batgrbproduct analysis for trigger=852903

batgrbproduct Analysis for Trigger=852903

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): Fri Oct 19 18:44:01 EDT 2018
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger852903
======================================================================

  Trigger: 00852903      Segment: 000

  BAT Trigger Time: 555754971.648   [s; MET]
      Trigger Stop: 555754973.696   [s; MET]
               UTC: 2018-08-12T08:22:30.233000    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 245.885624105366   Dec: 74.6697837972354  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.57
     Image Trigger?:     NO
     Rate S/N Ratio:     11.2249721603218  [ if not an image trigger ]
     Image S/N Ratio:    7.57

  Flight Position:   [ source = BAT ]
    RA: 245.885624105366   Dec: 74.6697837972354  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 245.831368581864   Dec: 74.6685742511222  [deg; J2000]  
        { 16h 23m 19.5s , +74d 40' 06.9" }
         +/- 2.26589837941564 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.3777879542677 [arcmin] (formal 1-sigma fit error)
    SNR: 9.45435821307488
 
  Angular difference between Flight and Ground position is 0.863737 arcmin
 
  Partial Coding Fraction: 0.2617188    [ including projection effects ]

  Duration
     T90: 16.527999997139 +/- 0.970154591757242
        Measured from: -0.0880000591278076
                   to: 16.4399999380112     [s; relative to TRIGTIME]
     T50: 13.663999915123 +/- 6.0850797955308
        Measured from: 1.24000000953674
                   to: 14.9039999246597     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 15.62399995327     
                   to: 16.62399995327     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.840000033378601     
                   to: 16.6280000209808     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.178123   0.429186   0.324501   0.109422
           0.057951   0.061071   0.055662   0.052230 [error]
 Peak      0.046360   0.093747   0.056042   0.032646
           0.015625   0.016160   0.015621   0.012653 [error]

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

======================================================================
 
=== 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 8.02e-08 1.73e-07 2.93e-07 1.14e-06 8.05e-07 1.69e-06   erg/cm2
              Error 2.38e-08 3.12e-08 5.37e-08 4.69e-07 1.36e-07 5.01e-07   erg/cm2
Peak flux Power-law 5.22e-01 5.91e-01 4.79e-01 6.47e-01 1.83e+00 2.24e+00   ph/cm2/s
              Error 2.03e-01 1.46e-01 1.20e-01 3.31e-01 4.09e-01 4.99e-01   ph/cm2/s
 
Fluence   Cutoff-PL 6.88e-08 1.85e-07 3.11e-07 4.42e-07 7.65e-07 1.00e-06   erg/cm2
              Error 2.99e-08 3.84e-08 6.30e-08 5.87e-07 1.58e-07 7.52e-07   erg/cm2
Peak flux Cutoff-PL 4.50e-01 6.43e-01 5.15e-01 2.74e-01 1.78e+00 1.88e+00   ph/cm2/s
              Error 2.41e-01 1.88e-01 1.44e-01 3.86e-01 4.25e-01 5.91e-01   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    1.237    0.271    -      -           4.59e-03 7.17e-04   58.920 57
CPL   0.489    1.344     106.9    0.0      1.05e-02 0.00e+00   57.910 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.303    0.358    -      -           1.53e-02 3.32e-03   61.520 57
CPL   0.453    2.297      91.7    0.0      4.12e-02 0.00e+00   60.750 56
 
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: 7.552000 sec.
T50 in the 50-300 keV band: 4.928000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   17.468   -0.840   16.628
T90    16.528   -0.088   16.440
T50    13.664    1.240   14.904
Peak    1.000   15.624   16.624

Click here for the BAT GCN circular template

Estimated redshift from machine learning (Ukwatta et al. 2016) - may take a few minute to calcaulte

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  245.8314    74.6686   0.0203    38.3541   139.0684         1.1376932      9.454 TRIG_00852903                 
 
Foreground time interval of the image:
 -0.840  16.628 (delta_t =  17.468 [sec])
Background time interval of the image:
-385.547 -370.517 (delta_t =  15.030 [sec])
-239.648  -0.840 (delta_t = 238.808 [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 2.048000

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 2.048000

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 2.048000

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   -0.840 sec. to   16.628 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.23740     ( -0.274365   0.266943 )
Norm@50keV  : 4.59390E-03    ( -0.000716943   0.000716577 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.92 using 59 PHA bins.
# Reduced chi-squared =          1.034 for     57 degrees of freedom 
# Null hypothesis probability =   4.052475e-01
 
Photon flux (15-150 keV)    in 17.47 sec: 0.542244 ( -0.088106  0.08853 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.05977e-07 ( -1.35841e-07  1.37069e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.840 sec. to   16.628 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.488558     ( -1.73688   0.950681 )
Epeak [keV] : 106.886      (   )
Norm@50keV  : 1.04840E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.91 using 59 PHA bins.
# Reduced chi-squared =          1.034 for     56 degrees of freedom 
# Null hypothesis probability =   4.048106e-01
 
Photon flux (15-150 keV)    in 17.47 sec: 0.524325 ( -0.095157  0.093825 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.65866e-07 ( -1.62608e-07  1.53743e-07 ) ergs/cm2

Band function

Time interval is from   -0.840 sec. to   16.628 sec.
 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       :    (     )
beta        :     (     )
Epeak [keV] :       (   )
Norm@50keV   :     (     )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in  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]    : 17.4347  (-2.9071  3.8372)
R^2/D10^2   : 3.95190E-02  (-0.0195036   0.0345186)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.22 using 59 PHA bins.
# Reduced chi-squared =          1.074 for     57 degrees of freedom 
# Null hypothesis probability =   3.271517e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.243e-08   1.397e-08
25- 50  1.915e-07   4.994e-08
50-150  4.189e-07   1.350e-07
15-150  6.529e-07   1.436e-07

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (-56.7721      -200)
Norm        : 2.27244       (-0.359672     0.359672)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          62.13 using 59 PHA bins.
# Reduced chi-squared =          1.090 for     57 degrees of freedom 
# Null hypothesis probability =   2.985079e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  9.886e-08   5.720e-08
25- 50  1.902e-07   1.081e-07
50-150  4.171e-07   2.366e-07
15-150  7.061e-07   4.007e-07

Double BB

------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 1.17746        (-0.984196      2.50123)
R1^2/D10^2  : 3.08687E+04        (-26145.4      -26146.2)
kT2 [keV]   : 18.0912        (-3.10623      6.12059)
R2^2/D10^2  : 3.43340E-02    (-0.0177169   0.0285639)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.40 using 59 PHA bins.
#Fit statistic : Chi-Squared =          58.22 using 59 PHA bins.
# Reduced chi-squared =          1.062 for     55 degrees of freedom 
# Reduced chi-squared =          1.058 for     55 degrees of freedom 
# Null hypothesis probability =   3.516346e-01
# Null hypothesis probability =   3.578210e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  6.272e-08   2.510e-08
25- 50  1.781e-07   5.885e-08
50-150  4.404e-07   1.411e-07
15-150  6.812e-07   1.814e-07

Peak spectrum fit

Power-law model

Time interval is from   15.624 sec. to   16.624 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.30317     ( -0.361335   0.354886 )
Norm@50keV  : 1.53239E-02    ( -0.00332504   0.00331969 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.52 using 59 PHA bins.
# Reduced chi-squared =          1.079 for     57 degrees of freedom 
# Null hypothesis probability =   3.174539e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.82928 ( -0.40795  0.4097 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.51328e-07 ( -3.54556e-08  3.5835e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   15.624 sec. to   16.624 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.452763     ( -2.72939   1.86473 )
Epeak [keV] : 91.7016      (   )
Norm@50keV  : 4.11930E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.75 using 59 PHA bins.
# Reduced chi-squared =          1.085 for     56 degrees of freedom 
# Null hypothesis probability =   3.088556e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.78114 ( -0.42816  0.42162 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.42699e-07 ( -4.30025e-08  3.99806e-08 ) ergs/cm2

Band function

Time interval is from   15.624 sec. to   16.624 sec.
 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       :    (     )
beta        :     (     )
Epeak [keV] :       (   )
Norm@50keV   :     (     )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in  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]    : 15.5289  (-3.43068  4.95154)
R^2/D10^2   : 0.198254  (-0.122548   0.272025)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          62.55 using 59 PHA bins.
# Reduced chi-squared =          1.097 for     57 degrees of freedom 
# Null hypothesis probability =   2.857125e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  9.947e-09   3.991e-09
25- 50  4.078e-08   1.655e-08
50-150  6.793e-08   3.498e-08
15-150  1.187e-07   4.435e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 199.363       (-89.392      -199.363)
Norm        : 7.64496       (-1.66739     1.66744)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          62.37 using 59 PHA bins.
# Reduced chi-squared =          1.094 for     57 degrees of freedom 
# Null hypothesis probability =   2.910189e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.904e-08   1.136e-08
25- 50  3.662e-08   2.103e-08
50-150  8.031e-08   4.626e-08
15-150  1.360e-07   7.790e-08

Double BB

R1^2/D10^2  : 0.380092        (-0.2175      0.752431)
kT2 [keV]   : 195.180        (-195.406      -195.406)
R2^2/D10^2  : 2.08869E-04    (-0.000163929   0.0511752)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.47 using 59 PHA bins.
#Fit statistic : Chi-Squared =          58.33 using 59 PHA bins.
#Fit statistic : Chi-Squared =          58.31 using 59 PHA bins.
# Reduced chi-squared =          1.063 for     55 degrees of freedom 
# Reduced chi-squared =          1.061 for     55 degrees of freedom 
# Reduced chi-squared =          1.060 for     55 degrees of freedom 
# Null hypothesis probability =   3.490720e-01
# Null hypothesis probability =   3.538470e-01
# Null hypothesis probability =   3.547459e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.265e-08   7.860e-09
25- 50  4.146e-08   2.461e-08
50-150  9.170e-08   4.141e-08
15-150  1.458e-07   7.595e-08

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: 1.23740     ( -0.274365   0.266943 )
Norm@50keV  : 4.59390E-03    ( -0.000716943   0.000716577 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.92 using 59 PHA bins.
# Reduced chi-squared =          1.034 for     57 degrees of freedom 
# Null hypothesis probability =   4.052475e-01
 
Photon flux (15-150 keV)    in 17.47 sec: 0.542228 ( -0.0880903  0.088537 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.05888e-07 ( -1.35817e-07  1.37121e-07 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.487016     ( -1.73633   0.951226 )
Epeak [keV] : 106.766      (   )
Norm@50keV  : 1.05026E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.91 using 59 PHA bins.
# Reduced chi-squared =          1.034 for     56 degrees of freedom 
# Null hypothesis probability =   4.048106e-01
 
Photon flux (15-150 keV)    in 17.47 sec: 0.524295 ( -0.095143  0.0938 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.66178e-07 ( -1.58219e-07  1.53998e-07 ) ergs/cm2

Band function

 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       :    (     )
beta        :     (     )
Epeak [keV] :       (   )
Norm@50keV   :     (     )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in  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)  = 1.73e-07
S(50-100 keV) = 2.93e-07

T90 vs. Hardness ratio plot

T90                                   = 16.527999997139 sec.
Hardness ratio (energy fluence ratio) = 1.69364

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 2.40949
Count Ratio (50-100 keV) / (15-25 keV) = 1.82178

Mask shadow pattern

IMX = -5.978117210152792E-01, IMY = -5.184177835825062E-01

TIME vs. PHA plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000

TIME vs. DetID plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000

100 us light curve (15-350 keV)

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000

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:
-385.547400 -370.517300
-239.648000 -0.840000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6198  22.0068    0.7  49.5   -4.9   8.8035  16.8    0.9	Crab                          
 55.4600  55.2352    2.6  36.6   51.3   2.3061   4.5 ------	UNKNOWN                       
 68.0536  55.3668    2.6  30.8   43.6   1.6308   4.5 ------	UNKNOWN                       
159.3095  66.6462    2.5  14.8  171.5   1.2075   4.5 ------	UNKNOWN                       
149.7931  26.1358    3.3  38.0  -96.2   2.8526   3.5 ------	UNKNOWN

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

Time interval of the image:
-0.840000 16.628000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6998  22.1039    5.9  49.4   -4.9   0.2327   1.9    6.5	Crab                          
245.8311  74.6684    1.2  38.4  139.1   1.1376   9.5 ------	UNKNOWN                       
 62.5285  86.2286    3.1  27.5  109.6   0.3219   3.7 ------	UNKNOWN                       
194.3503  27.0203    2.1  55.4 -146.7   1.5827   5.6 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
91.252600 962.386300
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.3529  35.3025    4.6  39.6  152.1   3.2267   2.5    5.7	Her X-1                       
 30.8847  67.0368    2.9  36.5    5.0   3.3059   4.0 ------	UNKNOWN                       
246.4685  88.2131    3.4  13.5  -17.0   2.0651   3.4 ------	UNKNOWN                       
 65.2841  54.4366    2.8  50.9  -16.6   5.9206   4.2 ------	UNKNOWN                       
183.4829  67.4682    3.0  20.3  -94.9   2.7727   3.8 ------	UNKNOWN                       
206.0231  21.8688    3.5  56.8 -151.8  15.5593   3.3 ------	UNKNOWN

Plot creation:
Fri Oct 26 12:39:38 EDT 2018