batgrbproduct Analysis for Trigger=284850

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.41
    Process Start Time (local time): Fri Dec 14 03:53:56 EST 2007
             Host Name: gcn5
   Current Working Dir: /local/data/raid2/prebascript/trigger284850/GCN5_download_cron
======================================================================

  Trigger: 00284850      Segment: 000

  BAT Trigger Time: 206076032.704   [s; MET]
      Trigger Stop: 206076033.216   [s; MET]
               UTC: 2007-07-14T03:20:30.618220    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 42.9432215418995   Dec: 30.235985840538  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    12.37
     Image Trigger?:     NO
     Rate S/N Ratio:     24.454038521275  [ if not an image trigger ]
     Image S/N Ratio:    12.37

  Flight Position:   [ source = BAT ]
    RA: 42.9432215418995   Dec: 30.235985840538  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 42.9326817815162   Dec: 30.2411826052468  [deg; J2000]  
        { 02h 51m 43.8s , +30d 14' 28.3" }
         +/- 1.27676780491556 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.470265610723776 [arcmin] (formal 1-sigma fit error)
    SNR: 21.4550691518548
    RA  =   2h 51m 43.8s  (42.932682 deg.)
    Dec =  30d 14' 28" (30.241183 deg.)
 
  Angular difference between Flight and Ground position is 0.629056 arcmin
 
  Partial Coding Fraction: 0.9609375    [ including projection effects ]

  Duration
     T90: 3 +/- 1.4142135623731
        Measured from: -0.703999996185303
                   to: 2.2960000038147     [s; relative to TRIGTIME]
     T50: 1 +/- 1
        Measured from: 0.296000003814697
                   to: 1.2960000038147     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.296000003814697     
                   to: 1.2960000038147     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.703999996185303     
                   to: 2.2960000038147     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.181351   0.122370   0.031566   0.033394
           0.009901   0.009585   0.008437   0.008455 [error]
 Peak      0.108571   0.079680   0.016843   0.015612
           0.006335   0.005957   0.004997   0.004985 [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 5.30e-08 5.01e-08 3.28e-08 3.34e-08 1.50e-07 1.69e-07   erg/cm2
              Error 6.52e-09 4.99e-09 7.15e-09 1.40e-08 1.59e-08 2.34e-08   erg/cm2
Peak flux Power-law 1.05e+00 5.57e-01 1.84e-01 7.89e-02 1.83e+00 1.87e+00   ph/cm2/s
              Error 1.33e-01 5.40e-02 3.76e-02 2.98e-02 1.68e-01 1.70e-01   ph/cm2/s
 
Fluence   Cutoff-PL 0.00e+00 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 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 5.13e-08 5.03e-08 3.37e-08 3.50e-08 2.70e-07 1.75e-07   erg/cm2
              Error 4.98e-09 5.82e-09 5.20e-09 1.66e-08 0.00e+00 0.00e+00   erg/cm2
Peak flux      Band 1.01e+00 5.86e-01 1.65e-01 4.82e-02 1.79e+00 1.81e+00   ph/cm2/s
              Error 1.44e-01 7.00e-02 4.71e-02 5.17e-02 1.75e-01 1.89e-01   ph/cm2/s
 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    2.608    0.223    -      -           4.83e-03 7.50e-04   59.781 57
CPL   1.954    0.000       2.5    0.0      1.25e-02 0.00e+00   61.439 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    2.595    0.216    -      -           8.79e-03 1.34e-03   70.934 57
CPL   1.943    0.000       3.0    0.0      2.29e-02 0.00e+00   70.323 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: 1.728000 sec.
T50 in the 50-300 keV band: 0.960000 sec.
 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100    3.000   -0.704    2.296
T90     3.000   -0.704    2.296
T50     1.000    0.296    1.296
Peak    1.000    0.296    1.296

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
   42.9327 +30.2412 0.0089   12.6   38.0       0.3776    21.5  TRIG_00284850       
------------------------------------------
 
Foreground time interval of the image:
 -0.704   2.296 (delta_t =   3.000 [sec])
Background time interval of the image:
-239.704  -0.704 (delta_t = 239.000 [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   -0.704 sec. to    2.296 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.60793     ( -0.216657   0.229711 )
Norm@50keV  : 4.833107E-03    ( -7.506176E-04   7.489393E-04) )
------------------------------------------------------------
 Chi-Squared =      59.78071     using    59 PHA bins.
 Reduced chi-squared =      1.048784     for     57 degrees of freedom
 Null hypothesis probability = 0.375
 
Photon flux (15-150 keV)    in 3.000 sec: 1.01587 ( -0.090892  0.09103 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.49611e-07 ( -1.56192e-08  1.61013e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   -0.704 sec. to    2.296 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.95400     (     )
Epeak [keV] : 2.47183      (   )
Norm@50keV  : 1.248423E-02    (     )
------------------------------------------------------------
 Chi-Squared =      61.43904     using    59 PHA bins.
 Reduced chi-squared =      1.097126     for     56 degrees of freedom
 Null hypothesis probability = 0.287
 
Photon flux (15-150 keV)    in 3.000 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2
 
Band function
Time interval is from   -0.704 sec. to    2.296 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.59023   ( -10.6713   4.32867 )
beta        : -2.69998    ( -0.244161   0.215104 )
Epeak [keV] : 12.8192      ( -12.7192 39.7623 )
Norm@50keV   : 2.247278E-02    ( -3.42975   42256.6 )
------------------------------------------------------------
 Chi-Squared =      60.83459     using    59 PHA bins.
 Reduced chi-squared =      1.106084     for     55 degrees of freedom
 Null hypothesis probability = 0.274
 
Photon flux (15-150 keV)    in 3.000 sec: 1.01747 ( -0.093877  0.09123 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.69696e-07 ( 0  0 ) ergs/cm2
 

Peak spectrum fit using the pre-slew DRM

Power-law model
Time interval is from    0.296 sec. to    1.296 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.59487     ( -0.209115   0.221910 )
Norm@50keV  : 8.791479E-03    ( -1.338931E-03   1.333226E-03) )
------------------------------------------------------------
 Chi-Squared =      70.93448     using    59 PHA bins.
 Reduced chi-squared =      1.244465     for     57 degrees of freedom
 Null hypothesis probability = 0.102
 
Photon flux (15-150 keV)    in 1.000 sec: 1.83252 ( -0.16804  0.16822 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.03426e-08 ( -9.5016e-09  9.7644e-09 ) ergs/cm2
 
Cutoff power-law model
Time interval is from    0.296 sec. to    1.296 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.94310     (     )
Epeak [keV] : 3.03555      (   )
Norm@50keV  : 2.291362E-02    (     )
------------------------------------------------------------
 Chi-Squared =      70.32288     using    59 PHA bins.
 Reduced chi-squared =      1.255766     for     56 degrees of freedom
 Null hypothesis probability = 9.435E-02
 
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    0.296 sec. to    1.296 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.51116   ( -8.48884   6.51116 )
beta        : -2.79761    ( -7.20239   0.381165 )
Epeak [keV] : 13.2196      ( -15.6819 7.27169 )
Norm@50keV   : 4.950184E-02    ( -2.123788E-02   5404.50 )
------------------------------------------------------------
 Chi-Squared =      70.41861     using    59 PHA bins.
 Reduced chi-squared =      1.280338     for     55 degrees of freedom
 Null hypothesis probability = 7.871E-02
 
Photon flux (15-150 keV)    in 1.000 sec: 1.79475 ( -0.17677  0.17319 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.49562e-08 ( -7.9524e-09  1.29089e-08 ) ergs/cm2
 
Plot creation:
Fri Dec 14 04:14:08 EST 2007