batgrbproduct Analysis for Trigger=321551

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.41
    Process Start Time (local time): Sat Aug 23 23:07:45 EDT 2008
             Host Name: gcn5
   Current Working Dir: /local/data/raid2/prebascript/trigger321551/GCN5_download_cron
======================================================================

  Trigger: 00321551      Segment: 000

  BAT Trigger Time: 241183658.148   [s; MET]
      Trigger Stop: 241183658.164   [s; MET]
               UTC: 2008-08-23T11:27:35.107080    [includes UTCF correction] 
       Where From?: (*SHORT BURST*) TDRSS scaled map message

  BAT 
    RA: 75.264742049925   Dec: 45.2810981393975  [deg; J2000]

     Catalogged Source?: YES
     Point Source?:      YES
     GRB Indicated?:     NO    [ by BAT flight software ]
     Image S/N Ratio:    21.36
     Image Trigger?:     NO
     Rate S/N Ratio:     255.998046867549  [ if not an image trigger ]
     Image S/N Ratio:    21.36

  Flight Position:   [ source = BAT ]
    RA: 75.264742049925   Dec: 45.2810981393975  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 75.2749583079764   Dec: 45.2729800828829  [deg; J2000]  
        { 05h 01m 06.0s , +45d 16' 22.7" }
         +/- 0.391249276011093 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.100397114110427 [arcmin] (formal 1-sigma fit error)
    SNR: 116.232505273885
 
  Angular difference between Flight and Ground position is 0.650617 arcmin
 
  Partial Coding Fraction: 1.015625    [ including projection effects ]

  Duration
     T90: 0.260000020265579 +/- 0.00799998641014099
        Measured from: -0.0919999182224274
                   to: 0.168000102043152     [s; relative to TRIGTIME]
     T50: 0.159999996423721 +/- 0.004
        Measured from: -0.0559999048709869
                   to: 0.104000091552734     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.314000010490417     
                   to: 0.685999989509583     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.164000004529953     
                   to: 0.532000005245209     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     3.230281   3.120982   0.766242   0.018846
           0.022929   0.022399   0.011790   0.003815 [error]
 Peak      3.230541   3.121155   0.766185   0.018702
           0.022932   0.022403   0.011793   0.003818 [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 1.50e-06 1.08e-06 5.15e-07 3.45e-07 3.27e-06 3.43e-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 7.17e+01 2.90e+01 6.91e+00 1.99e+00 1.09e+02 1.10e+02   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 8.04e-07 1.29e-06 5.77e-07 5.67e-08 2.85e-06 2.53e-06   erg/cm2
              Error 2.65e-08 1.55e-08 7.66e-09 6.70e-08 0.00e+00 0.00e+00   erg/cm2
Peak flux Cutoff-PL 4.30e+01 3.36e+01 8.04e+00 4.30e-01 8.51e+01 8.51e+01   ph/cm2/s
              Error 2.43e+00 7.01e-01 2.05e-01 5.48e-02 2.76e+00 2.76e+00   ph/cm2/s
 
Fluence        Band 9.39e-07 1.28e-06 5.77e-07 5.97e-08 2.86e-06 2.84e-06   erg/cm2
              Error 2.42e-08 1.51e-08 2.36e-08 5.56e-08 0.00e+00 0.00e+00   erg/cm2
Peak flux      Band 4.42e+01 3.35e+01 8.03e+00 4.59e-01 8.61e+01 8.61e+01   ph/cm2/s
              Error 2.44e+00 6.39e-01 1.93e-01 1.83e-01 1.80e+00 3.22e+00   ph/cm2/s
 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    3.072    0.000    -      -           3.78e-01 0.00e+00  755.858 57
CPL   0.504    0.206      27.8    1.7      7.74e+00 1.89e+00   42.320 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    3.072    0.000    -      -           3.76e-01 0.00e+00  756.523 57
CPL   0.501    0.207      27.8    1.7      7.73e+00 1.89e+00   42.011 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: 0.256000 sec.
T50 in the 50-300 keV band: 0.192000 sec.
 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100    0.696   -0.164    0.532
T90     0.260   -0.092    0.168
T50     0.160   -0.056    0.104
Peak    1.000   -0.314    0.686

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
   75.2750 +45.2730 0.0017    0.0 -105.5       7.1460   116.2  TRIG_00321551       
------------------------------------------
 
Foreground time interval of the image:
 -0.164   0.532 (delta_t =   0.696 [sec])
Background time interval of the image:
-119.148  -0.164 (delta_t = 118.984 [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   -0.164 sec. to    0.532 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 3.07188     (     )
Norm@50keV  : 0.377774    (     )
------------------------------------------------------------
 Chi-Squared =      755.8582     using    59 PHA bins.
 Reduced chi-squared =      13.26067     for     57 degrees of freedom
 Null hypothesis probability =  0.00
 
Photon flux (15-150 keV)    in 0.6960 sec: 109.512 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.26814e-06 ( 0  0 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   -0.164 sec. to    0.532 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.504289     ( -0.210748   0.202199 )
Epeak [keV] : 27.8236      ( -1.74963 1.56566 )
Norm@50keV  : 7.73919    ( -1.62177   2.15609 )
------------------------------------------------------------
 Chi-Squared =      42.32048     using    59 PHA bins.
 Reduced chi-squared =     0.7557229     for     56 degrees of freedom
 Null hypothesis probability = 0.912
 
Photon flux (15-150 keV)    in 0.6960 sec: 85.5628 ( -2.7532  2.7923 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.84913e-06 ( -6.6633e-08  6.72802e-08 ) ergs/cm2
 
Band function
Time interval is from   -0.164 sec. to    0.532 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.26140   ( -0.107452   0.405686 )
beta        : -9.37163    ( -4.90123   15.0985 )
Epeak [keV] : 19.8641      ( -2.51418 1.19064 )
Norm@50keV   : 3.15202    ( -2.62417   5.89978 )
------------------------------------------------------------
 Chi-Squared =      86.48078     using    59 PHA bins.
 Reduced chi-squared =      1.572378     for     55 degrees of freedom
 Null hypothesis probability = 4.297E-03
 
Photon flux (15-150 keV)    in 0.6960 sec: 86.3814 ( -2.2518  2.2198 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.85624e-06 ( -5.22202e-08  5.88809e-08 ) ergs/cm2
 

Peak spectrum fit using the pre-slew DRM

Power-law model
Time interval is from   -0.164 sec. to    0.536 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 3.07211     (     )
Norm@50keV  : 0.375581    (     )
------------------------------------------------------------
 Chi-Squared =      756.5225     using    59 PHA bins.
 Reduced chi-squared =      13.27232     for     57 degrees of freedom
 Null hypothesis probability =  0.00
 
Photon flux (15-150 keV)    in 0.7000 sec: 108.901 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.26822e-06 ( 0  0 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   -0.164 sec. to    0.536 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.500872     ( -0.210538   0.202733 )
Epeak [keV] : 27.8428      ( -1.74959 1.56034 )
Norm@50keV  : 7.72942    ( -1.62356   2.15133 )
------------------------------------------------------------
 Chi-Squared =      42.01093     using    59 PHA bins.
 Reduced chi-squared =     0.7501952     for     56 degrees of freedom
 Null hypothesis probability = 0.917
 
Photon flux (15-150 keV)    in 0.7000 sec: 85.0599 ( -2.7371  2.7771 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.84872e-06 ( -6.66176e-08  6.73078e-08 ) ergs/cm2
 
Band function
Time interval is from   -0.164 sec. to    0.536 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.26181   ( -0.269982   0.186014 )
beta        : -9.09107    ( -5.09061   14.9092 )
Epeak [keV] : 19.8606      ( -1.98465 1.60611 )
Norm@50keV   : 3.13997    ( -3.18529   5.11199 )
------------------------------------------------------------
 Chi-Squared =      86.54496     using    59 PHA bins.
 Reduced chi-squared =      1.573545     for     55 degrees of freedom
 Null hypothesis probability = 4.240E-03
 
Photon flux (15-150 keV)    in 0.7000 sec: 86.1345 ( -1.5479  2.0621 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.85878e-06 ( -5.48814e-08  5.4586e-08 ) ergs/cm2
 
Plot creation:
Sat Aug 23 23:16:25 EDT 2008