GRB120121A

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 07:02:03 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger512164
======================================================================

  Trigger: 00512164      Segment: 000

  BAT Trigger Time: 348831747.072   [s; MET]
      Trigger Stop: 348831751.168   [s; MET]
               UTC: 2012-01-21T09:42:19.266000    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 249.336314295725   Dec: -23.9543948122384  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    9.97
     Image Trigger?:     NO
     Rate S/N Ratio:     8.94427190999916  [ if not an image trigger ]
     Image S/N Ratio:    9.97

  Analysis Position:   [ source = BAT ]
    RA: 249.336314295725   Dec: -23.9543948122384  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 249.363059302669   Dec: -23.9605202040783  [deg; J2000]  
        { 16h 37m 27.1s , -23d 57' 37.9" }
         +/- 1.38765494269346 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.427145077573602 [arcmin] (formal 1-sigma fit error)
    SNR: 19.0484267830923
 
  Angular difference between the analysis and refined position is 1.511804 arcmin
 
  Partial Coding Fraction: 0.703125    [ including projection effects ]

  Duration
     T90: 26.7999999523163 +/- 3.41916774787436
        Measured from: -9.62800002098083
                   to: 17.1719999313354     [s; relative to TRIGTIME]
     T50: 11.4919999241829 +/- 2.61489955869669
        Measured from: -2.77600002288818
                   to: 8.71599990129471     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 2.85999995470047     
                   to: 3.85999995470047     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -11.0040000081062     
                   to: 19.7759999632835     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.282813   0.564119   0.563091   0.149051
           0.045146   0.042370   0.036429   0.030258 [error]
 Peak      0.019009   0.032302   0.031983   0.009908
           0.008107   0.007661   0.006576   0.005449 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   30.780  -11.004   19.776
T90    26.800   -9.628   17.172
T50    11.492   -2.776    8.716
Peak    1.000    2.860    3.860
 
 
====== 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      -1.223    -0.131      0.134       -           -               -         3.60e-03     -2.76e-04          2.76e-04      59.150   57
CPL     -0.365    -0.584      0.681      108.100     -24.864       103.261      8.66e-03     -3.82e-03          8.16e-03      52.470   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      -1.397     -0.409     0.415       -           -               -         6.02e-03     -1.48e-03          1.47e-03      40.100   57
CPL     -0.029     -1.063     2.976       78.091     -23.618       -78.091      2.60e-02     -2.60e-02          4.74e-01      38.440   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   1.09e-07  2.38e-07  4.08e-07  1.61e-06  1.12e-06  2.37e-06   erg/cm2
      90%_error_low -1.63e-08 -2.20e-08 -3.49e-08 -2.90e-07 -8.92e-08 -3.11e-07   erg/cm2
      90%_error_hi   1.72e-08  2.18e-08  3.47e-08  3.32e-07  8.96e-08  3.46e-07   erg/cm2
Peak flux       PL   2.24e-01  2.40e-01  1.82e-01  2.26e-01  7.33e-01  8.73e-01   ph/cm2/s
      90%_error_low -9.25e-02 -6.82e-02 -5.19e-02 -1.08e-01 -1.88e-01 -2.14e-01   ph/cm2/s
      90%_error_hi   1.07e-01  6.68e-02  5.10e-02  1.54e-01  1.90e-01  2.15e-01   ph/cm2/s
 
Fluence        CPL   8.77e-08  2.49e-07  4.41e-07  6.30e-07  1.07e-06  1.41e-06   erg/cm2
      90%_error_low -2.06e-08 -2.48e-08 -4.20e-08 -2.63e-07 -9.68e-08 -2.76e-07   erg/cm2
      90%_error_hi   2.17e-08  2.51e-08  4.30e-08  5.21e-07  9.65e-08  5.17e-07   erg/cm2
Peak flux      CPL   1.62e-01  2.59e-01  2.07e-01  8.00e-02  6.85e-01  7.08e-01   ph/cm2/s
      90%_error_low -1.10e-01 -8.03e-02 -6.29e-02 -8.00e-02 -2.00e-01 -2.18e-01   ph/cm2/s
      90%_error_hi   1.33e-01  8.19e-02  6.69e-02  2.01e-01  2.01e-01  2.93e-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
  249.3631   -23.9605   0.0101    32.9980   -26.1171         1.5694920     19.048 TRIG_00512164                 
 
Foreground time interval of the image:
-11.004  19.776 (delta_t =  30.780 [sec])
Background time interval of the image:
-239.072 -11.004 (delta_t = 228.068 [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  -11.004 sec. to   19.776 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.22283     ( -0.131331   0.133735 )
Norm@50keV  : 3.60044E-03    ( -0.000276069   0.000275668 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.15 using 59 PHA bins.
# Reduced chi-squared =          1.038 for     57 degrees of freedom 
# Null hypothesis probability =   3.970539e-01
 
Photon flux (15-150 keV)    in 30.78 sec: 0.424024 ( -0.034587  0.034758 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.11735e-06 ( -8.91927e-08  8.96003e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from  -11.004 sec. to   19.776 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.365091     ( -0.583959   0.681221 )
Epeak [keV] : 108.100      ( -24.8635 103.261 )
Norm@50keV  : 8.66375E-03    ( -0.0038202   0.00815744 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.47 using 59 PHA bins.
# Reduced chi-squared =         0.9370 for     56 degrees of freedom 
# Null hypothesis probability =   6.092783e-01
 
Photon flux (15-150 keV)    in 30.78 sec: 0.404632 ( -0.036915  0.037033 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.06831e-06 ( -9.68216e-08  9.65341e-08 ) ergs/cm2

1-s peak spectrum fit

Power-law model

Time interval is from    2.860 sec. to    3.860 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.39693     ( -0.408759   0.414464 )
Norm@50keV  : 6.01987E-03    ( -0.00147531   0.00147376 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          40.10 using 59 PHA bins.
# Reduced chi-squared =         0.7035 for     57 degrees of freedom 
# Null hypothesis probability =   9.563336e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.732594 ( -0.18805  0.19013 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.8213e-08 ( -1.5068e-08  1.5257e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    2.860 sec. to    3.860 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.0286136     ( -1.06336   2.97618 )
Epeak [keV] : 78.0906      ( -23.618 -78.0907 )
Norm@50keV  : 2.59965E-02    ( -0.0259964   0.473637 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          38.44 using 59 PHA bins.
# Reduced chi-squared =         0.6864 for     56 degrees of freedom 
# Null hypothesis probability =   9.647816e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.685264 ( -0.199732  0.201052 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.43488e-08 ( -1.57717e-08  1.62228e-08 ) ergs/cm2

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 26.8 sec.
Hardness ratio (energy fluence ratio) = 1.76872455913

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

S(15-50 keV)  = 3.3705187e-07
S(50-150 keV) = 7.312438e-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 = 5.830556130485854E-01,

Spacecraft aspect plot

Bright

Pre-burst

 Time interval of the image: -239.072000 -11.004000

# RAcent #  [deg] 244.9867 -15.6381 254.4603  35.3411 255.9904 -37.8301 256.5503 -36.3908 262.9382 -24.7023 268.4645  -1.4287 270.2099 -25.0913 270.2510 -25.7017 274.0141 -14.0103 275.9459 -30.3935 288.7876  10.9523 299.5981  35.1200 308.1301  40.8629 263.1256 -33.9091 317.6917  29.8915 275.2747 -33.4952

Pre-slew

 Time interval of the image: -11.004000 19.776000

# RAcent #  [deg] 244.9427 -15.7267 254.5613  35.2833 256.0057 -37.7763 256.4325 -36.4248 263.2006 -24.7025 268.5772  -1.4448 270.3578 -24.9671 270.3786 -25.6332 274.0324 -14.2308 275.7249 -30.4040 288.7019  10.8371 299.5647  35.3140 308.1788  40.8825 263.0143 -33.8528 221.3393  26.2064 252.1237  26.6952 249.3630 -23.9605 264.0835 -15.5535 317.1054  27.3263

Post-slew

 Time interval of the image: 103.028600 962.961300 1663.928000 1844.138000

# RAcent #  [deg] 244.9807 -15.6451 255.9700 -37.8446 256.4377 -36.4333 262.9132 -24.7433 264.5451 -44.3153 268.3178  -1.4396 270.2349 -25.0929 270.1361 -25.6738 273.9810 -14.1512 275.7623 -30.4810 285.0113 -25.0527 262.8316 -33.9801 257.7068  17.8912 256.8236 -14.8804 269.7219  30.3061

IMY = 2.858521460019826E-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 27.0 -11.9 7.4470 32.2 0.4 Sco X-1 2.5 27.8 131.5 1.2841 4.6 0.2 Her X-1 2.4 45.7 -38.8 2.3248 4.9 0.9 4U 1700-377 4.7 44.2 -39.3 1.0615 2.5 5.9 GX 349+2 22.5 32.8 -49.0 0.1521 0.5 4.7 GX 1+4 3.1 13.6 -89.1 0.8879 3.7 6.0 SW J1753.5-0127 2.6 34.9 -60.3 1.5636 4.4 4.1 GX 5-1 5.1 35.4 -60.0 0.8255 2.3 3.7 GRS 1758-258 2.5 26.7 -76.8 1.3552 4.6 1.6 GX 17+2 5.7 41.7 -64.4 1.5321 2.0 1.9 H1820-303 0.8 30.1 -139.8 3.9421 15.3 0.8 GRS 1915+105 5.8 46.5 -173.6 0.7975 2.0 4.9 Cyg X-1 24.8 55.0 -176.7 0.3939 0.5 5.5 Cyg X-3 4.1 42.0 -47.3 1.2509 2.8 8.1 GX 354-0 3.8 59.5 -161.7 4.9696 3.1 ------ UNKNOWN 2.8 44.3 -61.7 4.1590 4.1 ------ UNKNOWN background subtracted image of 15-350 keV band DECcent POSerr Theta Phi PeakCts SNR AngSep Name [deg] ['] [deg] [deg] ['] 6.6 27.1 -11.9 0.1298 1.8 5.6 Sco X-1 25.1 27.7 131.7 0.0428 0.5 6.2 Her X-1 3.4 45.7 -38.8 0.5122 3.4 4.2 4U 1700-377 113.0 44.3 -39.2 0.0147 0.1 0.2 GX 349+2 31.2 32.9 -49.5 0.0349 0.4 10.8 GX 1+4 0.0 13.7 -89.4 -0.1156 -1.6 12.6 SW J1753.5-0127 5.7 34.8 -60.6 -0.2281 -2.0 7.8 GX 5-1 28.8 35.4 -60.2 -0.0478 -0.4 7.8 GRS 1758-258 0.0 26.9 -76.6 0.1307 1.5 11.8 GX 17+2 5.9 41.7 -64.1 0.4690 1.9 10.6 H1820-303 9.8 30.0 -139.6 0.1009 1.2 8.6 GRS 1915+105 4.8 46.6 -173.8 -0.3204 -2.4 6.9 Cyg X-1 4.5 55.0 -176.7 -0.6535 -2.5 5.2 Cyg X-3 5.2 41.9 -47.2 -0.3313 -2.2 1.7 GX 354-0 2.4 39.7 80.7 1.3009 4.8 ------ UNKNOWN 2.8 19.8 121.6 0.3024 4.1 ------ UNKNOWN 0.6 33.0 -26.1 1.5695 19.0 ------ UNKNOWN 2.2 24.0 -54.9 0.4133 5.3 ------ UNKNOWN 1.9 58.6 -158.8 2.2042 6.0 ------ UNKNOWN image of 15-350 keV band DECcent POSerr Theta Phi PeakCts SNR AngSep Name [deg] ['] [deg] [deg] ['] 0.3 9.3 146.6 30.7929 45.6 0.3 Sco X-1 0.4 15.0 -26.9 18.4065 26.6 0.8 4U 1700-377 2.0 13.9 -30.7 4.0109 5.8 0.6 GX 349+2 3.9 12.4 -90.0 2.0721 2.9 5.2 GX 1+4 0.0 23.8 -34.0 -0.5665 -0.8 11.7 4U 1735-44 3.3 29.1 -144.4 2.5646 3.5 3.1 SW J1753.5-0127 2.1 19.0 -88.6 4.0297 5.5 2.8 GX 5-1 102.3 18.9 -86.8 0.0890 0.1 9.9 GRS 1758-258 3.1 25.2 -114.8 3.3794 3.7 7.0 GX 17+2 5.7 24.3 -75.0 1.7729 2.0 10.8 H1820-303 11.7 32.4 -86.9 -1.2523 -1.0 8.0 HT1900.1-2455 8.8 15.4 -52.9 0.9428 1.3 11.7 GX 354-0 2.7 42.7 -174.5 4.9432 4.3 ------ UNKNOWN 3.7 11.5 -147.3 1.9769 3.1 ------ UNKNOWN 3.7 57.7 -165.5 11.5314 3.2 ------ 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