GRB120811A

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 01:50:28 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger530581
======================================================================

  Trigger: 00530581      Segment: 000

  BAT Trigger Time: 366345328.448   [s; MET]
      Trigger Stop: 366345329.472   [s; MET]
               UTC: 2012-08-11T02:35:18.923980    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 257.18263991766   Dec: -22.7358138782081  [deg; J2000]

     Catalogged Source?: YES
     Point Source?:      YES
     GRB Indicated?:     NO    [ by BAT flight software ]
     Image S/N Ratio:    7.05
     Image Trigger?:     NO
     Rate S/N Ratio:     10.2469507659596  [ if not an image trigger ]
     Image S/N Ratio:    7.05

  Analysis Position:   [ source = BAT ]
    RA: 257.18263991766   Dec: -22.7358138782081  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 257.17947119836   Dec: -22.7233681892249  [deg; J2000]  
        { 17h 08m 43.1s , -22d 43' 24.1" }
         +/- 1.37791621551423 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.631614799157089 [arcmin] (formal 1-sigma fit error)
    SNR: 19.2410447641108
 
  Angular difference between the analysis and refined position is 0.767055 arcmin
 
  Partial Coding Fraction: 0.984375    [ including projection effects ]

  Duration
     T90: 29.0080000758171 +/- 4.93882578064389
        Measured from: -11.5760000348091
                   to: 17.432000041008     [s; relative to TRIGTIME]
     T50: 10.176000058651 +/- 2.17464663064374
        Measured from: -3.65600001811981
                   to: 6.52000004053116     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.427999973297119     
                   to: 1.42799997329712     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -14.1999999880791     
                   to: 22.1840000152588     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.570805   0.534398   0.295289   0.087234
           0.035646   0.031922   0.026555   0.022150 [error]
 Peak      0.050098   0.043567   0.024974  -0.000757
           0.006113   0.005699   0.004543   0.003844 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   36.384  -14.200   22.184
T90    29.008  -11.576   17.432
T50    10.176   -3.656    6.520
Peak    1.000    0.428    1.428
 
 
====== 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      -1.957    -0.137      0.134       -           -               -         2.25e-03     -1.84e-04          1.81e-04      51.540   57
CPL     -1.958    -0.137      0.135     9999.360      N/A           N/A         2.25e-03        N/A               N/A         51.540   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      -1.983     -0.273     0.255       -           -               -         6.60e-03     -1.16e-03          1.12e-03      63.330   57
CPL     -1.577     -0.809     1.216       44.605      N/A           N/A         1.12e-02        N/A               N/A         62.860   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   1.61e-07  2.24e-07  2.30e-07  4.34e-07  7.53e-07  1.05e-06   erg/cm2
      90%_error_low -1.72e-08 -1.53e-08 -2.60e-08 -9.30e-08 -5.88e-08 -1.20e-07   erg/cm2
      90%_error_hi   1.76e-08  1.53e-08  2.63e-08  1.10e-07  5.95e-08  1.32e-07   erg/cm2
Peak flux       PL   4.33e-01  3.28e-01  1.66e-01  1.20e-01  9.82e-01  1.05e+00   ph/cm2/s
      90%_error_low -8.64e-02 -4.52e-02 -3.77e-02 -4.57e-02 -1.36e-01 -1.45e-01   ph/cm2/s
      90%_error_hi   9.00e-02  4.52e-02  3.82e-02  6.04e-02  1.36e-01  1.46e-01   ph/cm2/s
 
Fluence        CPL   1.61e-07  2.24e-07  2.30e-07  4.37e-07  7.53e-07  1.05e-06   erg/cm2
      90%_error_low -1.73e-08 -1.52e-08 -2.60e-08 -6.99e-08 -6.35e-08 -2.71e-07   erg/cm2
      90%_error_hi   1.86e-08  1.53e-08  2.57e-08  6.35e-08  5.85e-08  6.97e-08   erg/cm2
Peak flux      CPL   4.15e-01  3.43e-01  1.66e-01  6.91e-02  9.67e-01  9.93e-01   ph/cm2/s
      90%_error_low -1.00e-01 -7.47e-02 -4.11e-02 -6.91e-02 -1.42e-01 -1.58e-01   ph/cm2/s
      90%_error_hi   9.75e-02  6.09e-02  4.06e-02  8.13e-02  1.42e-01  2.67e-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
  257.1795   -22.7234   0.0100    15.7422     9.0098         1.4662310     19.241 TRIG_00530581                 
 
Foreground time interval of the image:
-14.200  22.184 (delta_t =  36.384 [sec])
Background time interval of the image:
-87.347 -14.200 (delta_t =  73.147 [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  -14.200 sec. to   22.184 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.95746     ( -0.136902   0.133917 )
Norm@50keV  : 2.24746E-03    ( -0.000183531   0.000180831 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.54 using 59 PHA bins.
# Reduced chi-squared =         0.9042 for     57 degrees of freedom 
# Null hypothesis probability =   6.793818e-01
 
Photon flux (15-150 keV)    in 36.38 sec: 0.330716 ( -0.023204  0.023257 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.52735e-07 ( -5.87777e-08  5.95391e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from  -14.200 sec. to   22.184 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.95818     ( -0.136956   0.135131 )
Epeak [keV] : 9999.36      (   )
Norm@50keV  : 2.24711E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.54 using 59 PHA bins.
# Reduced chi-squared =         0.9203 for     56 degrees of freedom 
# Null hypothesis probability =   6.442980e-01
 
Photon flux (15-150 keV)    in 36.38 sec: 0.330773 ( -0.024578  0.023193 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.53084e-07 ( -6.35391e-08  5.84798e-08 ) ergs/cm2

1-s peak spectrum fit

Power-law model

Time interval is from    0.428 sec. to    1.428 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.98293     ( -0.272934   0.255271 )
Norm@50keV  : 6.60011E-03    ( -0.00115607   0.00112023 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          63.33 using 59 PHA bins.
# Reduced chi-squared =          1.111 for     57 degrees of freedom 
# Null hypothesis probability =   2.631113e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.982396 ( -0.13637  0.136444 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.08247e-08 ( -9.92561e-09  1.0169e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    0.428 sec. to    1.428 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.57675     ( -0.808686   1.21621 )
Epeak [keV] : 44.6045      (   )
Norm@50keV  : 1.12373E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          62.86 using 59 PHA bins.
# Reduced chi-squared =          1.123 for     56 degrees of freedom 
# Null hypothesis probability =   2.463216e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.966932 ( -0.141752  0.141558 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.8475e-08 ( -1.09327e-08  1.11684e-08 ) ergs/cm2

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 29.008 sec.
Hardness ratio (energy fluence ratio) = 1.02998258329

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

S(15-50 keV)  = 3.84392e-07
S(50-150 keV) = 3.683504e-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 = 2.784046720988066E-01,

Spacecraft aspect plot

Bright

Pre-burst

 Time interval of the image: -87.347400 -14.200000

# RAcent #  [deg] 186.6602 -62.7702 2700.0 244.9881 -15.6388 256.1597 -37.7584 256.3816 -36.2786 263.0226 -24.7347 264.5162 -44.4245 268.3854  -1.3042 270.0956 -24.9783 270.3182 -25.8417 274.0112 -13.9767 275.9568 -30.3062 285.0823 -25.0394 262.9151 -33.9671 197.4304 -50.6573

Pre-slew

 Time interval of the image: -14.200000 22.184000

# RAcent #  [deg] 186.7377 -62.9156 244.9268 -15.6843 255.8996 -38.0089 256.6138 -36.3755 263.0720 -24.7444 264.7484 -44.4558  819.6 268.3366  -1.4595 270.1268 -25.1188 270.0920 -25.6482 274.1167 -13.9259 275.7003 -30.2879 285.0859 -25.0480 263.0389 -33.6700 257.1794 -22.7233 318.6393 -86.0513 232.2167  10.3574 225.4834 -10.2061 157.1237 -76.5354 205.8196 -46.2124

Post-slew

 Time interval of the image: 250.452610 962.592000

# RAcent #  [deg] 244.9792 -15.6395 255.9225 -37.9437 256.2874 -36.5004 263.0575 -24.7257 264.7483 -44.2978 268.2874  -1.4384 270.2428 -25.1245 270.2996 -25.8977 274.0008 -14.0420 275.8607 -30.2697 284.8752 -24.8205 288.7698  10.9688 262.9551 -33.7403 278.9068   9.4178 317.6969 -75.9491 254.8599  31.0255 298.2055 -80.4641 255.2456 -41.6292 264.4983 -75.3105 251.3996 -45.6171 250.2803 -53.7272 UNKNOWN UNKNOWN UNKNOWN UNKNOWN

IMY = -4.414401037912250E-02 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] ['] 48.1 -132.9 -0.0001 -0.0 0.1 GX 301-2 0.4 25.5 -18.5 2.8726 31.6 0.5 Sco X-1 4.1 1.5 -52.3 -0.2670 -2.8 9.7 4U 1700-377 8.2 2.5 -18.1 0.1279 1.4 9.0 GX 349+2 347.4 14.4 30.5 -0.0030 -0.0 1.0 GX 1+4 3.1 7.8 154.0 0.3172 3.7 9.8 4U 1735-44 3.6 38.4 28.5 0.5190 3.2 9.0 SW J1753.5-0127 13.9 17.0 52.5 0.0859 0.8 11.9 GX 5-1 3.8 16.4 54.8 0.3106 3.1 6.0 GRS 1758-258 4.5 28.3 46.1 0.3074 2.5 3.6 GX 17+2 7.7 16.9 78.2 0.1501 1.5 4.0 H1820-303 5.3 26.6 79.2 0.2739 2.2 7.6 HT1900.1-2455 4.4 6.0 55.0 0.2314 2.6 8.8 GX 354-0 2.1 43.5 -115.2 2.2595 5.5 ------ UNKNOWN background subtracted image of 15-350 keV band DECcent POSerr Theta Phi PeakCts SNR AngSep Name [deg] ['] [deg] [deg] ['] 5.4 48.0 -133.1 0.6472 2.1 9.0 GX 301-2 2.8 25.5 -18.7 0.3214 4.2 4.0 Sco X-1 8.5 1.6 -63.4 -0.0948 -1.3 10.7 4U 1700-377 4.5 2.3 -15.2 0.1854 2.6 9.1 GX 349+2 17.9 14.4 30.7 0.0474 0.6 3.4 GX 1+4 7.9 153.2 0.0010 0.0 0.4 4U 1735-44 96.6 38.2 28.5 0.0155 0.1 1.9 SW J1753.5-0127 9.7 16.9 52.8 0.1013 1.2 8.9 GX 5-1 0.0 16.4 53.8 0.0976 1.2 12.7 GRS 1758-258 44.1 28.4 46.2 -0.0274 -0.3 9.3 GX 17+2 0.0 16.8 77.7 0.1675 2.0 12.6 H1820-303 5.4 26.6 79.2 -0.2221 -2.1 8.1 HT1900.1-2455 12.9 6.3 54.0 -0.0656 -0.9 10.2 GX 354-0 0.6 15.7 9.0 1.4665 19.2 ------ UNKNOWN 2.3 49.7 -173.0 0.8309 4.9 ------ UNKNOWN 3.3 54.4 -20.2 0.8301 3.5 ------ UNKNOWN 3.2 40.5 -42.9 0.4726 3.6 ------ UNKNOWN 2.4 55.2 -152.3 1.4787 4.8 ------ UNKNOWN 2.1 38.6 -107.4 1.0857 5.6 ------ UNKNOWN image of 15-350 keV band DECcent POSerr Theta Phi PeakCts SNR AngSep Name [deg] ['] [deg] [deg] ['] 0.2 22.6 -58.2 31.3352 55.5 0.0 Sco X-1 58.2 16.2 -135.0 -0.0918 -0.2 6.7 4U 1700-377 3.3 14.9 -132.4 1.6138 3.5 8.5 GX 349+2 3.4 3.6 -78.0 1.6019 3.4 2.9 GX 1+4 16.5 19.6 -163.1 0.3257 0.7 9.1 4U 1735-44 3.2 23.4 15.3 1.6982 3.6 4.9 SW J1753.5-0127 7.1 3.0 109.5 0.8285 1.6 3.5 GX 5-1 4.3 3.2 123.4 1.4034 2.7 9.3 GRS 1758-258 1.4 12.6 44.9 3.7994 8.3 0.4 GX 17+2 4.0 9.6 139.0 1.3321 2.9 6.7 H1820-303 67.4 16.2 106.0 -0.0883 -0.2 10.6 HT1900.1-2455 2.2 41.6 45.3 7.3470 5.3 2.2 GRS 1915+105 4.1 9.6 -147.4 1.3852 2.8 5.9 GX 354-0 2.5 36.1 32.3 3.3401 4.6 ------ UNKNOWN 4.2 56.9 179.1 10.1869 2.8 ------ UNKNOWN 3.3 57.0 -0.4 8.9417 3.5 ------ UNKNOWN 3.5 57.2 -173.8 8.3717 3.3 ------ UNKNOWN 2.2 19.5 -140.7 2.4753 5.2 ------ UNKNOWN 3.6 50.6 -167.1 4.4438 3.3 ------ UNKNOWN 2.1 24.3 -140.8 2.8093 5.4 ------ UNKNOWN 1.8 31.5 -148.9 3.6834 6.5 ------ 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