batgrbproduct Analysis for Trigger=446674

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time (local time): Thu Feb 24 07:24:07 EST 2011
             Host Name: gcn5
   Current Working Dir: /local/data/raid16/prebascript_archive/trigger446674/SDC
======================================================================

  Trigger: 00446674      Segment: 000

  BAT Trigger Time: 320187425.92   [s; MET]
      Trigger Stop: 320187427.968   [s; MET]
               UTC: 2011-02-23T20:56:59.226720    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 345.599224203527   Dec: 87.5675078814022  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.37
     Image Trigger?:     NO
     Rate S/N Ratio:     9.89949493661167  [ if not an image trigger ]
     Image S/N Ratio:    7.37

  Flight Position:   [ source = BAT ]
    RA: 345.599224203527   Dec: 87.5675078814022  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 345.386232797474   Dec: 87.5864685874389  [deg; J2000]  
        { 23h 01m 32.7s , +87d 35' 11.3" }
         +/- 2.51073176452441 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.81551558538715 [arcmin] (formal 1-sigma fit error)
    SNR: 8.16535497795121
 
  Angular difference between Flight and Ground position is 1.259415 arcmin
 
  Partial Coding Fraction: 0.6015625    [ including projection effects ]

  Duration
     T90: 7 +/- 2.23606797749979
        Measured from: 0.0799999833106995
                   to: 7.0799999833107     [s; relative to TRIGTIME]
     T50: 4 +/- 2
        Measured from: 0.0799999833106995
                   to: 4.0799999833107     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.0799999833106995     
                   to: 1.0799999833107     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 0.0799999833106995     
                   to: 8.0799999833107     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.088431   0.111119   0.067790   0.004303
           0.018218   0.018346   0.016662   0.014840 [error]
 Peak      0.023449   0.029100   0.026244   0.003676
           0.006796   0.006592   0.006241   0.005518 [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 2.67e-08 4.34e-08 5.34e-08 1.30e-07 1.60e-07 2.53e-07   erg/cm2
              Error 7.32e-09 8.23e-09 1.56e-08 7.65e-08 3.70e-08 9.24e-08   erg/cm2
Peak flux Power-law 2.40e-01 2.10e-01 1.26e-01 1.14e-01 6.24e-01 6.90e-01   ph/cm2/s
              Error 9.11e-02 5.35e-02 4.99e-02 8.94e-02 1.59e-01 1.82e-01   ph/cm2/s
 
Fluence   Cutoff-PL 2.38e-08 4.91e-08 5.40e-08 3.20e-08 1.48e-07 1.59e-07   erg/cm2
              Error 8.44e-09 1.10e-08 1.83e-08 5.17e-08 3.84e-08 6.05e-08   erg/cm2
Peak flux Cutoff-PL 2.09e-01 2.27e-01 1.35e-01 5.26e-02 6.06e-01 6.22e-01   ph/cm2/s
              Error 1.14e-01 6.55e-02 5.82e-02 2.02e-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 2.10e-01 2.26e-01 6.28e-01 0.00e+00 0.00e+00 0.00e+00   ph/cm2/s
              Error 1.61e-01 1.97e-01 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    1.701    0.331    -      -           2.17e-03 4.72e-04   48.390 57
CPL   0.679    1.446      58.4  -21.1      7.86e-03 3.27e-02   46.460 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    1.735    0.480    -      -           4.64e-03 1.41e-03   58.130 57
CPL   0.918    1.885      65.1    0.0      1.22e-02 0.00e+00   57.480 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    8.000    0.080    8.080
T90     7.000    0.080    7.080
T50     4.000    0.080    4.080
Peak    1.000    0.080    1.080

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
  345.3862 +87.5865 0.0235   23.6   66.1       0.2934     8.2  TRIG_00446674       
------------------------------------------
 
Foreground time interval of the image:
  0.080   8.080 (delta_t =   8.000 [sec])
Background time interval of the image:
-239.920   0.080 (delta_t = 240.000 [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    0.080 sec. to    8.080 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.70077     ( -0.319654   0.342726 )
Norm@50keV  : 2.16540E-03    ( -0.000478964   0.000465634 )
------------------------------------------------------------
# Chi-Squared =          48.39 using 59 PHA bins.
# Reduced chi-squared =         0.8490 for     57 degrees of freedom 
# Null hypothesis probability =   7.844146e-01
 
Photon flux (15-150 keV)    in 8 sec: 0.287665 ( -0.0545465  0.0545534 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.60382e-07 ( -3.62972e-08  3.76753e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from    0.080 sec. to    8.080 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.678573     ( -1.69304   1.19923 )
Epeak [keV] : 58.3657      ( -16.2277 -58.3497 )
Norm@50keV  : 7.86011E-03    ( -0.0078741   0.0575951 )
------------------------------------------------------------
# Chi-Squared =          46.46 using 59 PHA bins.
# Reduced chi-squared =         0.8296 for     56 degrees of freedom 
# Null hypothesis probability =   8.144558e-01
 
Photon flux (15-150 keV)    in 8 sec: 0.278159 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.47606e-07 ( -3.66216e-08  4.02264e-08 ) ergs/cm2
 
Band function
Time interval is from    0.080 sec. to    8.080 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.676405   ( 1.05787   2.17242 )
beta        : -10.00000    ( 4.99885e+11   4.99885e+11 )
Epeak [keV] : 58.3174      ( -18.96 -58.3174 )
Norm@50keV   : 7.88058E-03    ( -0.00788064   0.0576772 )
------------------------------------------------------------
# Chi-Squared =          46.46 using 59 PHA bins.
# Reduced chi-squared =         0.8447 for     55 degrees of freedom 
# Null hypothesis probability =   7.870444e-01
 
Photon flux (15-150 keV)    in 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]    :   (  )
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    0.080 sec. to    1.080 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.73512     ( -0.447327   0.512628 )
Norm@50keV  : 4.64279E-03    ( -0.00144648   0.00136647 )
------------------------------------------------------------
# Chi-Squared =          58.13 using 59 PHA bins.
# Reduced chi-squared =          1.020 for     57 degrees of freedom 
# Null hypothesis probability =   4.336093e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.624360 ( -0.158879  0.158896 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.28776e-08 ( -1.32022e-08  1.38728e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from    0.080 sec. to    1.080 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.917758     ( -2.48532   1.28447 )
Epeak [keV] : 65.1401      (   )
Norm@50keV  : 1.22155E-02    (     )
------------------------------------------------------------
# Chi-Squared =          57.48 using 59 PHA bins.
# Reduced chi-squared =          1.026 for     56 degrees of freedom 
# Null hypothesis probability =   4.201600e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.605973 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.11279e-08 ( -1.29892e-08  1.17582e-08 ) ergs/cm2
 
Band function
Time interval is from    0.080 sec. to    1.080 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.923481   ( -5.53369   2.64428 )
beta        : -10.00000    ( 4.46596e+11   4.46596e+11 )
Epeak [keV] : 65.4583      ( -62.5923 -65.4587 )
Norm@50keV   : 1.21118E-02    ( -0.0121118   0.171422 )
------------------------------------------------------------
# Chi-Squared =          57.48 using 59 PHA bins.
# Reduced chi-squared =          1.045 for     55 degrees of freedom 
# Null hypothesis probability =   3.834905e-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:
Thu Feb 24 07:39:49 EST 2011