GRB121123A

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 12 23:23:22 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger539358
======================================================================

  Trigger: 00539358      Segment: 000

  BAT Trigger Time: 375357771.2   [s; MET]
      Trigger Stop: 375357779.392   [s; MET]
               UTC: 2012-11-23T10:02:41.294660    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 307.361694621078   Dec: -11.8596197133855  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.11
     Image Trigger?:     NO
     Rate S/N Ratio:     8.42614977317636  [ if not an image trigger ]
     Image S/N Ratio:    8.11

  Analysis Position:   [ source = BAT ]
    RA: 307.361694621078   Dec: -11.8596197133855  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 307.323808221708   Dec: -11.8793652854419  [deg; J2000]  
        { 20h 29m 17.7s , -11d 52' 45.7" }
         +/- 1.86146283966942 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.710702862384076 [arcmin] (formal 1-sigma fit error)
    SNR: 12.5202250669747
 
  Angular difference between the analysis and refined position is 2.520387 arcmin
 
  Partial Coding Fraction: 0.8203125    [ including projection effects ]

  Duration
     T90: 326.091999948025 +/- 14.2908306292774
        Measured from: 42.6520000100136
                   to: 368.743999958038     [s; relative to TRIGTIME]
     T50: 61.9799998998642 +/- 2.93678736045599
        Measured from: 214.54800003767
                   to: 276.527999937534     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 232.56400001049     
                   to: 233.56400001049     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -6.24000000953674     
                   to: 419.227999985218     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     6.675278   9.316128   5.839570   0.842123
           0.131380   0.134607   0.120349   0.111572 [error]
 Peak      0.059059   0.124286   0.104406   0.027590
           0.007220   0.008095   0.007528   0.005937 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  425.468   -6.240  419.228
T90   326.092   42.652  368.744
T50    61.980  214.548  276.528
Peak    1.000  232.564  233.564
 
 
====== 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: CPL)
 
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      -1.724    -0.042      0.042       -           -               -         3.37e-03     -7.55e-05          7.54e-05      91.470   57
CPL     -0.987    -0.195      0.204       69.867      -5.441         8.029      7.65e-03     -1.46e-03          1.90e-03      44.560   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      -1.198     -0.126     0.127       -           -               -         2.04e-02     -1.53e-03          1.53e-03      65.150   57
CPL     -0.633     -0.508     0.578      127.102     -40.147       507.407      3.84e-02     -1.63e-02          3.35e-02      61.510   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   2.26e-06  3.62e-06  4.38e-06  1.04e-05  1.32e-05  2.06e-05   erg/cm2
      90%_error_low -9.42e-08 -8.80e-08 -1.28e-07 -6.61e-07 -3.06e-07 -7.44e-07   erg/cm2
      90%_error_hi   9.57e-08  8.78e-08  1.28e-07  6.91e-07  3.06e-07  7.67e-07   erg/cm2
Peak flux       PL   6.30e-01  7.59e-01  6.61e-01  9.88e-01  2.40e+00  3.04e+00   ph/cm2/s
      90%_error_low -8.47e-02 -6.46e-02 -5.86e-02 -1.71e-01 -1.81e-01 -2.43e-01   ph/cm2/s
      90%_error_hi   8.82e-02  6.40e-02  5.82e-02  1.92e-01  1.82e-01  2.47e-01   ph/cm2/s
 
Fluence        CPL   1.93e-06  3.79e-06  4.51e-06  4.17e-06  1.24e-05  1.44e-05   erg/cm2
      90%_error_low -1.20e-07 -1.00e-07 -1.41e-07 -7.73e-07 -3.64e-07 -8.59e-07   erg/cm2
      90%_error_hi   1.22e-07  1.01e-07  1.41e-07  9.84e-07  3.64e-07  1.05e-06   erg/cm2
Peak flux      CPL   5.62e-01  7.96e-01  6.99e-01  5.45e-01  2.35e+00  2.60e+00   ph/cm2/s
      90%_error_low -1.03e-01 -7.41e-02 -6.81e-02 -2.15e-01 -1.88e-01 -2.91e-01   ph/cm2/s
      90%_error_hi   1.06e-01  7.58e-02  6.95e-02  3.87e-01  1.88e-01  4.10e-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
  307.3238   -11.8794   0.0153    28.1062   177.8328         1.4999290     12.520 TRIG_00539358                 
 
Foreground time interval of the image:
 -6.240  53.701 (delta_t =  59.941 [sec])
Background time interval of the image:
-179.200  -6.240 (delta_t = 172.960 [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   -6.240 sec. to  419.228 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.72437     ( -0.0423149   0.0421709 )
Norm@50keV  : 3.36555E-03    ( -7.54679e-05   7.54049e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          91.47 using 59 PHA bins.
# Reduced chi-squared =          1.605 for     57 degrees of freedom 
# Null hypothesis probability =   2.549772e-03
 
Photon flux (15-150 keV)    in 425.5 sec: 0.450880 ( -0.011123  0.011157 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.32373e-05 ( -3.05785e-07  3.05841e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from   -6.240 sec. to  419.228 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.986759     ( -0.194705   0.203544 )
Epeak [keV] : 69.8665      ( -5.4407 8.02855 )
Norm@50keV  : 7.64936E-03    ( -0.00146089   0.00190443 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          44.56 using 59 PHA bins.
# Reduced chi-squared =         0.7958 for     56 degrees of freedom 
# Null hypothesis probability =   8.643801e-01
 
Photon flux (15-150 keV)    in 425.5 sec: 0.424884 ( -0.012625  0.012691 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.24274e-05 ( -3.63693e-07  3.64373e-07 ) ergs/cm2

1-s peak spectrum fit

Power-law model

Time interval is from  232.564 sec. to  233.564 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.19829     ( -0.125874   0.126594 )
Norm@50keV  : 2.04276E-02    ( -0.00152671   0.00152624 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.15 using 59 PHA bins.
# Reduced chi-squared =          1.143 for     57 degrees of freedom 
# Null hypothesis probability =   2.142985e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.39722 ( -0.18146  0.18159 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.07367e-07 ( -1.74779e-08  1.76213e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from  232.564 sec. to  233.564 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.633416     ( -0.50809   0.578093 )
Epeak [keV] : 127.102      ( -40.1472 507.407 )
Norm@50keV  : 3.84260E-02    ( -0.0163487   0.0334527 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.51 using 59 PHA bins.
# Reduced chi-squared =          1.098 for     56 degrees of freedom 
# Null hypothesis probability =   2.854719e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.34520 ( -0.18804  0.18771 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.99444e-07 ( -1.92128e-08  1.9166e-08 ) ergs/cm2

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 326.092 sec.
Hardness ratio (energy fluence ratio) = 1.19074788204

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

S(15-50 keV)  = 5.716761e-06
S(50-150 keV) = 6.710587e-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 = -5.337062704727726E-01,

Spacecraft aspect plot

Bright

Pre-burst

 Time interval of the image: -179.200000 -6.240000

# RAcent #  [deg] 254.4187  35.4994 263.1398 -24.6549 268.3323  -1.5094 270.2216 -25.0957 270.3714 -25.8509 273.9355 -13.9275 275.7883 -30.4511 285.1089 -24.7924 288.8193  10.9012 299.7999  35.1594 308.1983  41.0242 334.9857 -15.9748 330.2602 -31.0988 312.1636 -24.4193

Pre-slew

 Time interval of the image: -6.240000 53.700640

# RAcent #  [deg] 254.4250  35.4129 262.9354 -24.6505 268.3442  -1.5048 270.3139 -25.2137 270.3123 -25.5996 274.0356 -13.9002 275.9918 -30.2277 285.2260 -24.9599 288.9227  11.0347 299.5535  35.0974 308.2711  41.0354 307.3238 -11.8793 286.3283 -37.2860

Post-slew

 Time interval of the image: 111.500600 467.291700 468.800000 662.880000 720.800000 782.890000 900.800000 962.884200

# RAcent #  [deg] 268.2191 270.3528 -25.0830 270.2423 -25.7676 274.0696 -14.0631 275.9499 -30.3870 285.2043 -24.9233 288.7596  10.9400 299.7766  35.1077 307.9913  40.9329 307.3174 -11.8565 331.9160 -66.5961 275.0118  35.0206 268.4098  29.0958 267.4992  21.7498

IMY = -2.019652793920537E-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] ['] 7.6 40.8 1.3 -0.4183 -1.5 9.6 Her X-1 12.5 40.0 -101.3 0.7160 0.9 9.0 GX 1+4 2.0 20.9 -72.0 1.2093 5.9 4.0 SW J1753.5-0127 3.7 36.8 -110.3 1.1029 3.2 3.5 GX 5-1 3.1 37.4 -111.1 1.3379 3.7 7.5 GRS 1758-258 4.8 25.4 -105.2 0.4940 2.4 7.7 GX 17+2 10.3 39.8 -121.0 0.4562 1.1 8.7 H1820-303 29.0 32.6 -133.0 -0.0902 -0.4 8.6 HT1900.1-2455 1.8 3.5 71.6 1.2004 6.5 2.9 GRS 1915+105 5.3 29.7 64.8 0.6388 2.2 10.6 Cyg X-1 2.5 38.1 69.7 2.7478 4.7 5.9 Cyg X-3 2.7 53.0 160.4 3.7753 4.3 ------ UNKNOWN 3.2 56.7 179.2 3.8489 3.6 ------ UNKNOWN 2.1 40.4 -172.8 1.3875 5.6 ------ UNKNOWN background subtracted image of 15-350 keV band DECcent POSerr Theta Phi PeakCts SNR AngSep Name [deg] ['] [deg] [deg] ['] 55.2 40.7 1.2 0.0347 0.2 4.5 Her X-1 7.8 40.1 -101.0 0.6350 1.5 7.0 GX 1+4 5.3 20.9 -72.0 -0.2664 -2.2 3.4 SW J1753.5-0127 7.2 36.8 -110.5 0.3473 1.6 8.2 GX 5-1 4.1 37.2 -110.8 0.6498 3.0 8.6 GRS 1758-258 8.4 25.3 -105.4 -0.1745 -1.4 8.4 GX 17+2 4.3 39.5 -121.2 0.6039 2.7 9.0 H1820-303 4.9 32.8 -133.2 0.3198 2.3 10.6 HT1900.1-2455 35.4 3.7 72.0 -0.0328 -0.3 9.1 GRS 1915+105 14.3 29.6 64.5 0.1341 0.8 6.5 Cyg X-1 5.4 38.2 69.7 -0.6964 -2.2 8.8 Cyg X-3 0.9 28.1 177.8 1.4998 12.5 ------ UNKNOWN 2.5 45.1 -135.5 1.2417 4.7 ------ UNKNOWN image of 15-350 keV band DECcent POSerr Theta Phi PeakCts SNR AngSep Name [deg] ['] [deg] [deg] ['] -1.3845 311.4 40.2 -60.4 -0.0439 -0.0 9.8 SW J1753.5-0127 3.3 37.4 -98.6 4.3940 3.5 3.7 GX 5-1 3.3 37.6 -99.6 4.7491 3.5 3.6 GRS 1758-258 2.2 32.5 -80.2 4.5178 5.3 4.0 GX 17+2 33.8 34.5 -110.0 0.2801 0.3 1.8 H1820-303 7.0 24.7 -107.6 0.9472 1.6 9.2 HT1900.1-2455 1.9 29.3 -22.3 3.2632 6.2 2.3 GRS 1915+105 5.5 47.5 9.0 2.3017 2.1 10.7 Cyg X-1 5.4 52.8 18.1 5.7200 2.1 5.5 Cyg X-3 0.3 0.1 -100.5 22.9955 44.7 ------ UNKNOWN 3.0 57.2 -173.9 9.8885 3.8 ------ UNKNOWN 3.6 56.0 -14.5 5.7086 3.2 ------ UNKNOWN 2.3 55.6 -24.3 8.1171 5.0 ------ UNKNOWN 2.6 51.6 -32.0 6.3311 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