Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Wed Jan 22 21:05:47 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger148646
======================================================================

  Trigger: 00148646      Segment: 000

  BAT Trigger Time: 144670081.92   [s; MET]
      Trigger Stop: 144670082.944   [s; MET]
               UTC: 2005-08-02T10:08:02.266620    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 219.286638875251   Dec: 27.8064461097575  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.05
     Image Trigger?:     NO
     Rate S/N Ratio:     12.6491106406735  [ if not an image trigger ]
     Image S/N Ratio:    8.05

  Analysis Position:   [ source = BAT ]
    RA: 219.286638875251   Dec: 27.8064461097575  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 219.285082075551   Dec: 27.7948947026507  [deg; J2000]  
        { 14h 37m 08.4s , +27d 47' 41.6" }
         +/- 1.47258304828006 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.481713727930116 [arcmin] (formal 1-sigma fit error)
    SNR: 17.4986435504982
 
  Angular difference between the analysis and refined position is 0.697992 arcmin
 
  Partial Coding Fraction: 0.2246094    [ including projection effects ]

  Duration
     T90: 27.4560000300407 +/- 8.16495536398989
        Measured from: -2.19200000166893
                   to: 25.2640000283718     [s; relative to TRIGTIME]
     T50: 9.08799999952316 +/- 1.67992382883234
        Measured from: 0.624000012874603
                   to: 9.71200001239777     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.0280000269412994     
                   to: 1.0280000269413     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -3.40799999237061     
                   to: 30.0640000104904     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.749541   1.098914   1.004171   0.363800
           0.078709   0.084781   0.078416   0.071687 [error]
 Peak      0.046311   0.112950   0.103312   0.056736
           0.014531   0.015751   0.015598   0.013525 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   33.472   -3.408   30.064
T90    27.456   -2.192   25.264
T50     9.088    0.624    9.712
Peak    1.000    0.028    1.028
 
 
====== 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      -1.482    -0.139      0.138       -           -               -         6.93e-03     -5.51e-04          5.51e-04      53.040   57
CPL     -1.249    -0.306      0.574      175.560    -175.560      -175.560      8.93e-03     -2.46e-03          7.42e-03      52.460   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      -1.293     -0.249     0.254       -           -               -         2.23e-02     -3.42e-03          3.41e-03      51.710   57
CPL     -0.457     -0.946     1.489       99.755     -31.940       -99.755      5.57e-02     -3.54e-02          2.15e-01      50.100   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   2.91e-07  5.41e-07  7.75e-07  2.35e-06  2.21e-06  3.96e-06   erg/cm2
      90%_error_low -4.16e-08 -4.79e-08 -7.62e-08 -4.67e-07 -1.87e-07 -5.25e-07   erg/cm2
      90%_error_hi   4.35e-08  4.74e-08  7.55e-08  5.38e-07  1.88e-07  5.79e-07   erg/cm2
Peak flux       PL   7.54e-01  8.58e-01  7.00e-01  9.55e-01  2.66e+00  3.27e+00   ph/cm2/s
      90%_error_low -2.09e-01 -1.58e-01 -1.19e-01 -2.95e-01 -4.31e-01 -5.02e-01   ph/cm2/s
      90%_error_hi   2.30e-01  1.55e-01  1.17e-01  3.63e-01  4.34e-01  5.04e-01   ph/cm2/s
 
Fluence        CPL   2.77e-07  5.52e-07  7.94e-07  1.72e-06  2.19e-06  3.35e-06   erg/cm2
      90%_error_low -5.13e-08 -5.34e-08 -8.60e-08 -8.27e-07 -1.96e-07 -8.40e-07   erg/cm2
      90%_error_hi   4.85e-08  5.48e-08  8.84e-08  1.13e-06  1.95e-07  1.03e-06   erg/cm2
Peak flux      CPL   6.28e-01  9.15e-01  7.68e-01  4.56e-01  2.59e+00  2.77e+00   ph/cm2/s
      90%_error_low -2.53e-01 -1.80e-01 -1.49e-01 -2.88e-01 -4.42e-01 -5.50e-01   ph/cm2/s
      90%_error_hi   2.12e-01  1.88e-01  1.55e-01  6.29e-01  4.45e-01  7.99e-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
  219.2851    27.7949   0.0110    51.8737    -6.3870         3.3835223     17.499 TRIG_00148646                 
 
Foreground time interval of the image:
 -3.408  30.064 (delta_t =  33.472 [sec])
Background time interval of the image:
-71.019  -3.408 (delta_t =  67.611 [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   -3.408 sec. to   30.064 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.48168     ( -0.138809   0.138371 )
Norm@50keV  : 6.93346E-03    ( -0.000551449   0.000550851 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.04 using 59 PHA bins.
# Reduced chi-squared =         0.9305 for     57 degrees of freedom 
# Null hypothesis probability =   6.243914e-01
 
Photon flux (15-150 keV)    in 33.47 sec: 0.861390 ( -0.072636  0.072879 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.20849e-06 ( -1.86656e-07  1.87503e-07 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -3.408 sec. to   30.064 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.24892     ( -0.306486   0.57413 )
Epeak [keV] : 175.560      ( -175.56 -175.56 )
Norm@50keV  : 8.93286E-03    ( -0.002463   0.00742332 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.46 using 59 PHA bins.
# Reduced chi-squared =         0.9368 for     56 degrees of freedom 
# Null hypothesis probability =   6.095882e-01
 
Photon flux (15-150 keV)    in 33.47 sec: 0.851877 ( -0.075574  0.075752 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.18522e-06 ( -1.95669e-07  1.9477e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from    0.028 sec. to    1.028 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.2934     ( -0.248764   0.253933 )
Norm@50keV  : 2.23271E-02    ( -0.00342025   0.00341355 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.71 using 59 PHA bins.
# Reduced chi-squared =         0.9072 for     57 degrees of freedom 
# Null hypothesis probability =   6.731106e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.66051 ( -0.43108  0.43388 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.21014e-07 ( -3.53661e-08  3.55053e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from    0.028 sec. to    1.028 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.457112     ( -0.94586   1.48887 )
Epeak [keV] : 99.7549      ( -31.91 -99.7245 )
Norm@50keV  : 5.56602E-02    ( -0.0354087   0.215013 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.10 using 59 PHA bins.
# Reduced chi-squared =         0.8946 for     56 degrees of freedom 
# Null hypothesis probability =   6.967713e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.58656 ( -0.44192  0.44456 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.12917e-07 ( -3.91129e-08  3.79249e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 27.456 sec.
Hardness ratio (energy fluence ratio) = 1.43235219236

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

    S(15-50 keV)  = 8.325174e-07
S(50-150 keV) = 1.3759959e-06

    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 = 1.266233766103257E+00, IMY = 1.417400962895539E-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:
-71.019400 -3.408000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
170.2701 -60.5353    5.1  45.2  179.2   0.4124   2.3    5.4	Cen X-3                       
186.6183 -62.6773    3.3  42.4  168.3   0.6467   3.5    5.7	GX 301-2                      
244.9854 -15.6433    1.8  39.1   64.5   2.1767   6.7    0.4	Sco X-1                       
220.8005 -72.4364    2.8  51.3  150.1   2.1056   4.1 ------	UNKNOWN                       
226.1013  27.4431    2.4  53.8    0.8   1.7199   4.8 ------	UNKNOWN                       
165.0318 -60.3300    2.8  47.1 -178.3   0.7560   4.1 ------	UNKNOWN                       
146.8285 -46.3098    2.1  51.9 -155.9   1.5466   5.4 ------	UNKNOWN                       
186.1361  25.6857    2.8  50.7  -44.6   2.1001   4.2 ------	UNKNOWN

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

    Time interval of the image:
-3.408000 30.064000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
169.9685 -60.6345    6.2  45.4  179.3   0.2732   1.9   10.2	Cen X-3                       
186.8988 -62.6651    4.2  42.3  168.1  -0.3983  -2.7    9.2	GX 301-2                      
244.9307 -15.7551    5.5  39.0   64.6   0.5506   2.1    7.4	Sco X-1                       
242.5938  15.5564    2.4  53.2   25.0   2.1717   4.8 ------	UNKNOWN                       
219.2851  27.7949    0.7  51.9   -6.4   3.3834  17.5 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
272.780600 302.090000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.5192  35.2774   15.7  30.8   52.7   0.0568   0.7    4.9	Her X-1                       
252.6389   9.0290    2.8  36.6  100.1   0.5515   4.1 ------	UNKNOWN                       
276.4918  62.8671    2.4  50.7   15.4   0.7449   4.7 ------	UNKNOWN                       
223.0159  41.8977    2.1  14.4   -3.1   0.2730   5.5 ------	UNKNOWN