batgrbproduct Analysis for Trigger=321481

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.41
    Process Start Time (local time): Sat Aug 23 17:51:12 EDT 2008
             Host Name: gcn5
   Current Working Dir: /local/data/raid2/prebascript/trigger321481/GCN5_download_cron
======================================================================

  Trigger: 00321481      Segment: 000

  BAT Trigger Time: 241159671.64   [s; MET]
      Trigger Stop: 241159671.656   [s; MET]
               UTC: 2008-08-23T04:47:48.599800    [includes UTCF correction] 
       Where From?: (*SHORT BURST*) TDRSS scaled map message

  BAT 
    RA: 75.2703524009689   Dec: 45.278018692367  [deg; J2000]

     Catalogged Source?: YES
     Point Source?:      YES
     GRB Indicated?:     NO    [ by BAT flight software ]
     Image S/N Ratio:    24.4
     Image Trigger?:     NO
     Rate S/N Ratio:     255.998046867549  [ if not an image trigger ]
     Image S/N Ratio:    24.4

  Flight Position:   [ source = BAT ]
    RA: 75.2703524009689   Dec: 45.278018692367  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 75.2764024988385   Dec: 45.2725594512674  [deg; J2000]  
        { 05h 01m 06.3s , +45d 16' 21.2" }
         +/- 0.431402087600575 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.098125458672936 [arcmin] (formal 1-sigma fit error)
    SNR: 101.091624749558
 
  Angular difference between Flight and Ground position is 0.415386 arcmin
 
  Partial Coding Fraction: 1.015625    [ including projection effects ]

  Duration
     T90: 0.708000004291534 +/- 0.0126491268505387
        Measured from: -0.0119999051094055
                   to: 0.696000099182129     [s; relative to TRIGTIME]
     T50: 0.0879999995231628 +/- 0.0160000026226044
        Measured from: 0.00400009751319885
                   to: 0.0920000970363617     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.0759999752044678     
                   to: 0.924000024795532     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.0599999725818634     
                   to: 0.904000014066696     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.605612   1.450156   0.380357   0.004141
           0.016744   0.015991   0.009658   0.006492 [error]
 Peak      1.605822   1.450241   0.380596   0.004371
           0.016750   0.015995   0.009666   0.006504 [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 6.36e-07 5.26e-07 2.95e-07 2.45e-07 1.57e-06 1.70e-06   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 Power-law 2.18e+01 1.01e+01 2.84e+00 9.98e-01 3.53e+01 3.58e+01   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
 
Fluence   Cutoff-PL 4.52e-07 5.99e-07 2.82e-07 3.59e-08 1.37e-06 1.35e-06   erg/cm2
              Error 1.49e-08 1.22e-08 8.06e-09 3.95e-08 0.00e+00 0.00e+00   erg/cm2
Peak flux Cutoff-PL 1.54e+01 1.13e+01 2.83e+00 1.95e-01 2.98e+01 2.98e+01   ph/cm2/s
              Error 9.99e-01 2.81e-01 1.11e-01 4.09e-02 1.11e+00 1.11e+00   ph/cm2/s
 
Fluence        Band 4.62e-07 5.99e-07 2.77e-07 6.05e-08 1.37e-06 1.56e-06   erg/cm2
              Error 1.32e-08 8.93e-09 1.90e-08 3.26e-08 0.00e+00 0.00e+00   erg/cm2
Peak flux      Band 1.56e+01 1.13e+01 2.83e+00 2.93e-01 2.97e+01 3.11e+01   ph/cm2/s
              Error 4.72e-01 2.76e-01 8.18e-02 5.69e-02 1.13e+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    2.833    0.000    -      -           1.45e-01 0.00e+00  270.798 57
CPL   0.837    0.272      25.6    2.6      1.71e+00 5.87e-01   41.093 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    2.832    0.000    -      -           1.45e-01 0.00e+00  270.377 57
CPL   0.841    0.271      25.6    2.6      1.70e+00 5.81e-01   41.618 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: 0.768000 sec.
T50 in the 50-300 keV band: 0.384000 sec.
 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100    0.964   -0.060    0.904
T90     0.708   -0.012    0.696
T50     0.088    0.004    0.092
Peak    1.000   -0.076    0.924

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
   75.2764 +45.2726 0.0019    0.0   60.3       3.4237   101.1  TRIG_00321481       
------------------------------------------
 
Foreground time interval of the image:
 -0.060   0.904 (delta_t =   0.964 [sec])
Background time interval of the image:
-119.640 -56.621 (delta_t =  63.019 [sec])
-55.640  -0.060 (delta_t =  55.580 [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   -0.060 sec. to    0.904 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.83302     (     )
Norm@50keV  : 0.145304    (     )
------------------------------------------------------------
 Chi-Squared =      270.7980     using    59 PHA bins.
 Reduced chi-squared =      4.750842     for     57 degrees of freedom
 Null hypothesis probability = 1.430E-29
 
Photon flux (15-150 keV)    in 0.9640 sec: 35.4902 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.56632e-06 ( 0  0 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   -0.060 sec. to    0.904 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.836663     ( -0.278616   0.264665 )
Epeak [keV] : 25.6338      ( -2.90549 2.37116 )
Norm@50keV  : 1.71184    ( -0.474395   0.700057 )
------------------------------------------------------------
 Chi-Squared =      41.09258     using    59 PHA bins.
 Reduced chi-squared =     0.7337961     for     56 degrees of freedom
 Null hypothesis probability = 0.932
 
Photon flux (15-150 keV)    in 0.9640 sec: 29.8710 ( -1.1078  1.1216 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.37373e-06 ( -3.92531e-08  3.9792e-08 ) ergs/cm2
 
Band function
Time interval is from   -0.060 sec. to    0.904 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.30681   ( -0.309299   0.269364 )
beta        : -9.16770    ( -5.45772   0.525171 )
Epeak [keV] : 20.1143      ( -3.49032 1.99981 )
Norm@50keV   : 0.959433    ( -0.801327   0.912237 )
------------------------------------------------------------
 Chi-Squared =      50.14321     using    59 PHA bins.
 Reduced chi-squared =     0.9116948     for     55 degrees of freedom
 Null hypothesis probability = 0.660
 
Photon flux (15-150 keV)    in 0.9640 sec: 29.7662 ( -1.1181  1.1486 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.37079e-06 ( -3.52679e-08  2.98917e-08 ) ergs/cm2
 

Peak spectrum fit using the pre-slew DRM

Power-law model
Time interval is from   -0.060 sec. to    0.908 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.83219     (     )
Norm@50keV  : 0.144789    (     )
------------------------------------------------------------
 Chi-Squared =      270.3770     using    59 PHA bins.
 Reduced chi-squared =      4.743455     for     57 degrees of freedom
 Null hypothesis probability = 1.692E-29
 
Photon flux (15-150 keV)    in 0.9680 sec: 35.3437 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.56673e-06 ( 0  0 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   -0.060 sec. to    0.908 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.840740     ( -0.278515   0.264451 )
Epeak [keV] : 25.6083      ( -2.91500 2.37868 )
Norm@50keV  : 1.69536    ( -0.469529   0.693008 )
------------------------------------------------------------
 Chi-Squared =      41.61842     using    59 PHA bins.
 Reduced chi-squared =     0.7431861     for     56 degrees of freedom
 Null hypothesis probability = 0.924
 
Photon flux (15-150 keV)    in 0.9680 sec: 29.7588 ( -1.1027  1.118 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.37441e-06 ( -3.92902e-08  3.97964e-08 ) ergs/cm2
 
Band function
Time interval is from   -0.060 sec. to    0.908 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.30672   ( -0.191045   0.302912 )
beta        : -9.20854    (     )
Epeak [keV] : 20.1293      (   )
Norm@50keV   : 0.954923    (     )
------------------------------------------------------------
 Chi-Squared =      50.51973     using    59 PHA bins.
 Reduced chi-squared =     0.9185405     for     55 degrees of freedom
 Null hypothesis probability = 0.646
 
Photon flux (15-150 keV)    in 0.9680 sec: 29.6634 ( -1.1257  1.1327 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.37522e-06 ( -3.30514e-08  3.39845e-08 ) ergs/cm2
 
Plot creation:
Sat Aug 23 18:05:03 EDT 2008