batgrbproduct Analysis for Trigger=280958

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.41
    Process Start Time (local time): Fri Dec 14 00:47:40 EST 2007
             Host Name: gcn5
   Current Working Dir: /local/data/raid2/prebascript/trigger280958/SDC
======================================================================

  Trigger: 00280958      Segment: 000

  BAT Trigger Time: 202270219.52   [s; MET]
      Trigger Stop: 202270223.616   [s; MET]
               UTC: 2007-05-31T02:10:17.529860    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 6.67853589686105   Dec: 74.3038706234283  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    10.24
     Image Trigger?:     NO
     Rate S/N Ratio:     14.0712472794703  [ if not an image trigger ]
     Image S/N Ratio:    10.24

  Flight Position:   [ source = BAT ]
    RA: 6.67853589686105   Dec: 74.3038706234283  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 6.70236885399593   Dec: 74.313355046058  [deg; J2000]  
        { 00h 26m 48.6s , +74d 18' 48.1" }
         +/- 1.7408271321957 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.753581685765298 [arcmin] (formal 1-sigma fit error)
    SNR: 13.7778591778342
    RA  =   0h 26m 48.6s  (6.702369 deg.)
    Dec =  74d 18' 48" (74.313355 deg.)
 
  Angular difference between Flight and Ground position is 0.688046 arcmin
 
  Partial Coding Fraction: 0.4414062    [ including projection effects ]

  Duration
     T90: 44.4920000135899 +/- 5.95717553211001
        Measured from: -1.04800000786781
                   to: 43.444000005722     [s; relative to TRIGTIME]
     T50: 21.3840000033379 +/- 5.85877802671562
        Measured from: 2.47999998927116
                   to: 23.863999992609     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 1.0799999833107     
                   to: 2.0799999833107     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -2.41200000047684     
                   to: 46.3400000035763     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.345901   0.576073   0.492851   0.195185
           0.056176   0.057834   0.053590   0.051934 [error]
 Peak      0.023955   0.034230   0.050280   0.022217
           0.007990   0.008603   0.008284   0.007697 [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 1.30e-07 2.53e-07 3.83e-07 1.25e-06 1.08e-06 2.01e-06   erg/cm2
              Error 2.70e-08 3.12e-08 5.13e-08 3.78e-07 1.27e-07 4.09e-07   erg/cm2
Peak flux Power-law 2.16e-01 2.98e-01 3.04e-01 5.66e-01 1.00e-00 1.38e+00   ph/cm2/s
              Error 1.03e-01 8.64e-02 6.21e-02 2.62e-01 2.21e-01 2.89e-01   ph/cm2/s
 
Fluence   Cutoff-PL 1.26e-07 2.56e-07 3.89e-07 1.05e-06 1.07e-06 1.70e-06   erg/cm2
              Error 3.17e-08 3.49e-08 6.05e-08 6.80e-07 1.28e-07 5.79e-07   erg/cm2
Peak flux Cutoff-PL 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00   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        Band 1.82e-06 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00   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      Band 1.39e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00   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
 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.405    0.197    -      -           2.29e-03 2.49e-04   54.571 57
CPL   1.200    0.572     214.9 4957.4      2.83e-03 2.08e-03   54.508 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    0.971    0.380    -      -           8.70e-03 1.89e-03   50.049 57
CPL   0.754    0.000     363.2    0.0      1.07e-02 0.00e+00   50.054 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: 45.632000 sec.
T50 in the 50-300 keV band: 25.664000 sec.
 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   48.752   -2.412   46.340
T90    44.492   -1.048   43.444
T50    21.384    2.480   23.864
Peak    1.000    1.080    2.080

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
    6.7024 +74.3134 0.0139   44.2 -175.5       1.6680    13.8  TRIG_00280958       
------------------------------------------
 
Foreground time interval of the image:
 -2.412  44.285 (delta_t =  46.697 [sec])
Background time interval of the image:
-239.520  -2.412 (delta_t = 237.108 [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   -2.412 sec. to   46.340 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.40451     ( -0.197153   0.196535 )
Norm@50keV  : 2.285414E-03    ( -2.490715E-04   2.489134E-04) )
------------------------------------------------------------
 Chi-Squared =      54.57090     using    59 PHA bins.
 Reduced chi-squared =     0.9573842     for     57 degrees of freedom
 Null hypothesis probability = 0.567
 
Photon flux (15-150 keV)    in 48.75 sec: 0.278610 ( -0.032153  0.032328 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.07552e-06 ( -1.26321e-07  1.27233e-07 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   -2.412 sec. to   46.340 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.20027     ( -0.747791   0.396437 )
Epeak [keV] : 214.946      ( -129.822 9785.05 )
Norm@50keV  : 2.833765E-03    ( -7.874202E-04   3.369662E-03) )
------------------------------------------------------------
 Chi-Squared =      54.50805     using    59 PHA bins.
 Reduced chi-squared =     0.9733581     for     56 degrees of freedom
 Null hypothesis probability = 0.532
 
Photon flux (15-150 keV)    in 48.75 sec: 0.276996 ( -0.033269  0.033162 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.07033e-06 ( -1.28983e-07  1.27701e-07 ) ergs/cm2
 
Band function
Time interval is from   -2.412 sec. to   46.340 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.03826   ( -8.84174   4.97678 )
beta        : -1.40948    ( -8.03768   0.751768 )
Epeak [keV] : 62.2906      ( -248.156 9751.74 )
Norm@50keV   : 4.345518E-03    ( -6.910339E-04   67325.5 )
------------------------------------------------------------
 Chi-Squared =      54.60537     using    59 PHA bins.
 Reduced chi-squared =     0.9928249     for     55 degrees of freedom
 Null hypothesis probability = 0.490
 
Photon flux (15-150 keV)    in 48.75 sec: 0.276998 ( -0.033276  0.016638 ) 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    1.080 sec. to    2.080 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.971038     ( -0.397798   0.362636 )
Norm@50keV  : 8.695384E-03    ( -1.925189E-03   1.848275E-03) )
------------------------------------------------------------
 Chi-Squared =      50.04871     using    59 PHA bins.
 Reduced chi-squared =     0.8780475     for     57 degrees of freedom
 Null hypothesis probability = 0.731
 
Photon flux (15-150 keV)    in 1.000 sec: 0.999708 ( -0.219928  0.222642 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.50042e-08 ( -1.94545e-08  1.95128e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from    1.080 sec. to    2.080 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.753664     (     )
Epeak [keV] : 363.164      (   )
Norm@50keV  : 1.065009E-02    (     )
------------------------------------------------------------
 Chi-Squared =      50.05415     using    59 PHA bins.
 Reduced chi-squared =     0.8938240     for     56 degrees of freedom
 Null hypothesis probability = 0.698
 
Photon flux (15-150 keV)    in 1.000 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2
 
Band function
Time interval is from    1.080 sec. to    2.080 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.864248   ( -14.2558   0.744248 )
beta        : -0.971026    ( -0.372782   0.396182 )
Epeak [keV] : 20.7722      ( -20.6722 9979.23 )
Norm@50keV   : 1.367839E-02    ( -408.796   2712.48 )
------------------------------------------------------------
 Chi-Squared =      50.04871     using    59 PHA bins.
 Reduced chi-squared =     0.9099765     for     55 degrees of freedom
 Null hypothesis probability = 0.664
 
Photon flux (15-150 keV)    in 1.000 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2
 
Plot creation:
Fri Dec 14 01:05:19 EST 2007