GRB141026A: 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: Wed Nov 19 23:06:53 EST 2014
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger616502
======================================================================

  Trigger: 00616502      Segment: 000

  BAT Trigger Time: 435983824   [s; MET]
      Trigger Stop: 435983888   [s; MET]
               UTC: 2014-10-26T02:36:51.296880    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 44.0804525026473   Dec: 26.9599053858768  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    11
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    11

  Analysis Position:   [ source = BAT ]
    RA: 44.0804525026473   Dec: 26.9599053858768  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 44.0490065807522   Dec: 26.9251941472626  [deg; J2000]  
        { 02h 56m 11.8s , +26d 55' 30.7" }
         +/- 1.86368916202356 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.733732141123246 [arcmin] (formal 1-sigma fit error)
    SNR: 12.4988642699834
 
  Angular difference between the analysis and refined position is 2.677042 arcmin
 
  Partial Coding Fraction: 0.8828125    [ including projection effects ]

  Duration
     T90: 139.475999951363 +/- 14.8381213498224
        Measured from: 21.7400000095367
                   to: 161.215999960899     [s; relative to TRIGTIME]
     T50: 72.7679999470711 +/- 12.4589060727686
        Measured from: 55.5199999809265
                   to: 128.287999927998     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 65.6399999856949     
                   to: 66.6399999856949     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 13.9559999704361     
                   to: 180.89200001955     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.307293   1.054742   0.391654   0.208802
           0.075008   0.076729   0.065638   0.056640 [error]
 Peak      0.023157   0.007280   0.014637   0.005430
           0.006167   0.006204   0.005165   0.004561 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  166.936   13.956  180.892
T90   139.476   21.740  161.216
T50    72.768   55.520  128.288
Peak    1.000   65.640   66.640
 
 
====== 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      -2.331    -0.193      0.182       -           -               -         8.07e-04     -1.04e-04          1.02e-04      62.020   57
CPL     -1.992     1.992      1.992        0.923      -0.361         1.475      1.29e-03     -2.41e-04          2.69e-04      63.300   56
 
 
=== 1-s peak 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      -1.243     -0.827     1.082       -           -               -         3.03e-03     -1.11e-03          1.11e-03      50.880   57
CPL     -1.307     -2.239     1.200     9999.360      N/A           N/A         3.04e-03        N/A               N/A         50.910   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   3.78e-07  4.20e-07  3.34e-07  4.40e-07  1.29e-06  1.57e-06   erg/cm2
      90%_error_low -4.26e-08 -3.70e-08 -5.87e-08 -1.34e-07 -1.30e-07 -2.12e-07   erg/cm2
      90%_error_hi   4.35e-08  3.66e-08  6.14e-08  1.72e-07  1.34e-07  2.40e-07   erg/cm2
Peak flux       PL   9.75e-02  1.14e-01  9.68e-02  1.39e-01  3.58e-01  4.47e-01   ph/cm2/s
      90%_error_low -9.75e-02 -6.42e-02 -4.68e-02 -1.03e-01 -3.58e-01 -1.69e-01   ph/cm2/s
      90%_error_hi   8.84e-02  5.01e-02  4.22e-02  2.84e-01  1.38e-01  1.97e-01   ph/cm2/s
 
Fluence        CPL   3.66e-07  4.27e-07  2.99e-07  6.32e-08  1.24e-06  1.37e-06   erg/cm2
      90%_error_low -3.94e-08 -2.94e-08 -4.46e-08 4.81e-08 -1.31e-07 -2.17e-07   erg/cm2
      90%_error_hi   4.06e-08  4.50e-08  9.45e-08  4.12e-07  1.61e-07  2.64e-07   erg/cm2
Peak flux      CPL   9.86e-02  1.15e-01  9.63e-02  1.36e-01  3.59e-01  4.55e-01   ph/cm2/s
      90%_error_low     N/A   -6.45e-02 -4.65e-02     N/A   -1.40e-01 -1.82e-01   ph/cm2/s
      90%_error_hi      N/A    4.98e-02  4.27e-02     N/A    1.38e-01  1.94e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
   44.0490    26.9252   0.0154    15.7411   128.8679         1.2234431     12.499 TRIG_00616502                 
 
Foreground time interval of the image:
 13.956  73.501 (delta_t =  59.545 [sec])
Background time interval of the image:
-239.000  13.956 (delta_t = 252.956 [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   13.956 sec. to  180.892 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.33101     ( -0.192527   0.181645 )
Norm@50keV  : 8.06691E-04    ( -0.000104014   0.000102215 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          62.02 using 59 PHA bins.
# Reduced chi-squared =          1.088 for     57 degrees of freedom 
# Null hypothesis probability =   3.018389e-01
 
Photon flux (15-150 keV)    in 166.9 sec: 0.143466 ( -0.011754  0.011758 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.29451e-06 ( -1.30451e-07  1.34073e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   13.956 sec. to  180.892 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.99196     ( 1.99196   1.99196 )
Epeak [keV] : 0.922985      ( -0.361087 1.47496 )
Norm@50keV  : 1.28516E-03    ( -0.000240734   0.000269017 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          63.30 using 59 PHA bins.
# Reduced chi-squared =          1.130 for     56 degrees of freedom 
# Null hypothesis probability =   2.344792e-01
 
Photon flux (15-150 keV)    in 166.9 sec: 0.141335 ( -0.011971  0.011087 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.2393e-06 ( -1.30823e-07  1.60921e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   65.640 sec. to   66.640 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.24339     ( -0.82823   1.08134 )
Norm@50keV  : 3.03213E-03    ( -0.00110554   0.00110553 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.88 using 59 PHA bins.
# Reduced chi-squared =         0.8926 for     57 degrees of freedom 
# Null hypothesis probability =   7.026515e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.358137 ( -0.358137  0.13841 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.04166e-08 ( -1.27175e-08  1.30334e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   65.640 sec. to   66.640 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.08324     ( -1.46294   1.97567 )
Epeak [keV] : 31.1796      (   )
Norm@50keV  : 1.17099E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.56 using 59 PHA bins.
# Reduced chi-squared =         0.9029 for     56 degrees of freedom 
# Null hypothesis probability =   6.801565e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.358639 ( -0.14005  0.137885 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.02489e-08 ( 0  0 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 139.476 sec.
Hardness ratio (energy fluence ratio) = 0.795005171463

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

S(15-50 keV)  = 7.977943e-07
S(50-150 keV) = 4.967345e-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 = -1.768756455081310E-01, IMY = -2.194556478470043E-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:
-239.000000 13.956000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6244  22.0246    0.3  29.2 -126.5  10.5825  36.5    0.8	Crab                          
 12.7527  21.0362    2.2  39.8   89.3   5.1635   5.2 ------	UNKNOWN                       
 71.2178  65.7906    2.5  52.9  172.2   3.5691   4.6 ------	UNKNOWN                       
 84.7049 -18.8240    2.9  44.8  -59.9   3.8004   4.0 ------	UNKNOWN                       
 86.1607 -15.6261    3.1  43.6  -64.6   3.6974   3.7 ------	UNKNOWN                       

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

Time interval of the image:
13.956000 73.500590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6603  22.1592   18.0  29.2 -126.7   0.0763   0.6    8.8	Crab                          
 44.0490  26.9252    0.9  15.7  128.9   1.2235  12.5 ------	UNKNOWN                       
 68.5836  60.6922    2.0  47.7  173.0   1.1244   5.6 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
143.500620 209.700600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6558  22.0241    0.6  36.2  -44.8   2.5262  18.2    1.4	Crab                          
 55.6597   8.3687    2.7  21.6   13.6   0.3945   4.2 ------	UNKNOWN                       
 44.0727  26.8854    2.0   0.1   76.4   0.5237   5.7 ------	UNKNOWN                       
 51.4491  22.9167    2.7   7.8  -14.1   0.3738   4.3 ------	UNKNOWN                       
 53.4008  23.3313    3.0   9.1  -22.5   0.3298   3.8 ------	UNKNOWN                       
 69.0913  10.4814    2.4  28.7  -13.6   0.4742   4.9 ------	UNKNOWN                       
356.5166  57.6945    2.8  45.2 -167.6   0.6547   4.0 ------	UNKNOWN                       
 90.7826   4.3440    2.5  49.9  -25.3   0.9168   4.6 ------	UNKNOWN