batgrbproduct Analysis for Trigger=156220

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.41
    Process Start Time (local time): Wed Jan  9 12:30:58 EST 2008
             Host Name: gcn5
   Current Working Dir: /local/data/raid2/prebascript/trigger156220/GCN5_download_cron
======================================================================

  Trigger: 00156220      Segment: 000

  BAT Trigger Time: 148954128   [s; MET]
      Trigger Stop: 148954192   [s; MET]
               UTC: 2005-09-21T00:08:48.259940    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 276.421809386395   Dec: -37.0337167372723  [deg; J2000]

     Catalogged Source?: YES
     Point Source?:      YES
     GRB Indicated?:     NO    [ by BAT flight software ]
     Image S/N Ratio:    33300
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    33300

  Flight Position:   [ source = BAT ]
    RA: 276.421809386395   Dec: -37.0337167372723  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 276.497439639522   Dec: -37.0181383499784  [deg; J2000]  
        { 18h 25m 59.4s , -37d 01' 05.3" }
         +/- 3.98871170716685 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.99970650308553 [arcmin] (formal 1-sigma fit error)
    SNR: 4.21488787441603
    RA  =  18h 25m 59.4s  (276.497440 deg.)
    Dec = -37d  1'  5" (-37.018138 deg.)
 
  Angular difference between Flight and Ground position is 3.741460 arcmin
 
  Partial Coding Fraction: 0.9765625    [ including projection effects ]

  Duration
     T90: 64 +/- 
        Measured from: 0
                   to: 64     [s; relative to TRIGTIME]
     T50: 64 +/- 
        Measured from: 0
                   to: 64     [s; relative to TRIGTIME]

    WARNING: battblocks failed.  Used TDRSS fore/background intervals

  Fluence
     Peak Flux  (peak 64 second)
        Measured from: 0     
                   to: 64     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 0     
                   to: 64     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.072787   0.087876   0.011371   0.008294
           0.031579   0.028728   0.025096   0.021836 [error]
 Peak      0.072787   0.087876   0.011371   0.008294
           0.031579   0.028728   0.025096   0.021836 [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 2.33e-08 2.52e-08 1.94e-08 2.44e-08 7.70e-08 9.34e-08   erg/cm2
              Error 1.32e-08 1.35e-08 2.06e-08 5.46e-08 4.60e-08 7.97e-08   erg/cm2
Peak flux Power-law 2.39e-02 1.44e-02 5.54e-03 2.85e-03 4.53e-02 4.67e-02   ph/cm2/s
              Error 1.38e-02 1.09e-02 5.73e-03 5.73e-03 2.16e-02 2.26e-02   ph/cm2/s
 
Fluence   Cutoff-PL 2.34e-08 3.25e-08 4.19e-09 1.02e-11 6.01e-08 6.01e-08   erg/cm2
              Error 1.24e-08 1.68e-08 1.55e-08 2.78e-08 3.45e-08 5.19e-08   erg/cm2
Peak flux Cutoff-PL 2.31e-02 1.92e-02 1.42e-03 1.91e-06 4.37e-02 4.37e-02   ph/cm2/s
              Error 1.27e-02 1.01e-02 4.42e-03 1.55e-03 1.93e-02 1.93e-02   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    2.378    1.043    -      -           2.48e-04 2.16e-04   57.658 57
CPL  -2.499    0.000      27.8    9.5      5.85e-01 3.45e+00   55.668 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    2.378    1.043    -      -           2.48e-04 2.16e-04   57.658 57
CPL  -2.499    0.000      27.8    9.5      5.85e-01 3.45e+00   55.668 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   64.000    0.000   64.000
T90    64.000    0.000   64.000
T50    64.000    0.000   64.000
Peak   64.000    0.000   64.000

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
  276.4974 -37.0181 0.0453   13.9  148.2       0.2464     4.2  TRIG_00156220       
------------------------------------------
 
Foreground time interval of the image:
  0.000  22.952 (delta_t =  22.952 [sec])
 24.000  33.060 (delta_t =   9.060 [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
0.000000 22.951700
24.000000 33.060500
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.37785     ( -0.885592   1.20101 )
Norm@50keV  : 2.479654E-04    ( -2.479654E-04   1.836147E-04) )
------------------------------------------------------------
 Chi-Squared =      57.65828     using    59 PHA bins.
 Reduced chi-squared =      1.011549     for     57 degrees of freedom
 Null hypothesis probability = 0.451
 
Photon flux (15-150 keV)    in 32.01 sec: 4.529315E-02 ( -0.0215404  0.0216024 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.70292e-08 ( -4.20861e-08  4.9902e-08 ) ergs/cm2
 
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
0.000000 22.951700
24.000000 33.060500
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.49912     (     )
Epeak [keV] : 27.7644      ( -7.66107 11.4122 )
Norm@50keV  : 0.585093    ( -1.13256   5.75825 )
------------------------------------------------------------
 Chi-Squared =      55.66817     using    59 PHA bins.
 Reduced chi-squared =     0.9940745     for     56 degrees of freedom
 Null hypothesis probability = 0.487
 
Photon flux (15-150 keV)    in 32.01 sec: 4.368290E-02 ( -0.019245  0.0193426 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.00671e-08 ( -2.73401e-08  4.16287e-08 ) ergs/cm2
 
Band function
Multiple GTIs in the spectrum
tstart tstop
0.000000 22.951700
24.000000 33.060500
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.36807   ( -8.63193   5.82945 )
beta        : -9.14139    (     )
Epeak [keV] : 19.0450      (   )
Norm@50keV   : 1.280062E-03    (     )
------------------------------------------------------------
 Chi-Squared =      56.96318     using    59 PHA bins.
 Reduced chi-squared =      1.035694     for     55 degrees of freedom
 Null hypothesis probability = 0.402
 
Photon flux (15-150 keV)    in 32.01 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2
 

Peak spectrum fit using the pre-slew DRM

Power-law model
Time interval is from   24.000 sec. to   33.060 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.37785     ( -0.885592   1.20101 )
Norm@50keV  : 2.479654E-04    ( -2.479654E-04   1.836147E-04) )
------------------------------------------------------------
 Chi-Squared =      57.65828     using    59 PHA bins.
 Reduced chi-squared =      1.011549     for     57 degrees of freedom
 Null hypothesis probability = 0.451
 
Photon flux (15-150 keV)    in 32.01 sec: 4.529315E-02 ( -0.0215404  0.0216024 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.70292e-08 ( -4.20861e-08  4.9902e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   24.000 sec. to   33.060 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.49912     (     )
Epeak [keV] : 27.7644      ( -7.66107 11.4122 )
Norm@50keV  : 0.585093    ( -1.13256   5.75825 )
------------------------------------------------------------
 Chi-Squared =      55.66817     using    59 PHA bins.
 Reduced chi-squared =     0.9940745     for     56 degrees of freedom
 Null hypothesis probability = 0.487
 
Photon flux (15-150 keV)    in 32.01 sec: 4.368290E-02 ( -0.019245  0.0193426 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.00671e-08 ( -2.73401e-08  4.16287e-08 ) ergs/cm2
 
Band function
Time interval is from   24.000 sec. to   33.060 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.36807   ( -8.63193   5.82945 )
beta        : -9.14139    (     )
Epeak [keV] : 19.0450      (   )
Norm@50keV   : 1.280062E-03    (     )
------------------------------------------------------------
 Chi-Squared =      56.96318     using    59 PHA bins.
 Reduced chi-squared =      1.035694     for     55 degrees of freedom
 Null hypothesis probability = 0.402
 
Photon flux (15-150 keV)    in 32.01 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2
 
Plot creation:
Wed Jan  9 12:53:10 EST 2008