GRB140515A: 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: Sat Oct  4 22:54:33 EDT 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger599037
======================================================================

  Trigger: 00599037      Segment: 000

  BAT Trigger Time: 421837968.704   [s; MET]
      Trigger Stop: 421837969.728   [s; MET]
               UTC: 2014-05-15T09:12:36.691200    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 186.03622967468   Dec: 15.0772932428  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.23
     Image Trigger?:     NO
     Rate S/N Ratio:     13.8924439894498  [ if not an image trigger ]
     Image S/N Ratio:    8.23

  Analysis Position:   [ source = BAT ]
    RA: 186.03622967468   Dec: 15.0772932428  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 186.069029014688   Dec: 15.0996736442334  [deg; J2000]  
        { 12h 24m 16.6s , +15d 05' 58.8" }
         +/- 1.21898622557002 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.438391306096349 [arcmin] (formal 1-sigma fit error)
    SNR: 22.9225513371504
 
  Angular difference between the analysis and refined position is 2.326717 arcmin
 
  Partial Coding Fraction: 0.9921875    [ including projection effects ]

  Duration
     T90: 23.4159999489784 +/- 2.03603537184411
        Measured from: -20.6119999885559
                   to: 2.80399996042252     [s; relative to TRIGTIME]
     T50: 7.96799993515015 +/- 5.35953766252271
        Measured from: -7.61599999666214
                   to: 0.351999938488007     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 1.50800001621246     
                   to: 2.50800001621246     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -22.027999997139     
                   to: 3.76399999856949     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.403004   0.500713   0.275939   0.073632
           0.027536   0.028631   0.024877   0.022261 [error]
 Peak      0.040904   0.049905   0.023627   0.009736
           0.005830   0.006019   0.005130   0.004427 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   25.792  -22.028    3.764
T90    23.416  -20.612    2.804
T50     7.968   -7.616    0.352
Peak    1.000    1.508    2.508
 
 
====== 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: 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      -1.777    -0.128      0.125       -           -               -         2.83e-03     -2.25e-04          2.22e-04      58.670   57
CPL     -0.984    -0.551      0.637       56.368      -9.860        31.299      7.76e-03     -3.86e-03          9.61e-03      52.300   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      -1.700     -0.244     0.235       -           -               -         6.82e-03     -1.15e-03          1.13e-03      53.670   57
CPL      0.058     -1.210     1.631       47.961      -9.046        21.933      7.27e-02     -7.27e-02          5.99e-01      46.840   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   1.21e-07  1.88e-07  2.19e-07  4.93e-07  6.72e-07  1.02e-06   erg/cm2
      90%_error_low -1.26e-08 -1.29e-08 -2.36e-08 -1.01e-07 -5.47e-08 -1.25e-07   erg/cm2
      90%_error_hi   1.29e-08  1.30e-08  2.38e-08  1.17e-07  5.54e-08  1.38e-07   erg/cm2
Peak flux       PL   3.40e-01  3.04e-01  1.87e-01  1.75e-01  9.05e-01  1.01e+00   ph/cm2/s
      90%_error_low -7.01e-02 -4.49e-02 -3.95e-02 -6.14e-02 -1.33e-01 -1.53e-01   ph/cm2/s
      90%_error_hi   7.26e-02  4.49e-02  4.01e-02  7.90e-02  1.33e-01  1.54e-01   ph/cm2/s
 
Fluence        CPL   1.10e-07  2.05e-07  2.16e-07  1.48e-07  6.19e-07  6.78e-07   erg/cm2
      90%_error_low -1.48e-08 -1.74e-08 -2.75e-08 -7.79e-08 -6.25e-08 -1.01e-07   erg/cm2
      90%_error_hi   1.49e-08  1.79e-08  2.67e-08  1.76e-07  6.49e-08  1.84e-07   erg/cm2
Peak flux      CPL   2.94e-01  3.74e-01  1.78e-01  2.43e-02  8.67e-01  8.70e-01   ph/cm2/s
      90%_error_low -8.12e-02 -6.50e-02 -5.59e-02 -2.43e-02 -1.33e-01 -1.35e-01   ph/cm2/s
      90%_error_hi   8.19e-02  6.81e-02  5.13e-02  6.35e-02  1.34e-01  1.40e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  186.0690    15.0997   0.0084    13.1348   156.6536         1.2848853     22.923 TRIG_00599037                 
 
Foreground time interval of the image:
-22.028   3.764 (delta_t =  25.792 [sec])
Background time interval of the image:
-155.403 -22.028 (delta_t = 133.375 [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  -22.028 sec. to    3.764 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.77665     ( -0.127965   0.125065 )
Norm@50keV  : 2.82813E-03    ( -0.000224836   0.000222297 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.67 using 59 PHA bins.
# Reduced chi-squared =          1.029 for     57 degrees of freedom 
# Null hypothesis probability =   4.141615e-01
 
Photon flux (15-150 keV)    in 25.79 sec: 0.386258 ( -0.026866  0.02688 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.72203e-07 ( -5.46831e-08  5.54446e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from  -22.028 sec. to    3.764 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.984097     ( -0.551004   0.636864 )
Epeak [keV] : 56.3679      ( -9.85982 31.2991 )
Norm@50keV  : 7.76229E-03    ( -0.00385682   0.00961304 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.30 using 59 PHA bins.
# Reduced chi-squared =         0.9340 for     56 degrees of freedom 
# Null hypothesis probability =   6.155372e-01
 
Photon flux (15-150 keV)    in 25.79 sec: 0.372129 ( -0.028466  0.028481 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.19058e-07 ( -6.25245e-08  6.49031e-08 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    1.508 sec. to    2.508 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.7     ( -0.243935   0.234713 )
Norm@50keV  : 6.81604E-03    ( -0.00114869   0.00113032 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.67 using 59 PHA bins.
# Reduced chi-squared =         0.9416 for     57 degrees of freedom 
# Null hypothesis probability =   6.008223e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.905282 ( -0.133454  0.133458 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.31233e-08 ( -1.09894e-08  1.12693e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    1.508 sec. to    2.508 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.0581257     ( -1.21437   1.62629 )
Epeak [keV] : 47.9612      ( -8.9992 21.9793 )
Norm@50keV  : 7.27353E-02    ( -0.0734184   0.597966 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          46.84 using 59 PHA bins.
# Reduced chi-squared =         0.8364 for     56 degrees of freedom 
# Null hypothesis probability =   8.034547e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.867214 ( -0.133324  0.134396 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.34995e-08 ( -1.04518e-08  1.20969e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 23.416 sec.
Hardness ratio (energy fluence ratio) = 1.05455680326

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

S(15-50 keV)  = 3.149231e-07
S(50-150 keV) = 3.0412773e-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 = -2.142427386856387E-01, IMY = -9.247330130020254E-02

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:
-155.403410 -22.028000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.5173  35.4423   14.2  52.6    9.4   0.3815   0.8    6.7	Her X-1                       
213.5018   0.9681    2.9  32.1   84.3   1.0852   4.0 ------	UNKNOWN                       
166.7393   1.5345    2.8  35.6  175.0   0.7051   4.1 ------	UNKNOWN                       
232.8713  63.4340    3.0  45.1  -31.1   0.9072   3.9 ------	UNKNOWN                       

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

Time interval of the image:
-22.028000 3.764000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4549  35.4086    6.9  52.5    9.4  -0.3560  -1.7    4.0	Her X-1                       
238.2295  11.6208    2.2  44.9   45.6   1.1807   5.2 ------	UNKNOWN                       
165.7587  -8.7840    2.4  44.1  165.9   0.5623   4.8 ------	UNKNOWN                       
186.0690  15.0997    0.5  13.1  156.7   1.2848  22.9 ------	UNKNOWN                       
249.1430  63.4925    2.4  51.5  -26.7   0.7883   4.8 ------	UNKNOWN                       
194.8342  73.0783    2.1  46.6  -54.2   1.6064   5.6 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
59.196600 782.430300
840.296000 962.332600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
176.5511 -35.9234    2.7  51.8  154.6  10.6463   4.3 ------	UNKNOWN                       
242.7278  44.5502    3.5  55.9   10.8  10.4078   3.3 ------	UNKNOWN                       
209.9228  43.6616    3.9  35.1   -4.5   1.9672   2.9 ------	UNKNOWN                       
170.6352  24.3033    2.4  17.2  -90.3   2.2587   4.8 ------	UNKNOWN                       
136.2377   1.5852    4.3  50.9 -135.6   7.9071   2.7 ------	UNKNOWN                       
140.9187  19.0845    2.6  43.2 -113.2  10.5663   4.4 ------	UNKNOWN