GRB120312A

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 05:31:53 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger517566
======================================================================

  Trigger: 00517566      Segment: 000

  BAT Trigger Time: 353261196.736   [s; MET]
      Trigger Stop: 353261198.784   [s; MET]
               UTC: 2012-03-12T16:06:28.751080    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 251.764016821549   Dec: 23.8567031121096  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.22
     Image Trigger?:     NO
     Rate S/N Ratio:     13.1529464379659  [ if not an image trigger ]
     Image S/N Ratio:    8.22

  Analysis Position:   [ source = BAT ]
    RA: 251.764016821549   Dec: 23.8567031121096  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 251.811719663456   Dec: 23.8822887863147  [deg; J2000]  
        { 16h 47m 14.8s , +23d 52' 56.2" }
         +/- 2.05513130319154 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.21775922322881 [arcmin] (formal 1-sigma fit error)
    SNR: 10.869378251214
 
  Angular difference between the analysis and refined position is 3.034348 arcmin
 
  Partial Coding Fraction: 0.359375    [ including projection effects ]

  Duration
     T90: 14.1559999585152 +/- 4.16517039858964
        Measured from: 0.015999972820282
                   to: 14.1719999313354     [s; relative to TRIGTIME]
     T50: 5.92799991369247 +/- 2.98029862545656
        Measured from: 1.00800001621246
                   to: 6.93599992990494     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.924000024795532     
                   to: 1.92400002479553     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -1.42400002479553     
                   to: 15.9120000004768     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.280983   0.334448   0.245335   0.083116
           0.046106   0.041706   0.034913   0.029223 [error]
 Peak      0.049700   0.046883   0.026156   0.025234
           0.011461   0.010562   0.009381   0.007130 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   17.336   -1.424   15.912
T90    14.156    0.016   14.172
T50     5.928    1.008    6.936
Peak    1.000    0.924    1.924
 
 
====== 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      -1.712    -0.243      0.237       -           -               -         3.53e-03     -4.95e-04          4.90e-04      53.090   57
CPL     -1.194    -0.721      1.233       78.243     -26.858       -78.243      6.42e-03     -3.13e-03          1.91e-02      52.340   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      -1.874     -0.482     0.434       -           -               -         8.85e-03     -2.40e-03          2.24e-03      51.830   57
CPL     -1.873     -1.075     0.737     9999.310      N/A           N/A         8.85e-03        N/A               N/A         51.830   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   9.55e-08  1.54e-07  1.88e-07  4.52e-07  5.67e-07  8.90e-07   erg/cm2
      90%_error_low -2.10e-08 -2.16e-08 -3.45e-08 -1.54e-07 -8.19e-08 -1.86e-07   erg/cm2
      90%_error_hi   2.24e-08  2.14e-08  3.42e-08  1.98e-07  8.26e-08  2.19e-07   erg/cm2
Peak flux       PL   5.22e-01  4.21e-01  2.30e-01  1.84e-01  1.26e+00  1.36e+00   ph/cm2/s
      90%_error_low -1.85e-01 -9.68e-02 -8.09e-02 -1.03e-01 -2.90e-01 -3.05e-01   ph/cm2/s
      90%_error_hi   2.04e-01  9.59e-02  7.88e-02  1.58e-01  2.91e-01  3.05e-01   ph/cm2/s
 
Fluence        CPL   8.71e-08  1.62e-07  1.95e-07  2.27e-07  5.48e-07  6.70e-07   erg/cm2
      90%_error_low -2.67e-08 -2.60e-08 -3.74e-08 -1.57e-07 -8.97e-08 -1.86e-07   erg/cm2
      90%_error_hi   2.73e-08  2.71e-08  3.87e-08  2.77e-07  9.01e-08  3.02e-07   erg/cm2
Peak flux      CPL   5.01e-01  3.82e-01  2.26e-01  1.61e-01  1.27e+00  1.35e+00   ph/cm2/s
      90%_error_low -2.24e-01 -1.71e-01 -2.26e-01 -6.29e-02 -3.04e-01 -3.01e-01   ph/cm2/s
      90%_error_hi   2.26e-01  1.28e-01  6.14e-02  5.09e-02  2.80e-01  3.09e-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
  251.8117    23.8823   0.0177    41.6293   164.0935         1.0192097     10.869 TRIG_00517566                 
 
Foreground time interval of the image:
 -1.424  15.912 (delta_t =  17.336 [sec])
Background time interval of the image:
-48.835  -1.424 (delta_t =  47.411 [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   -1.424 sec. to   15.912 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.71202     ( -0.24307   0.2368 )
Norm@50keV  : 3.53416E-03    ( -0.00049511   0.000490044 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.09 using 59 PHA bins.
# Reduced chi-squared =         0.9314 for     57 degrees of freedom 
# Null hypothesis probability =   6.224441e-01
 
Photon flux (15-150 keV)    in 17.34 sec: 0.471384 ( -0.066214  0.066567 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.66969e-07 ( -8.18942e-08  8.25902e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -1.424 sec. to   15.912 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.19438     ( -0.721106   1.23344 )
Epeak [keV] : 78.2431      ( -26.8687 -78.2539 )
Norm@50keV  : 6.42175E-03    ( -0.00312579   0.0190911 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.34 using 59 PHA bins.
# Reduced chi-squared =         0.9346 for     56 degrees of freedom 
# Null hypothesis probability =   6.143227e-01
 
Photon flux (15-150 keV)    in 17.34 sec: 0.458638 ( -0.07124  0.070943 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.48201e-07 ( -8.9722e-08  9.01203e-08 ) ergs/cm2

1-s peak spectrum fit

Power-law model

Time interval is from    0.924 sec. to    1.924 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.87405     ( -0.481605   0.434011 )
Norm@50keV  : 8.84646E-03    ( -0.00239789   0.00223791 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.83 using 59 PHA bins.
# Reduced chi-squared =         0.9093 for     57 degrees of freedom 
# Null hypothesis probability =   6.689243e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.25588 ( -0.290099  0.29078 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.13392e-08 ( -2.08775e-08  2.12472e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    0.924 sec. to    1.924 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.69987     ( -0.248148   1.5636 )
Epeak [keV] : 232.927      (   )
Norm@50keV  : 3.54837E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.03 using 59 PHA bins.
# Reduced chi-squared =         0.9113 for     56 degrees of freedom 
# Null hypothesis probability =   6.630159e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.26946 ( -0.304182  0.27953 ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 14.156 sec.
Hardness ratio (energy fluence ratio) = 1.22098365375

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

S(15-50 keV)  = 2.4974946e-07
S(50-150 keV) = 3.17217e-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 = -8.547270635103429E-01,

Spacecraft aspect plot

Bright

Pre-burst

 Time interval of the image: -48.835400 -1.424000

# RAcent #  [deg] 244.9871 -15.6459 254.4374  35.1950 255.9891 -37.8245 256.3957 -36.5698 262.9212 -24.8869 264.7760 -44.4448 268.2338  -1.3484 270.2527 -25.0162 270.2201 -25.6700 273.8504 -14.0555 275.7568 -30.3907 284.8711 -24.8795 288.7432  11.0300 263.1570 -33.7480 207.6969 -42.6271 254.4952 -11.2597 263.2763  13.0098 296.2114  17.4575

Pre-slew

 Time interval of the image: -1.424000 15.912000

# RAcent #  [deg] 244.9799 -15.6407 254.5808  35.3642 256.0225 -38.0001 256.4531 -36.3248 262.9890 -24.6914  138.6 264.5445 -44.4965 268.5137  -1.4341 270.1472 -24.9261 270.2448 -25.5941 273.9153 -14.1733 275.8578 -30.3676 284.8711 -24.8749 288.6741  10.9737 263.0656 -33.8462 250.9318  20.7869 251.8117  23.8823 270.9243 -37.5952

Post-slew

 Time interval of the image: 86.164600 962.327900

# RAcent #  [deg] 244.9865 -15.6314 254.6352  35.4814 263.1198 -24.7307 268.3675  -1.4041 270.2426 -25.1015 270.2628 -25.7720 274.0202 -14.0757 275.9998 -30.4972 288.7935  10.9233 299.5725  35.1706 219.2397  28.4241 255.3276   2.4490 268.4271 -17.8006 313.3614  69.6301

IMY = -2.435805688172751E-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] ['] 0.6 11.8 88.3 1.5232 20.2 0.6 Sco X-1 6.3 52.7 168.7 -0.5067 -1.8 8.9 Her X-1 1.6 20.4 -5.9 0.5347 7.2 1.2 4U 1700-377 10.9 19.2 -6.7 0.0776 1.1 9.0 GX 349+2 11.7 9.2 -43.4 0.0689 1.0 9.7 GX 1+4 106.6 27.8 -20.3 0.0086 0.1 1.5 4U 1735-44 5.1 19.4 -153.2 0.1768 2.3 10.2 SW J1753.5-0127 4.1 14.4 -64.4 0.2118 2.8 4.1 GX 5-1 4.5 14.7 -62.1 0.1996 2.6 6.2 GRS 1758-258 6.5 16.4 -108.0 0.1372 1.8 9.1 GX 17+2 3.1 21.3 -57.7 0.3149 3.6 8.8 H1820-303 4.5 26.9 -77.7 0.2589 2.5 9.3 HT1900.1-2455 2.9 42.2 -138.6 0.5946 4.0 6.0 GRS 1915+105 17.5 17.2 -25.7 -0.0478 -0.7 9.9 GX 354-0 2.1 48.8 39.5 1.8412 5.4 ------ UNKNOWN 2.2 6.7 148.5 0.3611 5.3 ------ UNKNOWN 2.4 31.0 -176.9 0.4032 4.8 ------ UNKNOWN 2.3 51.9 -138.8 1.7667 5.0 ------ UNKNOWN background subtracted image of 15-350 keV band DECcent POSerr Theta Phi PeakCts SNR AngSep Name [deg] ['] [deg] [deg] ['] 195.3 11.8 88.4 -0.0029 -0.1 0.0 Sco X-1 18.2 52.8 168.8 0.1261 0.6 6.2 Her X-1 13.1 20.6 -6.0 -0.0449 -0.9 9.5 4U 1700-377 4.6 18.9 -6.8 -0.1262 -2.5 6.0 GX 349+2 9.1 -44.4 0.0039 0.1 3.4 GX 1+4 52.1 27.8 -19.9 0.0110 0.2 8.9 4U 1735-44 7.3 19.5 -152.4 0.0791 1.6 8.8 SW J1753.5-0127 4.3 14.2 -64.6 -0.1287 -2.7 11.8 GX 5-1 7.4 14.7 -62.4 0.0759 1.5 9.5 GRS 1758-258 135.1 16.5 -107.6 -0.0045 -0.1 9.8 GX 17+2 5.8 21.4 -57.9 -0.1131 -2.0 3.5 H1820-303 5.9 26.9 -77.7 -0.1224 -1.9 9.4 HT1900.1-2455 18.4 42.1 -138.6 -0.0618 -0.6 7.5 GRS 1915+105 5.3 17.3 -25.3 0.0995 2.2 3.9 GX 354-0 2.1 38.7 162.1 0.4070 5.6 ------ UNKNOWN 1.1 41.6 164.1 1.0184 10.9 ------ UNKNOWN 2.2 23.5 -36.8 0.2647 5.2 ------ UNKNOWN image of 15-350 keV band DECcent POSerr Theta Phi PeakCts SNR AngSep Name [deg] ['] [deg] [deg] ['] 0.4 40.0 12.2 22.8926 30.8 0.7 Sco X-1 5.2 11.9 -166.5 1.0226 2.2 12.0 Her X-1 13.1 49.8 -11.5 0.8459 0.9 6.1 GX 1+4 2.3 30.0 -32.8 2.6022 5.1 2.9 SW J1753.5-0127 2.4 52.1 -19.3 5.2064 4.8 2.6 GX 5-1 14.1 52.8 -19.0 0.9738 0.8 2.8 GRS 1758-258 6.4 43.7 -30.0 1.5026 1.8 2.5 GX 17+2 0.0 59.1 -22.3 3.3797 1.2 8.7 H1820-303 1.8 37.5 -74.3 9.5734 6.5 1.4 GRS 1915+105 1.6 42.7 -114.7 14.4988 7.3 2.1 Cyg X-1 2.8 29.5 108.1 2.9974 4.1 ------ UNKNOWN 3.0 21.7 -7.6 1.6553 3.8 ------ UNKNOWN 2.6 44.7 -20.8 3.3421 4.5 ------ UNKNOWN 3.6 58.0 -156.8 12.2133 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