batgrbproduct analysis for trigger=846088

batgrbproduct Analysis for Trigger=846088

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): Mon Aug  6 18:41:55 EDT 2018
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger846088
======================================================================

  Trigger: 00846088      Segment: 000

  BAT Trigger Time: 552375424.064   [s; MET]
      Trigger Stop: 552375425.088   [s; MET]
               UTC: 2018-07-04T05:36:42.855940    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 32.6378994196206   Dec: 69.9477861437904  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.74
     Image Trigger?:     NO
     Rate S/N Ratio:     34.8711915483254  [ if not an image trigger ]
     Image S/N Ratio:    7.74

  Flight Position:   [ source = BAT ]
    RA: 32.6378994196206   Dec: 69.9477861437904  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 32.6044440870851   Dec: 69.9653443591817  [deg; J2000]  
        { 02h 10m 25.1s , +69d 57' 55.2" }
         +/- 1.32640477295966 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.446230097852468 [arcmin] (formal 1-sigma fit error)
    SNR: 20.3173397436301
 
  Angular difference between Flight and Ground position is 1.258235 arcmin
 
  Partial Coding Fraction: 0.07421875    [ including projection effects ]

  Duration
     T90: 19.6560000181198 +/- 1.40470642375823
        Measured from: -17.1360000371933
                   to: 2.51999998092651     [s; relative to TRIGTIME]
     T50: 14.5839999914169 +/- 0.815580766685976
        Measured from: -14.1759999990463
                   to: 0.407999992370605     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.0440000295639038     
                   to: 1.0440000295639     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -17.8960000276566     
                   to: 4.23599994182587     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.272130   2.399375   2.915270   1.373437
           0.132981   0.151889   0.147129   0.121904 [error]
 Peak      0.125741   0.340966   0.460087   0.155557
           0.031556   0.039442   0.044610   0.036333 [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 6.02e-07 1.31e-06 2.24e-06 8.87e-06 6.15e-06 1.30e-05   erg/cm2
              Error 7.44e-08 9.81e-08 1.41e-07 1.25e-06 3.67e-07 1.31e-06   erg/cm2
Peak flux Power-law 3.12e-04 3.82e-03 8.81e-03 4.13e+00 3.36e-02 4.13e+00   ph/cm2/s
              Error 1.61e-04 1.75e-03 -------- 1.07e+00 -------- 1.10e+00   ph/cm2/s
 
Fluence   Cutoff-PL 5.44e-07 1.33e-06 2.35e-06 6.04e-06 6.11e-06 1.03e-05   erg/cm2
              Error 9.80e-08 1.05e-07 1.88e-07 2.65e-06 3.74e-07 2.65e-06   erg/cm2
Peak flux Cutoff-PL 1.45e+00 3.05e+00 3.37e+00 1.93e+00 9.14e+00 9.80e+00   ph/cm2/s
              Error 6.52e-01 4.98e-01 5.14e-01 1.02e+00 1.19e+00 1.58e+00   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    1.224    0.101    -      -           2.76e-02 1.66e-03   76.370 57
CPL   0.868    0.425     194.1  -59.1      3.90e-02 1.64e-02   74.260 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.108    0.182    -      -           8.24e-02 9.69e-03   68.970 57
CPL  -0.379    1.068     100.6   41.7      3.31e-01 4.01e-01   60.760 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: 21.632000 sec.
T50 in the 50-300 keV band: 15.552000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   22.132  -17.896    4.236
T90    19.656  -17.136    2.520
T50    14.584  -14.176    0.408
Peak    1.000    0.044    1.044

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
   32.6044    69.9653   0.0095    57.6762   -18.1255         8.3681991     20.317 TRIG_00846088                 
 
Foreground time interval of the image:
-17.896   4.236 (delta_t =  22.132 [sec])
Background time interval of the image:
-239.064 -17.896 (delta_t = 221.168 [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 1.024000

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 1.024000

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 1.024000

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  -17.896 sec. to    4.236 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.22440     ( -0.101665   0.100306 )
Norm@50keV  : 2.75889E-02    ( -0.00166649   0.0016605 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          76.37 using 59 PHA bins.
# Reduced chi-squared =          1.340 for     57 degrees of freedom 
# Null hypothesis probability =   4.431561e-02
 
Photon flux (15-150 keV)    in 22.13 sec: 3.24996 ( -0.21322  0.21421 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.15307e-06 ( -3.6703e-07  3.67438e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from  -17.896 sec. to    4.236 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.868278     ( -0.459336   0.390702 )
Epeak [keV] : 194.054      ( -75.8682 -194.054 )
Norm@50keV  : 3.89801E-02    ( -0.0120026   0.0208127 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          74.26 using 59 PHA bins.
# Reduced chi-squared =          1.326 for     56 degrees of freedom 
# Null hypothesis probability =   5.166416e-02
 
Photon flux (15-150 keV)    in 22.13 sec: 3.19388 ( -0.22201  0.22327 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.11226e-06 ( -3.73986e-07  3.73059e-07 ) ergs/cm2

Band function

Time interval is from  -17.896 sec. to    4.236 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]    : 21.3181  (  )
R^2/D10^2   : 0.122660  (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =         118.19 using 59 PHA bins.
# Reduced chi-squared =         2.0735 for     57 degrees of freedom 
# Null hypothesis probability =   3.593947e-06
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.315e-07   3.034e-08
25- 50  1.201e-06   1.024e-07
50-150  4.074e-06   3.331e-07
15-150  5.507e-06   4.127e-07

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (-9.38164      -200)
Norm        : 14.1241       (-0.843424     0.843424)
------------------------------------------------------------
#Fit statistic : Chi-Squared =         110.79 using 59 PHA bins.
# Reduced chi-squared =         1.9436 for     57 degrees of freedom 
# Null hypothesis probability =   2.594498e-05
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  7.787e-07   5.765e-08
25- 50  1.498e-06   1.095e-07
50-150  3.285e-06   2.512e-07
15-150  5.561e-06   4.802e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 6.86324        (-1.86684      3.48736)
R1^2/D10^2  : 2.63492        (-1.9119      6.29464)
kT2 [keV]   : 28.1646        (-3.75239      9.14022)
R2^2/D10^2  : 4.25686E-02    (-0.0272931   0.0289525)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          77.14 using 59 PHA bins.
# Reduced chi-squared =          1.403 for     55 degrees of freedom 
# Null hypothesis probability =   2.607160e-02
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  5.536e-07   2.096e-07
25- 50  1.299e-06   2.899e-07
50-150  4.264e-06   7.104e-07
15-150  6.116e-06   1.088e-06

Peak spectrum fit

Power-law model

Time interval is from    0.044 sec. to    1.044 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.10804     ( -0.182672   0.181505 )
Norm@50keV  : 8.24408E-02    ( -0.00970206   0.00967261 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          68.97 using 59 PHA bins.
# Reduced chi-squared =          1.210 for     57 degrees of freedom 
# Null hypothesis probability =   1.329337e-01
 
Photon flux (15-150 keV)    in 1 sec: 3.36155E-02 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.59825e-07 ( -1.04089e-07  1.04248e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from    0.044 sec. to    1.044 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.379232     ( -1.20003   0.935097 )
Epeak [keV] : 100.552      ( -19.7677 63.6515 )
Norm@50keV  : 0.331316    ( -0.189886   0.612183 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.76 using 59 PHA bins.
# Reduced chi-squared =          1.085 for     56 degrees of freedom 
# Null hypothesis probability =   3.083305e-01
 
Photon flux (15-150 keV)    in 1 sec: 9.13872 ( -1.18103  1.19118 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.1749e-08 ( 0  0 ) ergs/cm2

Band function

Time interval is from    0.044 sec. to    1.044 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]    : 22.0980  (-2.51093  2.95741)
R^2/D10^2   : 0.358683  (-0.121562   0.172837)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          62.62 using 59 PHA bins.
# Reduced chi-squared =          1.099 for     57 degrees of freedom 
# Null hypothesis probability =   2.837350e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.235e-08   7.460e-09
25- 50  1.715e-07   3.050e-08
50-150  6.258e-07   1.115e-07
15-150  8.296e-07   1.359e-07

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (-24.8211      -200)
Norm        : 40.1450       (-4.82556     4.82556)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          84.00 using 59 PHA bins.
# Reduced chi-squared =          1.474 for     57 degrees of freedom 
# Null hypothesis probability =   1.149300e-02
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  9.993e-08   5.575e-08
25- 50  1.922e-07   1.062e-07
50-150  4.216e-07   2.340e-07
15-150  7.138e-07   3.935e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 3.70857        (-3.70737      10.1979)
R1^2/D10^2  : 56.1416        (-55.7275      -56.1891)
kT2 [keV]   : 23.5914        (-3.05452      5.80454)
R2^2/D10^2  : 0.279393    (-0.176026   0.102227)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.70 using 59 PHA bins.
# Reduced chi-squared =          1.067 for     55 degrees of freedom 
# Null hypothesis probability =   3.413675e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  6.280e-08   2.649e-08
25- 50  1.633e-07   3.710e-08
50-150  6.359e-07   1.346e-07
15-150  8.619e-07   1.618e-07

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: 1.22440     ( -0.101665   0.100306 )
Norm@50keV  : 2.75889E-02    ( -0.00166649   0.0016605 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          76.37 using 59 PHA bins.
# Reduced chi-squared =          1.340 for     57 degrees of freedom 
# Null hypothesis probability =   4.431561e-02
 
Photon flux (15-150 keV)    in 22.13 sec: 3.24994 ( -0.213202  0.214194 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.15238e-06 ( -3.67281e-07  3.6748e-07 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.868278     ( -0.459336   0.390702 )
Epeak [keV] : 194.054      ( -75.8683 -194.054 )
Norm@50keV  : 3.89801E-02    ( -0.0120026   0.0208127 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          74.26 using 59 PHA bins.
# Reduced chi-squared =          1.326 for     56 degrees of freedom 
# Null hypothesis probability =   5.166416e-02
 
Photon flux (15-150 keV)    in 22.13 sec: 3.19367 ( -0.22195  0.2232 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.11494e-06 ( -3.74506e-07  3.73289e-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)  = 1.31e-06
S(50-100 keV) = 2.24e-06

T90 vs. Hardness ratio plot

T90                                   = 19.6560000181198 sec.
Hardness ratio (energy fluence ratio) = 1.70992

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.88611
Count Ratio (50-100 keV) / (15-25 keV) = 2.29164

Mask shadow pattern

IMX = 1.501965875803406E+00, IMY = 4.916569183025535E-01

TIME vs. PHA plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000

TIME vs. DetID plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000

100 us light curve (15-350 keV)

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000

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:
-239.064000 -17.896000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
306.1083  74.7457    3.9  56.1   10.8   3.4748   3.0 ------	UNKNOWN                       
144.8029  80.7874    2.5  34.5   -4.8   1.0748   4.6 ------	UNKNOWN                       
102.7298  57.4891    2.1  36.8  -50.6   1.8265   5.4 ------	UNKNOWN                       
104.9119  39.9630    3.1  41.3  -77.8   3.8740   3.8 ------	UNKNOWN

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

Time interval of the image:
-17.896000 4.236000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
229.3719  52.6456    2.3  42.2   56.4   1.1188   5.1 ------	UNKNOWN                       
209.2385  64.2171    2.4  30.8   38.5   0.3887   4.8 ------	UNKNOWN                       
164.2540  70.9584    2.3  24.2    1.7   0.3174   5.1 ------	UNKNOWN                       
 32.6044  69.9653    0.6  57.7  -18.1   8.3681  20.3 ------	UNKNOWN                       
140.0597   6.0459    2.5  45.0 -147.8   0.5352   4.5 ------	UNKNOWN                       
111.5284  49.0135    3.0  33.5  -67.0   0.4016   3.8 ------	UNKNOWN                       
139.5487  -3.4382    2.4  54.0 -151.5   1.0663   4.7 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
581.236600 963.052300
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
244.9650 -15.6393    0.6  37.9  126.6  24.4954  18.3    0.8	Sco X-1                       
254.4794  35.3897   29.5  16.0  -19.2  -0.1512  -0.4    3.0	Her X-1                       
268.2910  -1.5672    8.8  33.6   80.1  -1.5107  -1.3    8.3	SW J1753.5-0127               
288.8011  10.9521    6.1  44.2   45.4   2.7418   1.9    0.4	GRS 1915+105                  
299.5627  35.2195   10.4  49.8   10.1   1.1965   1.1    1.7	Cyg X-1                       
308.2775  40.9292    5.1  56.5    2.9   4.2591   2.3    7.7	Cyg X-3                       
275.0992   7.1849    0.4  33.6   60.0  26.1279  31.1 ------	UNKNOWN                       
253.5982  58.3089    3.2  36.7  -43.4   2.3134   3.6 ------	UNKNOWN

Plot creation:
Mon Aug  6 22:36:52 EDT 2018