GRB111020A

Analysis Summary

Notes:

1) No attempt has been made to eliminate the non-significant decimal places.
2) This batgrbproduct analysis is done using the HEASARC data.
3) This batgrbproduct analysis is using the flight position for the mask-weighting calculation.

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Mon Jan 13 19:38:30 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger505926
======================================================================

  Trigger: 00505926      Segment: 000

  BAT Trigger Time: 340785236.544   [s; MET]
      Trigger Stop: 340785236.8   [s; MET]
               UTC: 2011-10-20T06:33:49.058300    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 287.026652923869   Dec: -37.9849220218857  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.92
     Image Trigger?:     NO
     Rate S/N Ratio:     18.7349939951952  [ if not an image trigger ]
     Image S/N Ratio:    8.92

  Analysis Position:   [ source = BAT ]
    RA: 287.026652923869   Dec: -37.9849220218857  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 287.026502922454   Dec: -38.0345928060899  [deg; J2000]  
        { 19h 08m 06.4s , -38d 02' 04.5" }
         +/- 2.04988437935127 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.02539436853358 [arcmin] (formal 1-sigma fit error)
    SNR: 10.9091449996154
 
  Angular difference between the analysis and refined position is 2.980255 arcmin
 
  Partial Coding Fraction: 0.7421875    [ including projection effects ]

  Duration
     T90: 0.38400000333786 +/- 0.0932952353877014
        Measured from: -0.00800001621246338
                   to: 0.375999987125397     [s; relative to TRIGTIME]
     T50: 0.17600005865097 +/- 0.0452548414137844
        Measured from: 0.0719999670982361
                   to: 0.248000025749207     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.316000044345856     
                   to: 0.683999955654144     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.0400000214576721     
                   to: 0.391999959945679     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.028389   0.037558   0.027089   0.009823
           0.005182   0.005215   0.004547   0.003492 [error]
 Peak      0.032269   0.034922   0.032326   0.007801
           0.007534   0.007194   0.006372   0.005159 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    0.432   -0.040    0.392
T90     0.384   -0.008    0.376
T50     0.176    0.072    0.248
Peak    1.000   -0.316    0.684
 
 
====== 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      -1.382    -0.263      0.265       -           -               -         1.50e-02     -2.23e-03          2.22e-03      52.100   57
CPL     -1.387    -0.257      0.742     9999.360    -9999.360      -9999.360      1.51e-02     -7.47e-03          1.88e-02      52.110   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      -1.416     -0.362     0.361       -           -               -         7.09e-03     -1.39e-03          1.37e-03      66.070   57
CPL     -1.420      N/A       N/A        9999.290      N/A           N/A         7.09e-03        N/A               N/A         66.080   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   7.43e-09  1.47e-08  2.25e-08  7.55e-08  6.30e-08  1.20e-07   erg/cm2
      90%_error_low -1.92e-09 -2.38e-09 -4.24e-09 -2.70e-08 -1.03e-08 -3.06e-08   erg/cm2
      90%_error_hi   2.05e-09  2.33e-09  4.17e-09  3.59e-08  1.04e-08  3.79e-08   erg/cm2
Peak flux       PL   2.69e-01  2.85e-01  2.13e-01  2.59e-01  8.66e-01  1.03e+00   ph/cm2/s
      90%_error_low -9.07e-02 -6.12e-02 -5.31e-02 -1.14e-01 -1.69e-01 -2.01e-01   ph/cm2/s
      90%_error_hi   1.00e-01  5.95e-02  5.18e-02  1.61e-01  1.70e-01  2.05e-01   ph/cm2/s
 
Fluence        CPL   7.51e-09  1.46e-08  2.23e-08  7.59e-08  6.36e-08  1.21e-07   erg/cm2
      90%_error_low    N/A    -2.43e-09    N/A       N/A    -1.42e-08 -5.31e-08   erg/cm2
      90%_error_hi     N/A     2.79e-09    N/A       N/A     9.72e-09  1.57e-08   erg/cm2
Peak flux      CPL   2.75e-01  2.85e-01  2.12e-01  2.76e-01  8.71e-01  1.03e+00   ph/cm2/s
      90%_error_low -1.07e-01 -6.07e-02 -5.19e-02     N/A   -1.84e-01 -2.74e-01   ph/cm2/s
      90%_error_hi   9.48e-02  6.37e-02  5.61e-02     N/A    1.73e-01  1.98e-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
  287.0265   -38.0346   0.0176    18.4199    68.6073         0.1063044     10.909 TRIG_00505926                 
 
Foreground time interval of the image:
 -0.040   0.392 (delta_t =   0.432 [sec])
Background time interval of the image:
-28.443  -0.040 (delta_t =  28.403 [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:

64 ms binning (zoomed)
16 ms binning (zoomed)
8 ms binning (zoomed)
2 ms binning (zoomed)
SN=5 or 10 s binning (full-time range)
Raw light curve

Spectra

Notes:

1) The fitting includes the systematic errors.
2) When the burst includes telescope slew time periods, the fitting uses an average response file made from multiple 5-s response files through out the slew time plus single time preiod for the non-slew times, and weighted by the total counts in the corresponding time period using addrmf. An average response file is needed becuase a spectral fit using the pre-slew DRM will introduce some errors in both a spectral shape and a normalization if the PHA file contains a lot of the slew/post-slew time interval.
3) For fits to more complicated models (e.g. a power-law over a cutoff power-law), the BAT team has decided to require a chi-square improvement of more than 6 for each extra dof.

Time averaged spectrum fit using the average DRM

Power-law model

Time interval is from   -0.040 sec. to    0.392 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.38215     ( -0.263305   0.264783 )
Norm@50keV  : 1.50394E-02    ( -0.00222714   0.00222054 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.10 using 59 PHA bins.
# Reduced chi-squared =         0.9141 for     57 degrees of freedom 
# Null hypothesis probability =   6.589261e-01
 
Photon flux (15-150 keV)    in 0.432 sec: 1.82427 ( -0.2761  0.27687 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.30193e-08 ( -1.02922e-08  1.03938e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.040 sec. to    0.392 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.38672     ( -0.258689   0.73964 )
Epeak [keV] : 9999.36      ( -9999.36 -9999.36 )
Norm@50keV  : 1.50521E-02    ( -0.00750681   0.018763 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.11 using 59 PHA bins.
# Reduced chi-squared =         0.9306 for     56 degrees of freedom 
# Null hypothesis probability =   6.228158e-01
 
Photon flux (15-150 keV)    in 0.432 sec: 1.83520 ( -0.35474  0.33364 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.36098e-08 ( -1.41874e-08  9.7222e-09 ) ergs/cm2

1-s peak spectrum fit

Power-law model

Time interval is from   -0.316 sec. to    0.684 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.4163     ( -0.36219   0.361069 )
Norm@50keV  : 7.08742E-03    ( -0.00138676   0.00137382 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          66.07 using 59 PHA bins.
# Reduced chi-squared =          1.159 for     57 degrees of freedom 
# Null hypothesis probability =   1.921262e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.866378 ( -0.16946  0.170122 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.82669e-08 ( -1.47982e-08  1.5082e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.316 sec. to    0.684 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.42041     (       )
Epeak [keV] : 9999.29      (   )
Norm@50keV  : 7.09116E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          66.08 using 59 PHA bins.
# Reduced chi-squared =          1.180 for     56 degrees of freedom 
# Null hypothesis probability =   1.678976e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.870838 ( -0.1843  0.173362 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.86167e-08 ( -1.62265e-08  1.52752e-08 ) ergs/cm2

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 0.384 sec.
Hardness ratio (energy fluence ratio) = 1.5346522642

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

S(15-50 keV)  = 2.2101546e-08
S(50-150 keV) = 4.091827e-08

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 = 1.214797225773311E-01,

Spacecraft aspect plot

Bright

Pre-burst

 Time interval of the image: -28.443410 -0.040000

# RAcent #  [deg] 170.4632 -60.7141 186.6168 -62.7648 244.9676 -15.6658 255.9384 -37.8365 256.6589 -36.3108 262.9394 -24.7449 264.8628 -44.6127 268.2596  -1.4409 270.2815 -25.1161 270.4337 -25.6188 274.1255 -13.8960 275.8708 -30.3318 285.1306 -25.0484 262.9807 -33.9852 312.4905 -32.4160 324.1864 -57.3348 292.8369 -38.1637 264.0920 -20.6490 242.3792 -39.1925

Pre-slew

 Time interval of the image: -0.040000 0.392000

# RAcent #  [deg] 170.0587 -60.7384 186.4401 -62.9406 245.0745 -15.5332 255.8045 -37.8039 256.2986 -36.2457 263.1363 -24.9131 264.8047 -44.4039 268.4608  -1.5929 270.3081 -24.9398 270.4510 -25.8630 274.1196 -13.9277 275.9558 -30.2194 285.1816 -24.8409 262.9658 -33.9833 287.0265 -38.0345 280.7747   8.4765 259.7095 -57.6366 255.8581 -54.3251

Post-slew

 Time interval of the image: 56.956590 962.509200

# RAcent #  [deg] 244.9805 -15.6280 255.9786 -37.7018 256.4338 -36.4189 263.1801 -24.7169 264.8478 -44.4743 268.3392  -1.3826 270.2880 -25.0944 270.2545 -25.8477 274.0334 -13.9871 275.8666 -30.3990 284.9828 -24.9839 288.7703  10.9522 262.9605 -33.8559 331.1911 -24.2418 303.1417  11.8093 287.9898  18.7815 287.8728   0.5837 282.1209  -3.2450 277.4181 -23.7721 159.9141 -79.0165 257.4512   9.0606 UNKNOWN

IMY = -3.100959680103157E-01 source in the pre-burst/pre-slew/post-slew images

image of 15-350 keV band DECcent POSerr Theta Phi PeakCts SNR AngSep Name [deg] ['] [deg] [deg] ['] 5.1 53.7 -150.9 0.5032 2.3 7.0 Cen X-3 1.8 45.9 -149.6 0.8096 6.2 1.1 GX 301-2 1.2 33.2 -43.2 0.7845 9.9 1.7 Sco X-1 2.6 9.2 -52.4 0.2384 4.5 2.3 4U 1700-377 0.0 10.1 -44.3 0.1207 2.3 12.7 GX 349+2 5.5 20.0 -11.1 -0.1207 -2.1 3.8 GX 1+4 3.9 0.6 71.5 0.1682 2.9 11.0 4U 1735-44 5.5 43.4 -2.0 0.2128 2.1 6.5 SW J1753.5-0127 3.8 20.2 8.4 0.1771 3.1 2.2 GX 5-1 3.5 19.8 9.1 0.2093 3.7 10.3 GRS 1758-258 6.8 32.0 10.6 0.1182 1.7 10.9 GX 17+2 4.3 17.1 28.8 0.1585 2.7 3.5 H1820-303 4.3 26.0 39.8 0.1895 2.7 9.2 HT1900.1-2455 5.7 10.8 -12.9 -0.1199 -2.0 9.0 GX 354-0 2.2 39.2 80.7 1.2463 5.2 ------ UNKNOWN 2.2 38.4 123.0 0.8038 5.4 ------ UNKNOWN 2.0 22.4 75.0 0.4153 5.8 ------ UNKNOWN 2.1 24.1 -8.0 0.3307 5.6 ------ UNKNOWN 2.4 17.0 -86.7 0.3069 4.8 ------ UNKNOWN background subtracted image of 15-350 keV band DECcent POSerr Theta Phi PeakCts SNR AngSep Name [deg] ['] [deg] [deg] ['] 5.7 53.9 -151.0 -0.0644 -2.0 10.2 Cen X-3 394.6 45.9 -149.9 -0.0005 -0.0 11.8 GX 301-2 9.2 33.3 -42.9 0.0137 1.3 8.4 Sco X-1 4.4 9.3 -52.8 0.0209 2.6 9.0 4U 1700-377 0.0 10.3 -45.5 0.0116 1.4 12.5 GX 349+2 0.0 19.8 -10.6 -0.0314 -4.0 12.2 GX 1+4 7.0 0.6 51.8 0.0125 1.6 3.8 4U 1735-44 10.0 43.3 -1.7 0.0155 1.2 10.1 SW J1753.5-0127 8.1 20.4 8.3 0.0119 1.4 8.5 GX 5-1 13.0 19.6 9.3 0.0071 0.9 10.8 GRS 1758-258 4.5 32.0 10.6 -0.0272 -2.5 9.3 GX 17+2 6.8 17.3 28.8 0.0139 1.7 9.0 H1820-303 11.4 26.2 39.6 -0.0101 -1.0 9.3 HT1900.1-2455 7.4 10.8 -12.9 0.0121 1.6 9.0 GX 354-0 1.1 18.4 68.6 0.1063 10.9 ------ UNKNOWN 2.3 55.3 12.1 0.2434 5.0 ------ UNKNOWN 2.2 13.2 -177.9 0.0397 5.3 ------ UNKNOWN 2.3 11.0 -162.2 0.0418 5.1 ------ UNKNOWN image of 15-350 keV band DECcent POSerr Theta Phi PeakCts SNR AngSep Name [deg] ['] [deg] [deg] ['] 1.6 43.1 -66.8 19.7329 7.2 0.7 Sco X-1 6.1 24.4 -95.3 1.3176 1.9 8.6 4U 1700-377 1.8 24.3 -92.1 4.2672 6.4 0.3 GX 349+2 8.0 24.2 -60.0 0.9224 1.5 9.5 GX 1+4 2.6 17.8 -114.7 2.3634 4.4 4.7 4U 1735-44 6.2 40.4 -25.9 1.4099 1.9 4.5 SW J1753.5-0127 1.8 19.2 -48.9 3.2052 6.6 0.9 GX 5-1 4.5 18.6 -50.6 1.2703 2.6 6.8 GRS 1758-258 1.9 26.6 -25.4 3.2555 6.0 3.4 GX 17+2 2.7 11.9 -50.1 2.0754 4.2 3.6 H1820-303 16.7 13.1 -4.4 0.3841 0.7 4.8 HT1900.1-2455 4.6 49.0 6.0 3.2450 2.5 1.7 GRS 1915+105 1.9 19.8 -81.6 3.2220 6.0 1.9 GX 354-0 3.3 39.8 86.6 10.0398 3.5 ------ UNKNOWN 3.1 52.0 23.9 11.8673 3.7 ------ UNKNOWN 2.9 56.8 4.8 15.1104 4.0 ------ UNKNOWN 1.7 38.6 5.1 5.0586 6.8 ------ UNKNOWN 2.6 35.0 -4.8 3.0651 4.5 ------ UNKNOWN 2.7 16.4 -29.0 2.1243 4.3 ------ UNKNOWN 2.6 59.1 -166.1 15.4787 4.4 ------ UNKNOWN 2.9 54.5 -33.0 10.3103 3.9 ------ UNKNOWN

Analysis Summary

Notes:

Image

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

Light Curves

Full-time range; 1 s binning

Other quick-look light curves:

64 ms binning (zoomed) 16 ms binning (zoomed) 8 ms binning (zoomed) 2 ms binning (zoomed) SN=5 or 10 s binning (full-time range) Raw light curve

Spectra

Notes:

Time averaged spectrum fit using the average DRM

Power-law model

Cutoff power-law model

1-s peak spectrum fit

Power-law model

Cutoff power-law model

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

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

Mask shadow pattern

Spacecraft aspect plot

Bright

64 ms binning (zoomed)
16 ms binning (zoomed)
8 ms binning (zoomed)
2 ms binning (zoomed)
SN=5 or 10 s binning (full-time range)
Raw light curve