batgrbproduct Analysis for Trigger=450545

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time (local time): Sat Apr  2 09:55:47 EDT 2011
             Host Name: gcn5
   Current Working Dir: /local/data/raid16/prebascript_archive/trigger450545/GCN5_download_cron
======================================================================

  Trigger: 00450545      Segment: 000

  BAT Trigger Time: 323395984   [s; MET]
      Trigger Stop: 323396056   [s; MET]
               UTC: 2011-04-02T00:12:57.186040    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 197.4192884111   Dec: 61.2417618407497  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    11.87
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    11.87

  Flight Position:   [ source = BAT ]
    RA: 197.4192884111   Dec: 61.2417618407497  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 197.43215734958   Dec: 61.247137366357  [deg; J2000]  
        { 13h 09m 43.7s , +61d 14' 49.7" }
         +/- 1.70072516931859 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.552464873488352 [arcmin] (formal 1-sigma fit error)
    SNR: 14.2442975998809
 
  Angular difference between Flight and Ground position is 0.491940 arcmin
 
  Partial Coding Fraction: 0.1074219    [ including projection effects ]

  Duration
     T90: 60.8960000276566 +/- 6.93581545664705
        Measured from: 2.55200010538101
                   to: 63.4480001330376     [s; relative to TRIGTIME]
     T50: 32.2880000472069 +/- 11.7788692003121
        Measured from: 6.02400010824203
                   to: 38.3120001554489     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 3.18000000715256     
                   to: 4.18000000715256     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.375999987125397     
                   to: 69.7039999961853     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.302149   1.906221   1.374757   0.487331
           0.156034   0.163667   0.145190   0.125432 [error]
 Peak      0.074010   0.155779   0.178067   0.083555
           0.022104   0.025389   0.024958   0.021134 [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 5.05e-07 8.78e-07 1.17e-06 3.16e-06 3.40e-06 5.71e-06   erg/cm2
              Error 8.43e-08 8.93e-08 1.44e-07 8.42e-07 3.50e-07 9.48e-07   erg/cm2
Peak flux Power-law 8.74e-01 1.22e+00 1.26e+00 2.38e+00 4.11e+00 5.74e+00   ph/cm2/s
              Error 3.00e-01 2.57e-01 1.91e-01 7.97e-01 6.65e-01 8.96e-01   ph/cm2/s
 
Fluence   Cutoff-PL 4.92e-07 8.94e-07 1.18e-06 2.50e-06 3.37e-06 5.06e-06   erg/cm2
              Error 9.83e-08 1.06e-07 1.47e-07 1.51e-06 3.75e-07 1.55e-06   erg/cm2
Peak flux Cutoff-PL 8.72e-01 1.22e+00 1.26e+00 2.37e+00 4.11e+00 5.72e+00   ph/cm2/s
              Error 3.00e-01 2.57e-01 1.91e-01 8.93e-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 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    1.591    0.167    -      -           5.19e-03 5.03e-04   56.200 57
CPL   1.351    0.530     138.3    0.0      6.82e-03 0.00e+00   56.070 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    0.953    0.271    -      -           3.58e-02 5.68e-03   43.760 57
CPL   0.952    0.273    9999.4    0.0      3.60e-02 2.90e-02   43.770 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: 34.880000 sec.
T50 in the 50-300 keV band: 20.928000 sec.
 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   70.080   -0.376   69.704
T90    60.896    2.552   63.448
T50    32.288    6.024   38.312
Peak    1.000    3.180    4.180

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
  197.4322 +61.2471 0.0135   48.1   28.1       5.2766    14.2  TRIG_00450545       
------------------------------------------
 
Foreground time interval of the image:
 -0.376  69.704 (delta_t =  70.080 [sec])
Background time interval of the image:
-239.000  -0.376 (delta_t = 238.624 [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   -0.376 sec. to   69.704 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.59070     ( -0.166437   0.168119 )
Norm@50keV  : 5.18616E-03    ( -0.000503871   0.000501291 )
------------------------------------------------------------
# Chi-Squared =          56.20 using 59 PHA bins.
# Reduced chi-squared =         0.9859 for     57 degrees of freedom 
# Null hypothesis probability =   5.051400e-01
 
Photon flux (15-150 keV)    in 70.08 sec: 0.664537 ( -0.0664833  0.0666953 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.4029e-06 ( -3.49557e-07  3.51296e-07 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   -0.376 sec. to   69.704 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.35128     ( -0.66417   0.395415 )
Epeak [keV] : 138.292      (   )
Norm@50keV  : 6.82385E-03    (     )
------------------------------------------------------------
# Chi-Squared =          56.07 using 59 PHA bins.
# Reduced chi-squared =          1.001 for     56 degrees of freedom 
# Null hypothesis probability =   4.722528e-01
 
Photon flux (15-150 keV)    in 70.08 sec: 0.659888 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.37231e-06 ( -3.78698e-07  3.71922e-07 ) ergs/cm2
 
Band function
Time interval is from   -0.376 sec. to   69.704 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.02320   ( 1.0232   1.0232 )
beta        : -1.73554    ( 1.73554   0.289487 )
Epeak [keV] : 72.2613      ( -72.2614 -72.2614 )
Norm@50keV   : 1.07505E-02    ( -0.0107505   119.745 )
------------------------------------------------------------
# Chi-Squared =          55.54 using 59 PHA bins.
# Reduced chi-squared =          1.010 for     55 degrees of freedom 
# Null hypothesis probability =   4.543238e-01
 
Photon flux (15-150 keV)    in 70.08 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    3.180 sec. to    4.180 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.952998     ( -0.279665   0.262265 )
Norm@50keV  : 3.57683E-02    ( -0.00574731   0.00561968 )
------------------------------------------------------------
# Chi-Squared =          43.76 using 59 PHA bins.
# Reduced chi-squared =         0.7677 for     57 degrees of freedom 
# Null hypothesis probability =   9.010721e-01
 
Photon flux (15-150 keV)    in 1 sec: 4.10954 ( -0.662002  0.667392 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.93431e-07 ( -6.00646e-08  6.01881e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from    3.180 sec. to    4.180 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.952411     ( -0.286213   0.260444 )
Epeak [keV] : 9999.36      ( -9998.22 -9998.22 )
Norm@50keV  : 3.60284E-02    ( -0.00538359   0.0527129 )
------------------------------------------------------------
# Chi-Squared =          43.77 using 59 PHA bins.
# Reduced chi-squared =         0.7815 for     56 degrees of freedom 
# Null hypothesis probability =   8.827183e-01
 
Photon flux (15-150 keV)    in 1 sec: 4.10859 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.93611e-07 ( -6.0104e-08  6.0233e-08 ) ergs/cm2
 
Band function
Time interval is from    3.180 sec. to    4.180 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.782498   ( 0.782498   0.782498 )
beta        : -0.952999    ( 0.952999   0.279651 )
Epeak [keV] : 52.3028      ( -52.3028 -52.3028 )
Norm@50keV   : 5.88541E-02    ( -0.0284474   15346 )
------------------------------------------------------------
# Chi-Squared =          43.76 using 59 PHA bins.
# Reduced chi-squared =         0.7957 for     55 degrees of freedom 
# Null hypothesis probability =   8.621329e-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  2 10:22:45 EDT 2011