GRB130518B

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 GROUND-DETECTED GRB DATA PROCESSING REPORT                 
    Process Script: hand-made scripts that follow steps in batgrbproduct
                    but without using TDRSS info
    Process Start Time: Mon Sep 29 23:57:38 EDT 2014
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/ground_detect_bursts/scripts
==========================================================================
 
  BAT Trigger Time: 390567049.6
               UTC: 2013-05-18T10:50:39.031   [includes UTCF correction]
       Where From?: Ground analysis (best_duration.txt)
  NOTE: BAT trigger time for ground-detected burst is the T100 start time.
 
  Refined Position:   [ source = BAT mosaic image ]
    RA: 321.545325342   Dec: -20.1460132374  [deg; J2000]
        { 21h 26m 10.9s , -20d -8' -45.6" }
        +/- 1.81773090512 [arcmin] (estimated 90% radius based on SNR)
    SNR: 12.9544398507
 
 
  Angular difference between the analysis and refined position is Usage: arcmin
 
  Partial Coding Fraction: 1.914062e-01    [ including projection effects ]
 
  Duration
     T90: 8. +/- 1.6
        Measured from: 0
                   to: 8     [s; relative to TRIGTIME]
     T50: 4.80000001192093 +/- 1.6
        Measured from: 1.6
                   to: 6.4     [s; relative to TRIGTIME]
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    8.000    0.000    8.000
T90     8.000    0.000    8.000
T50     4.800    1.600    6.400
Peak    1.000    0.300    1.300
 
 
====== 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      -1.458    -0.241      0.242       -           -               -         9.61e-03     -1.37e-03          1.37e-03      55.280   57
CPL     -0.791    -0.829      1.229       96.624     -34.202       -96.624      2.00e-02     -1.13e-02          5.41e-02      53.930   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      -1.606     -0.451     0.417       -           -               -         1.11e-02     -3.59e-03          3.54e-03      71.030   57
CPL      1.849     -2.173     4.018       55.839     -12.251        16.330      5.93e-01     -5.93e-01          3.87e+01      62.500   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   7.64e-08  1.44e-07  2.10e-07  6.51e-07  5.95e-07  1.08e-06   erg/cm2
      90%_error_low -1.89e-08 -2.29e-08 -3.64e-08 -2.13e-07 -8.99e-08 -2.44e-07   erg/cm2
      90%_error_hi   2.03e-08  2.26e-08  3.59e-08  2.72e-07  9.04e-08  2.90e-07   erg/cm2
Peak flux       PL   5.09e-01  4.79e-01  3.13e-01  3.16e-01  1.43e+00  1.62e+00   ph/cm2/s
      90%_error_low -2.19e-01 -1.57e-01 -1.15e-01 -1.73e-01 -4.51e-01 -5.10e-01   ph/cm2/s
      90%_error_hi   2.48e-01  1.57e-01  1.17e-01  2.51e-01  4.62e-01  5.10e-01   ph/cm2/s
 
Fluence        CPL   6.67e-08  1.53e-07  2.23e-07  2.91e-07  5.75e-07  7.33e-07   erg/cm2
      90%_error_low -2.31e-08 -2.65e-08 -4.15e-08 -1.91e-07 -9.63e-08 -2.15e-07   erg/cm2
      90%_error_hi   2.45e-08  2.77e-08  4.30e-08  4.43e-07  9.55e-08  4.40e-07   erg/cm2
Peak flux      CPL   2.68e-01  6.43e-01  4.16e-01  3.98e-02  1.35e+00  1.38e+00   ph/cm2/s
      90%_error_low -2.68e-01 -2.19e-01     N/A   -3.98e-02 -4.13e-01 -4.40e-01   ph/cm2/s
      90%_error_hi   2.67e-01  2.20e-01     N/A    1.07e-01  4.59e-01  4.40e-01   ph/cm2/s
 
======================================================================

Special notes of this burst

Image

15.0-350.0 keV image (Event data)

#RAcent DECcent POSerr Theta  Phi  Peak_Cts  SNR Name
321.545 -20.146 0.015 47.970 12.723 1.339 12.954 TRIG_556105
 
Image time interval: -3.600 to 6.479 [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.

Best duration plot

Full-time range; 1 s binning

Bokeh Plot

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    0.000 sec. to    6.479 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.45797     ( -0.240963   0.241748 )
Norm@50keV  : 9.61085E-03    ( -0.00137126   0.00136929 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.28 using 59 PHA bins.
# Reduced chi-squared =         0.9699 for     57 degrees of freedom 
# Null hypothesis probability =   5.396809e-01
 
Photon flux (15-150 keV)    in 6.479 sec: 1.18679 ( -0.1787  0.17974 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.9507e-07 ( -8.98644e-08  9.0384e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    0.000 sec. to    6.479 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.791315     ( -0.828675   1.22857 )
Epeak [keV] : 96.6240      ( -34.2025 -96.6244 )
Norm@50keV  : 2.00395E-02    ( -0.0113429   0.0541494 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.93 using 59 PHA bins.
# Reduced chi-squared =         0.9631 for     56 degrees of freedom 
# Null hypothesis probability =   5.534956e-01
 
Photon flux (15-150 keV)    in 6.479 sec: 1.15230 ( -0.186245  0.18673 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.75477e-07 ( -9.6265e-08  9.55316e-08 ) ergs/cm2

1-s peak spectrum fit

Power-law model

Time interval is from    0.300 sec. to    1.300 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.60633     ( -0.43931   0.428915 )
Norm@50keV  : 1.10960E-02    ( -0.00357739   0.00354772 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          71.03 using 59 PHA bins.
# Reduced chi-squared =          1.246 for     57 degrees of freedom 
# Null hypothesis probability =   1.000946e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.43013 ( -0.450748  0.46236 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.03493e-07 ( -3.41568e-08  3.48668e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    0.300 sec. to    1.300 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.84855     ( -2.21592   3.97478 )
Epeak [keV] : 55.8390      ( -11.9835 16.5978 )
Norm@50keV  : 0.592651    ( -0.665222   38.6081 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          62.50 using 59 PHA bins.
# Reduced chi-squared =          1.116 for     56 degrees of freedom 
# Null hypothesis probability =   2.563984e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.35004 ( -0.413365  0.4588 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.67721e-08 ( -2.92634e-08  3.36737e-08 ) ergs/cm2

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 8.0 sec.
Hardness ratio (energy fluence ratio) = 1.45606270977

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

S(15-50 keV)  = 2.205574e-07
S(50-150 keV) = 3.745236e-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 = 1.08218922434, IMY = -0.244342599598

Spacecraft aspect plot

Bright source in the event data image

Event data image of 15-350 keV band

Time interval of the image:
-3.600000 6.478700
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4743  35.3779    5.7  45.8  146.4   0.2669   2.0    2.3	Her X-1                       
288.7715  10.9129    3.2  22.8   83.9   0.1883   3.6    2.5	GRS 1915+105                  
299.6330  35.4088    0.0  11.6  179.1   0.0724   1.9   12.6	Cyg X-1                       
308.0935  40.9040    5.3  15.2 -146.3   0.0798   2.2    3.0	Cyg X-3                       
326.2350  38.4784   51.7  20.5 -102.0   0.0095   0.2    9.9	Cyg X-2                       
307.8453 -17.5655    2.1  43.3   30.1   0.5104   5.7 ------	UNKNOWN                       
321.5453 -20.1460    0.9  48.0   12.7   1.3396  12.9 ------	UNKNOWN                       
339.3711 -17.8965    2.6  53.7   -8.0   0.5242   4.5 ------	UNKNOWN                       
352.4357  47.3363    2.2  41.5 -102.4   0.7874   5.1 ------	UNKNOWN

Webpage updated on:
Sun Jun 21 01:07:01 EDT 2015

Analysis Summary

Notes:

Image

15.0-350.0 keV image (Event data)

Light Curves

Best duration plot

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:

Time averaged spectrum fit using the average DRM

Power-law model

Cutoff power-law model

1-s peak spectrum fit

Power-law model

Cutoff power-law model

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

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

Mask shadow pattern

Spacecraft aspect plot

Bright source in the event data image

Event data image of 15-350 keV band

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