batgrbproduct Analysis for Trigger=176818

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.41
    Process Start Time (local time): Mon Dec 31 08:56:12 EST 2007
             Host Name: gcn5
   Current Working Dir: /local/data/raid2/prebascript/trigger176818/SDC
======================================================================

  Trigger: 00176818      Segment: 000

  BAT Trigger Time: 158646187.072   [s; MET]
      Trigger Stop: 158646187.584   [s; MET]
               UTC: 2006-01-11T04:23:06.123420    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 276.212529459245   Dec: 37.6021981979871  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.47
     Image Trigger?:     NO
     Rate S/N Ratio:     13.490737563232  [ if not an image trigger ]
     Image S/N Ratio:    7.47

  Flight Position:   [ source = BAT ]
    RA: 276.212529459245   Dec: 37.6021981979871  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 276.197841767289   Dec: 37.6025566787104  [deg; J2000]  
        { 18h 24m 47.5s , +37d 36' 09.2" }
         +/- 0.745167922406025 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.176203201094378 [arcmin] (formal 1-sigma fit error)
    SNR: 46.303353899396
    RA  =  18h 24m 47.5s  (276.197842 deg.)
    Dec =  37d 36'  9" (37.602557 deg.)
 
  Angular difference between Flight and Ground position is 0.698523 arcmin
 
  Partial Coding Fraction: 0.9765625    [ including projection effects ]

  Duration
     T90: 13.2200000286102 +/- 1.15467742377442
        Measured from: 0.42399999499321
                   to: 13.6440000236034     [s; relative to TRIGTIME]
     T50: 5.86800000071526 +/- 0.370621082343099
        Measured from: 3.11599999666214
                   to: 8.9839999973774     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 4.3120000064373     
                   to: 5.3120000064373     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.65200001001358     
                   to: 17.5760000050068     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.595927   0.850770   0.545648   0.082720
           0.022919   0.024034   0.020888   0.017208 [error]
 Peak      0.050848   0.088571   0.062827   0.015332
           0.005658   0.006080   0.005331   0.004204 [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 2.01e-07 3.37e-07 4.31e-07 1.11e-06 1.27e-06 2.07e-06   erg/cm2
              Error 1.35e-08 1.34e-08 2.12e-08 1.19e-07 5.05e-08 1.36e-07   erg/cm2
Peak flux Power-law 5.43e-01 5.79e-01 4.37e-01 5.38e-01 1.76e+00 2.10e+00   ph/cm2/s
              Error 7.57e-02 5.04e-02 4.32e-02 1.08e-01 1.44e-01 1.72e-01   ph/cm2/s
 
Fluence   Cutoff-PL 1.74e-07 3.58e-07 4.46e-07 4.32e-07 1.20e-06 1.43e-06   erg/cm2
              Error 1.67e-08 1.61e-08 2.38e-08 1.54e-07 5.83e-08 1.64e-07   erg/cm2
Peak flux Cutoff-PL 4.62e-01 6.29e-01 4.72e-01 2.25e-01 1.71e+00 1.79e+00   ph/cm2/s
              Error 9.10e-02 6.30e-02 5.17e-02 1.32e-01 1.49e-01 1.95e-01   ph/cm2/s
 
Fluence        Band 1.74e-07 3.58e-07 4.41e-07 6.00e-07 1.20e-06 1.42e-06   erg/cm2
              Error 1.71e-08 1.65e-08 2.67e-08 2.81e-07 5.74e-08 1.63e-07   erg/cm2
Peak flux      Band 4.62e-01 6.30e-01 4.72e-01 2.25e-01 1.71e+00 1.79e+00   ph/cm2/s
              Error 9.10e-02 4.73e-02 5.17e-02 1.32e-01 1.49e-01 1.95e-01   ph/cm2/s
 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.646    0.069    -      -           7.51e-03 2.82e-04   69.036 57
CPL   0.915    0.315      74.5   14.2      1.73e-02 6.30e-03   50.366 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.404    0.134    -      -           1.45e-02 1.17e-03   55.714 57
CPL   0.508    0.645      84.1   41.9      4.09e-02 3.45e-02   48.612 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: 11.008000 sec.
T50 in the 50-300 keV band: 5.248000 sec.
 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   18.228   -0.652   17.576
T90    13.220    0.424   13.644
T50     5.868    3.116    8.984
Peak    1.000    4.312    5.312

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
  276.1978 +37.6026 0.0042   18.0  -34.1       2.0054    46.3  TRIG_00176818       
------------------------------------------
 
Foreground time interval of the image:
 -0.652  13.733 (delta_t =  14.385 [sec])
Background time interval of the image:
-299.072  -0.652 (delta_t = 298.420 [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   -0.652 sec. to   17.576 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.64582     ( -6.847370E-02   6.871891E-02) )
Norm@50keV  : 7.511824E-03    ( -2.826252E-04   2.821158E-04) )
------------------------------------------------------------
 Chi-Squared =      69.03595     using    59 PHA bins.
 Reduced chi-squared =      1.211157     for     57 degrees of freedom
 Null hypothesis probability = 0.132
 
Photon flux (15-150 keV)    in 18.23 sec: 0.979511 ( -0.038634  0.038749 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.27413e-06 ( -5.03987e-08  5.06685e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   -0.652 sec. to   17.576 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.915179     ( -0.326793   0.302950 )
Epeak [keV] : 74.4674      ( -9.54633 18.7982 )
Norm@50keV  : 1.729456E-02    ( -4.961866E-03   7.628424E-03) )
------------------------------------------------------------
 Chi-Squared =      50.36561     using    59 PHA bins.
 Reduced chi-squared =     0.8993859     for     56 degrees of freedom
 Null hypothesis probability = 0.687
 
Photon flux (15-150 keV)    in 18.23 sec: 0.935705 ( -0.042192  0.042244 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.20342e-06 ( -5.80862e-08  5.85019e-08 ) ergs/cm2
 
Band function
Time interval is from   -0.652 sec. to   17.576 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.876532   ( -0.329238   0.838681 )
beta        : -2.41822    ( -7.58178   0.508229 )
Epeak [keV] : 72.2664      ( -43.9644 19.7546 )
Norm@50keV   : 1.820990E-02    ( -5.703785E-03   0.127079 )
------------------------------------------------------------
 Chi-Squared =      50.13775     using    59 PHA bins.
 Reduced chi-squared =     0.9115954     for     55 degrees of freedom
 Null hypothesis probability = 0.661
 
Photon flux (15-150 keV)    in 18.23 sec: 0.934540 ( -0.042567  0.041857 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.20177e-06 ( -5.68357e-08  5.78802e-08 ) ergs/cm2
 

Peak spectrum fit using the pre-slew DRM

Power-law model
Time interval is from    4.312 sec. to    5.312 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.40409     ( -0.134240   0.134707 )
Norm@50keV  : 1.447233E-02    ( -1.172553E-03   1.170114E-03) )
------------------------------------------------------------
 Chi-Squared =      55.71385     using    59 PHA bins.
 Reduced chi-squared =     0.9774360     for     57 degrees of freedom
 Null hypothesis probability = 0.523
 
Photon flux (15-150 keV)    in 1.000 sec: 1.76411 ( -0.14368  0.14384 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.39703e-07 ( -1.2452e-08  1.2592e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from    4.312 sec. to    5.312 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.507783     ( -0.695344   0.594884 )
Epeak [keV] : 84.0535      ( -17.9855 65.7798 )
Norm@50keV  : 4.085133E-02    ( -1.999430E-02   4.895781E-02) )
------------------------------------------------------------
 Chi-Squared =      48.61208     using    59 PHA bins.
 Reduced chi-squared =     0.8680729     for     56 degrees of freedom
 Null hypothesis probability = 0.748
 
Photon flux (15-150 keV)    in 1.000 sec: 1.71088 ( -0.14869  0.14832 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.32068e-07 ( -1.3772e-08  1.3795e-08 ) ergs/cm2
 
Band function
Time interval is from    4.312 sec. to    5.312 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.507493   ( -0.595147   0.666948 )
beta        : -9.15908    ( -0.840919   19.1590 )
Epeak [keV] : 84.0350      ( -18.9956 65.5971 )
Norm@50keV   : 4.086256E-02    ( -2.001852E-02   4.898617E-02) )
------------------------------------------------------------
 Chi-Squared =      48.61200     using    59 PHA bins.
 Reduced chi-squared =     0.8838544     for     55 degrees of freedom
 Null hypothesis probability = 0.716
 
Photon flux (15-150 keV)    in 1.000 sec: 1.71068 ( -0.14849  0.14862 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.32037e-07 ( -1.3815e-08  1.3729e-08 ) ergs/cm2
 
Plot creation:
Mon Dec 31 09:06:08 EST 2007