GRB151023A

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 Nov 16 01:18:01 EST 2015
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger661253
======================================================================

  Trigger: 00661253      Segment: 000

  BAT Trigger Time: 467300600.128   [s; MET]
      Trigger Stop: 467300601.152   [s; MET]
               UTC: 2015-10-23T13:43:04.815600    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 271.019585617029   Dec: -8.3228306705058  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.49
     Image Trigger?:     NO
     Rate S/N Ratio:     16.7332005306815  [ if not an image trigger ]
     Image S/N Ratio:    8.49

  Analysis Position:   [ source = BAT ]
    RA: 271.019585617029   Dec: -8.3228306705058  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 271.012509797461   Dec: -8.29311895355627  [deg; J2000]  
        { 18h 04m 03.0s , -08d 17' 35.2" }
         +/- 1.73990935619316 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.676165626112087 [arcmin] (formal 1-sigma fit error)
    SNR: 13.788242656085
 
  Angular difference between the analysis and refined position is 1.831532 arcmin
 
  Partial Coding Fraction: 0.8359375    [ including projection effects ]

  Duration
     T90: 10.7599999308586 +/- 4.3722653107991
        Measured from: -0.527999997138977
                   to: 10.2319999337196     [s; relative to TRIGTIME]
     T50: 3.23599994182587 +/- 1.22536527753205
        Measured from: 0.451999962329865
                   to: 3.68799990415573     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.236000001430511     
                   to: 1.23600000143051     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.984000027179718     
                   to: 12.1639999747276     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.222541   0.230564   0.085569   0.008733
           0.023553   0.021281   0.017556   0.015000 [error]
 Peak      0.054572   0.042738   0.024318   0.009152
           0.007010   0.006359   0.005290   0.004138 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   13.148   -0.984   12.164
T90    10.760   -0.528   10.232
T50     3.236    0.452    3.688
Peak    1.000    0.236    1.236
 
 
====== 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      -2.254    -0.239      0.222       -           -               -         2.13e-03     -3.46e-04          3.39e-04      56.250   57
CPL     -1.363    -0.789      1.282       27.306      N/A           N/A         7.40e-03        N/A               N/A         53.990   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      -2.040     -0.346     0.317       -           -               -         6.82e-03     -1.42e-03          1.34e-03      58.480   57
CPL     -2.062     -0.519     0.200       29.925      N/A           N/A         6.14e-03        N/A               N/A         58.000   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   7.30e-08  8.51e-08  7.14e-08  1.01e-07  2.66e-07  3.31e-07   erg/cm2
      90%_error_low -1.10e-08 -1.00e-08 -1.55e-08 -3.70e-08 -3.58e-08 -5.83e-08   erg/cm2
      90%_error_hi   1.13e-08  9.95e-09  1.62e-08  4.96e-08  3.68e-08  6.75e-08   erg/cm2
Peak flux       PL   4.73e-01  3.46e-01  1.68e-01  1.16e-01  1.04e+00  1.10e+00   ph/cm2/s
      90%_error_low -1.08e-01 -5.16e-02 -4.63e-02 -5.27e-02 -1.56e-01 -1.65e-01   ph/cm2/s
      90%_error_hi   1.13e-01  5.16e-02  4.71e-02  7.53e-02  1.56e-01  1.65e-01   ph/cm2/s
 
Fluence        CPL   6.90e-08  9.35e-08  6.40e-08  2.25e-08  2.43e-07  2.49e-07   erg/cm2
      90%_error_low -1.24e-08    N/A    -2.09e-08 -1.85e-08 -3.83e-08 -4.38e-08   erg/cm2
      90%_error_hi   1.23e-08    N/A     1.95e-08  7.83e-08  4.37e-08  9.23e-08   erg/cm2
Peak flux      CPL   4.48e-01  2.54e-01  1.52e-01  1.21e-01  9.66e-01  1.04e+00   ph/cm2/s
      90%_error_low -1.13e-01 -1.34e-01     N/A   -1.21e-01     N/A   -4.93e-01   ph/cm2/s
      90%_error_hi   1.60e-01  1.19e-01     N/A    3.01e-02     N/A    1.41e-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
  271.0125    -8.2931   0.0139    18.0224   133.0387         0.5888895     13.788 TRIG_00661253                 
 
Foreground time interval of the image:
 -0.984  12.164 (delta_t =  13.148 [sec])
Background time interval of the image:
-250.227  -0.984 (delta_t = 249.243 [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   -0.984 sec. to   12.164 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.25372     ( -0.238941   0.222453 )
Norm@50keV  : 2.13222E-03    ( -0.000346467   0.000339462 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.25 using 59 PHA bins.
# Reduced chi-squared =         0.9869 for     57 degrees of freedom 
# Null hypothesis probability =   5.030606e-01
 
Photon flux (15-150 keV)    in 13.15 sec: 0.363308 ( -0.040989  0.041001 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.65843e-07 ( -3.57752e-08  3.67827e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.984 sec. to   12.164 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.36334     ( -0.789284   1.28187 )
Epeak [keV] : 27.3063      (   )
Norm@50keV  : 7.39775E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.99 using 59 PHA bins.
# Reduced chi-squared =         0.9641 for     56 degrees of freedom 
# Null hypothesis probability =   5.513589e-01
 
Photon flux (15-150 keV)    in 13.15 sec: 0.351295 ( -0.042717  0.042953 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.42754e-07 ( -3.82954e-08  4.36739e-08 ) ergs/cm2

1-s peak spectrum fit

Power-law model

Time interval is from    0.236 sec. to    1.236 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.04033     ( -0.346018   0.317234 )
Norm@50keV  : 6.81711E-03    ( -0.00141991   0.00133567 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.48 using 59 PHA bins.
# Reduced chi-squared =          1.026 for     57 degrees of freedom 
# Null hypothesis probability =   4.207775e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.04208 ( -0.156199  0.15633 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.30347e-08 ( -1.15759e-08  1.19444e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    0.236 sec. to    1.236 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.36627     ( 0   0.718871 )
Epeak [keV] : 137.497      (   )
Norm@50keV  : 4.51184E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.89 using 59 PHA bins.
# Reduced chi-squared =         0.9980 for     56 degrees of freedom 
# Null hypothesis probability =   4.790081e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.966006 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 10.76 sec.
Hardness ratio (energy fluence ratio) = 0.83876447998

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

S(15-50 keV)  = 1.5815745e-07
S(50-150 keV) = 1.0768796e-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 = -2.220497500751255E-01,

Spacecraft aspect plot

Bright

Pre-burst

 Time interval of the image: -250.227400 -0.984000

# RAcent #  [deg] 244.9836 -15.6358 254.3811  35.3450 255.9868 -37.8209 256.5457 -36.4317 263.1716 -24.8571 264.6408 -44.5545 268.3521  -1.4794 270.3206 -25.0495 270.2116 -25.8267 274.1051 -13.8469 275.8865 -30.5437 285.1305 -24.7506 288.8002 263.0964 -33.7618 281.4067 -38.5847 264.5482  -9.1463 219.2044  29.4217

Pre-slew

 Time interval of the image: -0.984000 12.164000

# RAcent #  [deg] 244.8706 -15.8122 254.5506  35.5081 255.7753 -37.7294 256.2417 -36.3439 262.9793 -24.5969 264.6885 -44.4118 268.3379  -1.5679 270.1761 -25.2137 270.4721 -25.7951 274.1051 -13.8469 275.8081 -30.3943 285.0672 -24.8918 288.8741  10.8353 263.0303 -33.8395 283.5989  31.3347 271.0125  -8.2931

Post-slew

 Time interval of the image: 58.772590 962.959600

# RAcent #  [deg] 244.9865 -15.6358 254.3218  35.3718 256.0040 -37.8328 256.4441 -36.4198 263.0923 -24.8607 264.8215 -44.4985 268.3707  -1.4009 270.2456 -25.0874 270.2311 -25.7694 273.9864 -14.0243 275.8007 -30.3557 285.0648 -24.9896 288.8141  10.9691 263.1042 -33.8572 297.4870  35.0651 289.0975 -63.4700 266.1210  -0.2751 260.3800 -33.5172 244.8563  41.8386 230.5263 -39.9536 229.7104 -17.3933

IMY = -2.377966004227701E-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] ['] 0.4 18.5 -133.1 11.0989 31.5 0.4 Sco X-1 18.1 35.3 14.3 0.2845 0.6 3.7 Her X-1 1.6 37.9 -166.2 2.8908 7.4 1.4 4U 1700-377 2.4 36.5 -167.0 1.7747 4.8 5.4 GX 349+2 7.7 26.1 178.0 0.5462 1.5 11.1 GX 1+4 29.8 45.4 -174.5 -0.2530 -0.4 7.6 4U 1735-44 7.9 13.5 111.6 0.4829 1.5 1.9 SW J1753.5-0127 2.8 29.1 165.6 1.5532 4.1 2.7 GX 5-1 6.8 29.7 166.7 0.6407 1.7 7.0 GRS 1758-258 0.0 23.5 142.1 1.2588 3.4 12.8 GX 17+2 6.2 36.5 164.0 0.9773 1.9 10.8 H1820-303 8.6 38.3 147.7 -0.8509 -1.3 11.4 HT1900.1-2455 10.9400 750.8 35.3 86.0 0.0121 0.0 0.3 GRS 1915+105 5.9 34.6 -176.8 0.7639 2.0 6.9 GX 354-0 2.6 45.6 166.0 3.4907 4.4 ------ UNKNOWN 2.7 13.2 149.3 1.2805 4.3 ------ UNKNOWN 4.1 45.0 -30.9 1.8317 2.8 ------ UNKNOWN background subtracted image of 15-350 keV band DECcent POSerr Theta Phi PeakCts SNR AngSep Name [deg] ['] [deg] [deg] ['] 0.0 18.7 -133.1 0.0861 2.2 12.1 Sco X-1 5.4 35.5 14.6 -0.1185 -2.1 10.9 Her X-1 0.0 37.8 -165.9 -0.0244 -0.5 12.2 4U 1700-377 12.2 36.4 -166.6 0.0470 0.9 10.5 GX 349+2 5.4 25.8 178.2 0.0862 2.1 9.1 GX 1+4 10.1 45.3 -174.6 0.0812 1.1 3.3 4U 1735-44 6.3 13.5 112.0 -0.0725 -1.8 7.1 SW J1753.5-0127 53.0 29.2 166.1 -0.0103 -0.2 10.0 GX 5-1 65.8 29.8 166.2 -0.0083 -0.2 9.7 GRS 1758-258 0.0 23.5 142.1 -0.0686 -1.5 12.8 GX 17+2 3.7 36.3 163.9 0.1698 3.1 6.3 H1820-303 62.2 38.3 148.0 0.0131 0.2 2.4 HT1900.1-2455 22.0 35.4 86.2 -0.0525 -0.5 8.0 GRS 1915+105 5.9 34.7 -176.7 -0.0911 -1.9 2.1 GX 354-0 2.1 41.4 53.4 0.6702 5.5 ------ UNKNOWN 0.8 18.0 133.0 0.5888 13.8 ------ UNKNOWN image of 15-350 keV band DECcent POSerr Theta Phi PeakCts SNR AngSep Name [deg] ['] [deg] [deg] ['] 0.3 26.5 -99.8 39.8850 43.2 0.5 Sco X-1 8.7 46.4 -10.1 1.6773 1.3 6.9 Her X-1 1.7 32.5 -148.9 5.1757 7.0 1.1 4U 1700-377 1.2 31.1 -148.2 6.7184 9.3 0.5 GX 349+2 30.6 18.2 -147.7 0.2665 0.4 8.3 GX 1+4 3.9 36.6 -163.8 2.3502 3.0 4.4 4U 1735-44 14.2 7.4 -12.1 0.5171 0.8 3.1 SW J1753.5-0127 1.6 16.8 -168.9 4.5963 7.2 2.2 GX 5-1 2.3 17.5 -168.9 3.2066 5.0 4.2 GRS 1758-258 1.7 6.4 161.9 4.4165 6.8 1.3 GX 17+2 2.9 22.5 177.9 2.7838 4.0 6.5 H1820-303 7.4 21.4 151.6 -1.1561 -1.6 4.4 HT1900.1-2455 2.4 26.2 51.6 4.4522 4.9 1.7 GRS 1915+105 4.9 26.6 -156.4 1.7867 2.4 5.9 GX 354-0 3.7 50.1 37.2 11.5084 3.1 ------ UNKNOWN 4.2 56.7 179.2 14.4543 2.7 ------ UNKNOWN 2.5 9.4 -22.6 2.6133 4.5 ------ UNKNOWN 2.5 27.0 -151.5 3.0597 4.5 ------ UNKNOWN 2.9 55.6 -14.7 10.2328 4.0 ------ UNKNOWN 2.6 47.9 -129.2 13.7677 4.4 ------ UNKNOWN 4.1 41.2 -98.2 10.7274 2.8 ------ 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