batgrbproduct analysis for trigger=1142847

batgrbproduct Analysis for Trigger=1142847

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): Fri Oct 13 22:47:03 EDT 2023
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1142847
======================================================================

  Trigger: 01142847      Segment: 000

  BAT Trigger Time: 691590336   [s; MET]
      Trigger Stop: 691590400   [s; MET]
               UTC: 2022-12-01T12:25:05.684420    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 266.933488910624   Dec: -68.2595112495696  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    15.65
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    15.65

  Flight Position:   [ source = BAT ]
    RA: 266.933488910624   Dec: -68.2595112495696  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 266.902237638968   Dec: -68.2297450175881  [deg; J2000]  
        { 17h 47m 36.5s , -68d 13' 47.1" }
         +/- 0.842356941330918 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.315855591279388 [arcmin] (formal 1-sigma fit error)
    SNR: 38.8644421748075
 
  Angular difference between Flight and Ground position is 1.916431 arcmin
 
  Partial Coding Fraction: 0.515625    [ including projection effects ]

  Duration
     T90: 33.7199999094009 +/- 2.03901935339401
        Measured from: -18.7599999904633
                   to: 14.9599999189377     [s; relative to TRIGTIME]
     T50: 12.6920000314713 +/- 0.832742397966511
        Measured from: -13.3200000524521
                   to: -0.628000020980835     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -13.5080000162125     
                   to: -12.5080000162125     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -20.8839999437332     
                   to: 22.9199999570847     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     3.691125   5.154171   3.648393   0.834620
           0.098010   0.100579   0.085387   0.064809 [error]
 Peak      0.240487   0.449703   0.518359   0.167044
           0.018539   0.023060   0.023549   0.016920 [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 1.32e-06 2.25e-06 2.90e-06 7.53e-06 8.54e-06 1.40e-05   erg/cm2
              Error 6.68e-08 6.56e-08 9.06e-08 5.34e-07 2.23e-07 5.82e-07   erg/cm2
Peak flux Power-law 7.71e-04 1.11e-02 1.03e-01 1.10e+01 4.57e-01 1.09e+01   ph/cm2/s
              Error -------- -------- -------- -------- -------- --------   ph/cm2/s
 
Fluence   Cutoff-PL 1.25e-06 2.28e-06 2.95e-06 5.47e-06 8.41e-06 1.20e-05   erg/cm2
              Error 8.54e-08 7.13e-08 1.01e-07 1.32e-06 2.46e-07 1.34e-06   erg/cm2
Peak flux Cutoff-PL 2.27e+00 3.44e+00 3.50e+00 4.10e+00 1.10e+01 1.33e+01   ph/cm2/s
              Error 3.22e-01 2.32e-01 2.40e-01 1.36e+00 5.93e-01 1.46e+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    1.633    0.048    -      -           2.09e-02 5.30e-04   79.990 57
CPL   1.389    0.191     135.8  137.8      2.71e-02 5.46e-03   74.990 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.015    0.086    -      -           9.65e-02 4.96e-03   58.170 57
CPL   0.629    0.358     205.8  433.5      1.44e-01 5.33e-02   54.480 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: 24.128000 sec.
T50 in the 50-300 keV band: 5.568000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   43.804  -20.884   22.920
T90    33.720  -18.760   14.960
T50    12.692  -13.320   -0.628
Peak    1.000  -13.508  -12.508

Click here for the BAT GCN circular template

Special notes of this burst

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
  266.9022   -68.2297   0.0049    34.2185   -38.6316         9.6602545     38.864 TRIG_01142847                 
 
Foreground time interval of the image:
-13.299  22.920 (delta_t =  36.219 [sec])
Background time interval of the image:

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

8 ms binning

From T100_start-3 s to T100_start+3 s

2 ms binning

From T100_start-1 s to T100_start+1 s

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  -20.884 sec. to   22.920 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.63299     ( -0.0476073   0.0476358 )
Norm@50keV  : 2.09075E-02    ( -0.000529787   0.000529753 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   79.99     using 59 bins.
 Reduced chi-squared = 1.40333
# Null hypothesis probability of 2.40e-02 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 43.8 sec: 2.71500 ( -0.07862  0.07891 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.53303e-06 ( -2.22395e-07  2.22737e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from  -20.884 sec. to   22.920 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.38947     ( -0.19547   0.187071 )
Epeak [keV] : 135.829      ( -37.3972 238.167 )
Norm@50keV  : 2.71193E-02    ( -0.00479441   0.00612133 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   74.99     using 59 bins.
 Reduced chi-squared = 1.33911
# Null hypothesis probability of 4.59e-02 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 43.8 sec: 2.66422 ( -0.08673  0.08715 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.39585e-06 ( -2.46663e-07  2.45752e-07 ) ergs/cm2

Band function

Time interval is from  -20.884 sec. to   22.920 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]    : 15.5476  (  )
R^2/D10^2   : 0.251672  (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                  404.67     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 7.05e-54 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  5.543e-07   2.869e-08
25- 50  2.275e-06   8.212e-08
50-150  3.800e-06   1.653e-07
15-150  6.629e-06   1.949e-07

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 179.203       (-23.1678      -178.938)
Norm        : 10.9052       (-0.334244     0.362202)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   75.70     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 4.94e-02 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.205e-06   5.957e-08
25- 50  2.288e-06   1.314e-07
50-150  4.838e-06   1.100e-06
15-150  8.331e-06   1.194e-06

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 8.13365        (-0.697628      0.720807)
R1^2/D10^2  : 1.77143        (-0.429805      0.623494)
kT2 [keV]   : 29.7536        (-3.09995      4.1556)
R2^2/D10^2  : 1.87543E-02    (-0.00692671   0.00942515)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   77.81     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 2.32e-02 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.054e-06   7.227e-08
25- 50  2.395e-06   1.303e-07
50-150  4.879e-06   4.187e-07
15-150  8.327e-06   4.687e-07

Peak spectrum fit

Power-law model

Time interval is from  -13.508 sec. to  -12.508 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.01451     ( -0.0860821   0.0851776 )
Norm@50keV  : 9.65000E-02    ( -0.00496326   0.004957 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   58.17     using 59 bins.
 Reduced chi-squared = 1.02053
# Null hypothesis probability of 4.32e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 0.456917 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.03829e-06 ( -5.72652e-08  5.74058e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from  -13.508 sec. to  -12.508 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.628913     ( -0.373398   0.343528 )
Epeak [keV] : 205.840      ( -73.6344 793.272 )
Norm@50keV  : 0.143608    ( -0.041917   0.0647199 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   54.48     using 59 bins.
 Reduced chi-squared = 0.972857
# Null hypothesis probability of 5.33e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 10.9978 ( -0.5928  0.593 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.02542e-06 ( -5.96583e-08  5.93309e-08 ) ergs/cm2

Band function

Time interval is from  -13.508 sec. to  -12.508 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]    : 21.6565  (-1.44083  1.58702)
R^2/D10^2   : 0.425332  (-0.0854543   0.104394)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                  108.60     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 4.56e-05 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.718e-08   3.780e-09
25- 50  1.948e-07   1.465e-08
50-150  6.822e-07   5.030e-08
15-150  9.141e-07   5.890e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 199.363       (      )
Norm        : 45.0096       (     )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                  160.59     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 8.46e-12 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.121e-07   5.850e-09
25- 50  2.156e-07   1.330e-08
50-150  4.728e-07   7.735e-08
15-150  8.005e-07   8.745e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 11.1244        (-2.87345      3.18892)
R1^2/D10^2  : 2.03291        (-0.885411      2.30005)
kT2 [keV]   : 42.4862        (-11.6435      81.2611)
R2^2/D10^2  : 4.06712E-02    (-0.0336264   0.0756879)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   55.80     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 4.44e-01 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  6.174e-08   1.214e-08
25- 50  2.140e-07   4.565e-08
50-150  7.528e-07   2.987e-07
15-150  1.029e-06   3.280e-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: 1.75478     ( -0.0547709   0.0549511 )
Norm@50keV  : 1.84237E-02    ( -0.000550068   0.000549575 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   75.55     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 5.06e-02 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 36.22 sec: 2.49559 ( -0.082262  0.0825604 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.15581e-06 ( -1.87749e-07  1.8797e-07 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.37399     ( -0.235367   0.223009 )
Epeak [keV] : 84.5512      ( -14.7019 45.9655 )
Norm@50keV  : 2.82021E-02    ( -0.00608095   0.00828675 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   66.75     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 1.54e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 36.22 sec: 2.42697 ( -0.0903  0.09068 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.988e-06 ( -2.13118e-07  2.12141e-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)  = 2.25e-06
S(50-100 keV) = 2.90e-06

T90 vs. Hardness ratio plot

T90                                   = 33.7199999094009 sec.
Hardness ratio (energy fluence ratio) = 1.28889

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.39637
Count Ratio (50-100 keV) / (15-25 keV) = 0.988423

Mask shadow pattern

IMX = 5.312556052117654E-01, IMY = 4.245756649878484E-01

TIME vs. PHA plot around the trigger time

TIME vs. DetID plot around the trigger time

100 us light curve (15-350 keV)

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:
-13.299410 22.920000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5291 -40.5548   56.2  33.2  114.3  -0.0546  -0.2    0.0	Vela X-1                      
170.4636 -60.4776    4.5   4.0  122.2   0.4228   2.6    9.8	Cen X-3                       
186.6666 -62.8088    2.0   4.2  -81.2   0.8384   5.8    2.3	GX 301-2                      
 95.6286 -53.5340    2.8  41.2   66.0   1.9002   4.2 ------	UNKNOWN                       
 63.4220 -58.3858    2.3  48.9   42.1   2.9700   5.0 ------	UNKNOWN                       
152.9869 -23.4125    3.1  42.6  148.3   1.3727   3.8 ------	UNKNOWN                       
 69.2969 -74.8706    2.5  34.9   28.3   0.9191   4.7 ------	UNKNOWN                       
122.0019 -70.2876    2.5  22.5   49.2   0.8350   4.7 ------	UNKNOWN                       
266.9022 -68.2297    0.3  34.2  -38.6   9.6580  38.8 ------	UNKNOWN                       
191.8339  -6.0270    2.0  57.6 -160.5   5.3874   5.6 ------	UNKNOWN                       
195.1307 -11.8913    3.0  52.3 -155.5   1.8157   3.9 ------	UNKNOWN                       
214.1379 -29.7618    2.0  40.4 -124.5   2.3881   5.9 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
158.300590 830.239400
831.000000 833.909500
835.000000 940.958000
942.000000 963.045400
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
170.4508 -60.5959    5.3  38.0  167.1   2.2767   2.2    4.3	Cen X-3                       
186.5595 -62.7622    1.4  31.3  174.8   6.4980   8.1    2.7	GX 301-2                      
255.9366 -37.8641    2.2  31.0  -82.4   5.6044   5.2    2.7	4U 1700-377                   
256.3407 -36.3650    6.2  32.4  -81.4   2.2974   1.9    5.8	GX 349+2                      
264.6472 -44.6356    0.0  23.6  -69.4  -0.1243  -0.1   11.9	4U 1735-44                    
270.3211 -24.9375    2.1  43.3  -60.9  12.2037   5.4    8.7	GX 5-1                        
270.2047 -25.6247    5.2  42.6  -61.0   4.7406   2.2    8.9	GRS 1758-258                  
275.7564 -30.2820    5.5  38.3  -53.0   2.8224   2.1   10.1	H1820-303                     
284.8530 -24.8665   11.4  44.7  -42.0  -1.5452  -1.0   10.5	HT1900.1-2455                 
262.7680 -33.7399    0.0  34.6  -71.5  -2.1311  -1.5   12.4	GX 354-0                      
327.7949 -70.9172    3.0  20.5   60.0   3.0256   3.8 ------	UNKNOWN                       
310.4203 -30.9769    2.5  44.9   -8.6   4.2297   4.6 ------	UNKNOWN                       
188.7730 -35.5829    3.0  53.0 -159.7   7.4803   3.8 ------	UNKNOWN

Plot creation:
Fri Oct 13 22:56:46 EDT 2023