Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Sat Mar 14 16:07:41 EDT 2015
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger632180
======================================================================

  Trigger: 00632180      Segment: 000

  BAT Trigger Time: 446317014.08   [s; MET]
      Trigger Stop: 446317015.104   [s; MET]
               UTC: 2015-02-22T16:56:40.858780    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 198.773581295466   Dec: -12.1368389920425  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    9.76
     Image Trigger?:     NO
     Rate S/N Ratio:     12.6095202129185  [ if not an image trigger ]
     Image S/N Ratio:    9.76

  Analysis Position:   [ source = BAT ]
    RA: 198.773581295466   Dec: -12.1368389920425  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 198.783748907258   Dec: -12.1491910085394  [deg; J2000]  
        { 13h 15m 08.1s , -12d 08' 57.1" }
         +/- 0.768320922170607 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.256795765636122 [arcmin] (formal 1-sigma fit error)
    SNR: 44.322971251086
 
  Angular difference between the analysis and refined position is 0.951295 arcmin
 
  Partial Coding Fraction: 0.4804688    [ including projection effects ]

  Duration
     T90: 15.8359999656677 +/- 6.8513079213452
        Measured from: 1.50400000810623
                   to: 17.339999973774     [s; relative to TRIGTIME]
     T50: 4.01599997282028 +/- 0.459860873151314
        Measured from: 4.94400000572205
                   to: 8.95999997854233     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 5.36800003051758     
                   to: 6.36800003051758     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 0.0640000104904175     
                   to: 28.1119999885559     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.972915   1.307170   0.924794   0.201714
           0.043751   0.045516   0.040322   0.033002 [error]
 Peak      0.124012   0.219376   0.173061   0.037760
           0.010575   0.011936   0.010755   0.008255 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   28.048    0.064   28.112
T90    15.836    1.504   17.340
T50     4.016    4.944    8.960
Peak    1.000    5.368    6.368
 
 
====== 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      -1.611    -0.076      0.075       -           -               -         8.30e-03     -3.51e-04          3.50e-04      59.790   57
CPL     -1.278    -0.288      0.309      110.361     -30.688       300.871      1.21e-02     -3.30e-03          4.94e-03      55.830   56
 
 
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: N/A)
 
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      -1.405     -0.106     0.106       -           -               -         3.85e-02     -2.43e-03          2.43e-03      77.850   57
CPL     -0.816     -0.430     0.475      104.317     -25.949       130.276      7.49e-02     -2.83e-02          5.15e-02      72.190   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   3.30e-07  5.66e-07  7.42e-07  1.97e-06  2.17e-06  3.61e-06   erg/cm2
      90%_error_low -2.41e-08 -2.49e-08 -4.10e-08 -2.27e-07 -9.77e-08 -2.59e-07   erg/cm2
      90%_error_hi   2.47e-08  2.49e-08  4.09e-08  2.47e-07  9.81e-08  2.74e-07   erg/cm2
Peak flux       PL   1.45e+00  1.54e+00  1.16e+00  1.43e+00  4.69e+00  5.58e+00   ph/cm2/s
      90%_error_low -1.58e-01 -1.07e-01 -8.92e-02 -2.12e-01 -3.02e-01 -3.57e-01   ph/cm2/s
      90%_error_hi   1.64e-01  1.06e-01  8.87e-02  2.34e-01  3.02e-01  3.58e-01   ph/cm2/s
 
Fluence        CPL   3.10e-07  5.83e-07  7.57e-07  1.22e-06  2.12e-06  2.87e-06   erg/cm2
      90%_error_low -2.93e-08 -2.88e-08 -4.40e-08 -3.91e-07 -1.09e-07 -4.05e-07   erg/cm2
      90%_error_hi   2.98e-08  2.92e-08  4.45e-08  6.17e-07  1.08e-07  6.17e-07   erg/cm2
Peak flux      CPL   1.29e+00  1.62e+00  1.23e+00  7.87e-01  4.58e+00  4.93e+00   ph/cm2/s
      90%_error_low -1.91e-01 -1.24e-01 -1.03e-01 -2.66e-01 -3.12e-01 -4.21e-01   ph/cm2/s
      90%_error_hi   1.97e-01  1.26e-01  1.05e-01  4.23e-01  3.13e-01  5.07e-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
  198.7837   -12.1492   0.0044    32.5868    35.3390         2.9112320     44.323 TRIG_00632180                 
 
Foreground time interval of the image:
  0.064  10.821 (delta_t =  10.757 [sec])
Background time interval of the image:
-239.080   0.064 (delta_t = 239.144 [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    0.064 sec. to   28.112 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.61101     ( -0.0757363   0.075347 )
Norm@50keV  : 8.29543E-03    ( -0.000350947   0.000350263 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.79 using 59 PHA bins.
# Reduced chi-squared =          1.049 for     57 degrees of freedom 
# Null hypothesis probability =   3.747330e-01
 
Photon flux (15-150 keV)    in 28.05 sec: 1.06970 ( -0.04657  0.04668 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.17357e-06 ( -9.77312e-08  9.80911e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from    0.064 sec. to   28.112 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.27787     ( -0.287996   0.30866 )
Epeak [keV] : 110.361      ( -30.6882 300.87 )
Norm@50keV  : 1.21142E-02    ( -0.00330188   0.00494191 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.83 using 59 PHA bins.
# Reduced chi-squared =         0.9970 for     56 degrees of freedom 
# Null hypothesis probability =   4.811548e-01
 
Photon flux (15-150 keV)    in 28.05 sec: 1.04853 ( -0.049812  0.04989 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.11945e-06 ( -1.0877e-07  1.08487e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from    5.368 sec. to    6.368 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.40531     ( -0.106148   0.105813 )
Norm@50keV  : 3.85027E-02    ( -0.00243488   0.00243197 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          77.85 using 59 PHA bins.
# Reduced chi-squared =          1.366 for     57 degrees of freedom 
# Null hypothesis probability =   3.467431e-02
 
Photon flux (15-150 keV)    in 1 sec: 4.69468 ( -0.30201  0.30237 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.71681e-07 ( -2.57655e-08  2.5904e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from    5.368 sec. to    6.368 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.816476     ( -0.429655   0.475043 )
Epeak [keV] : 104.317      ( -25.9489 130.276 )
Norm@50keV  : 7.49229E-02    ( -0.0282565   0.0514564 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          72.19 using 59 PHA bins.
# Reduced chi-squared =          1.289 for     56 degrees of freedom 
# Null hypothesis probability =   7.149436e-02
 
Photon flux (15-150 keV)    in 1 sec: 4.58416 ( -0.31241  0.31253 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.58542e-07 ( -2.78376e-08  2.78161e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 15.836 sec.
Hardness ratio (energy fluence ratio) = 1.30954391653

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

    S(15-50 keV)  = 8.960121e-07
S(50-150 keV) = 1.2775594e-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 = 5.214252454502871E-01, IMY = -3.697232123462328E-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:
-239.080000 0.064000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
244.9686 -15.6429    0.8  46.1  -36.0   6.4460  15.3    0.6	Sco X-1                       
254.4702  35.3175    6.6  41.2 -114.2   1.0932   1.7    1.6	Her X-1                       
200.0387  -3.7017    2.4  24.5   41.1   1.0370   4.9 ------	UNKNOWN                       
201.6901  34.0670    3.5  19.2  161.7   0.5943   3.3 ------	UNKNOWN                       
257.4479  41.7565    3.1  45.3 -122.2   3.2173   3.7 ------	UNKNOWN                       
254.1122   1.9143    3.7  43.7  -63.9   3.0290   3.1 ------	UNKNOWN

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

    Time interval of the image:
0.064000 10.820600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
244.8547 -15.5372    0.0  45.9  -36.0   0.0860   0.9    9.5	Sco X-1                       
254.3469  35.4536    6.3  41.2 -114.4   0.2328   1.8    8.6	Her X-1                       
198.7837 -12.1492    0.3  32.6   35.3   2.9111  44.3 ------	UNKNOWN                       
183.1238  51.8618    2.3  41.4  162.7   0.3578   5.0 ------	UNKNOWN                       
207.9237 -22.5778    2.1  40.3   16.4   0.3928   5.5 ------	UNKNOWN                       
244.7526  24.8400    2.6  30.9  -99.4   0.2748   4.4 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
76.020600 963.010000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
169.9543 -60.6527    8.9  52.9   -8.2   1.7450   1.3   10.8	Cen X-3                       
186.7045 -62.7668    2.4  51.4  -18.4   5.0174   4.7    1.3	GX 301-2                      
206.9332   3.4066    3.0  17.5 -177.4   1.6794   3.9 ------	UNKNOWN                       
246.0216  13.0399    2.9  53.2 -142.1  12.6198   4.0 ------	UNKNOWN