batgrbproduct Analysis for Trigger=450158

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time (local time): Tue Mar 29 01:05:08 EDT 2011
             Host Name: gcn5
   Current Working Dir: /local/data/raid16/prebascript_archive/trigger450158/GCN5_download_cron
======================================================================

  Trigger: 00450158      Segment: 000

  BAT Trigger Time: 323009872   [s; MET]
      Trigger Stop: 323011080   [s; MET]
               UTC: 2011-03-28T12:57:45.200600    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 251.233459410357   Dec: 57.5902460840076  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     NO    [ by BAT flight software ]
     Image S/N Ratio:    7.6
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    7.6

  Flight Position:   [ source = BAT ]
    RA: 251.233459410357   Dec: 57.5902460840076  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 251.270799708315   Dec: 57.6114086794127  [deg; J2000]  
        { 16h 45m 05.0s , +57d 36' 41.1" }
         +/- 3.53296136814303 [arcmin] (estimated 90% radius based on SNR)
         +/- 2.24385600250737 [arcmin] (formal 1-sigma fit error)
    SNR: 5.01259740418875
 
  Angular difference between Flight and Ground position is 1.747386 arcmin
 
  Partial Coding Fraction: 0.53125    [ including projection effects ]

  Duration
     T90: 1208 +/- 
        Measured from: 0
                   to: 1208     [s; relative to TRIGTIME]
     T50: 1208 +/- 
        Measured from: 0
                   to: 1208     [s; relative to TRIGTIME]

    WARNING: battblocks failed.  Used TDRSS fore/background intervals

  Fluence
     Peak Flux  (peak 1208 second)
        Measured from: 0     
                   to: 1208     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 0     
                   to: 1208     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.889502   1.050149   0.496353   0.079871
           0.191919   0.200608   0.187019   0.187088 [error]
 Peak      0.889502   1.050149   0.496353   0.079871
           0.191919   0.200608   0.187019   0.187088 [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 2.85e-07 4.30e-07 4.87e-07 1.05e-06 1.52e-06 2.25e-06   erg/cm2
              Error 9.19e-08 9.84e-08 1.77e-07 7.75e-07 4.18e-07 9.63e-07   erg/cm2
Peak flux Power-law 1.41e-02 1.17e-02 6.63e-03 5.55e-03 3.49e-02 3.80e-02   ph/cm2/s
              Error 4.63e-03 2.68e-03 2.33e-03 3.80e-03 7.97e-03 8.87e-03   ph/cm2/s
 
Fluence   Cutoff-PL 2.69e-07 4.91e-07 4.34e-07 1.69e-07 1.32e-06 1.36e-06   erg/cm2
              Error 1.00e-07 1.17e-07 3.29e-07 8.99e-07 4.98e-07 1.13e-06   erg/cm2
Peak flux Cutoff-PL 1.31e-02 1.33e-02 6.12e-03 1.23e-03 3.36e-02 3.38e-02   ph/cm2/s
              Error 5.09e-03 4.13e-03 4.50e-03 7.15e-03 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    1.822    0.410    -      -           2.51e-04 6.82e-05   53.210 57
CPL   1.002    2.627      48.5    0.0      7.78e-04 0.00e+00   52.400 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    1.822    0.410    -      -           2.51e-04 6.82e-05   53.210 57
CPL   1.002    2.627      48.5    0.0      7.78e-04 0.00e+00   52.400 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 1208.000    0.000 1208.000
T90  1208.000    0.000 1208.000
T50  1208.000    0.000 1208.000
Peak 1208.000    0.000 1208.000

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
  251.2708 +57.6114 0.0384   39.8  -23.4       2.7272     5.0  TRIG_00450158       
------------------------------------------
 
Foreground time interval of the image:
 93.000 123.060 (delta_t =  30.060 [sec])
134.000 303.060 (delta_t = 169.060 [sec])
483.000 483.071 (delta_t =   0.071 [sec])
502.000 585.380 (delta_t =  83.380 [sec])
589.000 963.057 (delta_t = 374.056 [sec])
Background time interval of the image:

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
93.000000 123.059800
134.000000 303.060000
483.000000 483.070600
502.000000 585.380000
589.000000 963.056500
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.82191     ( -0.394467   0.425092 )
Norm@50keV  : 2.50805E-04    ( -6.94028e-05   6.70456e-05 )
------------------------------------------------------------
# Chi-Squared =          53.21 using 59 PHA bins.
# Reduced chi-squared =         0.9336 for     57 degrees of freedom 
# Null hypothesis probability =   6.178694e-01
 
Photon flux (15-150 keV)    in 656.6 sec: 3.48588E-02 ( -0.00796841  0.00797061 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.51504e-06 ( -4.08179e-07  4.28405e-07 ) ergs/cm2
 
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
93.000000 123.059800
134.000000 303.060000
483.000000 483.070600
502.000000 585.380000
589.000000 963.056500
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.00164     ( -4.10578   1.14828 )
Epeak [keV] : 48.4684      (   )
Norm@50keV  : 7.77562E-04    (     )
------------------------------------------------------------
# Chi-Squared =          52.40 using 59 PHA bins.
# Reduced chi-squared =         0.9356 for     56 degrees of freedom 
# Null hypothesis probability =   6.120704e-01
 
Photon flux (15-150 keV)    in 656.6 sec: 3.35598E-02 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.31795e-06 ( -4.52351e-07  5.44118e-07 ) ergs/cm2
 
Band function
Multiple GTIs in the spectrum
tstart tstop
93.000000 123.059800
134.000000 303.060000
483.000000 483.070600
502.000000 585.380000
589.000000 963.056500
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 4.96790   ( -61.4977   -61.4977 )
beta        : -2.20455    ( -1.20768   0.595655 )
Epeak [keV] : 26.7223      ( -17.6577 8.32798 )
Norm@50keV   : 24.0008    ( -20.4193   9.35813 )
------------------------------------------------------------
# Chi-Squared =          50.55 using 59 PHA bins.
# Reduced chi-squared =         0.9191 for     55 degrees of freedom 
# Null hypothesis probability =   6.450296e-01
 
Photon flux (15-150 keV)    in 656.6 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  589.000 sec. to  963.057 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.82191     ( -0.394467   0.425092 )
Norm@50keV  : 2.50805E-04    ( -6.94028e-05   6.70456e-05 )
------------------------------------------------------------
# Chi-Squared =          53.21 using 59 PHA bins.
# Reduced chi-squared =         0.9336 for     57 degrees of freedom 
# Null hypothesis probability =   6.178694e-01
 
Photon flux (15-150 keV)    in 656.6 sec: 3.48588E-02 ( -0.00796841  0.00797061 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.51504e-06 ( -4.08179e-07  4.28405e-07 ) ergs/cm2
 
Cutoff power-law model
Time interval is from  589.000 sec. to  963.057 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.00164     ( -4.10578   1.14828 )
Epeak [keV] : 48.4684      (   )
Norm@50keV  : 7.77562E-04    (     )
------------------------------------------------------------
# Chi-Squared =          52.40 using 59 PHA bins.
# Reduced chi-squared =         0.9356 for     56 degrees of freedom 
# Null hypothesis probability =   6.120704e-01
 
Photon flux (15-150 keV)    in 656.6 sec: 3.35598E-02 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.31795e-06 ( -4.52351e-07  5.44118e-07 ) ergs/cm2
 
Band function
Time interval is from  589.000 sec. to  963.057 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 4.96790   ( -61.4977   -61.4977 )
beta        : -2.20455    ( -1.20768   0.595655 )
Epeak [keV] : 26.7223      ( -17.6577 8.32798 )
Norm@50keV   : 24.0008    ( -20.4193   9.35813 )
------------------------------------------------------------
# Chi-Squared =          50.55 using 59 PHA bins.
# Reduced chi-squared =         0.9191 for     55 degrees of freedom 
# Null hypothesis probability =   6.450296e-01
 
Photon flux (15-150 keV)    in 656.6 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:
Tue Mar 29 01:21:54 EDT 2011