batgrbproduct Analysis for Trigger=451901

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time (local time): Sat Apr 23 11:46:52 EDT 2011
             Host Name: gcn5
   Current Working Dir: /local/data/raid16/prebascript_archive/trigger451901/GCN5_download_cron
======================================================================

  Trigger: 00451901      Segment: 000

  BAT Trigger Time: 325179722.752   [s; MET]
      Trigger Stop: 325179722.88   [s; MET]
               UTC: 2011-04-22T15:41:55.870640    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 111.994986280231   Dec: 75.1057497440089  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.19
     Image Trigger?:     NO
     Rate S/N Ratio:     27.9463772249642  [ if not an image trigger ]
     Image S/N Ratio:    7.19

  Flight Position:   [ source = BAT ]
    RA: 111.994986280231   Dec: 75.1057497440089  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 112.055205148116   Dec: 75.0999817682526  [deg; J2000]  
        { 07h 28m 13.2s , +75d 05' 59.9" }
         +/- 0.653963410765394 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.285912913309251 [arcmin] (formal 1-sigma fit error)
    SNR: 55.7973342898424
 
  Angular difference between Flight and Ground position is 0.991256 arcmin
 
  Partial Coding Fraction: 0.2265625    [ including projection effects ]

  Duration
     T90: 25.9599999785423 +/- 0.566646277192499
        Measured from: -5.55199986696243
                   to: 20.4080001115799     [s; relative to TRIGTIME]
     T50: 11.0119999647141 +/- 0.200997490359531
        Measured from: 2.60400015115738
                   to: 13.6160001158714     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 6.90400004386902     
                   to: 7.90400004386902     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -11.1559999585152     
                   to: 40.5720000267029     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total    10.691460  19.880805  19.565605   5.594961
           0.125072   0.153658   0.150199   0.101546 [error]
 Peak      0.533978   1.190915   1.412811   0.538908
           0.024912   0.033922   0.037868   0.027644 [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 4.66e-06 9.39e-06 1.47e-05 5.11e-05 4.10e-05 7.98e-05   erg/cm2
              Error 1.39e-07 1.71e-07 1.99e-07 1.54e-06 5.38e-07 1.58e-06   erg/cm2
Peak flux Power-law 6.71e+00 9.20e+00 9.31e+00 1.71e+01 3.07e+01 4.23e+01   ph/cm2/s
              Error 4.38e-01 3.67e-01 3.02e-01 1.19e+00 9.87e-01 1.40e+00   ph/cm2/s
 
Fluence   Cutoff-PL 3.95e-06 9.45e-06 1.57e-05 3.27e-05 4.07e-05 6.18e-05   erg/cm2
              Error 1.87e-07 1.80e-07 2.79e-07 2.82e-06 5.45e-07 2.81e-06   erg/cm2
Peak flux Cutoff-PL 6.19e+00 9.30e+00 9.67e+00 1.33e+01 3.04e+01 3.85e+01   ph/cm2/s
              Error 5.69e-01 3.86e-01 4.05e-01 2.74e+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 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    1.350    0.023    -      -           8.12e-02 1.15e-03  112.500 57
CPL   0.856    0.104     149.5   18.5      1.27e-01 1.16e-02   40.730 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    0.983    0.053    -      -           2.67e-01 8.40e-03   61.960 57
CPL   0.704    0.217     281.6  356.6      3.51e-01 7.36e-02   56.860 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: 23.808000 sec.
T50 in the 50-300 keV band: 9.792000 sec.
 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   51.728  -11.156   40.572
T90    25.960   -5.552   20.408
T50    11.012    2.604   13.616
Peak    1.000    6.904    7.904

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
  112.0552 +75.1000 0.0035   44.7 -135.7      59.0864    55.8  TRIG_00451901       
------------------------------------------
 
Foreground time interval of the image:
-11.156  40.572 (delta_t =  51.728 [sec])
Background time interval of the image:
-239.752 -11.156 (delta_t = 228.596 [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  -11.156 sec. to   40.572 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.35000     ( -0.0231335   0.0230456 )
Norm@50keV  : 8.11955E-02    ( -0.0011501   0.00114817 )
------------------------------------------------------------
# Chi-Squared =         112.50 using 59 PHA bins.
# Reduced chi-squared =         1.9737 for     57 degrees of freedom 
# Null hypothesis probability =   1.656984e-05
 
Photon flux (15-150 keV)    in 51.73 sec: 9.78170 ( -0.161367  0.16182 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.10228e-05 ( -5.38489e-07  5.38473e-07 ) ergs/cm2
 
Cutoff power-law model
Time interval is from  -11.156 sec. to   40.572 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.855569     ( -0.104774   0.102728 )
Epeak [keV] : 149.532      ( -14.9796 22.0015 )
Norm@50keV  : 0.126895    ( -0.0109685   0.0121967 )
------------------------------------------------------------
# Chi-Squared =          40.73 using 59 PHA bins.
# Reduced chi-squared =         0.7273 for     56 degrees of freedom 
# Null hypothesis probability =   9.376794e-01
 
Photon flux (15-150 keV)    in 51.73 sec: 9.42208 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.06858e-05 ( -5.44924e-07  5.44872e-07 ) ergs/cm2
 
Band function
Time interval is from  -11.156 sec. to   40.572 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.814169   ( -0.125385   0.690001 )
beta        : -1.77694    ( 1.77589   0.25671 )
Epeak [keV] : 139.759      ( -74.0165 26.4607 )
Norm@50keV   : 0.132835    ( -0.0149002   0.18788 )
------------------------------------------------------------
# Chi-Squared =          39.83 using 59 PHA bins.
# Reduced chi-squared =         0.7242 for     55 degrees of freedom 
# Null hypothesis probability =   9.383382e-01
 
Photon flux (15-150 keV)    in 51.73 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    6.904 sec. to    7.904 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.982682     ( -0.0531768   0.0528217 )
Norm@50keV  : 0.267033    ( -0.00840656   0.00839175 )
------------------------------------------------------------
# Chi-Squared =          61.96 using 59 PHA bins.
# Reduced chi-squared =          1.087 for     57 degrees of freedom 
# Null hypothesis probability =   3.035675e-01
 
Photon flux (15-150 keV)    in 1 sec: 30.7177 ( -0.985921  0.987245 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.90528e-06 ( -9.48913e-08  9.49371e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from    6.904 sec. to    7.904 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.703920     ( -0.221917   0.211697 )
Epeak [keV] : 281.588      ( -97.4601 615.827 )
Norm@50keV  : 0.351113    ( -0.0645533   0.0825932 )
------------------------------------------------------------
# Chi-Squared =          56.86 using 59 PHA bins.
# Reduced chi-squared =          1.015 for     56 degrees of freedom 
# Null hypothesis probability =   4.428750e-01
 
Photon flux (15-150 keV)    in 1 sec: 30.4325 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.88941e-06 ( 0  0 ) ergs/cm2
 
Band function
Time interval is from    6.904 sec. to    7.904 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 4.99980   ( -9779.09   -9779.09 )
beta        : -1.01007    ( -0.0748758   0.0636973 )
Epeak [keV] : 27.0255      ( -26.6828 6.40089 )
Norm@50keV   : 1.11089E+04    ( -8644.85   2.76812e+07 )
------------------------------------------------------------
# Chi-Squared =          59.82 using 59 PHA bins.
# Reduced chi-squared =          1.088 for     55 degrees of freedom 
# Null hypothesis probability =   3.051869e-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:
Sat Apr 23 12:11:01 EDT 2011