batgrbproduct Analysis for Trigger=283791

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.41
    Process Start Time (local time): Fri Dec 14 03:30:26 EST 2007
             Host Name: gcn5
   Current Working Dir: /local/data/raid2/prebascript/trigger283791/GCN5_download_cron
======================================================================

  Trigger: 00283791      Segment: 000

  BAT Trigger Time: 205272360   [s; MET]
      Trigger Stop: 205272424   [s; MET]
               UTC: 2007-07-04T20:05:57.934440    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 354.72344217874   Dec: 66.2478751765386  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    16.12
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    16.12

  Flight Position:   [ source = BAT ]
    RA: 354.72344217874   Dec: 66.2478751765386  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 354.705440299763   Dec: 66.2573633778711  [deg; J2000]  
        { 23h 38m 49.3s , +66d 15' 26.5" }
         +/- 1.61764025135931 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.834303596855121 [arcmin] (formal 1-sigma fit error)
    SNR: 15.3008515516708
    RA  =  23h 38m 49.3s  (354.705440 deg.)
    Dec =  66d 15' 27" (66.257363 deg.)
 
  Angular difference between Flight and Ground position is 0.716442 arcmin
 
  Partial Coding Fraction: 0.4257812    [ including projection effects ]

  Duration
     T90: 384.204000025988 +/- 24.5347665138576
        Measured from: -53.7520000040531
                   to: 330.452000021935     [s; relative to TRIGTIME]
     T50: 66.6599999964237 +/- 14.9316678251548
        Measured from: -39.1119999885559
                   to: 27.5480000078678     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -53.0999999940395     
                   to: -52.0999999940395     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -57.3160000145435     
                   to: 400.775999993086     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     2.979430   3.649257   2.484701   0.582572
           0.121099   0.122232   0.106994   0.091096 [error]
 Peak      0.043800   0.088660   0.095527   0.026401
           0.005222   0.005920   0.005703   0.004219 [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 1.08e-06 1.67e-06 1.93e-06 4.31e-06 5.95e-06 8.99e-06   erg/cm2
              Error 8.40e-08 7.48e-08 1.07e-07 5.32e-07 2.56e-07 6.00e-07   erg/cm2
Peak flux Power-law 5.28e-01 6.65e-01 6.10e-01 9.77e-01 2.14e+00 2.78e+00   ph/cm2/s
              Error 7.35e-02 5.73e-02 4.29e-02 1.44e-01 1.53e-01 1.89e-01   ph/cm2/s
 
Fluence   Cutoff-PL 1.04e-06 1.69e-06 1.96e-06 3.38e-06 5.88e-06 8.03e-06   erg/cm2
              Error 1.07e-07 8.43e-08 1.17e-07 1.23e-06 2.08e-07 1.27e-06   erg/cm2
Peak flux Cutoff-PL 4.34e-01 6.90e-01 6.72e-01 5.50e-01 2.09e+00 2.35e+00   ph/cm2/s
              Error 9.42e-02 6.40e-02 6.17e-02 2.26e-01 1.57e-01 2.73e-01   ph/cm2/s
 
Fluence        Band 1.07e-06 1.66e-06 1.92e-06 4.21e-06 5.92e-06 8.96e-06   erg/cm2
              Error 6.57e-08 7.94e-08 6.98e-08 5.02e-07 2.49e-07 4.77e-07   erg/cm2
Peak flux      Band 4.04e-01 7.07e-01 6.61e-01 7.41e-01 2.07e+00 2.52e+00   ph/cm2/s
              Error 1.11e-01 7.25e-02 6.07e-02 2.68e-01 1.60e-01 2.91e-01   ph/cm2/s
 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.786    0.080    -      -           1.41e-03 5.95e-05   53.393 57
CPL   1.522    0.293      94.8    0.0      1.88e-03 5.44e-04   52.692 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.124    0.113    -      -           1.84e-02 1.25e-03   51.737 57
CPL   0.403    0.558     130.8  104.3      3.80e-02 2.26e-02   45.942 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: 64.192000 sec.
T50 in the 50-300 keV band: 25.856000 sec.
 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100  458.092  -57.316  400.776
T90   384.204  -53.752  330.452
T50    66.660  -39.112   27.548
Peak    1.000  -53.100  -52.100

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
  354.7054 +66.2574 0.0126   42.5  174.4       2.1422    15.3  TRIG_00283791       
------------------------------------------
 
Foreground time interval of the image:
 -2.699  70.101 (delta_t =  72.800 [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
Time interval is from  -57.316 sec. to  400.776 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.78609     ( -7.933831E-02   7.994759E-02) )
Norm@50keV  : 1.409938E-03    ( -5.962455E-05   5.940767E-05) )
------------------------------------------------------------
 Chi-Squared =      53.39332     using    59 PHA bins.
 Reduced chi-squared =     0.9367249     for     57 degrees of freedom
 Null hypothesis probability = 0.611
 
Photon flux (15-150 keV)    in 458.1 sec: 0.193249 ( -0.008954  0.009 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.94925e-06 ( -2.55482e-07  2.56444e-07 ) ergs/cm2
 
Cutoff power-law model
Time interval is from  -57.316 sec. to  400.776 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.52160     ( -0.253029   0.332626 )
Epeak [keV] : 94.8057      (   )
Norm@50keV  : 1.878825E-03    ( -2.545593E-04   8.344364E-04) )
------------------------------------------------------------
 Chi-Squared =      52.69191     using    59 PHA bins.
 Reduced chi-squared =     0.9409270     for     56 degrees of freedom
 Null hypothesis probability = 0.601
 
Photon flux (15-150 keV)    in 458.1 sec: 0.190769 ( -0.0098  0.004917 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.88448e-06 ( -1.41278e-07  2.75685e-07 ) ergs/cm2
 
Band function
Time interval is from  -57.316 sec. to  400.776 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.40017   ( -8.59983   4.07369 )
beta        : -1.81286    ( -7.72817   0.550744 )
Epeak [keV] : 51.8932      ( -101.835 9898.06 )
Norm@50keV   : 2.464929E-03    ( -3.556384E-04   327.238 )
------------------------------------------------------------
 Chi-Squared =      53.08123     using    59 PHA bins.
 Reduced chi-squared =     0.9651133     for     55 degrees of freedom
 Null hypothesis probability = 0.548
 
Photon flux (15-150 keV)    in 458.1 sec: 0.190772 ( -0.009843  0.009878 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.92484e-06 ( -2.53971e-07  2.44396e-07 ) ergs/cm2
 

Peak spectrum fit using the pre-slew DRM

Power-law model
Time interval is from  -53.100 sec. to  -52.100 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.12440     ( -0.113931   0.111966 )
Norm@50keV  : 1.836851E-02    ( -1.253977E-03   1.249703E-03) )
------------------------------------------------------------
 Chi-Squared =      51.73697     using    59 PHA bins.
 Reduced chi-squared =     0.9076661     for     57 degrees of freedom
 Null hypothesis probability = 0.672
 
Photon flux (15-150 keV)    in 1.000 sec: 2.13592 ( -0.15318  0.15366 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.90595e-07 ( -1.319e-08  1.3201e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from  -53.100 sec. to  -52.100 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.402834     ( -0.596898   0.519377 )
Epeak [keV] : 130.809      ( -34.4817 174.066 )
Norm@50keV  : 3.799242E-02    ( -1.526300E-02   2.998012E-02) )
------------------------------------------------------------
 Chi-Squared =      45.94166     using    59 PHA bins.
 Reduced chi-squared =     0.8203868     for     56 degrees of freedom
 Null hypothesis probability = 0.829
 
Photon flux (15-150 keV)    in 1.000 sec: 2.08939 ( -0.15629  0.15681 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.88036e-07 ( -1.3865e-08  1.3652e-08 ) ergs/cm2
 
Band function
Time interval is from  -53.100 sec. to  -52.100 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 0.182878   ( -0.941548   1.75830 )
beta        : -1.51231    ( -8.48769   0.280950 )
Epeak [keV] : 84.7022      ( -29.5842 115.816 )
Norm@50keV   : 7.825876E-02    ( -7.825876E-02   0.630717 )
------------------------------------------------------------
 Chi-Squared =      44.47772     using    59 PHA bins.
 Reduced chi-squared =     0.8086858     for     55 degrees of freedom
 Null hypothesis probability = 0.844
 
Photon flux (15-150 keV)    in 1.000 sec: 2.06565 ( -0.16457  0.1548 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.87888e-07 ( -1.3816e-08  1.3677e-08 ) ergs/cm2
 
Plot creation:
Fri Dec 14 03:52:32 EST 2007