GRB140118A: 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 Mar  3 23:46:38 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger584136
======================================================================

  Trigger: 00584136      Segment: 000

  BAT Trigger Time: 411701534.272   [s; MET]
      Trigger Stop: 411701538.368   [s; MET]
               UTC: 2014-01-18T01:32:02.739660    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 331.002867245394   Dec: -17.9476181313747  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    10.36
     Image Trigger?:     NO
     Rate S/N Ratio:     13.2664991614216  [ if not an image trigger ]
     Image S/N Ratio:    10.36

  Analysis Position:   [ source = BAT ]
    RA: 331.002867245394   Dec: -17.9476181313747  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 330.994875458674   Dec: -17.9366285069206  [deg; J2000]  
        { 22h 03m 58.8s , -17d 56' 11.9" }
         +/- 1.48475331209473 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.71695158073747 [arcmin] (formal 1-sigma fit error)
    SNR: 17.2940992678807
 
  Angular difference between the analysis and refined position is 0.801802 arcmin
 
  Partial Coding Fraction: 0.4101562    [ including projection effects ]

  Duration
     T90: 84.0919999480247 +/- 9.74659838496785
        Measured from: -61.0160000324249
                   to: 23.0759999155998     [s; relative to TRIGTIME]
     T50: 23.2119999527931 +/- 16.2059733454663
        Measured from: -15.3040000200272
                   to: 7.90799993276596     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 2.98399996757507     
                   to: 3.98399996757507     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -73.6080000400543     
                   to: 29.3679999709129     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.405480   1.749499   0.968867   0.245281
           0.099448   0.102714   0.090509   0.083383 [error]
 Peak      0.072627   0.082345   0.054684   0.015071
           0.010808   0.011128   0.009995   0.008537 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  102.976  -73.608   29.368
T90    84.092  -61.016   23.076
T50    23.212  -15.304    7.908
Peak    1.000    2.984    3.984
 
 
====== 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      -1.872    -0.134      0.130       -           -               -         2.71e-03     -2.22e-04          2.19e-04      56.990   57
CPL     -1.357    -0.546      0.634       55.596     -13.083       -55.596      5.20e-03     -2.54e-03          6.33e-03      54.440   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      -1.717     -0.267     0.255       -           -               -         1.45e-02     -2.36e-03          2.30e-03      54.140   57
CPL     -1.657     -1.265     0.853      275.255      N/A           N/A         1.56e-02        N/A               N/A         54.170   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   5.06e-07  7.41e-07  8.10e-07  1.66e-06  2.56e-06  3.71e-06   erg/cm2
      90%_error_low -5.47e-08 -5.24e-08 -9.01e-08 -3.49e-07 -2.08e-07 -4.42e-07   erg/cm2
      90%_error_hi   5.62e-08  5.24e-08  9.06e-08  4.07e-07  2.10e-07  4.86e-07   erg/cm2
Peak flux       PL   7.35e-01  6.50e-01  3.96e-01  3.65e-01  1.94e+00  2.15e+00   ph/cm2/s
      90%_error_low -1.65e-01 -9.64e-02 -8.33e-02 -1.32e-01 -2.84e-01 -3.15e-01   ph/cm2/s
      90%_error_hi   1.73e-01  9.60e-02  8.23e-02  1.70e-01  2.85e-01  3.16e-01   ph/cm2/s
 
Fluence        CPL   4.75e-07  7.84e-07  8.07e-07  7.28e-07  2.44e-06  2.79e-06   erg/cm2
      90%_error_low -6.41e-08 -6.92e-08 -9.96e-08 -4.02e-07 -2.43e-07 -4.79e-07   erg/cm2
      90%_error_hi   6.46e-08  7.13e-08  9.76e-08  1.02e-06  2.47e-07  1.03e-06   erg/cm2
Peak flux      CPL   7.38e-01  6.47e-01  3.95e-01  3.79e-01  1.94e+00  2.17e+00   ph/cm2/s
      90%_error_low -1.80e-01 -9.46e-02 -8.44e-02     N/A   -2.94e-01 -3.41e-01   ph/cm2/s
      90%_error_hi   1.71e-01  1.20e-01  9.20e-02     N/A    2.86e-01  2.88e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  330.9949   -17.9366   0.0111    36.2914  -127.0703         4.4604631     17.294 TRIG_00584136                 
 
Foreground time interval of the image:
-73.608  29.368 (delta_t = 102.976 [sec])
Background time interval of the image:
-239.272 -73.608 (delta_t = 165.664 [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  -73.608 sec. to   29.368 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.87224     ( -0.13364   0.130094 )
Norm@50keV  : 2.70762E-03    ( -0.000221524   0.000218658 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.99 using 59 PHA bins.
# Reduced chi-squared =         0.9999 for     57 degrees of freedom 
# Null hypothesis probability =   4.752809e-01
 
Photon flux (15-150 keV)    in 103 sec: 0.384096 ( -0.027633  0.027665 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.56424e-06 ( -2.07575e-07  2.0996e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from  -73.608 sec. to   29.368 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.35697     ( -0.545546   0.634244 )
Epeak [keV] : 55.5965      ( -13.0826 -55.5965 )
Norm@50keV  : 5.19533E-03    ( -0.0025382   0.00632753 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.44 using 59 PHA bins.
# Reduced chi-squared =         0.9721 for     56 degrees of freedom 
# Null hypothesis probability =   5.342788e-01
 
Photon flux (15-150 keV)    in 103 sec: 0.374636 ( -0.029461  0.029377 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.43903e-06 ( -2.42904e-07  2.46854e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    2.984 sec. to    3.984 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.71658     ( -0.267213   0.255243 )
Norm@50keV  : 1.44921E-02    ( -0.00236442   0.00230367 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.14 using 59 PHA bins.
# Reduced chi-squared =         0.9498 for     57 degrees of freedom 
# Null hypothesis probability =   5.831314e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.93608 ( -0.28436  0.28457 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.34032e-07 ( -2.25332e-08  2.28272e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    2.984 sec. to    3.984 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.65651     ( -1.25656   0.861946 )
Epeak [keV] : 275.255      (   )
Norm@50keV  : 1.55920E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.16 using 59 PHA bins.
# Reduced chi-squared =         0.9672 for     56 degrees of freedom 
# Null hypothesis probability =   5.447571e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.93854 ( -0.29393  0.28634 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.3436e-07 ( -2.42061e-08  1.94944e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 84.092 sec.
Hardness ratio (energy fluence ratio) = 1.09262209665

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

S(15-50 keV)  = 1.2466622e-06
S(50-150 keV) = 1.3175721e-06

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 = -4.426582386676653E-01, IMY = 5.859297902425955E-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:
-239.272000 -73.608000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.4921  35.2083    2.9  43.5  -22.9   1.1002   4.0    4.8	Cyg X-1                       
308.0820  41.0314    2.8  39.3  -11.0   0.9659   4.2    4.9	Cyg X-3                       
326.1054  38.3295    2.4  26.9    1.4   0.8773   4.8    3.2	Cyg X-2                       
308.0604  37.6114    2.2  37.8  -15.9   1.0908   5.2 ------	UNKNOWN                       
355.3846 -23.6250    3.1  41.5 -164.0   1.0163   3.7 ------	UNKNOWN                       
293.6315  15.4907    4.3  47.8  -51.0   2.2469   2.7 ------	UNKNOWN                       
328.9294 -30.1498    2.4  48.4 -130.5   3.9122   4.9 ------	UNKNOWN                       

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

Time interval of the image:
-73.608000 29.368000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.5367  35.4073    0.0  43.5  -22.6  -0.4750  -1.9   12.6	Cyg X-1                       
307.9522  41.0306    6.0  39.4  -11.1  -0.4070  -1.9    8.5	Cyg X-3                       
326.4265  38.2952    0.0  26.7    1.8   0.3140   1.9   12.1	Cyg X-2                       
  7.4811  28.3132    2.4  25.2   89.8   0.9675   4.8 ------	UNKNOWN                       
330.9961 -17.9381    0.7  36.3 -127.1   4.4522  17.3 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
909.228590 962.769600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5010 -40.4862    2.5  47.8  149.7   1.4678   4.5    4.3	Vela X-1                      
170.5079 -60.6493    6.1  48.8 -170.6  -0.3746  -1.9    5.9	Cen X-3                       
186.4770 -62.8121   15.4  51.9 -161.2  -0.1683  -0.8    5.5	GX 301-2