batgrbproduct Analysis for Trigger=205851

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.41
    Process Start Time (local time): Mon Dec 31 18:37:42 EST 2007
             Host Name: gcn5
   Current Working Dir: /local/data/raid2/prebascript/trigger205851/SDC
======================================================================

  Trigger: 00205851      Segment: 000

  BAT Trigger Time: 167022369.344   [s; MET]
      Trigger Stop: 167022370.368   [s; MET]
               UTC: 2006-04-18T03:06:08.204500    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 236.419948391906   Dec: -3.64343384352562  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    10.8
     Image Trigger?:     NO
     Rate S/N Ratio:     28.9309522829789  [ if not an image trigger ]
     Image S/N Ratio:    10.8

  Flight Position:   [ source = BAT ]
    RA: 236.419948391906   Dec: -3.64343384352562  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 236.43091747163   Dec: -3.64279709705034  [deg; J2000]  
        { 15h 45m 43.4s , -03d 38' 34.1" }
         +/- 0.972082890120811 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.419294733032042 [arcmin] (formal 1-sigma fit error)
    SNR: 31.6727006116107
    RA  =  15h 45m 43.4s  (236.430917 deg.)
    Dec =  -3d 38' 34" (-3.642797 deg.)
 
  Angular difference between Flight and Ground position is 0.657925 arcmin
 
  Partial Coding Fraction: 0.3046875    [ including projection effects ]

  Duration
     T90: 144 +/- 45.254833995939
        Measured from: -63.3440000116825
                   to: 80.6559999883175     [s; relative to TRIGTIME]
     T50: 16 +/- 16
        Measured from: 0.65599998831749
                   to: 16.6559999883175     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 8.15599998831749     
                   to: 9.15599998831749     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -95.3440000116825     
                   to: 144.655999988317     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     4.355642   5.192431   3.560397   0.874701
           0.133161   0.121193   0.105737   0.093252 [error]
 Peak      1.383631   1.937348   1.538356   0.423878
           0.047576   0.046904   0.042415   0.033516 [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 1.43e-06 2.29e-06 2.77e-06 6.55e-06 8.36e-06 1.30e-05   erg/cm2
              Error 8.96e-08 7.97e-08 1.11e-07 6.11e-07 2.63e-07 6.64e-07   erg/cm2
Peak flux Power-law 8.85e-01 9.17e-01 6.70e-01 7.88e-01 2.78e+00 3.26e+00   ph/cm2/s
              Error 5.79e-02 3.47e-02 2.28e-02 6.09e-02 9.46e-02 9.67e-02   ph/cm2/s
 
Fluence   Cutoff-PL 1.38e-06 2.30e-06 2.79e-06 5.55e-06 8.29e-06 1.18e-05   erg/cm2
              Error 1.18e-07 8.49e-08 9.05e-08 1.51e-06 3.02e-07 1.56e-06   erg/cm2
Peak flux Cutoff-PL 8.69e-01 9.18e-01 6.75e-01 7.64e-01 2.77e+00 3.21e+00   ph/cm2/s
              Error 7.18e-02 3.55e-02 2.02e-02 1.16e-01 9.75e-02 1.60e-01   ph/cm2/s
 
Fluence        Band 1.37e-06 2.30e-06 2.79e-06 5.53e-06 8.28e-06 1.18e-05   erg/cm2
              Error 1.17e-07 1.06e-07 1.21e-07 1.51e-06 3.04e-07 1.56e-06   erg/cm2
Peak flux      Band 8.75e-01 9.19e-01 6.70e-01 7.85e-01 2.77e+00 3.25e+00   ph/cm2/s
              Error 6.80e-02 3.79e-02 2.27e-02 1.18e-01 7.70e-02 1.14e-01   ph/cm2/s
 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.726    0.062    -      -           3.77e-03 1.15e-04   44.101 57
CPL   1.602    0.215     172.6 5000.0      4.30e-03 9.66e-04   43.320 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.451    0.059    -      -           2.25e-02 6.69e-04   51.023 57
CPL   1.392    0.159     593.3 5000.0      2.39e-02 4.05e-03   51.009  0
 
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: 38.080000 sec.
T50 in the 50-300 keV band: 18.560000 sec.
 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100  240.000  -95.344  144.656
T90   144.000  -63.344   80.656
T50    16.000    0.656   16.656
Peak    1.000    8.156    9.156

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
  236.4309  -3.6428 0.0061   31.2   95.0       8.7777    31.7  TRIG_00205851       
------------------------------------------
 
Foreground time interval of the image:
-95.344  15.661 (delta_t = 111.005 [sec])
Background time interval of the image:
-239.344 -95.344 (delta_t = 144.000 [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  -95.344 sec. to  144.656 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.72620     ( -6.222963E-02   6.244838E-02) )
Norm@50keV  : 3.770099E-03    ( -1.155201E-04   1.154274E-04) )
------------------------------------------------------------
 Chi-Squared =      44.10128     using    59 PHA bins.
 Reduced chi-squared =     0.7737066     for     57 degrees of freedom
 Null hypothesis probability = 0.894
 
Photon flux (15-150 keV)    in 240.0 sec: 0.505382 ( -0.017935  0.01805 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.36141e-06 ( -2.62512e-07  2.6316e-07 ) ergs/cm2
 
Cutoff power-law model
Time interval is from  -95.344 sec. to  144.656 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.60174     ( -0.254660   0.176144 )
Epeak [keV] : 172.564      ( -172.554 9827.44 )
Norm@50keV  : 4.304888E-03    ( -6.267009E-04   1.305082E-03) )
------------------------------------------------------------
 Chi-Squared =      43.32019     using    59 PHA bins.
 Reduced chi-squared =     0.7735748     for     56 degrees of freedom
 Null hypothesis probability = 0.892
 
Photon flux (15-150 keV)    in 240.0 sec: 0.499612 ( -0.020542  0.020598 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.28874e-06 ( -3.0588e-07  2.98896e-07 ) ergs/cm2
 
Band function
Time interval is from  -95.344 sec. to  144.656 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.37534   ( -8.62466   3.50116 )
beta        : -1.73746    ( -7.96586   0.360758 )
Epeak [keV] : 52.7873      ( -156.058 9843.84 )
Norm@50keV   : 6.485014E-03    ( -7.154467E-04   7.41412 )
------------------------------------------------------------
 Chi-Squared =      43.83020     using    59 PHA bins.
 Reduced chi-squared =     0.7969127     for     55 degrees of freedom
 Null hypothesis probability = 0.860
 
Photon flux (15-150 keV)    in 240.0 sec: 0.499637 ( -0.020752  0.020833 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.27777e-06 ( -3.03792e-07  3.04656e-07 ) ergs/cm2
 

Peak spectrum fit using the pre-slew DRM

Power-law model
Time interval is from    0.656 sec. to   16.656 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.45129     ( -5.855656E-02   5.847836E-02) )
Norm@50keV  : 2.252432E-02    ( -6.689075E-04   6.686747E-04) )
------------------------------------------------------------
 Chi-Squared =      51.02284     using    59 PHA bins.
 Reduced chi-squared =     0.8951376     for     57 degrees of freedom
 Null hypothesis probability = 0.698
 
Photon flux (15-150 keV)    in 16.00 sec: 2.77670 ( -0.09437  0.09481 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.4483e-06 ( -1.06464e-07  1.05744e-07 ) ergs/cm2
 
Cutoff power-law model
Time interval is from    0.656 sec. to   16.656 sec.
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.39227     ( -0.203772   0.114634 )
Epeak [keV] : 593.289      ( -593.279 9406.71 )
Norm@50keV  : 2.391337E-02    ( -2.833866E-03   5.273458E-03) )
------------------------------------------------------------
 Chi-Squared =      51.00862     using    59 PHA bins.
 but latest trial  2.262191E-02 gives Chi-Squared =  6.877899E-03
 Reduced chi-squared =     0.9108682     for     56 degrees of freedom
 Null hypothesis probability = 0.664
 
Photon flux (15-150 keV)    in 16.00 sec: 2.76966 ( -0.09681  0.09821 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.44851e-06 ( -1.06016e-07  1.06256e-07 ) ergs/cm2
 
Band function
Time interval is from    0.656 sec. to   16.656 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.945899   ( -9.05410   1.47619 )
beta        : -1.45544    ( -8.54456   6.124103E-02) )
Epeak [keV] : 50.9282      ( -50.8282 877.661 )
Norm@50keV   : 5.386234E-02    ( -3.198272E-02   96.9384 )
------------------------------------------------------------
 Chi-Squared =      50.90052     using    59 PHA bins.
 Reduced chi-squared =     0.9254639     for     55 degrees of freedom
 Null hypothesis probability = 0.632
 
Photon flux (15-150 keV)    in 16.00 sec: 2.76763 ( -0.05952  0.09449 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.44634e-06 ( -1.19808e-07  1.05296e-07 ) ergs/cm2
 
Plot creation:
Mon Dec 31 19:00:57 EST 2007