GRB141212B: Summary Image Light curves Spectra Distribution Others

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  4 09:35:36 EST 2015
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger621234
======================================================================

  Trigger: 00621234      Segment: 000

  BAT Trigger Time: 440083441.152   [s; MET]
      Trigger Stop: 440083442.176   [s; MET]
               UTC: 2014-12-12T13:23:48.244720    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 250.868604999012   Dec: 31.7493121278424  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.17
     Image Trigger?:     NO
     Rate S/N Ratio:     11.7473401244707  [ if not an image trigger ]
     Image S/N Ratio:    7.17

  Analysis Position:   [ source = BAT ]
    RA: 250.868604999012   Dec: 31.7493121278424  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 250.865793907996   Dec: 31.7510698624626  [deg; J2000]  
        { 16h 43m 27.8s , +31d 45' 03.9" }
         +/- 1.00452161809235 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.376291693377804 [arcmin] (formal 1-sigma fit error)
    SNR: 30.2217353233513
 
  Angular difference between the analysis and refined position is 0.178026 arcmin
 
  Partial Coding Fraction: 0.7734375    [ including projection effects ]

  Duration
     T90: 10.5079999566078 +/- 0.685623802051872
        Measured from: 0.759999990463257
                   to: 11.2679999470711     [s; relative to TRIGTIME]
     T50: 2.24799996614456 +/- 0.599212802618918
        Measured from: 4.10799998044968
                   to: 6.35599994659424     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 4.09999996423721     
                   to: 5.09999996423721     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.0600000023841858     
                   to: 12.1359999775887     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.447133   0.700886   0.544585   0.110974
           0.029715   0.031316   0.028076   0.022399 [error]
 Peak      0.086392   0.183245   0.176457   0.050354
           0.009470   0.010949   0.010714   0.007643 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   12.196   -0.060   12.136
T90    10.508    0.760   11.268
T50     2.248    4.108    6.356
Peak    1.000    4.100    5.100
 
 
====== 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      -1.460    -0.089      0.089       -           -               -         1.02e-02     -5.22e-04          5.21e-04      47.710   57
CPL     -1.065    -0.339      0.368      121.704     -35.901       338.300      1.59e-02     -4.97e-03          7.99e-03      43.670   56
 
 
=== 1-s peak 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      -1.114     -0.106     0.107       -           -               -         3.37e-02     -2.20e-03          2.20e-03      60.170   57
CPL     -0.381     -0.443     0.496      120.862     -28.672        97.113      7.45e-02     -2.78e-02          5.04e-02      51.670   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   1.53e-07  2.87e-07  4.18e-07  1.29e-06  1.19e-06  2.15e-06   erg/cm2
      90%_error_low -1.37e-08 -1.58e-08 -2.71e-08 -1.73e-07 -6.61e-08 -1.94e-07   erg/cm2
      90%_error_hi   1.41e-08  1.58e-08  2.70e-08  1.90e-07  6.64e-08  2.08e-07   erg/cm2
Peak flux       PL   9.59e-01  1.22e+00  1.12e+00  1.82e+00  3.91e+00  5.12e+00   ph/cm2/s
      90%_error_low -1.16e-01 -9.42e-02 -8.19e-02 -2.59e-01 -2.62e-01 -3.56e-01   ph/cm2/s
      90%_error_hi   1.21e-01  9.35e-02  8.15e-02  2.84e-01  2.62e-01  3.60e-01   ph/cm2/s
 
Fluence        CPL   1.42e-07  2.98e-07  4.30e-07  7.40e-07  1.15e-06  1.61e-06   erg/cm2
      90%_error_low -1.63e-08 -1.85e-08 -2.96e-08 -2.65e-07 -7.23e-08 -2.72e-07   erg/cm2
      90%_error_hi   1.66e-08  1.88e-08  3.00e-08  4.49e-07  7.22e-08  4.46e-07   erg/cm2
Peak flux      CPL   8.15e-01  1.29e+00  1.22e+00  9.15e-01  3.83e+00  4.24e+00   ph/cm2/s
      90%_error_low -1.40e-01 -1.08e-01 -1.01e-01 -2.92e-01 -2.67e-01 -3.97e-01   ph/cm2/s
      90%_error_hi   1.45e-01  1.10e-01  1.03e-01  4.50e-01  2.67e-01  4.95e-01   ph/cm2/s
 
======================================================================

Image

Pre-slew 15.0-350.0 keV image (Event data)

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  250.8658    31.7511   0.0064    30.1980     0.5788         1.7227268     30.222 TRIG_00621234                 
 
Foreground time interval of the image:
 -0.060  10.949 (delta_t =  11.009 [sec])
Background time interval of the image:
-239.152  -0.060 (delta_t = 239.092 [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

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   -0.060 sec. to   12.136 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.46017     ( -0.088904   0.0887968 )
Norm@50keV  : 1.01740E-02    ( -0.000521646   0.000521084 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          47.71 using 59 PHA bins.
# Reduced chi-squared =         0.8370 for     57 degrees of freedom 
# Null hypothesis probability =   8.048811e-01
 
Photon flux (15-150 keV)    in 12.2 sec: 1.25703 ( -0.0663  0.06639 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.18571e-06 ( -6.60952e-08  6.63892e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -0.060 sec. to   12.136 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.0645     ( -0.339258   0.367801 )
Epeak [keV] : 121.704      ( -35.901 338.3 )
Norm@50keV  : 1.59367E-02    ( -0.00497421   0.0079873 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          43.67 using 59 PHA bins.
# Reduced chi-squared =         0.7799 for     56 degrees of freedom 
# Null hypothesis probability =   8.846982e-01
 
Photon flux (15-150 keV)    in 12.2 sec: 1.23303 ( -0.06931  0.06934 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.15319e-06 ( -7.23009e-08  7.21624e-08 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    4.100 sec. to    5.100 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.11354     ( -0.105636   0.106849 )
Norm@50keV  : 3.37020E-02    ( -0.00220365   0.00220299 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.17 using 59 PHA bins.
# Reduced chi-squared =          1.056 for     57 degrees of freedom 
# Null hypothesis probability =   3.618685e-01
 
Photon flux (15-150 keV)    in 1 sec: 3.91449 ( -0.26194  0.2622 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.50889e-07 ( -2.50073e-08  2.51215e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    4.100 sec. to    5.100 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.38113     ( -0.443405   0.495822 )
Epeak [keV] : 120.862      ( -28.672 97.1128 )
Norm@50keV  : 7.45241E-02    ( -0.0278329   0.050427 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.67 using 59 PHA bins.
# Reduced chi-squared =         0.9227 for     56 degrees of freedom 
# Null hypothesis probability =   6.392181e-01
 
Photon flux (15-150 keV)    in 1 sec: 3.83017 ( -0.26749  0.26745 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.38626e-07 ( -2.68519e-08  2.67247e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 10.508 sec.
Hardness ratio (energy fluence ratio) = 1.45381788178

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

S(15-50 keV)  = 4.401676e-07
S(50-150 keV) = 7.455501e-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 = 5.819381555698157E-01, IMY = -5.878992609027462E-03

Spacecraft aspect plot

Bright source in the pre-burst/pre-slew/post-slew images

Pre-burst image of 15-350 keV band

Time interval of the image:
-239.152000 -0.060000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.6307  35.2927    8.0  28.5    9.6   0.4237   1.4    9.0	Her X-1                       
268.3209  -1.2611    7.7  25.2  -84.8   0.4625   1.5   11.8	SW J1753.5-0127               
273.8621 -14.0258   28.1  35.0 -104.7   0.2551   0.4    8.4	GX 17+2                       
284.9583 -24.9897   11.5  45.1 -122.3   1.1020   1.0    5.9	HT1900.1-2455                 
288.7778  10.9414    0.7  11.2 -155.1   3.8527  16.2    1.2	GRS 1915+105                  
299.5942  35.2109    0.8  21.7  103.5   4.7932  15.1    0.6	Cyg X-1                       
308.1302  40.9800    3.9  30.5  102.4   1.3397   3.0    1.9	Cyg X-3                       
320.6448 -22.9007    2.8  57.2 -161.7   5.3887   4.1 ------	UNKNOWN                       
237.7604   7.6466    3.6  44.5  -38.3   1.6369   3.2 ------	UNKNOWN                       
226.9698   8.0451    2.6  54.5  -33.0   5.9790   4.4 ------	UNKNOWN                       

Pre-slew background subtracted image of 15-350 keV band

Time interval of the image:
-0.060000 10.948600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4243  35.4855   10.5  28.7    9.8  -0.0628  -1.1    8.7	Her X-1                       
268.1818  -1.5267    0.0  25.5  -84.8  -0.0272  -0.4   12.0	SW J1753.5-0127               
273.9609 -14.1399    4.0  35.1 -104.9   0.2644   2.9    6.7	GX 17+2                       
284.8068 -24.9918  832.8  45.1 -122.1   0.0029   0.0   13.2	HT1900.1-2455                 
288.9787  10.9610  295.1  11.3 -156.0   0.0019   0.0   10.7	GRS 1915+105                  
299.4616  35.0940    4.5  21.5  103.5   0.1540   2.5    9.0	Cyg X-1                       
308.1136  41.1569    0.0  30.6  102.1  -0.0966  -1.0   12.3	Cyg X-3                       
250.8658  31.7511    0.4  30.2    0.6   1.7226  30.2 ------	UNKNOWN                       
304.5310  -1.9226    2.2  31.2 -166.2   0.3025   5.3 ------	UNKNOWN                       
233.8197  10.8775    2.2  47.2  -32.2   0.5467   5.2 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
68.948600 530.148600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.2896  35.2427    4.9   4.5  138.2  -0.9142  -2.3   10.2	Her X-1                       
268.3563  -1.5193    7.8  37.2 -109.9   1.4031   1.5    4.1	SW J1753.5-0127               
288.8056  10.9361    0.8  40.7 -147.9   9.0200  13.8    0.7	GRS 1915+105                  
299.5989  35.2045    0.9  40.4  171.3   8.9259  12.5    0.5	Cyg X-1                       
308.2103  40.8442    5.4  46.3  161.7   2.5666   2.2    7.9	Cyg X-3                       
205.5587  43.1477    4.7  37.2   40.9   2.0298   2.5 ------	UNKNOWN                       
193.1677  13.9313    3.6  55.4    5.2   7.6909   3.3 ------	UNKNOWN                       
244.6453  12.3018    2.8  20.3  -62.3   1.9184   4.2 ------	UNKNOWN                       
304.0283   7.3293    3.2  55.1 -155.7   5.5845   3.6 ------	UNKNOWN                       
259.2174  -8.3368    3.8  40.9  -92.8   6.7266   3.1 ------	UNKNOWN