Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Fri Jan 17 14:57:29 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger440955
======================================================================

  Trigger: 00440955      Segment: 000

  BAT Trigger Time: 314861240.256   [s; MET]
      Trigger Stop: 314861240.512   [s; MET]
               UTC: 2010-12-24T05:27:13.761240    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 285.926038610832   Dec: 45.7154744502681  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    9.17
     Image Trigger?:     NO
     Rate S/N Ratio:     18.4661853126194  [ if not an image trigger ]
     Image S/N Ratio:    9.17

  Analysis Position:   [ source = BAT ]
    RA: 285.926038610832   Dec: 45.7154744502681  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 285.939544758496   Dec: 45.7061061793522  [deg; J2000]  
        { 19h 03m 45.5s , +45d 42' 22.0" }
         +/- 2.09718152589513 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.905015927662979 [arcmin] (formal 1-sigma fit error)
    SNR: 10.5593782379298
 
  Angular difference between the analysis and refined position is 0.797593 arcmin
 
  Partial Coding Fraction: 0.5390625    [ including projection effects ]

  Duration
     T90: 0.24399995803833 +/- 0.042520585314364
        Measured from: 0.0360000133514404
                   to: 0.279999971389771     [s; relative to TRIGTIME]
     T50: 0.135999977588654 +/- 0.033941109986914
        Measured from: 0.0879999995231628
                   to: 0.223999977111816     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.337999999523163     
                   to: 0.662000000476837     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 0.0239999890327454     
                   to: 0.296000003814697     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.008106   0.031051   0.039613   0.017654
           0.004590   0.005382   0.005129   0.003901 [error]
 Peak      0.008687   0.036580   0.036461   0.016309
           0.007933   0.008644   0.007795   0.006652 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    0.272    0.024    0.296
T90     0.244    0.036    0.280
T50     0.136    0.088    0.224
Peak    1.000   -0.338    0.662
 
 
====== 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: 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      -1.046    -0.258      0.267       -           -               -         1.95e-02     -3.72e-03          3.70e-03      71.540   57
CPL      0.925    -1.235      1.803       95.869     -19.880        50.887      1.18e-01     -1.18e-01          3.42e-01      62.830   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      -0.710     -0.442     0.529       -           -               -         5.99e-03     -1.84e-03          1.75e-03      45.310   57
CPL     -0.047      0.047     2.642      175.865    -175.865      -175.865      1.15e-02     -7.09e-03          1.18e-01      44.900   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   4.42e-09  1.08e-08  2.08e-08  9.92e-08  5.64e-08  1.35e-07   erg/cm2
      90%_error_low -1.40e-09 -2.39e-09 -4.08e-09 -3.38e-08 -1.08e-08 -3.72e-08   erg/cm2
      90%_error_hi   1.57e-09  2.38e-09  4.05e-09  4.20e-08  1.08e-08  4.39e-08   erg/cm2
Peak flux       PL   1.16e-01  1.88e-01  2.30e-01  5.53e-01  6.92e-01  1.09e+00   ph/cm2/s
      90%_error_low -6.42e-02 -7.46e-02 -5.96e-02 -2.51e-01 -1.93e-01 -3.02e-01   ph/cm2/s
      90%_error_hi   8.31e-02  7.42e-02  5.95e-02  3.85e-01  1.96e-01  3.46e-01   ph/cm2/s
 
Fluence        CPL   2.38e-09  1.15e-08  2.74e-08  2.74e-08  5.80e-08  6.86e-08   erg/cm2
      90%_error_low -1.49e-09 -3.32e-09 -5.80e-09 -1.47e-08 -1.13e-08 -1.79e-08   erg/cm2
      90%_error_hi   1.87e-09  3.06e-09  6.08e-09  2.92e-08  1.12e-08  2.90e-08   erg/cm2
Peak flux      CPL   9.65e-02  1.93e-01  2.49e-01  3.03e-01  6.79e-01  8.40e-01   ph/cm2/s
      90%_error_low -9.65e-02 -8.23e-02 -7.28e-02 -3.03e-01 -1.93e-01 -3.16e-01   ph/cm2/s
      90%_error_hi   9.57e-02  8.48e-02  8.00e-02  3.27e-01  1.98e-01  4.22e-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
  285.9395    45.7061   0.0183    27.1393    47.5341         0.1030458     10.559 TRIG_00440955                 
 
Foreground time interval of the image:
  0.024   0.296 (delta_t =   0.272 [sec])
Background time interval of the image:
-239.256   0.024 (delta_t = 239.280 [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    0.024 sec. to    0.296 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.04639     ( -0.258725   0.266018 )
Norm@50keV  : 1.94644E-02    ( -0.00372087   0.00370128 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          71.54 using 59 PHA bins.
# Reduced chi-squared =          1.255 for     57 degrees of freedom 
# Null hypothesis probability =   9.314857e-02
 
Photon flux (15-150 keV)    in 0.272 sec: 2.24713 ( -0.43777  0.44047 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.63505e-08 ( -1.079e-08  1.0803e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from    0.024 sec. to    0.296 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.925316     ( -1.23569   1.80295 )
Epeak [keV] : 95.8691      ( -19.8722 50.8952 )
Norm@50keV  : 0.117748    ( -0.11779   0.341803 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          62.83 using 59 PHA bins.
# Reduced chi-squared =          1.122 for     56 degrees of freedom 
# Null hypothesis probability =   2.471781e-01
 
Photon flux (15-150 keV)    in 0.272 sec: 2.17796 ( -0.43671  0.44287 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.79548e-08 ( -1.12879e-08  1.12425e-08 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from   -0.338 sec. to    0.662 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.710471     ( -0.441991   0.528628 )
Norm@50keV  : 5.98976E-03    ( -0.00184341   0.00174683 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          45.31 using 59 PHA bins.
# Reduced chi-squared =         0.7950 for     57 degrees of freedom 
# Null hypothesis probability =   8.678575e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.691797 ( -0.192518  0.196164 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.2778e-08 ( -1.92711e-08  1.93687e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -0.338 sec. to    0.662 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.0473288     ( 0.049171   2.64361 )
Epeak [keV] : 175.865      ( -176.029 -176.029 )
Norm@50keV  : 1.15173E-02    ( -0.00707609   0.11811 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          44.90 using 59 PHA bins.
# Reduced chi-squared =         0.8017 for     56 degrees of freedom 
# Null hypothesis probability =   8.562871e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.678908 ( -0.192978  0.198356 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.09137e-08 ( -2.12247e-08  2.01908e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = N/A sec.
Hardness ratio (energy fluence ratio) = N/A

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

    S(15-50 keV)  = N/A
S(50-150 keV) = N/A

    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 = 3.460763347837418E-01, IMY = -3.781281415607399E-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:
-239.256000 0.024000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4556  35.2211    5.5  37.6    1.8  -0.6155  -2.1    7.3	Her X-1                       
268.5421  -1.3839    0.0  31.7  -69.2   0.3098   0.9   11.2	SW J1753.5-0127               
274.1522 -14.0282    8.0  38.1  -90.7  -1.0463  -1.4    8.5	GX 17+2                       
288.8019  10.9382    0.6   9.3  -94.2   3.7388  18.7    0.5	GRS 1915+105                  
299.5910  35.2322    2.3  17.0   76.9   1.1889   5.0    1.8	Cyg X-1                       
308.0627  40.9638    2.3  25.2   85.8   1.5659   5.1    2.3	Cyg X-3                       
326.2311  38.3214    7.8  34.4  107.8   0.7757   1.5    2.8	Cyg X-2                       
242.3321   3.6175    2.7  51.9  -42.3   4.9761   4.4 ------	UNKNOWN                       
242.0702   3.6533    3.2  52.2  -42.1   4.4556   3.8 ------	UNKNOWN

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

    Time interval of the image:
0.024000 0.296000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.3331  35.2434    6.3  37.7    1.8  -0.0185  -1.9    8.5	Her X-1                       
268.2618  -1.4118    7.7  32.0  -68.9  -0.0153  -1.5    6.8	SW J1753.5-0127               
274.0472 -14.0031   27.9  38.2  -90.6   0.0070   0.4    3.1	GX 17+2                       
288.8512  10.7416    0.0   9.4  -95.0  -0.0141  -1.9   12.6	GRS 1915+105                  
299.4988  35.3334   23.2  17.1   76.6   0.0039   0.5    9.1	Cyg X-1                       
308.3618  40.9923    5.7  25.4   86.2   0.0207   2.0   11.6	Cyg X-3                       
326.1416  38.1167    0.0  34.3  108.1  -0.0006  -0.0   12.4	Cyg X-2                       
285.9395  45.7061    1.1  27.1   47.5   0.1031  10.6 ------	UNKNOWN                       
338.3057  -0.1028    2.5  48.3  166.8   0.0903   4.6 ------	UNKNOWN                       
263.4171  21.8690    2.0  27.9  -20.8   0.0419   5.8 ------	UNKNOWN                       
229.2339  27.4189    1.6  58.6  -10.4   0.2825   7.1 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
61.644600 962.789600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.6623  35.2444   12.5  25.7  -25.8  -0.4507  -0.9   11.6	Her X-1                       
288.8000  10.9387    0.8  34.8 -107.9  12.3897  13.7    0.4	GRS 1915+105                  
299.5806  35.1966    1.7  14.7 -152.3   3.2026   6.8    0.6	Cyg X-1                       
308.1409  40.9893    1.6  16.8  175.4   3.6373   7.0    2.6	Cyg X-3                       
326.0331  38.3131    4.7  30.4  166.7   1.6472   2.5    6.5	Cyg X-2                       
220.2148  21.2871    3.1  58.1  -14.3   9.5353   3.8 ------	UNKNOWN                       
220.7184  18.6301    3.0  59.6  -17.0  12.2976   3.9 ------	UNKNOWN                       
259.3733  11.5397    2.7  40.9  -61.0   6.4081   4.2 ------	UNKNOWN                       
251.3405   9.1650    3.9  47.0  -52.9   6.8963   3.0 ------	UNKNOWN                       
241.7345   9.7991    4.0  52.0  -42.3   8.3374   2.9 ------	UNKNOWN                       
278.9798   5.1757    3.4  41.0  -92.4   7.3041   3.4 ------	UNKNOWN