Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Mon Jan 20 05:11:42 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger299787
======================================================================

  Trigger: 00299787      Segment: 000

  BAT Trigger Time: 220479229.504   [s; MET]
      Trigger Stop: 220479230.528   [s; MET]
               UTC: 2007-12-27T20:13:47.043260    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 58.1198112281124   Dec: -55.9526448765147  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.54
     Image Trigger?:     NO
     Rate S/N Ratio:     37.8549864614954  [ if not an image trigger ]
     Image S/N Ratio:    8.54

  Analysis Position:   [ source = BAT ]
    RA: 58.1198112281124   Dec: -55.9526448765147  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 58.1172025366673   Dec: -55.9367668281692  [deg; J2000]  
        { 03h 52m 28.1s , -55d 56' 12.4" }
         +/- 2.50386102313717 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.46768212690744 [arcmin] (formal 1-sigma fit error)
    SNR: 8.19738266487804
 
  Angular difference between the analysis and refined position is 0.956707 arcmin
 
  Partial Coding Fraction: 0.4804688    [ including projection effects ]

  Duration
     T90: 142.480000019073 +/- 48.3692418348664
        Measured from: 0.0639999806880951
                   to: 142.543999999762     [s; relative to TRIGTIME]
     T50: 76.0879999995232 +/- 29.0811282443047
        Measured from: 1.06000000238419
                   to: 77.1480000019073     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.0999999940395355     
                   to: 0.900000005960464     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.143999993801117     
                   to: 150.551999986172     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.383434   0.393825   0.140048   0.176553
           0.065006   0.067416   0.059104   0.051044 [error]
 Peak      0.045265   0.071889   0.068048   0.034503
           0.007711   0.009178   0.008787   0.007965 [error]

     [ fluence units of on-axis counts / fully illuminated detector ] 

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  150.696   -0.144  150.552
T90   142.480    0.064  142.544
T50    76.088    1.060   77.148
Peak    1.000   -0.100    0.900
 
 
====== Spectral Analysis Summary =====================================
 
Model      : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index   : photon index: E^{Ph_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 both the PL model and CPL model
Nomr_90err : 90% error of the normalization
chi2       : Chi-Squared
dof        : degree of freedo
 
=== Time-averaged spectral analysis ===
(Best model with acceptable fit: PL)
 
Model Ph_index Ph_90err_low Ph_90err_hi  Epeak  Epeak_90err_low  Epeak_90err_hi  Norm       Nomr_90err_low    Norm_90err_hi    chi2    dof
PL      -2.011    -0.376      0.338       -           -               -         3.55e-04     -9.36e-05          9.10e-05      53.840   57
CPL     -0.234    -1.747      3.382       35.537     -10.673       -35.537      4.74e-03     -4.74e-03          8.73e-01      51.500   56
 
 
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: PL)
 
Model Ph_index Ph_90err_low Ph_90err_hi  Epeak  Epeak_90err_low  Epeak_90err_hi  Norm       Nomr_90err_low    Norm_90err_hi    chi2    dof
PL      -0.980     -0.242     0.255       -           -               -         1.39e-02     -1.81e-03          1.80e-03      53.460   57
CPL     -0.991     -0.229     0.413     9999.360    -9999.360      -9999.360      1.40e-02     -1.40e-02          6.02e-03      53.510   56
 
 
=== 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         PL   1.11e-07  1.49e-07  1.48e-07  2.65e-07  4.94e-07  6.73e-07   erg/cm2
      90%_error_low -2.72e-08 -3.01e-08 -5.01e-08 -1.40e-07 -1.19e-07 -2.12e-07   erg/cm2
      90%_error_hi   2.79e-08  2.97e-08  5.36e-08  2.19e-07  1.25e-07  2.75e-07   erg/cm2
Peak flux       PL   3.48e-01  4.78e-01  4.85e-01  8.93e-01  1.60e+00  2.20e+00   ph/cm2/s
      90%_error_low -9.47e-02 -8.11e-02 -7.03e-02 -2.62e-01 -2.11e-01 -3.18e-01   ph/cm2/s
      90%_error_hi   1.03e-01  7.81e-02  6.90e-02  3.34e-01  2.11e-01  3.37e-01   ph/cm2/s
 
Fluence        CPL   1.05e-07  1.81e-07  1.06e-07  1.41e-08  4.04e-07  4.06e-07   erg/cm2
      90%_error_low -3.04e-08 -2.57e-08 -7.28e-08 -1.39e-08 -1.06e-07 -1.07e-07   erg/cm2
      90%_error_hi   3.01e-08  4.70e-08  7.84e-08  3.12e-07  1.52e-07  3.56e-07   erg/cm2
Peak flux      CPL   3.48e-01  4.74e-01  4.85e-01  8.86e-01  1.60e+00  2.32e+00   ph/cm2/s
      90%_error_low -9.51e-02 -7.63e-02 -7.04e-02     N/A   -2.11e-01 -5.02e-01   ph/cm2/s
      90%_error_hi   1.02e-01  8.30e-02  6.91e-02     N/A    2.11e-01  1.75e-01   ph/cm2/s
 
======================================================================
  • Special notes of this burst




    Image

    Pre-slew 15.0-350.0 keV image (Event data)

    #   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
   58.1172   -55.9368   0.0234    28.5296   -84.0735         0.4341060      8.197 TRIG_00299787                 
 
Foreground time interval of the image:
 -0.144  16.197 (delta_t =  16.341 [sec])
Background time interval of the image:
-239.504  -0.144 (delta_t = 239.360 [sec])




    Light Curves

    Note: The mask-weighted lightcurves have units of either count/det or counts/sec/det, where a det is 0.4 x 0.4 = 0.16 sq cm.

    Full-time range; 1 s binning

    Bokeh Plot

    Other quick-look light curves:




    Spectra

    Notes:

    Time averaged spectrum fit using the average DRM

    Power-law model
    Time interval is from   -0.144 sec. to  150.552 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.01077     ( -0.376067   0.338226 )
Norm@50keV  : 3.55171E-04    ( -9.36572e-05   9.10167e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.84 using 59 PHA bins.
# Reduced chi-squared =         0.9446 for     57 degrees of freedom 
# Null hypothesis probability =   5.942644e-01
 
Photon flux (15-150 keV)    in 150.7 sec: 5.35453E-02 ( -0.0103566  0.0103605 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.93984e-07 ( -1.18594e-07  1.24763e-07 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -0.144 sec. to  150.552 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.234499     ( -1.78359   3.34608 )
Epeak [keV] : 35.5367      ( -10.5631 -35.4265 )
Norm@50keV  : 4.73765E-03    ( -0.00527313   0.872785 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.50 using 59 PHA bins.
# Reduced chi-squared =         0.9196 for     56 degrees of freedom 
# Null hypothesis probability =   6.457990e-01
 
Photon flux (15-150 keV)    in 150.7 sec: 5.10707E-02 ( -0.0102948  0.0105512 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.04328e-07 ( -1.05891e-07  1.51964e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from   -0.100 sec. to    0.900 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.980479     ( -0.241952   0.254928 )
Norm@50keV  : 1.38905E-02    ( -0.00180927   0.00180016 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.46 using 59 PHA bins.
# Reduced chi-squared =         0.9379 for     57 degrees of freedom 
# Null hypothesis probability =   6.086274e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.59768 ( -0.21059  0.21109 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.51273e-07 ( -2.18445e-08  2.20196e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -0.100 sec. to    0.900 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.990567     ( -0.229754   0.41182 )
Epeak [keV] : 9999.36      ( -9999.36 -9999.36 )
Norm@50keV  : 1.39889E-02    ( -0.0139861   0.00601846 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.51 using 59 PHA bins.
# Reduced chi-squared =         0.9556 for     56 degrees of freedom 
# Null hypothesis probability =   5.696523e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.59738 ( -0.21085  0.21088 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.51838e-07 ( -2.24899e-08  2.13549e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 142.48 sec.
Hardness ratio (energy fluence ratio) = 0.992659071879

    S(15-50 keV) vs. S(50-150 keV) plot 

    S(15-50 keV)  = 2.598167e-07
S(50-150 keV) = 2.3417467e-07

    The dash-dotted line and the dashed line traces the fluences calculated from the Band function with Epeak = 15 and 150 keV, respectively. Both lines assume a canonical values of alpha = -1 and beta = -2.5.




    Mask shadow pattern 

    IMX = 5.613099150980396E-02, IMY = 5.407194386117098E-01

    Spacecraft aspect plot

    Bright source in the pre-burst/pre-slew/post-slew images

    Pre-burst image of 15-350 keV band 

    Time interval of the image:
-239.504000 -0.144000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.3208 -40.5207    6.7  42.6 -176.6  -0.4387  -1.7    9.7	Vela X-1                      
150.3717 -34.3235    2.5  55.6  179.0   3.1399   4.6 ------	UNKNOWN

    Pre-slew background subtracted image of 15-350 keV band 

    Time interval of the image:
-0.144000 16.196600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.3534 -40.4696   17.7  42.6 -176.7  -0.0397  -0.6    9.5	Vela X-1                      
124.0725 -10.0562    2.3  44.6  136.3   0.6785   5.0 ------	UNKNOWN                       
 58.1172 -55.9367    1.4  28.5  -84.1   0.4341   8.2 ------	UNKNOWN                       
 68.5183 -64.5613    2.3  32.8 -101.9   0.3208   5.1 ------	UNKNOWN                       
156.8187 -63.4458    3.3  54.2 -144.9   0.6604   3.5 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
65.996600 811.396600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.4622 -40.4848    5.1  50.9  162.5   2.9275   2.2    5.2	Vela X-1                      
170.3895 -60.6771    3.8  51.8 -159.6  -3.0824  -3.0    3.9	Cen X-3                       
186.4499 -62.8348   13.3  54.6 -150.5  -1.4187  -0.9    6.9	GX 301-2                      
 36.6609 -15.3308    2.7  43.8   24.9   3.4368   4.3 ------	UNKNOWN                       
 78.2256 -38.6171    2.6  21.9  101.7   1.8001   4.4 ------	UNKNOWN                       
 30.5824 -41.6804    3.6  22.8   -7.4   1.1831   3.2 ------	UNKNOWN                       
  1.4180 -18.3898    3.1  56.4  -16.6   5.8250   3.7 ------	UNKNOWN                       
269.7577 -78.9401    2.4  43.8 -116.0   9.7592   4.7 ------	UNKNOWN