    ( -0.00267286   0.542948 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          41.17 using 59 PHA bins.
# Reduced chi-squared =         0.7486 for     55 degrees of freedom 
# Null hypothesis probability =   9.167500e-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]    : 11.0500  (-5.52807  7.93146)
R^2/D10^2   : 0.151817  (-0.14784   2.06437)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          45.21 using 59 PHA bins.
# Reduced chi-squared =         0.7931 for     57 degrees of freedom 
# Null hypothesis probability =   8.702756e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.877e-09   2.434e-09
25- 50  1.103e-08   6.910e-09
50-150  7.631e-09   5.960e-09
15-150  2.253e-08   1.434e-08
Thermal bremsstrahlung (OTTB)
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 77.7467       (-77.7598      -77.7598)
Norm        : 2.34073       (-0.997879     2.23491)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          41.63 using 59 PHA bins.
# Reduced chi-squared =         0.7303 for     57 degrees of freedom 
# Null hypothesis probability =   9.370217e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  6.062e-09   3.829e-09
25- 50  9.910e-09   6.200e-09
50-150  1.372e-08   1.145e-08
15-150  2.969e-08   2.147e-08
Double BB
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 4.27439        (-2.36513      4.71178)
R1^2/D10^2  : 5.14325        (-4.88561      15.8114)
kT2 [keV]   : 19.6588        (-9.23296      -19.6407)
R2^2/D10^2  : 1.43178E-02    (-0.0141709   0.147516)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          40.60 using 59 PHA bins.
# Reduced chi-squared =         0.7382 for     55 degrees of freedom 
# Null hypothesis probability =   9.265085e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  7.467e-09   4.444e-09
25- 50  8.066e-09   4.196e-09
50-150  1.516e-08   1.090e-08
15-150  3.069e-08   1.585e-08
Plot creation:
Mon Sep 14 09:43:00 EDT 2015