GRB141221A: 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 09:28:55 EST 2015
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger622006
======================================================================

  Trigger: 00622006      Segment: 000

  BAT Trigger Time: 440842043.904   [s; MET]
      Trigger Stop: 440842044.928   [s; MET]
               UTC: 2014-12-21T08:07:10.958720    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 198.269160599318   Dec: 8.21006046919977  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    14.98
     Image Trigger?:     NO
     Rate S/N Ratio:     41.194659848092  [ if not an image trigger ]
     Image S/N Ratio:    14.98

  Analysis Position:   [ source = BAT ]
    RA: 198.269160599318   Dec: 8.21006046919977  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 198.282698999598   Dec: 8.19756201914579  [deg; J2000]  
        { 13h 13m 07.8s , +08d 11' 51.2" }
         +/- 1.04114929241389 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.352935703791261 [arcmin] (formal 1-sigma fit error)
    SNR: 28.7144033560413
 
  Angular difference between the analysis and refined position is 1.099438 arcmin
 
  Partial Coding Fraction: 0.7890625    [ including projection effects ]

  Duration
     T90: 36.8159999847412 +/- 4.1037256240395
        Measured from: -21.1520000100136
                   to: 15.6639999747276     [s; relative to TRIGTIME]
     T50: 14.6159999370575 +/- 3.16572897935709
        Measured from: -3.9559999704361
                   to: 10.6599999666214     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.0959999561309814     
                   to: 0.904000043869019     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -24.1119999885559     
                   to: 20.3320000171661     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.107679   1.428700   0.861426   0.228633
           0.050427   0.052709   0.046044   0.039067 [error]
 Peak      0.082249   0.138096   0.132562   0.047500
           0.008925   0.010122   0.009479   0.007443 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   44.444  -24.112   20.332
T90    36.816  -21.152   15.664
T50    14.616   -3.956   10.660
Peak    1.000   -0.096    0.904
 
 
====== 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: N/A)
 
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      -1.736    -0.084      0.083       -           -               -         5.15e-03     -2.50e-04          2.49e-04      73.000   57
CPL     -1.256    -0.352      0.385       72.839     -14.425        67.581      9.20e-03     -3.13e-03          5.36e-03      67.420   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      -1.131     -0.134     0.136       -           -               -         2.63e-02     -1.99e-03          1.99e-03      63.120   57
CPL     -1.080     -0.174     0.528      979.872    -979.872      -979.872      2.78e-02     -3.22e-03          2.10e-02      63.130   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   3.65e-07  5.80e-07  6.97e-07  1.63e-06  2.11e-06  3.28e-06   erg/cm2
      90%_error_low -2.74e-08 -2.69e-08 -4.57e-08 -2.16e-07 -1.07e-07 -2.56e-07   erg/cm2
      90%_error_hi   2.80e-08  2.68e-08  4.58e-08  2.37e-07  1.07e-07  2.73e-07   erg/cm2
Peak flux       PL   7.59e-01  9.53e-01  8.70e-01  1.39e+00  3.06e+00  3.97e+00   ph/cm2/s
      90%_error_low -1.12e-01 -8.70e-02 -7.62e-02 -2.45e-01 -2.38e-01 -3.24e-01   ph/cm2/s
      90%_error_hi   1.17e-01  8.59e-02  7.56e-02  2.78e-01  2.38e-01  3.31e-01   ph/cm2/s
 
Fluence        CPL   3.39e-07  6.09e-07  7.03e-07  7.85e-07  2.02e-06  2.44e-06   erg/cm2
      90%_error_low -3.28e-08 -3.37e-08 -4.90e-08 -3.01e-07 -1.26e-07 -3.28e-07   erg/cm2
      90%_error_hi   3.32e-08  3.43e-08  4.91e-08  5.33e-07  1.26e-07  5.41e-07   erg/cm2
Peak flux      CPL   7.52e-01  9.59e-01  8.71e-01  1.38e+00  3.05e+00  3.89e+00   ph/cm2/s
      90%_error_low -1.35e-01 -9.23e-02 -7.55e-02 -6.43e-01 -2.51e-01 -6.18e-01   ph/cm2/s
      90%_error_hi   1.02e-01  9.29e-02  9.32e-02  1.60e-01  2.44e-01  3.88e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  198.2827     8.1976   0.0067    26.1407    16.5987         3.5298217     28.714 TRIG_00622006                 
 
Foreground time interval of the image:
-24.112  16.397 (delta_t =  40.509 [sec])
Background time interval of the image:
-66.603 -24.112 (delta_t =  42.491 [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  -24.112 sec. to   20.332 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.7362     ( -0.0842692   0.0833918 )
Norm@50keV  : 5.14748E-03    ( -0.000250348   0.000249051 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          73.00 using 59 PHA bins.
# Reduced chi-squared =          1.281 for     57 degrees of freedom 
# Null hypothesis probability =   7.509017e-02
 
Photon flux (15-150 keV)    in 44.44 sec: 0.692551 ( -0.032416  0.032467 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.11288e-06 ( -1.06724e-07  1.07332e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from  -24.112 sec. to   20.332 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.25574     ( -0.351691   0.385008 )
Epeak [keV] : 72.8390      ( -14.4244 67.5812 )
Norm@50keV  : 9.20353E-03    ( -0.00312842   0.00536033 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          67.42 using 59 PHA bins.
# Reduced chi-squared =          1.204 for     56 degrees of freedom 
# Null hypothesis probability =   1.411597e-01
 
Photon flux (15-150 keV)    in 44.44 sec: 0.673927 ( -0.035061  0.035041 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.0189e-06 ( -1.26012e-07  1.26434e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   -0.096 sec. to    0.904 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.13067     ( -0.133737   0.135538 )
Norm@50keV  : 2.62627E-02    ( -0.00199174   0.00199132 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          63.12 using 59 PHA bins.
# Reduced chi-squared =          1.107 for     57 degrees of freedom 
# Null hypothesis probability =   2.689130e-01
 
Photon flux (15-150 keV)    in 1 sec: 3.05599 ( -0.23755  0.23793 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.71982e-07 ( -2.30332e-08  2.31933e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -0.096 sec. to    0.904 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.07996     ( -0.173557   0.528056 )
Epeak [keV] : 979.872      ( -990.098 -990.098 )
Norm@50keV  : 2.77736E-02    ( -0.00319263   0.0210254 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          63.13 using 59 PHA bins.
# Reduced chi-squared =          1.127 for     56 degrees of freedom 
# Null hypothesis probability =   2.391120e-01
 
Photon flux (15-150 keV)    in 1 sec: 3.05396 ( -0.25055  0.24392 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.71063e-07 ( -2.45102e-08  2.39424e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = N/A sec.
Hardness ratio (energy fluence ratio) = N/A

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

S(15-50 keV)  = N/A
S(50-150 keV) = N/A

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 = 4.703254137966747E-01, IMY = -1.401982135373573E-01

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:
-66.603390 -24.112000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.3701  35.2671    6.6  31.8 -154.8   0.1631   1.8    6.2	Her X-1                       
185.8414 -15.0699    2.5  51.6    5.5   1.0511   4.5 ------	UNKNOWN                       
234.5494 -18.3945    2.3  45.7  -57.7   1.8838   5.0 ------	UNKNOWN                       

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

Time interval of the image:
-24.112000 16.396600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.5156  35.5474    0.0  32.0 -155.2   0.2154   1.7   12.6	Her X-1                       
192.0431  46.0526    2.0  30.4  103.6   1.1430   5.6 ------	UNKNOWN                       
200.8048  52.9555    2.3  31.4  121.0   0.9856   5.0 ------	UNKNOWN                       
198.2827   8.1976    0.4  26.1   16.6   3.5299  28.7 ------	UNKNOWN                       
230.4463 -18.4867    2.2  44.7  -52.4   1.8756   5.2 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
63.596600 645.396610
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4906  35.3580    8.3  57.9 -153.4   4.2442   1.4    1.9	Her X-1                       
232.6970  55.0447    4.1  54.2  177.0   5.3318   2.8 ------	UNKNOWN                       
196.0271   0.3009    3.4   8.2  -10.5   1.6334   3.5 ------	UNKNOWN                       
220.9423  20.5538    2.8  25.1 -148.4   2.0201   4.1 ------	UNKNOWN                       
251.3387  46.0373    2.7  59.0 -166.1  13.1148   4.3 ------	UNKNOWN                       
253.6401  38.2412    3.7  58.0 -156.8   9.9217   3.2 ------	UNKNOWN                       
197.4255 -50.5353    5.2  58.7  -25.9   7.2810   2.2 ------	UNKNOWN                       
209.2816 -45.2009    2.6  54.3  -36.0  12.7612   4.5 ------	UNKNOWN                       
244.1125   9.2356    3.7  45.3 -121.4   5.8572   3.1 ------	UNKNOWN                       
246.8965  14.8077    3.5  48.0 -129.1   8.1050   3.3 ------	UNKNOWN