batgrbproduct Analysis for Trigger=280846

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.41
    Process Start Time (local time): Fri Dec 14 00:40:17 EST 2007
             Host Name: gcn5
   Current Working Dir: /local/data/raid2/prebascript/trigger280846/GCN5_download_cron
======================================================================

  Trigger: 00280846      Segment: 000

  BAT Trigger Time: 202203857.472   [s; MET]
      Trigger Stop: 202203859.52   [s; MET]
               UTC: 2007-05-30T07:44:15.483520    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 278.828202487554   Dec: -32.9721123274726  [deg; J2000]

     Catalogged Source?: YES
     Point Source?:      YES
     GRB Indicated?:     NO    [ by BAT flight software ]
     Image S/N Ratio:    6.72
     Image Trigger?:     NO
     Rate S/N Ratio:     6.40312423743285  [ if not an image trigger ]
     Image S/N Ratio:    6.72

  Flight Position:   [ source = BAT ]
    RA: 278.828202487554   Dec: -32.9721123274726  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 278.759707163301   Dec: -32.8965800049498  [deg; J2000]  
        { 18h 35m 02.3s , -32d 53' 47.7" }
         +/- 5.03927314299544 [arcmin] (estimated 90% radius based on SNR)
         +/- 3.17775692376743 [arcmin] (formal 1-sigma fit error)
    SNR: 3.01811418934002
    RA  =  18h 35m  2.3s  (278.759707 deg.)
    Dec = -32d 53' 48" (-32.896580 deg.)
 
  Angular difference between Flight and Ground position is 5.695251 arcmin
 
  Partial Coding Fraction: 0.984375    [ including projection effects ]

  Duration
     T90: 2.04800000786781 +/- 
        Measured from: 0
                   to: 2.04800000786781     [s; relative to TRIGTIME]
     T50: 2.04800000786781 +/- 
        Measured from: 0
                   to: 2.04800000786781     [s; relative to TRIGTIME]

    WARNING: battblocks failed.  Used TDRSS fore/background intervals

  Fluence
     Peak Flux  (peak 2.04800000786781 second)
        Measured from: -1.49011611938477e-08     
                   to: 2.04799999296665     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 0     
                   to: 2.04800000786781     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.053958   0.001369   0.002002   0.004494
           0.008415   0.007013   0.006100   0.005391 [error]
 Peak      0.053958   0.001369   0.002002   0.004494
           0.008415   0.007013   0.006100   0.005391 [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 1.31e-08 4.09e-09 7.02e-10 1.39e-10 1.80e-08 1.80e-08   erg/cm2
              Error 3.87e-09 2.88e-09 1.16e-09 5.40e-10 6.87e-09 7.00e-09   erg/cm2
Peak flux Power-law 2.20e-01 3.94e-02 3.39e-03 3.14e-04 2.63e-01 2.64e-01   ph/cm2/s
              Error 6.46e-02 2.65e-02 5.68e-03 1.12e-03 8.36e-02 8.37e-02   ph/cm2/s
 
Fluence   Cutoff-PL 1.54e-08 2.36e-09 3.41e-12 8.83e-19 1.78e-08 1.77e-08   erg/cm2
              Error 4.28e-09 2.53e-09 1.81e-10 6.77e-12 5.46e-09 5.42e-09   erg/cm2
Peak flux Cutoff-PL 2.20e-01 3.94e-02 3.38e-03 3.12e-04 2.63e-01 2.63e-01   ph/cm2/s
              Error 6.45e-02 2.65e-02 5.67e-03 1.11e-03 8.36e-02 8.37e-02   ph/cm2/s
 
Fluence        Band 1.29e-08 1.62e-08 0.00e+00 0.00e+00 0.00e+00 0.00e+00   erg/cm2
              Error 7.37e-09 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00   erg/cm2
Peak flux      Band 2.20e-01 3.94e-02 3.28e-03 2.37e-05 2.76e-01 2.63e-01   ph/cm2/s
              Error 6.46e-02 2.65e-02 1.77e-03 8.00e-02 8.37e-02 0.00e+00   ph/cm2/s
 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    4.334    1.195    -      -           3.24e-04 3.57e-04   59.120 57
CPL  -2.500    0.000      13.0    3.3      2.16e+02 5.56e+02   55.688  0
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    4.334    1.195    -      -           3.24e-04 3.57e-04   59.120 57
CPL  -2.500    0.000      13.0    3.3      2.16e+02 5.56e+02   55.688  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    2.048    0.000    2.048
T90     2.048    0.000    2.048
T50     2.048    0.000    2.048
Peak    2.048   -0.000    2.048

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
  278.7597 -32.8966 0.0637   11.2  -57.3       0.0704     3.0  TRIG_00280846       
------------------------------------------
 
Foreground time interval of the image:
  0.000   2.048 (delta_t =   2.048 [sec])
Background time interval of the image:
-10.472  -9.472 (delta_t =   1.000 [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    0.000 sec. to    2.048 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 4.33426     ( -0.820246   1.56995 )
Norm@50keV  : 3.238425E-04    ( -3.238425E-04   3.901400E-04) )
------------------------------------------------------------
 Chi-Squared =      59.11988     using    59 PHA bins.
 Reduced chi-squared =      1.037191     for     57 degrees of freedom
 Null hypothesis probability = 0.398
 
Photon flux (15-150 keV)    in 2.048 sec: 0.263407 ( -0.082932  0.084273 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.80167e-08 ( -6.42189e-09  7.31458e-09 ) ergs/cm2
 
Cutoff power-law model
Time interval is from    0.000 sec. to    2.048 sec.
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.49976     (     )
Epeak [keV] : 13.0155      ( -3.40897 3.14336 )
Norm@50keV  : 215.795    ( -238.527   872.810 )
------------------------------------------------------------
 Chi-Squared =      55.68795     using    59 PHA bins.
 but latest trial   9.60269     gives Chi-Squared =  0.734039
 Reduced chi-squared =     0.9944277     for     56 degrees of freedom
 Null hypothesis probability = 0.487
 
Photon flux (15-150 keV)    in 2.048 sec: 0.263211 ( -0.082908  0.084244 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.77733e-08 ( -5.3668e-09  5.55751e-09 ) ergs/cm2
 
Band function
Time interval is from    0.000 sec. to    2.048 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -9.18962   ( -0.647211   1.41637 )
beta        : -4.53987    ( -1.49823   4.47656 )
Epeak [keV] : 509.386      ( -7.62535 3.04448 )
Norm@50keV   : 3.574057E-02    ( -365.263   39852.0 )
------------------------------------------------------------
 Chi-Squared =      59.02264     using    59 PHA bins.
 Reduced chi-squared =      1.073139     for     55 degrees of freedom
 Null hypothesis probability = 0.331
 
Photon flux (15-150 keV)    in 2.048 sec: 0.276062 ( -0.079549  0.080522 ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2
 

Peak spectrum fit using the pre-slew DRM

Power-law model
Time interval is from    0.000 sec. to    2.048 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 4.33426     ( -0.820246   1.56995 )
Norm@50keV  : 3.238425E-04    ( -3.238425E-04   3.901400E-04) )
------------------------------------------------------------
 Chi-Squared =      59.11988     using    59 PHA bins.
 Reduced chi-squared =      1.037191     for     57 degrees of freedom
 Null hypothesis probability = 0.398
 
Photon flux (15-150 keV)    in 2.048 sec: 0.263407 ( -0.082932  0.084273 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.80167e-08 ( -6.42189e-09  7.31458e-09 ) ergs/cm2
 
Cutoff power-law model
Time interval is from    0.000 sec. to    2.048 sec.
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.49976     (     )
Epeak [keV] : 13.0155      ( -3.40897 3.14336 )
Norm@50keV  : 215.795    ( -238.527   872.810 )
------------------------------------------------------------
 Chi-Squared =      55.68795     using    59 PHA bins.
 but latest trial   9.60269     gives Chi-Squared =  0.734039
 Reduced chi-squared =     0.9944277     for     56 degrees of freedom
 Null hypothesis probability = 0.487
 
Photon flux (15-150 keV)    in 2.048 sec: 0.263211 ( -0.082908  0.084244 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.77733e-08 ( -5.3668e-09  5.55751e-09 ) ergs/cm2
 
Band function
Time interval is from    0.000 sec. to    2.048 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -9.18962   ( -0.647211   1.41637 )
beta        : -4.53987    ( -1.49823   4.47656 )
Epeak [keV] : 509.386      ( -7.62535 3.04448 )
Norm@50keV   : 3.574057E-02    ( -365.263   39852.0 )
------------------------------------------------------------
 Chi-Squared =      59.02264     using    59 PHA bins.
 Reduced chi-squared =      1.073139     for     55 degrees of freedom
 Null hypothesis probability = 0.331
 
Photon flux (15-150 keV)    in 2.048 sec: 0.276062 ( -0.079549  0.080522 ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2
 
Plot creation:
Fri Dec 14 00:46:31 EST 2007