GRB140818B

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: Sat Oct  4 21:02:44 EDT 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger609885
======================================================================

  Trigger: 00609885      Segment: 000

  BAT Trigger Time: 430080268.928   [s; MET]
      Trigger Stop: 430080270.976   [s; MET]
               UTC: 2014-08-18T18:44:16.515620    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 271.147889570597   Dec: -1.36139902602599  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.63
     Image Trigger?:     NO
     Rate S/N Ratio:     10.8627804912002  [ if not an image trigger ]
     Image S/N Ratio:    7.63

  Analysis Position:   [ source = BAT ]
    RA: 271.147889570597   Dec: -1.36139902602599  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 271.175117118492   Dec: -1.35598151488953  [deg; J2000]  
        { 18h 04m 42.0s , -01d 21' 21.5" }
         +/- 2.51630366791278 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.29646611011694 [arcmin] (formal 1-sigma fit error)
    SNR: 8.13953764656927
 
  Angular difference between the analysis and refined position is 1.665226 arcmin
 
  Partial Coding Fraction: 0.3945312    [ including projection effects ]

  Duration
     T90: 31.5520000457764 +/- 16.0461414097757
        Measured from: -2.87199997901917
                   to: 28.6800000667572     [s; relative to TRIGTIME]
     T50: 9.60000002384186 +/- 5.56063881196498
        Measured from: -0.824000000953674
                   to: 8.77600002288818     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.308000028133392     
                   to: 1.30800002813339     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -3.31999999284744     
                   to: 31.944000005722     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.360988   0.391968   0.258527   0.006326
           0.062231   0.055280   0.045902   0.037637 [error]
 Peak      0.032646   0.043252   0.039740   0.009858
           0.010690   0.009967   0.008433   0.006533 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   35.264   -3.320   31.944
T90    31.552   -2.872   28.680
T50     9.600   -0.824    8.776
Peak    1.000    0.308    1.308
 
 
====== 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      -1.826    -0.281      0.271       -           -               -         2.00e-03     -3.31e-04          3.23e-04      43.800   57
CPL     -1.757    -0.879      1.184      163.936    -163.849      -163.936      2.18e-03     -1.37e-03          7.18e-03      43.790   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      -1.622     -0.378     0.367       -           -               -         8.25e-03     -1.95e-03          1.94e-03      40.380   57
CPL     -0.134     -1.529     2.214       66.591     -18.850      1144.879      4.25e-02     -4.25e-02          3.69e-01      37.640   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   1.23e-07  1.85e-07  2.08e-07  4.47e-07  6.50e-07  9.63e-07   erg/cm2
      90%_error_low -2.88e-08 -2.80e-08 -4.59e-08 -1.75e-07 -1.07e-07 -2.24e-07   erg/cm2
      90%_error_hi   3.04e-08  2.78e-08  4.59e-08  2.39e-07  1.08e-07  2.70e-07   erg/cm2
Peak flux       PL   3.81e-01  3.57e-01  2.32e-01  2.33e-01  1.07e+00  1.20e+00   ph/cm2/s
      90%_error_low -1.37e-01 -8.97e-02 -6.58e-02 -1.08e-01 -2.58e-01 -2.79e-01   ph/cm2/s
      90%_error_hi   1.54e-01  8.86e-02  6.49e-02  1.48e-01  2.60e-01  2.79e-01   ph/cm2/s
 
Fluence        CPL   1.22e-07  1.86e-07  2.09e-07  3.97e-07  6.46e-07  9.13e-07   erg/cm2
      90%_error_low -3.30e-08 -2.92e-08 -4.62e-08 -3.20e-07 -1.22e-07 -3.54e-07   erg/cm2
      90%_error_hi   3.23e-08  3.62e-08  4.76e-08  8.87e-08  1.11e-07  1.94e-07   erg/cm2
Peak flux      CPL   2.76e-01  3.97e-01  2.70e-01  8.08e-02  1.00e+00  1.02e+00   ph/cm2/s
      90%_error_low -1.59e-01 -1.07e-01 -8.12e-02 -8.08e-02 -2.64e-01 -2.75e-01   ph/cm2/s
      90%_error_hi   1.85e-01  1.10e-01  8.55e-02  1.76e-01  2.68e-01  2.99e-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
  271.1751    -1.3560   0.0236    38.2076    23.3026         0.9660601      8.140 TRIG_00609885                 
 
Foreground time interval of the image:
 -3.320  31.773 (delta_t =  35.093 [sec])
Background time interval of the image:
-239.928  -3.320 (delta_t = 236.608 [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   -3.320 sec. to   31.944 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.8258     ( -0.281262   0.270711 )
Norm@50keV  : 2.00366E-03    ( -0.000330858   0.000323488 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          43.80 using 59 PHA bins.
# Reduced chi-squared =         0.7684 for     57 degrees of freedom 
# Null hypothesis probability =   9.003222e-01
 
Photon flux (15-150 keV)    in 35.26 sec: 0.278925 ( -0.042983  0.043198 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.49997e-07 ( -1.06881e-07  1.0834e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from   -3.320 sec. to   31.944 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.75691     ( -0.878384   1.18519 )
Epeak [keV] : 163.936      ( -165.816 -165.902 )
Norm@50keV  : 2.18207E-03    ( -0.00136867   0.00717879 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          43.79 using 59 PHA bins.
# Reduced chi-squared =         0.7819 for     56 degrees of freedom 
# Null hypothesis probability =   8.822538e-01
 
Photon flux (15-150 keV)    in 35.26 sec: 0.278069 ( -0.044812  0.043813 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.46206e-07 ( -1.21566e-07  1.11031e-07 ) ergs/cm2

1-s peak spectrum fit

Power-law model

Time interval is from    0.308 sec. to    1.308 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.62162     ( -0.377977   0.366727 )
Norm@50keV  : 8.24701E-03    ( -0.00195057   0.00193854 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          40.38 using 59 PHA bins.
# Reduced chi-squared =         0.7083 for     57 degrees of freedom 
# Null hypothesis probability =   9.532043e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.06702 ( -0.257723  0.25991 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.69449e-08 ( -1.88364e-08  1.90062e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    0.308 sec. to    1.308 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.134342     ( -1.52891   2.21465 )
Epeak [keV] : 66.5915      ( -18.8571 1144.87 )
Norm@50keV  : 4.24501E-02    ( -0.0424277   0.369418 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          37.64 using 59 PHA bins.
# Reduced chi-squared =         0.6721 for     56 degrees of freedom 
# Null hypothesis probability =   9.717642e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.00465 ( -0.264071  0.2678 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.3156e-08 ( -1.87396e-08  1.93479e-08 ) ergs/cm2

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 31.552 sec.
Hardness ratio (energy fluence ratio) = 1.12836612824

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

S(15-50 keV)  = 3.073638e-07
S(50-150 keV) = 3.426408e-07

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 = 7.229298581073229E-01,

Spacecraft aspect plot

Bright

Pre-burst

 Time interval of the image: -239.928000 -3.320000

# RAcent #  [deg] 186.8463 -62.6371 244.9829 -15.6356 256.1601 -37.7975 256.5615 -36.4144 263.1551 -24.5866 264.5200 -44.3176 268.2186  -1.3102 270.2054 -25.2156 270.2914 -25.7174 274.0212 -14.0358 276.0171 -30.3704 285.1102 -24.9827 263.1421 -33.8343 262.8872  -1.2749 224.0738   2.2309 212.9280 -23.2788 219.9854  -7.2574

Pre-slew

 Time interval of the image: -3.320000 31.772590

# RAcent #  [deg] 186.6607 -62.8139 244.9447 -15.6131 256.0553 -37.6936 256.2496 -36.4550 263.1508 -24.8864 264.7319 -44.3004 268.2972  -1.4146 270.1236 -25.1008 270.4719 -25.8421 273.9328 -14.1884 276.0999 -30.3571 284.8672 -24.9294 263.0599 -33.6799 271.1752  -1.3560

Post-slew

 Time interval of the image: 93.172590 962.171200

# RAcent #  [deg] 244.9841 -15.6419 254.4437  35.3688 256.1003 -37.9443 256.6319 -36.3219 262.8818 -24.8677 264.6653 -44.3404 268.4857  -1.4937 270.2991 -25.0920 270.2713 -25.7528 274.0056 -14.0202 275.9112 -30.3691 285.0059 -25.0607 288.7821  10.9502 299.6542  35.2001 308.1082  40.9538 262.9507 -33.8935 294.3553 -36.0184 300.2434  25.1251 281.3026  18.9931 267.9598 -26.3513 290.9669  51.3911 UNKNOWN UNKNOWN

IMY = -3.113819056099733E-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] ['] 32.9 48.8 -142.7 -0.2274 -0.3 9.5 GX 301-2 0.2 24.9 -29.5 10.7180 51.3 0.3 Sco X-1 7.8 1.6 -94.4 0.3012 1.5 8.7 4U 1700-377 4.4 1.8 -44.7 0.5433 2.6 6.1 GX 349+2 0.0 13.7 21.5 0.0791 0.4 12.4 GX 1+4 5.2 8.2 148.3 0.4449 2.2 12.4 4U 1735-44 0.0 37.5 18.6 0.2256 0.8 12.4 SW J1753.5-0127 4.1 16.1 44.9 0.6119 3.0 9.2 GX 5-1 2.5 15.7 46.2 1.1888 5.9 1.7 GRS 1758-258 1.4 27.5 37.0 2.1352 8.4 0.9 GX 17+2 4.5 16.5 71.0 0.6185 2.6 4.8 H1820-303 7.5 26.1 70.8 0.4917 1.5 5.5 HT1900.1-2455 2.7 5.6 50.2 0.9069 4.3 7.6 GX 354-0 2.7 36.6 9.9 1.1731 4.3 ------ UNKNOWN 3.4 50.8 -44.3 3.7459 3.4 ------ UNKNOWN 2.0 41.1 -80.9 5.2480 5.9 ------ UNKNOWN 3.1 46.0 -56.5 3.9976 3.7 ------ UNKNOWN background subtracted image of 15-350 keV band DECcent POSerr Theta Phi PeakCts SNR AngSep Name [deg] ['] [deg] [deg] ['] 7.3 48.9 -142.9 0.2852 1.6 2.6 GX 301-2 6.2 24.9 -29.5 -0.1377 -1.9 2.6 Sco X-1 7.6 1.7 -90.6 -0.0918 -1.5 9.6 4U 1700-377 17.1 1.9 -50.8 -0.0402 -0.7 9.2 GX 349+2 5.5 13.4 21.8 0.1326 2.1 11.4 GX 1+4 6.7 8.3 147.4 -0.1088 -1.7 9.0 4U 1735-44 8.7 37.4 18.8 0.1437 1.3 4.8 SW J1753.5-0127 17.0 16.1 44.4 -0.0487 -0.7 8.8 GX 5-1 89.6 15.7 47.0 0.0091 0.1 10.9 GRS 1758-258 4.5 27.3 37.0 -0.2058 -2.6 10.1 GX 17+2 8.9 16.5 71.1 -0.0924 -1.3 9.1 H1820-303 82.3 26.0 70.4 0.0128 0.1 9.2 HT1900.1-2455 7.5 5.6 48.6 -0.0951 -1.5 9.9 GX 354-0 1.4 38.2 23.3 0.9653 8.1 ------ UNKNOWN image of 15-350 keV band DECcent POSerr Theta Phi PeakCts SNR AngSep Name [deg] ['] [deg] [deg] ['] 0.3 29.5 -134.7 31.7680 39.0 0.3 Sco X-1 2.9 39.9 -35.8 3.8617 4.0 1.7 Her X-1 9.5 39.1 -175.4 1.0429 1.2 8.1 4U 1700-377 0.0 37.5 -174.9 0.7656 0.9 11.3 GX 349+2 15.8 24.8 -176.2 0.4176 0.7 10.1 GX 1+4 4.1 43.4 172.4 -3.0739 -2.8 7.4 4U 1735-44 4.4 2.7 -107.3 1.3623 2.6 7.5 SW J1753.5-0127 3.4 23.7 167.6 2.1833 3.4 1.1 GX 5-1 3.9 24.4 167.6 1.8583 3.0 1.8 GRS 1758-258 0.9 13.0 153.2 6.4930 12.5 1.0 GX 17+2 7.3 29.4 157.3 1.2048 1.6 0.7 H1820-303 6.6 27.2 137.4 1.3491 1.8 8.6 HT1900.1-2455 0.6 21.4 40.2 11.8410 18.8 1.0 GRS 1915+105 2.6 45.2 19.0 5.7135 4.5 3.1 Cyg X-1 40.1 54.0 19.8 1.0799 0.3 0.1 Cyg X-3 4.6 33.4 178.1 1.7258 2.5 4.0 GX 354-0 2.5 40.8 136.5 6.3414 4.6 ------ UNKNOWN 3.6 38.7 30.5 3.2446 3.2 ------ UNKNOWN 2.5 22.7 11.3 2.3832 4.6 ------ UNKNOWN 2.5 25.2 172.4 2.8222 4.6 ------ UNKNOWN 2.4 55.4 0.6 11.0561 4.8 ------ 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