batgrbproduct Analysis for Trigger=276321

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.41
    Process Start Time (local time): Thu Dec 13 18:34:10 EST 2007
             Host Name: gcn5
   Current Working Dir: /local/data/raid2/prebascript/trigger276321/GCN5_download_cron
======================================================================

  Trigger: 00276321      Segment: 000

  BAT Trigger Time: 198742695.424   [s; MET]
      Trigger Stop: 198742697.472   [s; MET]
               UTC: 2007-04-20T06:18:13.522060    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 121.252999205293   Dec: -45.5608340567608  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    10.94
     Image Trigger?:     NO
     Rate S/N Ratio:     23.9374184071716  [ if not an image trigger ]
     Image S/N Ratio:    10.94

  Flight Position:   [ source = BAT ]
    RA: 121.252999205293   Dec: -45.5608340567608  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 121.245746121695   Dec: -45.5632127683013  [deg; J2000]  
        { 08h 04m 59.0s , -45d 33' 47.6" }
         +/- 0.975760764474733 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.397771094181992 [arcmin] (formal 1-sigma fit error)
    SNR: 31.5022928303515
    RA  =   8h  4m 59.0s  (121.245746 deg.)
    Dec = -45d 33' 48" (-45.563213 deg.)
 
  Angular difference between Flight and Ground position is 0.336460 arcmin
 
  Partial Coding Fraction: 0.08398438    [ including projection effects ]

  Duration
     T90: 74.3480000197887 +/- 5.60807597683475
        Measured from: -21.2080000042915
                   to: 53.1400000154972     [s; relative to TRIGTIME]
     T50: 19.3319999873638 +/- 1.83051905035314
        Measured from: -5.60799998044968
                   to: 13.7240000069141     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 1.4040000140667     
                   to: 2.4040000140667     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -29.136000007391     
                   to: 100.272000014782     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     4.978375   7.449881   6.424807   1.512779
           0.166448   0.179099   0.162643   0.131409 [error]
 Peak      0.167633   0.290599   0.263210   0.091610
           0.023303   0.028281   0.025913   0.018814 [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 2.12e-06 3.69e-06 4.91e-06 1.34e-05 1.43e-05 2.42e-05   erg/cm2
              Error 1.26e-07 1.29e-07 1.67e-07 1.04e-06 4.22e-07 1.13e-06   erg/cm2
Peak flux Power-law 2.34e+00 2.36e+00 1.67e+00 1.88e+00 7.12e+00 8.25e+00   ph/cm2/s
              Error 4.09e-01 2.66e-01 1.97e-01 4.33e-01 7.60e-01 8.39e-01   ph/cm2/s
 
Fluence   Cutoff-PL 1.89e-06 3.77e-06 5.14e-06 8.38e-06 1.40e-05 1.92e-05   erg/cm2
              Error 1.68e-07 1.39e-07 2.06e-07 2.03e-06 4.47e-07 2.05e-06   erg/cm2
Peak flux Cutoff-PL 1.93e+00 2.53e+00 1.89e+00 9.83e-01 6.96e+00 7.33e+00   ph/cm2/s
              Error 4.99e-01 3.14e-01 2.63e-01 5.28e-01 7.71e-01 9.27e-01   ph/cm2/s
 
Fluence        Band 1.87e-06 3.75e-06 5.13e-06 8.37e-06 1.40e-05 1.91e-05   erg/cm2
              Error 1.66e-07 1.38e-07 2.06e-07 2.03e-06 4.49e-07 2.05e-06   erg/cm2
Peak flux      Band 1.93e+00 2.53e+00 1.89e+00 9.84e-01 6.96e+00 7.33e+00   ph/cm2/s
              Error 4.99e-01 3.14e-01 2.63e-01 5.27e-01 7.71e-01 9.27e-01   ph/cm2/s
 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.587    0.054    -      -           1.18e-02 3.43e-04   61.246 57
CPL   1.161    0.235     113.5   42.1      1.82e-02 4.28e-03   50.738 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.499    0.158    -      -           5.70e-02 5.81e-03   52.610 57
CPL   0.632    0.721      88.3   58.2      1.45e-01 1.28e-01   47.269 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: 83.776000 sec.
T50 in the 50-300 keV band: 22.976000 sec.
 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100  129.408  -29.136  100.272
T90    74.348  -21.208   53.140
T50    19.332   -5.608   13.724
Peak    1.000    1.404    2.404

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
  121.2457 -45.5632 0.0061   48.3  146.8      16.9118    31.5  TRIG_00276321       
------------------------------------------
 
Foreground time interval of the image:
-29.136  21.877 (delta_t =  51.013 [sec])
Background time interval of the image:
-240.424 -29.136 (delta_t = 211.288 [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  -29.136 sec. to  100.272 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.58653     ( -5.384588E-02   5.382264E-02) )
Norm@50keV  : 1.180711E-02    ( -3.426913E-04   3.426485E-04) )
------------------------------------------------------------
 Chi-Squared =      61.24590     using    59 PHA bins.
 Reduced chi-squared =      1.074489     for     57 degrees of freedom
 Null hypothesis probability = 0.326
 
Photon flux (15-150 keV)    in 129.4 sec: 1.51100 ( -0.0514  0.05166 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.43125e-05 ( -4.21456e-07  4.21585e-07 ) ergs/cm2
 
Cutoff power-law model
Time interval is from  -29.136 sec. to  100.272 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.16050     ( -0.241352   0.228403 )
Epeak [keV] : 113.509      ( -21.5324 62.7103 )
Norm@50keV  : 1.817924E-02    ( -3.674584E-03   4.883187E-03) )
------------------------------------------------------------
 Chi-Squared =      50.73812     using    59 PHA bins.
 Reduced chi-squared =     0.9060379     for     56 degrees of freedom
 Null hypothesis probability = 0.674
 
Photon flux (15-150 keV)    in 129.4 sec: 1.46212 ( -0.05651  0.05693 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.40475e-05 ( -4.51606e-07  4.41642e-07 ) ergs/cm2
 
Band function
Time interval is from  -29.136 sec. to  100.272 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.16056   ( -0.228315   0.241463 )
beta        : -8.38729    ( -1.61271   6.63160 )
Epeak [keV] : 113.499      ( -21.5402 62.7226 )
Norm@50keV   : 1.817606E-02    ( -3.673293E-03   4.885886E-03) )
------------------------------------------------------------
 Chi-Squared =      50.73820     using    59 PHA bins.
 Reduced chi-squared =     0.9225128     for     55 degrees of freedom
 Null hypothesis probability = 0.638
 
Photon flux (15-150 keV)    in 129.4 sec: 1.46213 ( -0.05654  0.05692 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.40343e-05 ( -4.507e-07  4.48112e-07 ) ergs/cm2
 

Peak spectrum fit using the pre-slew DRM

Power-law model
Time interval is from    1.404 sec. to    2.404 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.49907     ( -0.157243   0.159371 )
Norm@50keV  : 5.700777E-02    ( -5.811032E-03   5.807005E-03) )
------------------------------------------------------------
 Chi-Squared =      52.61022     using    59 PHA bins.
 Reduced chi-squared =     0.9229863     for     57 degrees of freedom
 Null hypothesis probability = 0.640
 
Photon flux (15-150 keV)    in 1.000 sec: 7.11503 ( -0.75899  0.76084 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.40886e-07 ( -5.7958e-08  5.8082e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from    1.404 sec. to    2.404 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.631792     ( -0.784836   0.657073 )
Epeak [keV] : 88.3369      ( -20.3253 96.0857 )
Norm@50keV  : 0.145018    ( -7.222429E-02   0.183526 )
------------------------------------------------------------
 Chi-Squared =      47.26868     using    59 PHA bins.
 Reduced chi-squared =     0.8440836     for     56 degrees of freedom
 Null hypothesis probability = 0.791
 
Photon flux (15-150 keV)    in 1.000 sec: 6.96449 ( -0.77005  0.7716 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.37008e-07 ( -6.0259e-08  5.9804e-08 ) ergs/cm2
 
Band function
Time interval is from    1.404 sec. to    2.404 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.633253   ( -0.655613   0.784770 )
beta        : -8.95345    ( -1.04655   7.30902 )
Epeak [keV] : 88.3739      ( -20.3816 96.1077 )
Norm@50keV   : 0.144796    ( -7.207254E-02   0.184422 )
------------------------------------------------------------
 Chi-Squared =      47.26885     using    59 PHA bins.
 Reduced chi-squared =     0.8594336     for     55 degrees of freedom
 Null hypothesis probability = 0.761
 
Photon flux (15-150 keV)    in 1.000 sec: 6.96450 ( -0.77056  0.77164 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.36673e-07 ( -6.022e-08  5.9767e-08 ) ergs/cm2
 
Plot creation:
Thu Dec 13 18:51:47 EST 2007