batgrbproduct Analysis for Trigger=338895

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.42
    Process Start Time (local time): Fri Jan  2 15:49:18 EST 2009
             Host Name: gcn5
   Current Working Dir: /local/data/raid2/prebascript/trigger338895/GCN5_download_cron
======================================================================

  Trigger: 00338895      Segment: 000

  BAT Trigger Time: 252557749.248   [s; MET]
      Trigger Stop: 252557751.296   [s; MET]
               UTC: 2009-01-02T02:55:45.865380    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 128.258919212618   Dec: 33.0915130874167  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    9.37
     Image Trigger?:     NO
     Rate S/N Ratio:     77.517739905134  [ if not an image trigger ]
     Image S/N Ratio:    9.37

  Flight Position:   [ source = BAT ]
    RA: 128.258919212618   Dec: 33.0915130874167  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 128.247748108269   Dec: 33.1071512162273  [deg; J2000]  
        { 08h 32m 59.5s , +33d 06' 25.7" }
         +/- 1.37912866808242 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.566911347789262 [arcmin] (formal 1-sigma fit error)
    SNR: 19.2168841068716
 
  Angular difference between Flight and Ground position is 1.093465 arcmin
 
  Partial Coding Fraction: 0.06835938    [ including projection effects ]

  Duration
     T90: 27.039999961853 +/- 2.24000000357628
        Measured from: -11.5679998993874
                   to: 15.4720000624657     [s; relative to TRIGTIME]
     T50: 11.2479999661446 +/- 1.63709010130248
        Measured from: -6.54399991035461
                   to: 4.70400005578995     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 1.68400001525879     
                   to: 2.68400001525879     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -13.9039999842644     
                   to: 18.6560000181198     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.999959   3.350491   3.035781   1.301617
           0.136760   0.146718   0.140554   0.116832 [error]
 Peak      0.082198   0.256630   0.269128   0.130070
           0.024365   0.031833   0.033770   0.029659 [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 7.84e-07 1.57e-06 2.44e-06 8.36e-06 6.80e-06 1.24e-05   erg/cm2
              Error 7.22e-08 8.56e-08 1.39e-07 1.07e-06 3.47e-07 0.00e+00   erg/cm2
Peak flux Power-law 1.25e+00 1.68e+00 1.65e+00 2.91e+00 5.53e+00 7.49e+00   ph/cm2/s
              Error 3.29e-01 2.79e-01 2.51e-01 8.99e-01 7.88e-01 1.15e+00   ph/cm2/s
 
Fluence   Cutoff-PL 7.59e-07 1.58e-06 2.48e-06 6.90e-06 6.76e-06 9.48e-06   erg/cm2
              Error 8.95e-08 9.28e-08 1.61e-07 2.40e-06 3.62e-07 0.00e+00   erg/cm2
Peak flux Cutoff-PL 9.44e-01 1.82e+00 1.90e+00 1.11e+00 5.38e+00 5.78e+00   ph/cm2/s
              Error 3.84e-01 3.35e-01 3.32e-01 9.52e-01 7.97e-01 1.20e+00   ph/cm2/s
 
Fluence        Band 7.48e-07 1.58e-06 2.47e-06 6.81e-06 6.75e-06 1.02e-05   erg/cm2
              Error 8.86e-08 7.10e-08 1.61e-07 2.41e-06 3.65e-07 0.00e+00   erg/cm2
Peak flux      Band 9.43e-01 1.82e+00 1.90e+00 1.11e+00 5.38e+00 5.77e+00   ph/cm2/s
              Error 3.84e-01 3.35e-01 2.52e-01 9.13e-01 7.97e-01 1.20e+00   ph/cm2/s
 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.360    0.085    -      -           2.14e-02 1.02e-03   47.644 57
CPL   1.233    0.280     335.1 5000.0      2.45e-02 7.53e-03   47.075 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.024    0.221    -      -           4.80e-02 6.74e-03   61.240 57
CPL  -0.181    1.126     101.3  105.8      1.72e-01 2.83e-01   56.693 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: 19.264000 sec.
T50 in the 50-300 keV band: 9.152000 sec.
 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   32.560  -13.904   18.656
T90    27.040  -11.568   15.472
T50    11.248   -6.544    4.704
Peak    1.000    1.684    2.684

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
  128.2477 +33.1072 0.0101   45.2   46.2      10.3329    19.2  TRIG_00338895       
------------------------------------------
 
Foreground time interval of the image:
-13.904  18.656 (delta_t =  32.560 [sec])
Background time interval of the image:
-239.248 -105.018 (delta_t = 134.230 [sec])
-104.248 -13.904 (delta_t =  90.344 [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  -13.904 sec. to   18.656 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.36028     ( -8.499789E-02   8.491564E-02) )
Norm@50keV  : 2.144414E-02    ( -1.016805E-03   1.016801E-03) )
------------------------------------------------------------
 Chi-Squared =      47.64369     using    59 PHA bins.
 Reduced chi-squared =     0.8358542     for     57 degrees of freedom
 Null hypothesis probability = 0.807
 
Photon flux (15-150 keV)    in 32.56 sec: 2.58893 ( -0.13076  0.13106 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.80374e-06 ( -3.46862e-07  3.47871e-07 ) ergs/cm2
 
Cutoff power-law model
Time interval is from  -13.904 sec. to   18.656 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.23296     ( -0.360646   0.200130 )
Epeak [keV] : 335.121      ( -335.111 9664.88 )
Norm@50keV  : 2.454829E-02    ( -3.934387E-03   1.112470E-02) )
------------------------------------------------------------
 Chi-Squared =      47.07537     using    59 PHA bins.
 Reduced chi-squared =     0.8406317     for     56 degrees of freedom
 Null hypothesis probability = 0.796
 
Photon flux (15-150 keV)    in 32.56 sec: 2.56927 ( -0.06884  0.06785 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.75793e-06 ( -3.65779e-07  3.58909e-07 ) ergs/cm2
 
Band function
Time interval is from  -13.904 sec. to   18.656 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.881965   ( -9.11803   2.68487 )
beta        : -1.45179    ( -8.54821   0.156858 )
Epeak [keV] : 99.7777      ( -99.6777 9900.22 )
Norm@50keV   : 3.900686E-02    ( -1.834549E-02   0.128982 )
------------------------------------------------------------
 Chi-Squared =      46.53891     using    59 PHA bins.
 Reduced chi-squared =     0.8461621     for     55 degrees of freedom
 Null hypothesis probability = 0.785
 
Photon flux (15-150 keV)    in 32.56 sec: 2.55282 ( -0.14144  0.14217 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.75164e-06 ( -3.65746e-07  3.65226e-07 ) ergs/cm2
 

Peak spectrum fit using the pre-slew DRM

Power-law model
Time interval is from    1.680 sec. to    2.688 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.02427     ( -0.223391   0.219358 )
Norm@50keV  : 4.799188E-02    ( -6.740797E-03   6.732374E-03) )
------------------------------------------------------------
 Chi-Squared =      61.23987     using    59 PHA bins.
 Reduced chi-squared =      1.074384     for     57 degrees of freedom
 Null hypothesis probability = 0.326
 
Photon flux (15-150 keV)    in 1.008 sec: 5.53340 ( -0.78766  0.78855 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.1823e-07 ( -7.82127e-08  7.96693e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from    1.680 sec. to    2.688 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.180822     ( -1.26805   0.983720 )
Epeak [keV] : 101.287      ( -27.7834 183.844 )
Norm@50keV  : 0.171571    ( -0.109534   0.456084 )
------------------------------------------------------------
 Chi-Squared =      56.69275     using    59 PHA bins.
 Reduced chi-squared =      1.012370     for     56 degrees of freedom
 Null hypothesis probability = 0.449
 
Photon flux (15-150 keV)    in 1.008 sec: 5.38020 ( -0.79602  0.79828 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.95816e-07 ( -8.45198e-08  8.44633e-08 ) ergs/cm2
 
Band function
Time interval is from    1.680 sec. to    2.688 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 0.183834   ( -0.986740   1.26247 )
beta        : -9.20960    ( -8.43679   0.532363 )
Epeak [keV] : 101.144      ( -18.0881 171.379 )
Norm@50keV   : 0.172156    ( -0.819473   96.4568 )
------------------------------------------------------------
 Chi-Squared =      56.69268     using    59 PHA bins.
 Reduced chi-squared =      1.030776     for     55 degrees of freedom
 Null hypothesis probability = 0.412
 
Photon flux (15-150 keV)    in 1.008 sec: 5.37971 ( -0.79528  0.79899 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.97814e-07 ( -8.09595e-08  8.1773e-08 ) ergs/cm2
 
Plot creation:
Fri Jan  2 16:19:38 EST 2009