batgrbproduct analysis for trigger=994856

batgrbproduct Analysis for Trigger=994856

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 v2.48
    Process Start Time (local time): Wed Oct 19 23:49:26 EDT 2022
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger994856
======================================================================

  Trigger: 00994856      Segment: 000

  BAT Trigger Time: 621090689.664   [s; MET]
      Trigger Stop: 621090691.712   [s; MET]
               UTC: 2020-09-06T13:11:04.076080    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 272.292956564777   Dec: 67.852260484626  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.66
     Image Trigger?:     NO
     Rate S/N Ratio:     12.328828005938  [ if not an image trigger ]
     Image S/N Ratio:    8.66

  Flight Position:   [ source = BAT ]
    RA: 272.292956564777   Dec: 67.852260484626  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 272.284096593714   Dec: 67.8870513201267  [deg; J2000]  
        { 18h 09m 08.2s , +67d 53' 13.4" }
         +/- 1.43691288830335 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.757150012782727 [arcmin] (formal 1-sigma fit error)
    SNR: 18.122485092025
 
  Angular difference between Flight and Ground position is 2.097034 arcmin
 
  Partial Coding Fraction: 0.9765625    [ including projection effects ]

  Duration
     T90: 70.8999999761581 +/- 7.63030603386452
        Measured from: -0.132000088691711
                   to: 70.7679998874664     [s; relative to TRIGTIME]
     T50: 34.1399998664856 +/- 8.42066502792278
        Measured from: 23.6280000209808
                   to: 57.7679998874664     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 50.9639999866486     
                   to: 51.9639999866486     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -8.7039999961853     
                   to: 90.0119999647141     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     2.209940   2.141895   1.085001   0.185832
           0.066789   0.069626   0.062432   0.060859 [error]
 Peak      0.105233   0.120557   0.081580   0.011145
           0.007971   0.008775   0.007594   0.006367 [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 6.30e-07 8.46e-07 8.37e-07 1.49e-06 2.79e-06 3.80e-06   erg/cm2
              Error 4.45e-08 3.57e-08 6.11e-08 2.28e-07 1.35e-07 2.81e-07   erg/cm2
Peak flux Power-law 9.84e-01 8.43e-01 4.93e-01 4.31e-01 2.51e+00 2.75e+00   ph/cm2/s
              Error 1.24e-01 6.86e-02 6.18e-02 1.06e-01 2.04e-01 2.27e-01   ph/cm2/s
 
Fluence   Cutoff-PL 6.11e-07 8.62e-07 8.31e-07 1.02e-06 2.72e-06 3.32e-06   erg/cm2
              Error 4.00e-08 4.40e-08 6.41e-08 6.25e-07 1.73e-07 6.54e-07   erg/cm2
Peak flux Cutoff-PL 9.95e-01 7.06e-01 3.45e-01 3.35e-01 2.16e+00 2.29e+00   ph/cm2/s
              Error 1.44e-01 1.30e-01 5.76e-02 4.67e-02 3.12e-01 3.45e-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    2.016    0.090    -      -           3.07e-03 1.56e-04   64.450 57
CPL   1.801    0.356      41.0   -2.5      4.02e-03 1.86e-03   63.320 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.774    0.151    -      -           1.84e-02 1.73e-03   56.460 57
CPL   1.471    0.435      81.8  -25.9      2.67e-02 1.82e-02   55.490 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: 67.264000 sec.
T50 in the 50-300 keV band: 31.744000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   98.716   -8.704   90.012
T90    70.900   -0.132   70.768
T50    34.140   23.628   57.768
Peak    1.000   50.964   51.964

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
  272.2841    67.8871   0.0106     8.4086   111.9310         1.6516508     18.122 TRIG_00994856                 
 
Foreground time interval of the image:
 -8.704  28.837 (delta_t =  37.541 [sec])
Background time interval of the image:
-239.664  -8.704 (delta_t = 230.960 [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   -8.704 sec. to   90.012 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.01588     ( -0.0892416   0.0909078 )
Norm@50keV  : 3.06982E-03    ( -0.00015711   0.000155569 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   64.45     using 59 bins.
 Reduced chi-squared = 1.1307
# Null hypothesis probability of 2.32e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 98.72 sec: 0.463903 ( -0.02047  0.020524 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.79772e-06 ( -1.33964e-07  1.35161e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from   -8.704 sec. to   90.012 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.80067     ( -0.372335   0.340125 )
Epeak [keV] : 40.9927      ( -35.9387 -40.9927 )
Norm@50keV  : 4.01712E-03    ( -0.00138091   0.00233215 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   63.32     using 59 bins.
 Reduced chi-squared = 1.13071
# Null hypothesis probability of 2.34e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 98.72 sec: 0.456592 ( -0.023395  0.023426 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.72719e-06 ( -1.71871e-07  1.73459e-07 ) ergs/cm2

Band function

Time interval is from   -8.704 sec. to   90.012 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]    : 10.4866  (  )
R^2/D10^2   : 0.166706  (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                  174.16     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 8.57e-14 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.739e-07   2.927e-08
25- 50  9.928e-07   4.847e-08
50-150  5.936e-07   6.826e-08
15-150  1.960e-06   9.724e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 69.5078       (-9.63191      12.2007)
Norm        : 2.21968       (-0.169743     0.189223)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   67.81     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 1.55e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  5.618e-07   3.485e-08
25- 50  8.921e-07   3.993e-08
50-150  1.140e-06   1.239e-07
15-150  2.594e-06   1.387e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 5.82979        (-0.995301      1.03187)
R1^2/D10^2  : 1.13774        (-0.402417      0.839529)
kT2 [keV]   : 19.8578        (-3.40867      5.02604)
R2^2/D10^2  : 1.03923E-02    (-0.00493181   0.00936082)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   69.30     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 9.29e-02 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  5.643e-07   1.552e-07
25- 50  8.427e-07   1.688e-07
50-150  1.169e-06   3.306e-07
15-150  2.576e-06   6.476e-07

Peak spectrum fit

Power-law model

Time interval is from   50.964 sec. to   51.964 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.77392     ( -0.148034   0.153426 )
Norm@50keV  : 1.83741E-02    ( -0.00174945   0.00171936 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   56.46     using 59 bins.
 Reduced chi-squared = 0.990526
# Null hypothesis probability of 4.95e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 2.50689 ( -0.2039  0.20395 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.6936e-07 ( -1.64732e-08  1.67201e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   50.964 sec. to   51.964 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.47093     ( -0.578566   0.291179 )
Epeak [keV] : 81.7905      ( -29.915 -81.7954 )
Norm@50keV  : 2.66761E-02    ( -0.00967686   0.0266895 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   55.49     using 59 bins.
 Reduced chi-squared = 0.990893
# Null hypothesis probability of 4.94e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 2.16463 ( -0.31997  0.30415 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.6523e-07 ( -1.7785e-08  1.80732e-08 ) ergs/cm2

Band function

Time interval is from   50.964 sec. to   51.964 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]    : 12.5302  (-1.36201  1.52699)
R^2/D10^2   : 0.508591  (-0.171566   0.261787)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   98.17     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 5.76e-04 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.693e-08   2.535e-09
25- 50  5.600e-08   5.400e-09
50-150  5.436e-08   9.940e-09
15-150  1.273e-07   1.425e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 115.556       (-33.3527      52.138)
Norm        : 10.6187       (-1.06763     1.35854)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   55.97     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 5.14e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.770e-08   3.135e-09
25- 50  4.922e-08   5.245e-09
50-150  8.620e-08   3.239e-08
15-150  1.631e-07   4.015e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 4.69593        (-1.07875      1.30625)
R1^2/D10^2  : 13.0189        (-8.17431      29.5948)
kT2 [keV]   : 19.4776        (-3.00798      4.14371)
R2^2/D10^2  : 8.58823E-02    (-0.0447328   0.0771022)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   51.61     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 6.05e-01 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.081e-08   1.380e-08
25- 50  4.469e-08   1.110e-08
50-150  8.738e-08   2.403e-08
15-150  1.629e-07   4.220e-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: 1.98020     ( -0.149413   0.155555 )
Norm@50keV  : 2.34779E-03    ( -0.000239411   0.00023577 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   50.38     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 7.20e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 37.54 sec: 0.349001 ( -0.0271464  0.0271495 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.12005e-07 ( -7.78929e-08  7.96107e-08 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.934900     ( -0.986284   0.772215 )
Epeak [keV] : 39.9618      ( -8.0602 12.124 )
Norm@50keV  : 9.83426E-03    ( -0.00983912   0.0292691 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   44.67     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 8.62e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 37.54 sec: 0.332701 ( -0.029239  0.029372 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.14968e-07 ( -9.10533e-08  1.01407e-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)  = 8.46e-07
S(50-100 keV) = 8.37e-07

T90 vs. Hardness ratio plot

T90                                   = 70.8999999761581 sec.
Hardness ratio (energy fluence ratio) = 0.989362

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 0.96921
Count Ratio (50-100 keV) / (15-25 keV) = 0.490964

Mask shadow pattern

IMX = -5.520936979141938E-02, IMY = -1.371229878208657E-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:
-239.664000 -8.704000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.5943  35.1929   43.0  37.2  175.9  -0.1222  -0.3   11.2	Her X-1                       
180.9041  78.3669    2.4  17.5  -38.5   1.3093   4.7 ------	UNKNOWN

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

Time interval of the image:
-8.704000 28.836600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.3063  35.2777    8.4  37.1  176.3   0.1704   1.4    8.4	Her X-1                       
343.6835  73.6398    2.5  24.5   43.5   0.4409   4.5 ------	UNKNOWN                       
272.2841  67.8872    0.6   8.4  111.9   1.6530  18.1 ------	UNKNOWN                       
212.1647  29.8510    2.9  47.2 -131.4   1.2942   4.0 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
56.036590 962.456000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.6064  35.1829    0.0  34.2 -171.3  -0.9292  -1.0   12.0	Her X-1                       
299.6737  35.0693    4.2  36.3  123.0   5.2934   2.7    8.9	Cyg X-1                       
308.0082  40.9917    4.5  33.0  108.5   3.6159   2.6    5.2	Cyg X-3                       
  3.8037  48.5177    3.8  46.6   48.2   8.1696   3.0 ------	UNKNOWN                       
252.3376  11.2809    2.2  58.1 -174.3  20.5034   5.2 ------	UNKNOWN                       
248.8190  18.2527    2.3  51.8 -168.8  12.4492   5.0 ------	UNKNOWN                       
207.4460  44.6825    4.7  40.1 -108.9   6.5067   2.5 ------	UNKNOWN

Plot creation:
Thu Oct 20 00:51:16 EDT 2022