batgrbproduct analysis for trigger=687492

batgrbproduct Analysis for Trigger=687492

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 (local time): Tue Jun 21 08:57:24 EDT 2016
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger687492
======================================================================

  Trigger: 00687492      Segment: 000

  BAT Trigger Time: 485832856   [s; MET]
      Trigger Stop: 485832920   [s; MET]
               UTC: 2016-05-25T01:33:59.682820    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 103.530165020782   Dec: -0.17351014677238  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.19
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    7.19

  Flight Position:   [ source = BAT ]
    RA: 103.530165020782   Dec: -0.17351014677238  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 103.53   Dec: -0.173509  [deg; J2000]
        { 06h 54m 07.2s , 00d -10' -24.6" }
        +/- 2.9214566106 [arcmin] (estimated 90% radius based on SNR)
    SNR: 6.57708023186
 
 
  Angular difference between Flight and Ground position is 0.009901 arcmin
 
  Partial Coding Fraction: 0.984375    [ including projection effects ]

  Duration
     T90: N/A +/- N/A 
        Measured from: N/A
                   to: N/A     [s; relative to TRIGTIME]
     T50: N/A +/- N/A
        Measured from: N/A
                   to: N/A     [s; relative to TRIGTIME]

    WARNING: battblocks failed.  Used TDRSS fore/background intervals

======================================================================
 
=== 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   Power-law 6.78e-08 6.37e-08 4.15e-08 4.18e-08 1.90e-07 2.14e-07   erg/cm2
              Error 1.83e-08 2.10e-08 2.59e-08 4.87e-08 6.63e-08 9.48e-08   erg/cm2
Peak flux Power-law -------- -------- -------- -------- -------- --------   ph/cm2/s
              Error -------- -------- -------- -------- -------- --------   ph/cm2/s
 
Fluence   Cutoff-PL 6.91e-08 8.45e-08 1.30e-08 7.49e-11 1.66e-07 1.67e-07   erg/cm2
              Error 2.09e-08 3.10e-08 2.13e-08 -------- 4.87e-08 4.88e-08   erg/cm2
Peak flux Cutoff-PL -------- -------- -------- -------- -------- --------   ph/cm2/s
              Error -------- -------- -------- -------- -------- --------   ph/cm2/s
 
Fluence        Band -------- -------- -------- -------- -------- --------   erg/cm2
              Error -------- -------- -------- -------- -------- --------   erg/cm2
Peak flux      Band -------- -------- -------- -------- -------- --------   ph/cm2/s
              Error -------- -------- -------- -------- -------- --------   ph/cm2/s

 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    2.622    0.548    -      -           2.86e-04 1.36e-04   43.520 57
CPL  -0.928    4.404      25.3    7.3      8.18e-02 2.15e+03   38.010 56
 
 
(1-s peak spectrum is not available)
 
Model      : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index   : photon index: E^-{Ph_index} (minus sign is not included in the 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 PL model and at 1 keV in CPL model
Nomr_90err : 90% error of the normalization
chi2       : Chi-Squared
dof        : degree of freedom

 
=== T90/T50 calculation in the 50-300 keV band (BATSE band) using 64 ms lc ===
 
T90 in the 50-300 keV band: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100     N/A      N/A      N/A
T90      N/A      N/A      N/A
T50      N/A      N/A      N/A
Peak     N/A      N/A      N/A

Click here for the BAT GCN circular template

Special notes of this burst

Image

Pre-slew 15.0-50.0 keV image (Event data)

#   RAcent    DECcent   POSerr    Theta     Phi     Peak Cts  SNR   Name
    103.530   -0.174    0.000     10.915    -67.355 0.467     6.577 TRIG_00687492
 
Image time interval: 0.000 to 64.000 [sec]

Lightcurves

Notes:

1) The mask-weighted light curves are using the flight position.
2) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
3) For all the mask-weighted lightcurves, the y-axis units are counts/sec/det where a det is 0.4 x 0.4 = 0.16 sq cm.
4) The verticle lines correspond to following: green dotted lines are T50 interval, black dotted lines are T90 interval, blue solid line(s) is a spacecraft slew start time, and orange solid line(s) is a spacecraft slew end time.
5) Time of each bin is in the middle of the bin.

1 s binning

From T0-310 s to T0+310 s

From T100_start - 20 s to T100_end + 30 s

Full time interval

64 ms binning

Full time interval

From T100_start to T100_end

From T0-5 sec to T0+5 sec

16 ms binning

From T100_start-5 s to T100_start+5 s

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000

8 ms binning

From T100_start-3 s to T100_start+3 s

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000

2 ms binning

From T100_start-1 s to T100_start+1 s

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000

SN=5 or 10 sec. binning (whichever binning is satisfied first)

SN=5 or 10 sec. binning (T < 200 sec)

Quad-rate summed light curves (from T0-300s to T0+1000s)

Spectral Evolution

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   64.000 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.62222     ( -0.484026   0.611867 )
Norm@50keV  : 2.86203E-04    ( -0.000130032   0.000141841 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          43.52 using 59 PHA bins.
# Reduced chi-squared =         0.7635 for     57 degrees of freedom 
# Null hypothesis probability =   9.056671e-01
 
Photon flux (15-150 keV)    in 64 sec: 6.07461E-02 ( -0.0157518  0.0159294 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.90187e-07 ( -6.21102e-08  7.03923e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    0.000 sec. to   64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.928429     ( -6.19111   2.61613 )
Epeak [keV] : 25.2953      ( -7.69657 6.9705 )
Norm@50keV  : 8.17607E-02    ( -0.0967295   4302.33 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          38.01 using 59 PHA bins.
# Reduced chi-squared =         0.6787 for     56 degrees of freedom 
# Null hypothesis probability =   9.686522e-01
 
Photon flux (15-150 keV)    in 64 sec: 6.16879E-02 ( -0.0147758  0.0149049 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.66652e-07 ( -4.61784e-08  5.12749e-08 ) ergs/cm2

Band function

Time interval is from    0.000 sec. to   64.000 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 0.882593   ( -1.89392   -0.917563 )
beta        : -9.37167    ( 9.37167   19.3654 )
Epeak [keV] : 25.3744      ( -10.6317 6.84644 )
Norm@50keV   : 7.49384E-02    ( -0.0915783   23.9704 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          38.02 using 59 PHA bins.
# Reduced chi-squared =         0.6913 for     55 degrees of freedom 
# Null hypothesis probability =   9.606539e-01
 
Photon flux (15-150 keV)    in 64 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

Single BB

 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    : 6.64363  (-1.42852  1.68039)
R^2/D10^2   : 0.160690  (-0.0978048   0.276328)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          38.00 using 59 PHA bins.
# Reduced chi-squared =         0.6666 for     57 degrees of freedom 
# Null hypothesis probability =   9.752252e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  6.884e-08   3.629e-08
25- 50  8.502e-08   5.021e-08
50-150  1.162e-08   9.726e-09
15-150  1.655e-07   9.385e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 24.7563       (-9.57215      17.7985)
Norm        : 0.608865       (-0.238218     0.433972)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          40.12 using 59 PHA bins.
# Reduced chi-squared =         0.7039 for     57 degrees of freedom 
# Null hypothesis probability =   9.560614e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  7.091e-08   3.084e-08
25- 50  7.222e-08   3.887e-08
50-150  3.027e-08   2.519e-08
15-150  1.734e-07   8.673e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 4.81931        (-4.75328      -4.75328)
R1^2/D10^2  : 0.169667        (-0.167141      -0.167141)
kT2 [keV]   : 7.36489        (-7.26045      188.858)
R2^2/D10^2  : 7.96658E-02    (-0.0914005   -0.0914005)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          37.95 using 59 PHA bins.
# Reduced chi-squared =         0.6900 for     55 degrees of freedom 
# Null hypothesis probability =   9.613743e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  6.943e-08   2.176e-06
25- 50  8.397e-08   1.468e-05
50-150  1.444e-08   7.235e-05
15-150  1.678e-07   1.229e-04

Pre-slew spectrum (Pre-slew PHA with pre-slew DRM)

Power-law model

 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.62222     ( -0.484026   0.611867 )
Norm@50keV  : 2.86203E-04    ( -0.000130032   0.000141841 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          43.52 using 59 PHA bins.
# Reduced chi-squared =         0.7635 for     57 degrees of freedom 
# Null hypothesis probability =   9.056671e-01
 
Photon flux (15-150 keV)    in 64 sec: 6.07358E-02 ( -0.0157558  0.0159233 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.90227e-07 ( -6.2071e-08  7.04819e-08 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.898569     ( -6.23044   2.59206 )
Epeak [keV] : 25.2626      (   )
Norm@50keV  : 7.79086E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          38.01 using 59 PHA bins.
# Reduced chi-squared =         0.6787 for     56 degrees of freedom 
# Null hypothesis probability =   9.686711e-01
 
Photon flux (15-150 keV)    in 64 sec: 6.16783E-02 ( -0.0147967  0.0149007 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.66718e-07 ( -4.62259e-08  5.12813e-08 ) ergs/cm2

Band function

 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 0.882593   ( -1.89392   -0.917563 )
beta        : -9.37167    ( 9.37167   19.3654 )
Epeak [keV] : 25.3744      ( -10.5961 6.84634 )
Norm@50keV   : 7.49384E-02    ( -0.0915783   23.9704 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          38.02 using 59 PHA bins.
# Reduced chi-squared =         0.6913 for     55 degrees of freedom 
# Null hypothesis probability =   9.606539e-01
 
Photon flux (15-150 keV)    in 64 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

S(25-50 keV) vs. S(50-100 keV) plot

S(25-50 keV)  = 6.37e-08
S(50-100 keV) = 4.15e-08

T90 vs. Hardness ratio plot

T90                                   = N/A sec.
Hardness ratio (energy fluence ratio) = 0.651491

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 
Count Ratio (50-100 keV) / (15-25 keV) =

Mask shadow pattern

IMX = 0.0742453777469, IMY = 0.177968965962

TIME vs. PHA plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000

TIME vs. DetID plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000

100 us light curve (15-350 keV)

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000

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:

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

Time interval of the image:
0.000000 64.000000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6407  22.0348    1.2  40.3  -62.7   2.4801  10.0    1.3	Crab                          
135.4750 -40.6705    8.6  39.3  130.0   0.3535   1.3    7.4	Vela X-1                      
114.0644 -36.2211    2.2  28.6  154.7   0.6242   5.2 ------	UNKNOWN                       
103.5733  -0.1943    2.1  10.9  -67.3   0.5092   5.5 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
324.300590 585.300600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.4528 -40.5485    4.6  30.3 -108.8   0.9810   2.5    3.5	Vela X-1                      
170.3156 -60.5916    3.7  23.0 -175.5   0.7760   3.1    1.9	Cen X-3                       
186.5701 -62.7820    1.0  26.1  166.7   3.4020  12.1    2.5	GX 301-2

Plot creation:
Tue Jun 21 18:25:02 EDT 2016