GRB140916A: 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: Mon Oct 13 20:08:17 EDT 2014
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger612804
======================================================================

  Trigger: 00612804      Segment: 000

  BAT Trigger Time: 432557040   [s; MET]
      Trigger Stop: 432557104   [s; MET]
               UTC: 2014-09-16T10:43:47.465980    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 40.4046851109949   Dec: -39.7108825055143  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.87
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    7.87

  Analysis Position:   [ source = BAT ]
    RA: 40.4046851109949   Dec: -39.7108825055143  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 40.3815347721801   Dec: -39.6916256692869  [deg; J2000]  
        { 02h 41m 31.6s , -39d 41' 29.9" }
         +/- 2.56848589688681 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.37987343624611 [arcmin] (formal 1-sigma fit error)
    SNR: 7.9043335401123
 
  Angular difference between the analysis and refined position is 1.573873 arcmin
 
  Partial Coding Fraction: 0.1660156    [ including projection effects ]

  Duration
     T90: 68.9760000109673 +/- 9.4507904787089
        Measured from: 1.24000000953674
                   to: 70.216000020504     [s; relative to TRIGTIME]
     T50: 42.3199999928474 +/- 19.2555081356513
        Measured from: 8.77600002288818
                   to: 51.0960000157356     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 1.80400002002716     
                   to: 2.80400002002716     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.903999984264374     
                   to: 79.0640000104904     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.815070   1.148108   0.496769   0.005277
           0.133564   0.136449   0.118406   0.099243 [error]
 Peak      0.048854   0.057685   0.042633   0.018520
           0.014775   0.015920   0.013640   0.011282 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   79.968   -0.904   79.064
T90    68.976    1.240   70.216
T50    42.320    8.776   51.096
Peak    1.000    1.804    2.804
 
 
====== 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      -2.145    -0.305      0.276       -           -               -         2.00e-03     -4.02e-04          3.87e-04      60.620   57
CPL     -1.129    -1.039      1.772       36.954     -23.673        25.825      7.48e-03     -7.48e-03          7.31e-02      58.580   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      -1.811     -0.540     0.490       -           -               -         9.80e-03     -3.32e-03          3.20e-03      48.120   57
CPL     -0.368     -1.808     4.455       52.920      N/A           N/A         5.77e-02        N/A               N/A         47.110   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   3.76e-07  4.68e-07  4.23e-07  6.65e-07  1.50e-06  1.93e-06   erg/cm2
      90%_error_low -7.81e-08 -7.22e-08 -1.12e-07 -2.92e-07 -2.62e-07 -4.43e-07   erg/cm2
      90%_error_hi   8.15e-08  7.20e-08  1.15e-07  4.05e-07  2.68e-07  5.22e-07   erg/cm2
Peak flux       PL   5.44e-01  4.56e-01  2.60e-01  2.20e-01  1.36e+00  1.48e+00   ph/cm2/s
      90%_error_low -2.35e-01 -1.42e-01 -1.08e-01 -1.36e-01 -4.20e-01 -4.50e-01   ph/cm2/s
      90%_error_hi   2.61e-01  1.41e-01  1.07e-01  2.15e-01  4.22e-01  4.50e-01   ph/cm2/s
 
Fluence        CPL   3.38e-07  5.25e-07  4.16e-07  1.69e-07  1.40e-06  1.45e-06   erg/cm2
      90%_error_low -9.27e-08 -9.17e-08 -1.43e-07 -1.45e-07 -2.75e-07 -3.20e-07   erg/cm2
      90%_error_hi   9.33e-08  1.06e-07  1.31e-07  6.73e-07  2.90e-07  7.50e-07   erg/cm2
Peak flux      CPL   4.42e-01  5.31e-01  2.82e-01  6.03e-02  1.30e+00  1.32e+00   ph/cm2/s
      90%_error_low     N/A   -2.80e-01     N/A   -6.03e-02 -4.38e-01 -4.48e-01   ph/cm2/s
      90%_error_hi      N/A    2.05e-01     N/A    2.22e-01  4.34e-01  5.17e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
   40.3815   -39.6916   0.0243    47.7545    18.6216         2.2270323      7.904 TRIG_00612804                 
 
Foreground time interval of the image:
 -0.904  73.501 (delta_t =  74.405 [sec])
Background time interval of the image:
-210.699  -0.904 (delta_t = 209.795 [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   -0.904 sec. to   79.064 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.1447     ( -0.305293   0.27554 )
Norm@50keV  : 2.00221E-03    ( -0.000401574   0.000387371 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.62 using 59 PHA bins.
# Reduced chi-squared =          1.063 for     57 degrees of freedom 
# Null hypothesis probability =   3.468272e-01
 
Photon flux (15-150 keV)    in 79.97 sec: 0.322161 ( -0.049545  0.0496 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.49506e-06 ( -2.62101e-07  2.67802e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -0.904 sec. to   79.064 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.12917     ( -1.03877   1.77246 )
Epeak [keV] : 36.9544      ( -23.6729 25.8244 )
Norm@50keV  : 7.47819E-03    ( -0.00747819   0.0730992 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.58 using 59 PHA bins.
# Reduced chi-squared =          1.046 for     56 degrees of freedom 
# Null hypothesis probability =   3.809019e-01
 
Photon flux (15-150 keV)    in 79.97 sec: 0.310779 ( -0.051699  0.051489 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.3981e-06 ( -2.75365e-07  2.90035e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    1.804 sec. to    2.804 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.81076     ( -0.540039   0.489968 )
Norm@50keV  : 9.80008E-03    ( -0.00331742   0.00319736 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          48.12 using 59 PHA bins.
# Reduced chi-squared =         0.8442 for     57 degrees of freedom 
# Null hypothesis probability =   7.926684e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.35617 ( -0.420349  0.4219 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.02028e-08 ( -2.99219e-08  3.05619e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    1.804 sec. to    2.804 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.367986     ( -1.81264   4.45052 )
Epeak [keV] : 52.9200      (   )
Norm@50keV  : 5.76919E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          47.11 using 59 PHA bins.
# Reduced chi-squared =         0.8412 for     56 degrees of freedom 
# Null hypothesis probability =   7.954598e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.30422 ( -0.438153  0.43373 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.39634e-08 ( -2.93889e-08  3.22617e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 68.976 sec.
Hardness ratio (energy fluence ratio) = 0.904607181449

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

S(15-50 keV)  = 8.435804e-07
S(50-150 keV) = 6.514957e-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 = 1.043444517497601E+00, IMY = -3.515964587179286E-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:
-210.699400 -0.904000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6289  22.0221    0.3  27.7 -137.9   9.0859  43.7    0.5	Crab                          
 39.9199  29.6546    2.6  33.7  138.9   1.3430   4.5 ------	UNKNOWN                       
 49.7475  12.2427    2.2  15.2  121.2   0.9757   5.3 ------	UNKNOWN                       
 63.4884  50.8636    2.5  47.3  176.6   1.7531   4.6 ------	UNKNOWN                       
 63.0470 -28.0591    2.9  31.6   -5.4   0.8927   4.0 ------	UNKNOWN                       
 73.8794 -49.7625    2.7  54.2  -13.4   2.4923   4.3 ------	UNKNOWN                       
 87.8873 -50.8579    2.5  58.6  -22.9   5.3814   4.7 ------	UNKNOWN                       
 92.6944 -23.9930    2.6  40.4  -49.7   1.6628   4.4 ------	UNKNOWN                       
105.2633  22.1145    3.2  45.5 -122.2   2.8392   3.6 ------	UNKNOWN                       

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

Time interval of the image:
-0.904000 73.500600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.5769  22.1722   20.6  27.7 -138.3  -0.0683  -0.6   10.0	Crab                          
 40.3815 -39.6916    1.5  47.8   18.6   2.2247   7.9 ------	UNKNOWN                       
 43.8640 -32.8100    1.8  40.4   20.0   1.1016   6.5 ------	UNKNOWN                       
 74.0548 -11.0610    1.7  18.7  -42.6   0.6514   6.8 ------	UNKNOWN                       
101.5087  -8.4953    2.5  40.8  -76.9   1.7049   4.7 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
139.900600 963.060000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 28.1916  -8.7609    3.0  32.8  128.2   3.0741   3.8 ------	UNKNOWN                       
 60.0980  14.0589    2.9  56.8  173.9  11.7086   3.9 ------	UNKNOWN                       
 14.9431 -54.6662    3.2  22.6   11.1   1.6557   3.6 ------	UNKNOWN                       
 25.2568 -59.1229    3.7  21.6   -7.8   1.5875   3.1 ------	UNKNOWN                       
 88.4861  -8.0817    3.6  53.2 -142.2   9.5832   3.2 ------	UNKNOWN                       
 91.2617 -19.2635    3.9  48.0 -129.0   7.5120   3.0 ------	UNKNOWN                       
 93.8916 -34.1141    3.0  42.5 -109.2   9.3749   3.9 ------	UNKNOWN