batgrbproduct Analysis for Trigger=208050

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.41
    Process Start Time (local time): Mon Dec 31 21:02:11 EST 2007
             Host Name: gcn5
   Current Working Dir: /local/data/raid2/prebascript/trigger208050/GCN5_download_cron
======================================================================

  Trigger: 00208050      Segment: 000

  BAT Trigger Time: 168164100.032   [s; MET]
      Trigger Stop: 168164101.056   [s; MET]
               UTC: 2006-05-01T08:14:58.865920    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 328.367202913993   Dec: 43.9831881862281  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    11.15
     Image Trigger?:     NO
     Rate S/N Ratio:     23.3023603954621  [ if not an image trigger ]
     Image S/N Ratio:    11.15

  Flight Position:   [ source = BAT ]
    RA: 328.367202913993   Dec: 43.9831881862281  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 328.370915035877   Dec: 43.9994786381414  [deg; J2000]  
        { 21h 53m 29.0s , +43d 59' 58.1" }
         +/- 1.35508372763992 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.468610625719666 [arcmin] (formal 1-sigma fit error)
    SNR: 19.7058574547129
    RA  =  21h 53m 29.0s  (328.370915 deg.)
    Dec =  43d 59' 58" (43.999479 deg.)
 
  Angular difference between Flight and Ground position is 0.990475 arcmin
 
  Partial Coding Fraction: 0.3671875    [ including projection effects ]

  Duration
     T90: 21.8759999871254 +/- 4.78632594694618
        Measured from: -0.659999996423721
                   to: 21.2159999907017     [s; relative to TRIGTIME]
     T50: 7.06000000238419 +/- 1.36816958109932
        Measured from: 0.972000002861023
                   to: 8.03200000524521     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.363999992609024     
                   to: 1.36399999260902     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -1.27599999308586     
                   to: 25.9560000002384     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.429666   0.652315   0.518466   0.157062
           0.046031   0.047811   0.043412   0.037934 [error]
 Peak      0.042397   0.082303   0.095582   0.025471
           0.009267   0.010316   0.010004   0.007940 [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 1.56e-07 2.94e-07 4.30e-07 1.34e-06 1.22e-06 2.21e-06   erg/cm2
              Error 2.42e-08 2.72e-08 4.15e-08 2.90e-07 1.03e-07 3.14e-07   erg/cm2
Peak flux Power-law 4.42e-01 6.04e-01 5.97e-01 1.08e+00 1.99e+00 2.71e+00   ph/cm2/s
              Error 1.14e-01 8.77e-02 7.37e-02 2.75e-01 2.42e-01 3.38e-01   ph/cm2/s
 
Fluence   Cutoff-PL 1.47e-07 2.99e-07 4.42e-07 1.01e-06 1.21e-06 1.88e-06   erg/cm2
              Error 3.02e-08 3.11e-08 4.89e-08 5.44e-07 7.94e-08 5.51e-07   erg/cm2
Peak flux Cutoff-PL 3.71e-01 5.99e-01 6.42e-01 7.55e-01 1.95e+00 2.36e+00   ph/cm2/s
              Error 1.96e-01 1.12e-01 1.05e-01 3.92e-01 2.75e-01 5.03e-01   ph/cm2/s
 
Fluence        Band 1.46e-07 2.99e-07 4.41e-07 1.01e-06 1.21e-06 1.92e-06   erg/cm2
              Error 2.99e-08 3.02e-08 4.99e-08 5.44e-07 1.07e-07 5.50e-07   erg/cm2
Peak flux      Band 3.71e-01 5.99e-01 6.42e-01 7.55e-01 1.95e+00 2.37e+00   ph/cm2/s
              Error 1.60e-01 1.12e-01 1.05e-01 4.42e-01 2.76e-01 5.24e-01   ph/cm2/s
 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.453    0.144    -      -           4.68e-03 3.75e-04   56.345 57
CPL   1.171    0.489     164.0 5000.0      6.27e-03 5.62e-03   55.887 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.000    0.216    -      -           1.72e-02 2.26e-03   62.046 57
CPL   0.501    0.823     195.8 5000.0      2.70e-02 2.38e-02   60.997  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: 11.072000 sec.
T50 in the 50-300 keV band: 4.544000 sec.
 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   27.232   -1.276   25.956
T90    21.876   -0.660   21.216
T50     7.060    0.972    8.032
Peak    1.000    0.364    1.364

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
  328.3709 +43.9995 0.0098   47.7 -170.2       1.7745    19.7  TRIG_00208050       
------------------------------------------
 
Foreground time interval of the image:
 -1.276  25.956 (delta_t =  27.232 [sec])
Background time interval of the image:
-204.731 -192.192 (delta_t =  12.539 [sec])
-191.032  -1.276 (delta_t = 189.756 [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   -1.276 sec. to   25.956 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.45306     ( -0.144008   0.143750 )
Norm@50keV  : 4.678620E-03    ( -3.751968E-04   3.751907E-04) )
------------------------------------------------------------
 Chi-Squared =      56.34495     using    59 PHA bins.
 Reduced chi-squared =     0.9885079     for     57 degrees of freedom
 Null hypothesis probability = 0.500
 
Photon flux (15-150 keV)    in 27.23 sec: 0.577013 ( -0.050325  0.050557 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.21851e-06 ( -1.03085e-07  1.0318e-07 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   -1.276 sec. to   25.956 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.17082     ( -0.567481   0.411191 )
Epeak [keV] : 164.004      ( -163.994 9836.00 )
Norm@50keV  : 6.271798E-03    ( -6.271799E-03   4.965201E-03) )
------------------------------------------------------------
 Chi-Squared =      55.88731     using    59 PHA bins.
 Reduced chi-squared =     0.9979876     for     56 degrees of freedom
 Null hypothesis probability = 0.479
 
Photon flux (15-150 keV)    in 27.23 sec: 0.570459 ( -0.052557  0.05268 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.20948e-06 ( -5.36186e-08  1.05268e-07 ) ergs/cm2
 
Band function
Time interval is from   -1.276 sec. to   25.956 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.11293   ( -8.88707   2.24008 )
beta        : -1.54208    ( -7.45712   1.22001 )
Epeak [keV] : 119.436      ( -167.385 9832.51 )
Norm@50keV   : 7.035808E-03    ( -1.904217E-03   2.879261E-02) )
------------------------------------------------------------
 Chi-Squared =      56.21618     using    59 PHA bins.
 Reduced chi-squared =      1.022112     for     55 degrees of freedom
 Null hypothesis probability = 0.429
 
Photon flux (15-150 keV)    in 27.23 sec: 0.570422 ( -0.052627  0.05268 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.20833e-06 ( -1.0697e-07  1.06053e-07 ) ergs/cm2
 

Peak spectrum fit using the pre-slew DRM

Power-law model
Time interval is from    0.364 sec. to    1.364 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.999826     ( -0.220993   0.210544 )
Norm@50keV  : 1.721254E-02    ( -2.282525E-03   2.242737E-03) )
------------------------------------------------------------
 Chi-Squared =      62.04604     using    59 PHA bins.
 Reduced chi-squared =      1.088527     for     57 degrees of freedom
 Null hypothesis probability = 0.301
 
Photon flux (15-150 keV)    in 1.000 sec: 1.98974 ( -0.24171  0.2415 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.85872e-07 ( -2.2686e-08  2.3262e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from    0.364 sec. to    1.364 sec.
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.501388     ( -1.02050   0.625465 )
Epeak [keV] : 195.767      ( -195.757 9804.23 )
Norm@50keV  : 2.704755E-02    ( -1.153612E-02   3.607552E-02) )
------------------------------------------------------------
 Chi-Squared =      60.99673     using    59 PHA bins.
 but latest trial   1.12685     gives Chi-Squared =   6.12428
 Reduced chi-squared =      1.089227     for     56 degrees of freedom
 Null hypothesis probability = 0.301
 
Photon flux (15-150 keV)    in 1.000 sec: 1.94529 ( -0.2746  0.27588 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.86315e-07 ( -2.3497e-08  2.3316e-08 ) ergs/cm2
 
Band function
Time interval is from    0.364 sec. to    1.364 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.612621   ( -9.38738   5.61262 )
beta        : -1.01921    ( -7.30137   1.86797 )
Epeak [keV] : 122.252      ( -195.604 9804.30 )
Norm@50keV   : 2.996126E-02    ( -1.154503E-02   499595. )
------------------------------------------------------------
 Chi-Squared =      61.93612     using    59 PHA bins.
 Reduced chi-squared =      1.126111     for     55 degrees of freedom
 Null hypothesis probability = 0.242
 
Photon flux (15-150 keV)    in 1.000 sec: 1.94540 ( -0.27477  0.27651 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.86221e-07 ( -2.3463e-08  2.3369e-08 ) ergs/cm2
 
Plot creation:
Mon Dec 31 21:19:36 EST 2007