batgrbproduct Analysis for Trigger=312047

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.41
    Process Start Time (local time): Wed May 21 06:12:46 EDT 2008
             Host Name: gcn5
   Current Working Dir: /local/data/raid2/prebascript/trigger312047/GCN5_download_cron
======================================================================

  Trigger: 00312047      Segment: 000

  BAT Trigger Time: 233014827.584   [s; MET]
      Trigger Stop: 233014829.632   [s; MET]
               UTC: 2008-05-20T22:20:24.778640    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 280.191885316142   Dec: -55.003825646117  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.7
     Image Trigger?:     NO
     Rate S/N Ratio:     10.6301458127346  [ if not an image trigger ]
     Image S/N Ratio:    8.7

  Flight Position:   [ source = BAT ]
    RA: 280.191885316142   Dec: -55.003825646117  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 280.178888400121   Dec: -54.9642781569657  [deg; J2000]  
        { 18h 40m 42.9s , -54d 57' 51.4" }
         +/- 2.41476465599094 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.18546089198844 [arcmin] (formal 1-sigma fit error)
    SNR: 8.63285337756041
 
  Angular difference between Flight and Ground position is 2.414671 arcmin
 
  Partial Coding Fraction: 1    [ including projection effects ]

  Duration
     T90: 2.82400000095367 +/- 0.658401081811059
        Measured from: -0.135999977588654
                   to: 2.68800002336502     [s; relative to TRIGTIME]
     T50: 1.62799999117851 +/- 0.63449193880696
        Measured from: 0.256000012159348
                   to: 1.88400000333786     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.311999976634979     
                   to: 0.688000023365021     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.319999992847443     
                   to: 2.84800001978874     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.082066   0.050278   0.002742   0.008262
           0.010196   0.009480   0.008049   0.006948 [error]
 Peak      0.032300   0.023016   0.001827   0.001255
           0.005789   0.005374   0.004516   0.003875 [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 1.85e-08 9.89e-09 7.70e-09 5.52e-08 5.92e-08   erg/cm2
              Error 5.12e-09 4.99e-09 5.54e-09 9.33e-09 1.41e-08 1.83e-08   erg/cm2
Peak flux Power-law 2.50e-01 1.53e-01 6.05e-02 3.20e-02 4.80e-01 4.96e-01   ph/cm2/s
              Error 8.40e-02 4.49e-02 3.23e-02 3.70e-02 1.31e-01 1.37e-01   ph/cm2/s
 
Fluence   Cutoff-PL 2.30e-08 2.02e-08 7.22e-09 9.43e-10 5.12e-08 5.13e-08   erg/cm2
              Error 5.47e-09 6.21e-09 7.49e-09 8.09e-09 1.40e-08 1.83e-08   erg/cm2
Peak flux Cutoff-PL 2.30e-01 1.90e-01 4.36e-02 1.84e-03 4.65e-01 4.65e-01   ph/cm2/s
              Error 9.75e-02 6.56e-02 3.85e-02 2.58e-02 1.29e-01 1.29e-01   ph/cm2/s
 
Fluence        Band 2.28e-08 2.01e-08 7.14e-09 9.17e-10 5.10e-08 5.15e-08   erg/cm2
              Error 5.01e-09 4.61e-09 5.66e-09 6.66e-09 1.40e-08 1.04e-08   erg/cm2
Peak flux      Band 2.32e-01 1.88e-01 4.40e-02 2.05e-03 4.64e-01 4.71e-01   ph/cm2/s
              Error 7.68e-02 5.48e-02 2.24e-02 2.76e-02 1.27e-01 1.30e-01   ph/cm2/s
 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    2.903    0.511    -      -           1.51e-03 6.34e-04   53.609 57
CPL   1.742    1.450       7.1   13.1      9.21e-03 3.30e-01   52.781 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    2.343    0.548    -      -           2.68e-03 1.11e-03   49.170 57
CPL   0.418    2.495      28.7   21.0      4.65e-02 1.81e+00   47.264  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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100    3.168   -0.320    2.848
T90     2.824   -0.136    2.688
T50     1.628    0.256    1.884
Peak    1.000   -0.312    0.688

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
  280.1789 -54.9643 0.0224   17.4 -158.0       0.1514     8.6  TRIG_00312047       
------------------------------------------
 
Foreground time interval of the image:
 -0.320   2.848 (delta_t =   3.168 [sec])
Background time interval of the image:
-137.383  -0.320 (delta_t = 137.063 [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   -0.320 sec. to    2.848 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.90326     ( -0.459763   0.561391 )
Norm@50keV  : 1.512055E-03    ( -6.122050E-04   6.556122E-04) )
------------------------------------------------------------
 Chi-Squared =      53.60941     using    59 PHA bins.
 Reduced chi-squared =     0.9405159     for     57 degrees of freedom
 Null hypothesis probability = 0.603
 
Photon flux (15-150 keV)    in 3.168 sec: 0.387924 ( -0.075759  0.075846 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.51603e-08 ( -1.3503e-08  1.46453e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   -0.320 sec. to    2.848 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.74245     ( -2.64677   0.252306 )
Epeak [keV] : 7.05623      ( -7.04623 19.0774 )
Norm@50keV  : 9.214663E-03    ( -9.214663E-03   0.651726 )
------------------------------------------------------------
 Chi-Squared =      52.78111     using    59 PHA bins.
 Reduced chi-squared =     0.9425197     for     56 degrees of freedom
 Null hypothesis probability = 0.597
 
Photon flux (15-150 keV)    in 3.168 sec: 0.382021 ( -0.074817  0.074621 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.12288e-08 ( -1.22228e-08  1.58318e-08 ) ergs/cm2
 
Band function
Time interval is from   -0.320 sec. to    2.848 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.41929   ( -8.58071   0.569833 )
beta        : -8.86649    ( -1.13351   18.8664 )
Epeak [keV] : 12.4697      ( -12.3697 7.62151 )
Norm@50keV   : 1.511374E-02    ( -1.511374E-02   0.664361 )
------------------------------------------------------------
 Chi-Squared =      52.86067     using    59 PHA bins.
 Reduced chi-squared =     0.9611031     for     55 degrees of freedom
 Null hypothesis probability = 0.557
 
Photon flux (15-150 keV)    in 3.168 sec: 0.393057 ( -0.076342  0.075972 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.10365e-08 ( -1.18771e-08  1.60627e-08 ) ergs/cm2
 

Peak spectrum fit using the pre-slew DRM

Power-law model
Time interval is from   -0.312 sec. to    0.688 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.34329     ( -0.498847   0.597657 )
Norm@50keV  : 2.681711E-03    ( -1.109388E-03   1.106901E-03) )
------------------------------------------------------------
 Chi-Squared =      49.17048     using    59 PHA bins.
 Reduced chi-squared =     0.8626400     for     57 degrees of freedom
 Null hypothesis probability = 0.760
 
Photon flux (15-150 keV)    in 1.000 sec: 0.480216 ( -0.130754  0.130834 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.58344e-08 ( -8.4613e-09  9.1932e-09 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   -0.312 sec. to    0.688 sec.
Epeak [keV] : 28.6708      ( -26.8436 15.1525 )
Norm@50keV  : 4.646519E-02    ( -4.646520E-02   3.57070 )
------------------------------------------------------------
 Chi-Squared =      47.26403     using    59 PHA bins.
 but latest trial   2.01716     gives Chi-Squared =   3.12165
 but latest trial   1.83272     gives Chi-Squared =   1.15102
 but latest trial   56.9301     gives Chi-Squared =   3.13401
 but latest trial   5.81522     gives Chi-Squared =   8.52339
 Reduced chi-squared =     0.8440005     for     56 degrees of freedom
 Null hypothesis probability = 0.791
 
Photon flux (15-150 keV)    in 1.000 sec: 0.465138 ( -0.127912  0.129442 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.23262e-08 ( -6.7147e-09  9.1761e-09 ) ergs/cm2
 
Band function
Time interval is from   -0.312 sec. to    0.688 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.774366   ( -9.22563   4.95452 )
beta        : -9.31674    (     )
Epeak [keV] : 27.6969      (   )
Norm@50keV   : 2.730032E-02    (     )
------------------------------------------------------------
 Chi-Squared =      47.35740     using    59 PHA bins.
 Reduced chi-squared =     0.8610437     for     55 degrees of freedom
 Null hypothesis probability = 0.758
 
Photon flux (15-150 keV)    in 1.000 sec: 0.464307 ( -0.126756  0.128188 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.21527e-08 ( -6.7518e-09  9.7279e-09 ) ergs/cm2
 
Plot creation:
Wed May 21 07:11:05 EDT 2008