GRB091109A

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: Sun Jan 19 12:56:25 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger375246
======================================================================

  Trigger: 00375246      Segment: 000

  BAT Trigger Time: 279435468.608   [s; MET]
      Trigger Stop: 279435484.992   [s; MET]
               UTC: 2009-11-09T04:57:43.363760    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 309.264961145751   Dec: -44.1765036048656  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.64
     Image Trigger?:     NO
     Rate S/N Ratio:     13.5277492584687  [ if not an image trigger ]
     Image S/N Ratio:    7.64

  Analysis Position:   [ source = BAT ]
    RA: 309.264961145751   Dec: -44.1765036048656  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 309.252520677822   Dec: -44.1774300469834  [deg; J2000]  
        { 20h 37m 00.6s , -44d 10' 38.7" }
         +/- 2.09299540506235 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.09865328435654 [arcmin] (formal 1-sigma fit error)
    SNR: 10.5895617528812
 
  Angular difference between the analysis and refined position is 0.538210 arcmin
 
  Partial Coding Fraction: 0.1972656    [ including projection effects ]

  Duration
     T90: 48.0320000648499 +/- 16.9502235222856
        Measured from: 0.407999992370605
                   to: 48.4400000572205     [s; relative to TRIGTIME]
     T50: 15.1520000696182 +/- 8.93454955460532
        Measured from: 7.87999999523163
                   to: 23.0320000648499     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 8.2039999961853     
                   to: 9.2039999961853     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.839999973773956     
                   to: 51.7520000338554     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.557170   0.779658   0.692264   0.325297
           0.104882   0.104663   0.088659   0.075500 [error]
 Peak      0.021632   0.058814   0.046209   0.028349
           0.014465   0.014648   0.012649   0.010496 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   52.592   -0.840   51.752
T90    48.032    0.408   48.440
T50    15.152    7.880   23.032
Peak    1.000    8.204    9.204
 
 
====== 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      -1.306    -0.245      0.254       -           -               -         3.16e-03     -4.16e-04          4.13e-04      60.550   57
CPL     -1.318    -1.613      0.352     9999.360      N/A           N/A         3.16e-03        N/A               N/A         60.590   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      -1.358     -0.525     0.558       -           -               -         1.02e-02     -2.98e-03          2.97e-03      60.540   57
CPL     -1.251      1.251     1.854      375.151      N/A           N/A         1.14e-02        N/A               N/A         60.560   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   1.77e-07  3.66e-07  5.92e-07  2.15e-06  1.64e-06  3.28e-06   erg/cm2
      90%_error_low -4.80e-08 -6.15e-08 -8.76e-08 -6.64e-07 -2.19e-07 -7.12e-07   erg/cm2
      90%_error_hi   5.26e-08  5.94e-08  8.58e-08  8.55e-07  2.20e-07  8.65e-07   erg/cm2
Peak flux       PL   3.65e-01  4.00e-01  3.12e-01  4.00e-01  1.23e+00  1.48e+00   ph/cm2/s
      90%_error_low -1.94e-01 -1.49e-01 -1.03e-01 -2.22e-01 -3.90e-01 -4.30e-01   ph/cm2/s
      90%_error_hi   2.38e-01  1.42e-01  9.96e-02  3.49e-01  3.97e-01  4.30e-01   ph/cm2/s
 
Fluence        CPL   1.77e-07  3.66e-07  5.92e-07  2.19e-06  1.65e-06  3.25e-06   erg/cm2
      90%_error_low -4.83e-08 -6.15e-08    N/A    -1.09e-06 -2.25e-07 -9.09e-07   erg/cm2
      90%_error_hi   5.25e-08  5.93e-08    N/A     9.16e-07  2.14e-07  8.37e-07   erg/cm2
Peak flux      CPL   3.67e-01  3.98e-01  3.10e-01  4.22e-01  1.23e+00  1.50e+00   ph/cm2/s
      90%_error_low -2.17e-01 -1.47e-01 -1.02e-01     N/A   -4.05e-01 -4.59e-01   ph/cm2/s
      90%_error_hi   2.33e-01  1.58e-01  1.84e-01     N/A    3.95e-01  4.01e-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
  309.2525   -44.1774   0.0182    47.4042   162.8163         2.3124980     10.590 TRIG_00375246                 
 
Foreground time interval of the image:
 -0.840  51.752 (delta_t =  52.592 [sec])
Background time interval of the image:
-239.608  -0.840 (delta_t = 238.768 [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   -0.840 sec. to   51.752 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.30624     ( -0.245172   0.254288 )
Norm@50keV  : 3.16003E-03    ( -0.000415803   0.000413227 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.55 using 59 PHA bins.
# Reduced chi-squared =          1.062 for     57 degrees of freedom 
# Null hypothesis probability =   3.489874e-01
 
Photon flux (15-150 keV)    in 52.59 sec: 0.377440 ( -0.055098  0.055537 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.63992e-06 ( -2.1932e-07  2.19605e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.840 sec. to   51.752 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.17276     ( -0.758243   1.20683 )
Epeak [keV] : 63.9331      (   )
Norm@50keV  : 9.18171E-04    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.87 using 59 PHA bins.
# Reduced chi-squared =          1.069 for     56 degrees of freedom 
# Null hypothesis probability =   3.370578e-01
 
Photon flux (15-150 keV)    in 52.59 sec: 0.377431 ( -0.055148  0.055499 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.64522e-06 ( -2.25036e-07  2.13887e-07 ) ergs/cm2

1-s peak spectrum fit

Power-law model

Time interval is from    8.204 sec. to    9.204 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.35843     ( -0.524517   0.558068 )
Norm@50keV  : 1.01567E-02    ( -0.00298279   0.00296745 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.54 using 59 PHA bins.
# Reduced chi-squared =          1.062 for     57 degrees of freedom 
# Null hypothesis probability =   3.494930e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.22575 ( -0.390432  0.3973 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.90239e-08 ( -2.98806e-08  3.00564e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    8.204 sec. to    9.204 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -3.18195     ( 3.17314   3.77641 )
Epeak [keV] : 326.621      (   )
Norm@50keV  : 9.16063E-04    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.12 using 59 PHA bins.
# Reduced chi-squared =          1.074 for     56 degrees of freedom 
# Null hypothesis probability =   3.289239e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.22927 ( -0.405184  0.39524 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.92773e-08 ( -3.24629e-08  2.78269e-08 ) ergs/cm2

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 48.032 sec.
Hardness ratio (energy fluence ratio) = 1.6175218762

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

S(15-50 keV)  = 5.433047e-07
S(50-150 keV) = 1.0966102e-06

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 = -1.039103341736319E+00,

Spacecraft aspect plot

Bright

Pre-burst

 Time interval of the image: -239.608000 -0.840000

# RAcent #  [deg] 244.9770 -15.6503 254.5019  35.3677 256.0620 -37.7879 256.2874 -36.5046 262.9731 -24.7435 264.9519 -44.5922 268.4083  -1.4099 270.2870 -25.0634 270.3622 -25.7898 273.9395 -14.0026 276.0548 -30.2307 284.9754 -24.8595 288.7942  10.9415 299.6065  35.1927 262.8460 -33.8992 314.0305 -43.3670 277.4410 -54.2648 268.0519 -22.3357

Pre-slew

 Time interval of the image: -0.840000 51.752000

# RAcent #  [deg] 244.9728 -15.5200 254.3820  35.3024 255.9370 -37.9758 256.3212 -36.5497 262.9257 -24.7539 264.7509 -44.4845 268.2174  -1.4579 270.4428 -25.0781 270.4570 -25.7195 273.8731 -14.1624 276.0913 -30.4996 284.8921 -24.9802 288.9140  10.8133 299.5851  35.2816 263.1316 -33.7305 309.2525 -44.1774 304.4269 -48.0941 281.7239 -32.6978 273.7324 -27.0091

Post-slew

 Time interval of the image: 134.692600 790.392600

# RAcent #  [deg] 256.1101 -37.7655 256.2038 -36.4581 263.0722 -24.6383 264.8221 -44.4876 270.2760 -25.0966 270.4512 -25.7989 274.0915 -14.1676 275.9619 -30.3830 285.1955 -24.9111 288.8070  10.9631 263.0949 -33.9910 336.3924  -4.3431 331.3216  -7.0601 49.2903 -68.6957 123.3098 -77.1804 268.0691 -22.3326 253.8675 -38.8564

IMY = -3.213317189307310E-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] ['] 0.7 37.4 -100.8 8.3701 15.6 0.6 Sco X-1 2.2 46.4 -20.1 2.3577 5.3 2.6 Her X-1 8.0 41.0 -139.2 0.5264 1.4 4.9 4U 1700-377 5.5 39.9 -138.1 -0.7222 -2.1 8.7 GX 349+2 1.8 27.3 -131.8 1.6844 6.4 2.0 GX 1+4 17.0 43.2 -153.0 -0.2398 -0.7 12.4 4U 1735-44 3.0 12.9 -69.5 0.7722 3.9 3.5 SW J1753.5-0127 2.7 23.7 -144.8 0.9035 4.3 1.0 GX 5-1 3.1 24.3 -145.8 0.7790 3.8 4.3 GRS 1758-258 2.9 12.4 -135.7 0.7416 4.0 4.4 GX 17+2 4.5 26.9 -160.2 0.5563 2.6 10.6 H1820-303 4.3 21.4 -179.5 0.5661 2.7 4.9 HT1900.1-2455 0.5 16.6 37.6 4.9533 23.1 0.3 GRS 1915+105 0.8 42.7 32.7 6.6648 15.1 1.0 Cyg X-1 13.0 34.6 -142.6 -0.2245 -0.9 8.1 GX 354-0 2.4 49.2 158.7 3.2621 4.9 ------ UNKNOWN 3.6 50.6 -167.0 1.4865 3.2 ------ UNKNOWN 0.5 22.4 -136.7 4.5234 21.9 ------ UNKNOWN background subtracted image of 15-350 keV band DECcent POSerr Theta Phi PeakCts SNR AngSep Name [deg] ['] [deg] [deg] ['] 7.8 37.4 -100.6 0.3071 1.5 7.2 Sco X-1 8.9 46.4 -20.2 0.2273 1.3 4.4 Her X-1 21.5 41.2 -139.2 0.0809 0.5 8.2 4U 1700-377 3.8 39.9 -138.2 0.4306 3.0 9.4 GX 349+2 3.6 27.3 -131.7 -0.3187 -3.2 4.6 GX 1+4 370.1 43.2 -152.7 -0.0047 -0.0 2.1 4U 1735-44 4.8 13.1 -69.9 0.2019 2.4 9.0 SW J1753.5-0127 9.0 23.6 -145.1 0.1159 1.3 8.6 GX 5-1 6.1 24.2 -145.9 -0.1709 -1.9 8.5 GRS 1758-258 49.4 12.6 -135.8 -0.0186 -0.2 10.8 GX 17+2 10.6 27.1 -160.3 0.0975 1.1 11.7 H1820-303 11.3 21.5 -179.2 0.0836 1.0 8.6 HT1900.1-2455 84.2 16.5 38.2 -0.0124 -0.1 10.5 GRS 1915+105 11.3 42.7 32.6 0.1962 1.0 4.8 Cyg X-1 6.5 34.3 -142.7 0.1915 1.8 9.5 GX 354-0 1.1 47.4 162.8 2.3119 10.6 ------ UNKNOWN 2.0 48.6 169.5 1.2366 5.7 ------ UNKNOWN 2.0 28.9 -170.9 0.4902 5.7 ------ UNKNOWN 2.3 24.3 -153.7 0.4050 4.9 ------ UNKNOWN image of 15-350 keV band DECcent POSerr Theta Phi PeakCts SNR AngSep Name [deg] ['] [deg] [deg] ['] 9.1 39.9 -90.8 2.0286 1.3 7.5 4U 1700-377 0.0 40.5 -88.9 0.0331 0.0 11.4 GX 349+2 5.7 42.1 -69.0 3.4209 2.0 7.3 GX 1+4 12.2 31.4 -97.5 0.5495 0.9 4.1 4U 1735-44 2.4 36.8 -62.9 3.3948 4.8 1.1 GX 5-1 5.8 36.3 -63.6 1.3906 2.0 8.7 GRS 1758-258 9.2 42.3 -47.0 0.9979 1.3 9.3 GX 17+2 4.0 29.6 -64.6 1.4073 2.9 2.1 H1820-303 13.2 27.4 -44.4 0.3351 0.9 8.7 HT1900.1-2455 2.2 58.2 -14.8 9.7691 5.4 1.2 GRS 1915+105 515.1 36.7 -81.1 -0.0198 -0.0 10.8 GX 354-0 2.8 46.4 47.9 7.1733 4.1 ------ UNKNOWN 3.3 41.8 43.0 3.2766 3.5 ------ UNKNOWN 3.6 52.9 162.4 5.7250 3.2 ------ UNKNOWN 3.0 58.6 -172.5 10.1577 3.8 ------ UNKNOWN 0.9 40.2 -61.8 11.4487 12.5 ------ UNKNOWN 2.5 41.0 -93.5 7.2186 4.5 ------ 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