batgrbproduct Analysis for Trigger=445776

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time (local time): Sat Feb 19 00:42:50 EST 2011
             Host Name: gcn5
   Current Working Dir: /local/data/raid16/prebascript_archive/trigger445776/GCN5_download_cron
======================================================================

  Trigger: 00445776      Segment: 000

  BAT Trigger Time: 319705907.128   [s; MET]
      Trigger Stop: 319705907.136   [s; MET]
               UTC: 2011-02-18T07:11:40.452720    [includes UTCF correction] 
       Where From?: (*SHORT BURST*) TDRSS scaled map message

  BAT 
    RA: 280.306214267364   Dec: -4.8989572973428  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.13
     Image Trigger?:     NO
     Rate S/N Ratio:     18.9472953214964  [ if not an image trigger ]
     Image S/N Ratio:    7.13

  Flight Position:   [ source = BAT ]
    RA: 280.306214267364   Dec: -4.8989572973428  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 280.296077832392   Dec: -4.87386502861791  [deg; J2000]  
        { 18h 41m 11.1s , -04d 52' 25.9" }
         +/- 2.77655301776487 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.63118888184175 [arcmin] (formal 1-sigma fit error)
    SNR: 7.07193763130521
 
  Angular difference between Flight and Ground position is 1.622913 arcmin
 
  Partial Coding Fraction: 1.015625    [ including projection effects ]

  Duration
     T90: 0.0079999566078186 +/- 0.00565686571343518
        Measured from: 0
                   to: 0.0079999566078186     [s; relative to TRIGTIME]
     T50: 0.0079999566078186 +/- 0.004
        Measured from: 0
                   to: 0.0079999566078186     [s; relative to TRIGTIME]

    WARNING: battblocks failed.  Used TDRSS fore/background intervals

  Fluence
     Peak Flux  (peak 0.0079999566078186 second)
        Measured from: -2.98023223876953e-08     
                   to: 0.00799992680549622     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 0     
                   to: 0.0079999566078186     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.003831   0.005700   0.002350   0.000544
           0.000929   0.001034   0.000796   0.000486 [error]
 Peak      0.003831   0.005700   0.002350   0.000544
           0.000929   0.001034   0.000796   0.000486 [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 1.13e-09 8.14e-10 3.88e-10 2.61e-10 2.46e-09 2.61e-09   erg/cm2
              Error 3.84e-10 2.98e-10 2.30e-10 2.97e-10 8.46e-10 9.48e-10   erg/cm2
Peak flux Power-law 4.70e+00 1.91e+00 4.55e-01 1.32e-01 7.15e+00 7.21e+00   ph/cm2/s
              Error 1.62e+00 6.84e-01 2.63e-01 1.43e-01 2.30e+00 2.32e+00   ph/cm2/s
 
Fluence   Cutoff-PL 6.53e-10 2.91e-09 3.61e-10 4.60e-14 3.92e-09 3.93e-09   erg/cm2
              Error 3.85e-10 8.03e-10 3.49e-10 1.18e-12 9.55e-10 9.58e-10   erg/cm2
Peak flux Cutoff-PL 2.43e+00 6.58e+00 5.01e-01 3.43e-05 9.50e+00 9.50e+00   ph/cm2/s
              Error 1.52e+00 1.75e+00 3.75e-01 2.35e+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    3.063    0.523    -      -           2.48e-02 1.19e-02   56.570 57
CPL  -9.003    0.000      35.1    3.6      4.80e+05 0.00e+00   33.130 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    3.063    0.523    -      -           2.48e-02 1.19e-02   56.570 57
CPL  -9.003    0.000      35.1    3.6      4.80e+05 0.00e+00   33.130 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    0.008    0.000    0.008
T90     0.008    0.000    0.008
T50     0.008    0.000    0.008
Peak    0.008   -0.000    0.008

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
  280.2961  -4.8739 0.0271   15.6 -161.1       0.0119     7.1  TRIG_00445776       
------------------------------------------
 
Foreground time interval of the image:
  0.000   0.008 (delta_t =   0.008 [sec])
Background time interval of the image:
-239.128  -3.128 (delta_t = 236.000 [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    0.000 sec. to    0.008 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 3.06294     ( -0.446206   0.599848 )
Norm@50keV  : 2.48381E-02    ( -0.011891   0.0118925 )
------------------------------------------------------------
# Chi-Squared =          56.57 using 59 PHA bins.
# Reduced chi-squared =         0.9924 for     57 degrees of freedom 
# Null hypothesis probability =   4.912674e-01
 
Photon flux (15-150 keV)    in 0.008 sec: 7.15325 ( -2.30061  2.30061 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.45569e-09 ( -8.3824e-10  8.53424e-10 ) ergs/cm2
 
Cutoff power-law model
Time interval is from    0.000 sec. to    0.008 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -9.00325     (     )
Epeak [keV] : 35.0791      ( -3.65846 3.58473 )
Norm@50keV  : 4.80455E+05    (     )
------------------------------------------------------------
# Chi-Squared =          33.13 using 59 PHA bins.
# Reduced chi-squared =         0.5915 for     56 degrees of freedom 
# Null hypothesis probability =   9.936039e-01
 
Photon flux (15-150 keV)    in 0.008 sec: 9.50277 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.92482e-09 ( -9.50056e-10  9.60192e-10 ) ergs/cm2
 
Band function
Time interval is from    0.000 sec. to    0.008 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 4.38550   ( -4.2676   2.20044 )
beta        : -9.37167    ( 10   20 )
Epeak [keV] : 33.2516      ( -3.4819 4.03741 )
Norm@50keV   : 1013.12    ( -1013.12   361.333 )
------------------------------------------------------------
# Chi-Squared =          35.03 using 59 PHA bins.
# Reduced chi-squared =         0.6370 for     55 degrees of freedom 
# Null hypothesis probability =   9.835853e-01
 
Photon flux (15-150 keV)    in 0.008 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    0.000 sec. to    0.008 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 3.06294     ( -0.446206   0.599848 )
Norm@50keV  : 2.48381E-02    ( -0.011891   0.0118925 )
------------------------------------------------------------
# Chi-Squared =          56.57 using 59 PHA bins.
# Reduced chi-squared =         0.9924 for     57 degrees of freedom 
# Null hypothesis probability =   4.912674e-01
 
Photon flux (15-150 keV)    in 0.008 sec: 7.15325 ( -2.30061  2.30061 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.45569e-09 ( -8.3824e-10  8.53424e-10 ) ergs/cm2
 
Cutoff power-law model
Time interval is from    0.000 sec. to    0.008 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -9.00325     (     )
Epeak [keV] : 35.0791      ( -3.65846 3.58473 )
Norm@50keV  : 4.80455E+05    (     )
------------------------------------------------------------
# Chi-Squared =          33.13 using 59 PHA bins.
# Reduced chi-squared =         0.5915 for     56 degrees of freedom 
# Null hypothesis probability =   9.936039e-01
 
Photon flux (15-150 keV)    in 0.008 sec: 9.50277 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.92482e-09 ( -9.50056e-10  9.60192e-10 ) ergs/cm2
 
Band function
Time interval is from    0.000 sec. to    0.008 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 4.38550   ( -4.2676   2.20044 )
beta        : -9.37167    ( 10   20 )
Epeak [keV] : 33.2516      ( -3.48191 4.03741 )
Norm@50keV   : 1013.12    ( -1013.12   361.332 )
------------------------------------------------------------
# Chi-Squared =          35.03 using 59 PHA bins.
# Reduced chi-squared =         0.6370 for     55 degrees of freedom 
# Null hypothesis probability =   9.835853e-01
 
Photon flux (15-150 keV)    in 0.008 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 Feb 19 00:59:43 EST 2011