GRB150211A: 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 Mar  1 21:56:15 EST 2015
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger630714
======================================================================

  Trigger: 00630714      Segment: 000

  BAT Trigger Time: 445348344.704   [s; MET]
      Trigger Stop: 445348345.728   [s; MET]
               UTC: 2015-02-11T11:52:11.531900    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 254.855542489134   Dec: 55.383164888961  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    18.82
     Image Trigger?:     NO
     Rate S/N Ratio:     50.5272203866391  [ if not an image trigger ]
     Image S/N Ratio:    18.82

  Analysis Position:   [ source = BAT ]
    RA: 254.855542489134   Dec: 55.383164888961  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 254.844785667659   Dec: 55.3891668265678  [deg; J2000]  
        { 16h 59m 22.7s , +55d 23' 21.0" }
         +/- 0.851385500084117 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.29081815619934 [arcmin] (formal 1-sigma fit error)
    SNR: 38.2770115877447
 
  Angular difference between the analysis and refined position is 0.513901 arcmin
 
  Partial Coding Fraction: 0.1640625    [ including projection effects ]

  Duration
     T90: 13.607999920845 +/- 2.01603178353838
        Measured from: -6.69599997997284
                   to: 6.91199994087219     [s; relative to TRIGTIME]
     T50: 6.45999997854233 +/- 0.314197384965821
        Measured from: -1.47600001096725
                   to: 4.98399996757507     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 4.36000001430511     
                   to: 5.36000001430511     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -11.6240000128746     
                   to: 9.18000000715256     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.473408   3.206558   3.145155   0.975712
           0.076228   0.088533   0.085224   0.070784 [error]
 Peak      0.263543   0.526947   0.514016   0.106883
           0.022075   0.027436   0.027392   0.019476 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   20.804  -11.624    9.180
T90    13.608   -6.696    6.912
T50     6.460   -1.476    4.984
Peak    1.000    4.360    5.360
 
 
====== 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      -1.283    -0.053      0.053       -           -               -         3.20e-02     -1.00e-03          1.00e-03      97.080   57
CPL     -0.620    -0.228      0.240      119.788     -17.452        32.583      6.30e-02     -1.28e-02          1.69e-02      70.230   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      -1.346     -0.090     0.090       -           -               -         1.05e-01     -6.01e-03          6.01e-03      74.890   57
CPL     -0.298     -0.411     0.453       88.835     -12.356        23.441      3.27e-01     -1.15e-01          1.98e-01      53.390   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   6.93e-07  1.46e-06  2.39e-06  8.89e-06  6.60e-06  1.34e-05   erg/cm2
      90%_error_low -4.23e-08 -5.46e-08 -8.35e-08 -6.67e-07 -2.14e-07 -7.14e-07   erg/cm2
      90%_error_hi   4.32e-08  5.44e-08  8.32e-08  7.01e-07  2.14e-07  7.42e-07   erg/cm2
Peak flux       PL   3.72e+00  4.10e+00  3.23e+00  4.19e+00  1.26e+01  1.52e+01   ph/cm2/s
      90%_error_low -3.70e-01 -2.66e-01 -2.13e-01 -5.24e-01 -7.50e-01 -8.87e-01   ph/cm2/s
      90%_error_hi   3.81e-01  2.65e-01  2.12e-01  5.63e-01  7.51e-01  8.89e-01   ph/cm2/s
 
Fluence        CPL   5.87e-07  1.52e-06  2.57e-06  4.29e-06  6.45e-06  8.97e-06   erg/cm2
      90%_error_low -5.24e-08 -6.10e-08 -1.04e-07 -8.51e-07 -2.24e-07 -8.56e-07   erg/cm2
      90%_error_hi   5.38e-08  6.14e-08  1.05e-07  1.11e-06  2.24e-07  1.10e-06   erg/cm2
Peak flux      CPL   2.95e+00  4.45e+00  3.66e+00  1.82e+00  1.22e+01  1.29e+01   ph/cm2/s
      90%_error_low -4.46e-01 -3.13e-01 -2.74e-01 -4.81e-01 -7.62e-01 -9.09e-01   ph/cm2/s
      90%_error_hi   4.62e-01  3.17e-01  2.79e-01  6.48e-01  7.63e-01  9.68e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  254.8448    55.3892   0.0050    49.5577    13.3190         9.2162189     38.277 TRIG_00630714                 
 
Foreground time interval of the image:
-11.624   9.180 (delta_t =  20.804 [sec])
Background time interval of the image:
-239.704 -11.624 (delta_t = 228.080 [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  -11.624 sec. to    9.180 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.28292     ( -0.0526384   0.052872 )
Norm@50keV  : 3.19790E-02    ( -0.00100379   0.0010033 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          97.08 using 59 PHA bins.
# Reduced chi-squared =          1.703 for     57 degrees of freedom 
# Null hypothesis probability =   7.394205e-04
 
Photon flux (15-150 keV)    in 20.8 sec: 3.80348 ( -0.12874  0.129 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.60167e-06 ( -2.13988e-07  2.14074e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from  -11.624 sec. to    9.180 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.620281     ( -0.227836   0.240136 )
Epeak [keV] : 119.788      ( -17.4527 32.5829 )
Norm@50keV  : 6.30135E-02    ( -0.0127839   0.0169074 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          70.23 using 59 PHA bins.
# Reduced chi-squared =          1.254 for     56 degrees of freedom 
# Null hypothesis probability =   9.565443e-02
 
Photon flux (15-150 keV)    in 20.8 sec: 3.68652 ( -0.13338  0.13378 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.44694e-06 ( -2.24318e-07  2.23791e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    4.360 sec. to    5.360 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.34597     ( -0.0897011   0.0895191 )
Norm@50keV  : 0.104675    ( -0.00601361   0.00601289 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          74.89 using 59 PHA bins.
# Reduced chi-squared =          1.314 for     57 degrees of freedom 
# Null hypothesis probability =   5.616205e-02
 
Photon flux (15-150 keV)    in 1 sec: 12.6002 ( -0.7501  0.751 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.02339e-06 ( -6.29948e-08  6.31607e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    4.360 sec. to    5.360 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.298084     ( -0.411454   0.453369 )
Epeak [keV] : 88.8347      ( -12.3561 23.4413 )
Norm@50keV  : 0.326559    ( -0.11493   0.198044 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.39 using 59 PHA bins.
# Reduced chi-squared =         0.9533 for     56 degrees of freedom 
# Null hypothesis probability =   5.744031e-01
 
Photon flux (15-150 keV)    in 1 sec: 12.2437 ( -0.7617  0.7628 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.91928e-07 ( -6.61007e-08  6.60095e-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 = 1.141683724180611E+00, IMY = -2.702815977919790E-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:
-239.704000 -11.624000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.6071  35.1968    3.1  48.9  -35.5   2.0686   3.8    0.9	Cyg X-1                       
308.2225  40.9583    2.7  40.3  -39.0   1.2917   4.3    5.1	Cyg X-3                       
326.2039  38.1752   11.3  35.2  -60.6  -0.3298  -1.0    8.9	Cyg X-2                       
278.3379  67.9419    2.1  33.0   13.6   1.2485   5.4 ------	UNKNOWN                       
 30.8390  47.3370    3.1  21.4 -172.5   0.7073   3.7 ------	UNKNOWN                       
 29.0349  27.9877    2.3  38.9 -155.2   1.3431   5.1 ------	UNKNOWN                       

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

Time interval of the image:
-11.624000 9.180000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.3699  35.2885    7.7  48.9  -35.2   0.2663   1.5   12.0	Cyg X-1                       
308.0553  40.8157   17.0  40.5  -39.0  -0.0691  -0.7    8.6	Cyg X-3                       
326.3302  38.3896    6.1  35.0  -60.6  -0.1954  -1.9    8.5	Cyg X-2                       
 97.6659  63.9076    2.5  36.4  105.0   0.7930   4.7 ------	UNKNOWN                       
 63.1655  23.1180    2.4  54.9  167.6   1.5331   4.9 ------	UNKNOWN                       
254.8448  55.3892    0.3  49.6   13.3   9.2167  38.3 ------	UNKNOWN                       
 19.0556  62.2254    2.1   5.9  160.6   0.3326   5.5 ------	UNKNOWN                       
285.7303  46.4218    2.5  45.6  -15.1   0.5801   4.7 ------	UNKNOWN                       
 13.0558  36.6255    2.7  27.8 -133.9   0.3243   4.2 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
809.496610 962.374400
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6351  22.0092    0.7  48.4 -157.5   5.6660  16.5    0.3	Crab                          
189.3679  13.4991    3.1  51.0   31.1   3.0779   3.7 ------	UNKNOWN                       
174.6777  31.0037    2.4  31.5   14.9   0.8398   4.8 ------	UNKNOWN                       
 89.6394  44.3433    2.3  38.3 -127.3   1.2812   5.0 ------	UNKNOWN                       
151.3481  76.2895    3.2  43.7  -63.9   2.4864   3.6 ------	UNKNOWN                       
163.7985  76.3338    2.5  44.9  -60.1   3.0340   4.7 ------	UNKNOWN