GRB110818A

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 21:19:33 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger500914
======================================================================

  Trigger: 00500914      Segment: 000

  BAT Trigger Time: 335392676.48   [s; MET]
      Trigger Stop: 335392688.64   [s; MET]
               UTC: 2011-08-18T20:37:49.205860    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 317.383618630044   Dec: -63.969654053451  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    14.23
     Image Trigger?:     NO
     Rate S/N Ratio:     16.0312195418814  [ if not an image trigger ]
     Image S/N Ratio:    14.23

  Analysis Position:   [ source = BAT ]
    RA: 317.383618630044   Dec: -63.969654053451  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 317.374860046834   Dec: -63.9817506970385  [deg; J2000]  
        { 21h 09m 30.0s , -63d 58' 54.3" }
         +/- 1.39182464551997 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.469336102327281 [arcmin] (formal 1-sigma fit error)
    SNR: 18.9669558665367
 
  Angular difference between the analysis and refined position is 0.761542 arcmin
 
  Partial Coding Fraction: 0.2929688    [ including projection effects ]

  Duration
     T90: 102.839999973774 +/- 18.0035651679316
        Measured from: -4.22400003671646
                   to: 98.6159999370575     [s; relative to TRIGTIME]
     T50: 38.2399999499321 +/- 4.92446506445906
        Measured from: 9.63599997758865
                   to: 47.8759999275208     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 27.2599999904633     
                   to: 28.2599999904633     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -14.1640000343323     
                   to: 117.391999959946     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.599737   2.253942   1.739122   0.395091
           0.131899   0.119664   0.101402   0.086022 [error]
 Peak      0.048173   0.043761   0.085043   0.014047
           0.012194   0.011431   0.010476   0.008440 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  131.556  -14.164  117.392
T90   102.840   -4.224   98.616
T50    38.240    9.636   47.876
Peak    1.000   27.260   28.260
 
 
====== 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      -1.581    -0.108      0.108       -           -               -         3.23e-03     -1.91e-04          1.91e-04      73.090   57
CPL     -1.469    -0.210      0.451      247.459    -247.459      -247.459      3.67e-03     -8.06e-04          2.32e-03      72.890   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      -1.110     -0.318     0.334       -           -               -         1.35e-02     -2.45e-03          2.40e-03      63.240   57
CPL     -0.876     -2.018     1.593      310.645    -310.645      -310.645      1.67e-02     -5.38e-03          4.14e-02      63.280   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   5.87e-07  1.03e-06  1.37e-06  3.75e-06  3.99e-06  6.74e-06   erg/cm2
      90%_error_low -6.40e-08 -6.73e-08 -1.02e-07 -5.85e-07 -2.47e-07 -6.56e-07   erg/cm2
      90%_error_hi   6.64e-08  6.68e-08  1.01e-07  6.55e-07  2.48e-07  7.09e-07   erg/cm2
Peak flux       PL   3.83e-01  4.87e-01  4.51e-01  7.33e-01  1.57e+00  2.05e+00   ph/cm2/s
      90%_error_low -1.40e-01 -1.17e-01 -8.08e-02 -2.58e-01 -2.98e-01 -3.53e-01   ph/cm2/s
      90%_error_hi   1.65e-01  1.15e-01  7.97e-02  3.36e-01  3.03e-01  3.57e-01   ph/cm2/s
 
Fluence        CPL   5.74e-07  1.04e-06  1.38e-06  3.18e-06  3.96e-06  6.18e-06   erg/cm2
      90%_error_low -7.99e-08 -7.43e-08 -1.09e-07 -1.41e-06 -2.73e-07 -1.43e-06   erg/cm2
      90%_error_hi   5.70e-08  7.71e-08  1.13e-07  7.15e-07  2.62e-07  8.01e-07   erg/cm2
Peak flux      CPL   3.73e-01  4.86e-01  4.55e-01  7.39e-01  1.56e+00  2.01e+00   ph/cm2/s
      90%_error_low -3.73e-01 -1.17e-01 -8.29e-02 -4.76e-01 -3.33e-01 -6.35e-01   ph/cm2/s
      90%_error_hi   1.71e-01  1.17e-01  1.15e-01  2.82e-01  3.07e-01  3.94e-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
  317.3749   -63.9818   0.0101    41.7686   154.1918         6.1354390     18.967 TRIG_00500914                 
 
Foreground time interval of the image:
-14.164 117.392 (delta_t = 131.556 [sec])
Background time interval of the image:
-143.579 -14.164 (delta_t = 129.415 [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  -14.164 sec. to  117.392 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.58146     ( -0.107752   0.107595 )
Norm@50keV  : 3.23498E-03    ( -0.000190983   0.000190734 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          73.09 using 59 PHA bins.
# Reduced chi-squared =          1.282 for     57 degrees of freedom 
# Null hypothesis probability =   7.409102e-02
 
Photon flux (15-150 keV)    in 131.6 sec: 0.413371 ( -0.026447  0.026565 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.99122e-06 ( -2.4713e-07  2.48099e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from  -14.164 sec. to  117.392 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.46875     ( -0.209885   0.451596 )
Epeak [keV] : 247.459      ( -247.851 -247.851 )
Norm@50keV  : 3.66704E-03    ( -0.000805351   0.00231686 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          72.89 using 59 PHA bins.
# Reduced chi-squared =          1.302 for     56 degrees of freedom 
# Null hypothesis probability =   6.423655e-02
 
Photon flux (15-150 keV)    in 131.6 sec: 0.410551 ( -0.028372  0.028084 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.96119e-06 ( -2.73144e-07  2.62347e-07 ) ergs/cm2

1-s peak spectrum fit

Power-law model

Time interval is from   27.260 sec. to   28.260 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.10998     ( -0.318428   0.334209 )
Norm@50keV  : 1.35121E-02    ( -0.00244752   0.00239838 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          63.24 using 59 PHA bins.
# Reduced chi-squared =          1.110 for     57 degrees of freedom 
# Null hypothesis probability =   2.654418e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.56886 ( -0.29784  0.30279 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.40841e-07 ( -2.4656e-08  2.47017e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   27.260 sec. to   28.260 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.1042     ( -2.00524   1.60532 )
Epeak [keV] : 9982.73      ( -9945.8 -9945.8 )
Norm@50keV  : 1.35836E-02    ( -0.00230401   0.044445 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          63.24 using 59 PHA bins.
# Reduced chi-squared =          1.129 for     56 degrees of freedom 
# Null hypothesis probability =   2.359791e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.56100 ( -0.33329  0.30734 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.40741e-07 ( -2.53239e-08  2.4136e-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 = -8.040348780338894E-01,

Spacecraft aspect plot

Bright

Pre-burst

 Time interval of the image: -143.579400 -14.164000

# RAcent #  [deg] 186.3239 -62.7620 244.9791 -15.6398 255.9411 -37.7875 256.5655 -36.3502 263.1174 -24.7446 264.9845 -44.5240 268.4106  -1.5157 270.2413 -24.9786 270.2718 -25.6941 273.9249 -14.0161 275.7726 -30.4415 284.9800 -24.8406 262.8081 -33.8471 292.1743 -26.2436 278.1896 -11.2532 292.4550 -53.9240 7.8273 -79.4914 25.0285 -79.2431 278.9292 -74.0923 255.1852 -41.6732 243.1483 -52.4012 UNKNOWN

Pre-slew

 Time interval of the image: -14.164000 117.392000

# RAcent #  [deg] 186.6431 -62.8257 244.9792 -15.6416 255.9631 -37.7362 256.4464 -36.4811 263.1976 -24.8382 264.5272 -44.4492 268.2749  -1.5072 270.2787 -24.9301 270.4642 -25.7160 274.1115 -14.1574 275.7982 -30.4865 285.0281 -25.0685 263.1201 -33.6582 268.2968  11.0475 317.3748 -63.9817 214.0730 -15.4829

Post-slew

 Time interval of the image: 364.220600 962.630600

# RAcent #  [deg] 255.9701 -37.8606 256.2684 -36.3854 263.1508 -24.7520 264.7929 -44.4324 270.4730 -25.0911 270.2994 -25.6459 275.8005 -30.3794 285.0595 -24.9608 262.9822 -33.8358 342.3995 -67.9758 47.0373 -35.6269 255.2031 -41.6368 243.1447 -52.4447 60.6016 -69.6942 237.2117 -46.7414 84.3683 -62.9635 90.4126 -63.3865

IMY = -3.888279892617332E-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] ['] 5.9 46.5 -134.4 -0.8144 -2.0 9.2 GX 301-2 0.3 26.7 -17.9 4.5786 36.3 0.0 Sco X-1 2.8 2.5 -13.4 0.5012 4.1 4.0 4U 1700-377 4.3 3.8 1.8 0.3241 2.7 7.7 GX 349+2 3.7 16.2 28.8 0.3713 3.1 5.9 GX 1+4 3.6 7.3 138.9 0.3920 3.2 11.3 4U 1735-44 3.3 39.9 26.7 0.7538 3.5 4.6 SW J1753.5-0127 3.4 18.7 48.8 0.4863 3.4 6.5 GX 5-1 3.5 18.1 50.2 0.4577 3.3 3.4 GRS 1758-258 2.6 30.0 43.1 0.7658 4.4 4.9 GX 17+2 3.7 18.0 72.2 0.4271 3.1 9.1 H1820-303 7.7 27.8 74.2 0.2729 1.5 5.7 HT1900.1-2455 9.1 7.7 46.5 0.1528 1.3 9.0 GX 354-0 2.6 32.1 84.3 1.1280 4.4 ------ UNKNOWN 2.5 34.3 47.6 1.0354 4.7 ------ UNKNOWN 2.1 27.3 141.2 0.8666 5.5 ------ UNKNOWN 2.9 54.2 176.9 1.8702 3.9 ------ UNKNOWN 2.9 56.9 178.9 3.0450 4.0 ------ UNKNOWN 2.8 35.5 179.0 0.6248 4.1 ------ UNKNOWN 1.7 2.1 -127.5 0.7892 6.9 ------ UNKNOWN 2.3 15.6 -137.6 0.6268 5.1 ------ UNKNOWN background subtracted image of 15-350 keV band DECcent POSerr Theta Phi PeakCts SNR AngSep Name [deg] ['] [deg] [deg] ['] 9.8 46.4 -134.5 0.5296 1.2 3.3 GX 301-2 477.4 26.7 -17.9 -0.0039 -0.0 0.1 Sco X-1 4.3 2.6 -12.6 -0.4042 -2.6 6.6 4U 1700-377 7.8 3.7 0.1 0.2296 1.5 3.5 GX 349+2 8.0 16.1 29.2 -0.2202 -1.5 11.7 GX 1+4 5.6 6.9 139.9 0.3215 2.1 9.2 4U 1735-44 5.8 39.9 26.5 -0.5869 -2.0 6.5 SW J1753.5-0127 5.1 18.8 48.8 -0.3937 -2.2 9.0 GX 5-1 7.2 18.2 50.7 -0.2781 -1.6 8.9 GRS 1758-258 13.0 29.9 43.6 0.2049 0.9 9.5 GX 17+2 4.7 18.0 72.4 -0.4444 -2.5 9.7 H1820-303 47.6 27.7 74.6 0.0596 0.2 8.9 HT1900.1-2455 6.4 8.0 47.2 0.2891 1.8 12.4 GX 354-0 2.0 52.2 22.9 4.3972 5.8 ------ UNKNOWN 0.6 41.8 154.2 6.1351 19.0 ------ UNKNOWN 2.3 44.8 -60.2 3.0860 5.0 ------ UNKNOWN image of 15-350 keV band DECcent POSerr Theta Phi PeakCts SNR AngSep Name [deg] ['] [deg] [deg] ['] 92.4 44.2 -7.0 0.0634 0.1 1.3 4U 1700-377 5.1 45.3 -5.6 1.2882 2.3 8.4 GX 349+2 4.9 52.5 8.9 2.3496 2.4 7.7 GX 1+4 2.7 35.0 -4.5 1.5854 4.3 2.4 4U 1735-44 3.2 49.3 16.4 3.1685 3.6 10.3 GX 5-1 6.5 48.8 15.9 1.4656 1.8 5.8 GRS 1758-258 3.1 42.5 19.2 1.9748 3.7 6.5 H1820-303 8.7 44.3 33.3 0.9949 1.3 2.7 HT1900.1-2455 12.9 44.5 2.9 -0.5096 -0.9 0.3 GX 354-0 2.6 10.9 -160.3 1.2861 4.4 ------ UNKNOWN 4.7 58.3 -175.7 6.2982 2.5 ------ UNKNOWN 1.1 41.4 -10.9 4.7939 10.9 ------ UNKNOWN 2.3 38.3 -31.6 2.1875 5.1 ------ UNKNOWN 3.2 36.1 -137.8 1.6660 3.6 ------ UNKNOWN 3.1 45.1 -30.5 2.1128 3.7 ------ UNKNOWN 3.6 47.1 -132.5 4.2072 3.2 ------ UNKNOWN 2.2 48.0 -129.0 8.8205 5.3 ------ 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