batgrbproduct analysis for trigger=1197311

batgrbproduct Analysis for Trigger=1197311

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): Tue Dec 26 15:35:50 EST 2023
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1197311
======================================================================

  Trigger: 01197311      Segment: 000

  BAT Trigger Time: 722020625.6   [s; MET]
      Trigger Stop: 722020626.624   [s; MET]
               UTC: 2023-11-18T17:16:33.206740    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 4.84300825958335   Dec: -48.0355229992106  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    20.93
     Image Trigger?:     NO
     Rate S/N Ratio:     109.261155036911  [ if not an image trigger ]
     Image S/N Ratio:    20.93

  Flight Position:   [ source = BAT ]
    RA: 4.84300825958335   Dec: -48.0355229992106  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 4.84002144555348   Dec: -48.0435836136321  [deg; J2000]  
        { 00h 19m 21.6s , -48d 02' 36.9" }
         +/- 0.771656755759291 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.276696807313094 [arcmin] (formal 1-sigma fit error)
    SNR: 44.0495021802502
 
  Angular difference between Flight and Ground position is 0.498259 arcmin
 
  Partial Coding Fraction: 0.5546875    [ including projection effects ]

  Duration
     T90: 151.488000035286 +/- 94.0267835021085
        Measured from: -4.28799998760223
                   to: 147.200000047684     [s; relative to TRIGTIME]
     T50: 6.94400000572205 +/- 7.22240067068257
        Measured from: -1.27999997138977
                   to: 5.66400003433228     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.0759999752044678     
                   to: 0.924000024795532     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -6.84800004959106     
                   to: 250.447999954224     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.479493   2.282292   1.915264   0.661529
           0.107738   0.112908   0.098957   0.084262 [error]
 Peak      0.228087   0.405804   0.420003   0.143980
           0.014191   0.017673   0.017622   0.013066 [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 4.97e-07 9.78e-07 1.49e-06 4.99e-06 4.19e-06 7.95e-06   erg/cm2
              Error 5.06e-08 5.86e-08 9.87e-08 7.42e-07 2.43e-07 8.02e-07   erg/cm2
Peak flux Power-law 6.12e-04 9.28e-03 1.07e-01 9.38e+00 4.73e-01 9.40e+00   ph/cm2/s
              Error -------- -------- -------- -------- -------- --------   ph/cm2/s
 
Fluence   Cutoff-PL 4.99e-07 9.75e-07 1.49e-06 5.02e-06 4.19e-06 7.69e-06   erg/cm2
              Error 5.85e-08 6.14e-08 1.07e-07 1.42e-06 2.38e-07 1.36e-06   erg/cm2
Peak flux Cutoff-PL 2.12e+00 3.11e+00 2.90e+00 2.57e+00 9.42e+00 1.07e+01   ph/cm2/s
              Error 2.71e-01 1.84e-01 1.78e-01 7.88e-01 4.71e-01 9.13e-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    1.387    0.097    -      -           1.68e-03 8.94e-05   55.720 57
CPL   1.373    0.220    9930.3    0.0      1.70e-03 4.02e-04   55.870 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.143    0.078    -      -           8.25e-02 3.80e-03   55.800 57
CPL   0.606    0.344     145.0   85.7      1.46e-01 5.32e-02   47.750 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: 68.352000 sec.
T50 in the 50-300 keV band: 3.712000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100  257.296   -6.848  250.448
T90   151.488   -4.288  147.200
T50     6.944   -1.280    5.664
Peak    1.000   -0.076    0.924

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
    4.8400   -48.0436   0.0044    33.6517  -134.2177         4.8647375     44.050 TRIG_01197311                 
 
Foreground time interval of the image:
 -6.848  12.701 (delta_t =  19.549 [sec])
Background time interval of the image:
-239.600  -6.848 (delta_t = 232.752 [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

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   -6.848 sec. to  250.448 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.38705     ( -0.0971427   0.0967608 )
Norm@50keV  : 1.67784E-03    ( -8.93955e-05   8.93589e-05 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   55.72     using 59 bins.
 Reduced chi-squared = 0.977544
# Null hypothesis probability of 5.23e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 257.3 sec: 0.203741 ( -0.011428  0.011461 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.18311e-06 ( -2.42711e-07  2.43795e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from   -6.848 sec. to  250.448 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.37320     ( -0.341149   0.099298 )
Epeak [keV] : 9930.27      ( -9999.36 -9999.36 )
Norm@50keV  : 1.70310E-03    ( -8.96053e-05   0.000714042 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   55.87     using 59 bins.
 Reduced chi-squared = 0.997679
# Null hypothesis probability of 4.80e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 257.3 sec: 0.203997 ( -0.012474  0.011665 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.18967e-06 ( -2.72702e-07  2.02307e-07 ) ergs/cm2

Band function

Time interval is from   -6.848 sec. to  250.448 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]    : 17.0290  (  )
R^2/D10^2   : 1.48640E-02  (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                  149.95     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 2.71e-10 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.258e-07   2.619e-08
25- 50  1.000e-06   8.259e-08
50-150  2.072e-06   2.043e-07
15-150  3.298e-06   2.264e-07

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (-15.7392      -200)
Norm        : 0.846203       (-0.0452541     0.0452541)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   67.00     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 1.71e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  5.421e-07   3.023e-08
25- 50  1.043e-06   6.497e-08
50-150  2.287e-06   3.759e-07
15-150  3.872e-06   2.856e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 7.70173        (-1.30333      1.48159)
R1^2/D10^2  : 0.152699        (-0.0660157      0.13408)
kT2 [keV]   : 33.2436        (-6.26878      11.6319)
R2^2/D10^2  : 1.29737E-03    (-0.000775909   0.00131919)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   56.93     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 4.03e-01 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.632e-07   7.668e-08
25- 50  1.017e-06   1.537e-07
50-150  2.739e-06   7.193e-07
15-150  4.219e-06   1.031e-06

Peak spectrum fit

Power-law model

Time interval is from   -0.076 sec. to    0.924 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.14325     ( -0.0784511   0.0780846 )
Norm@50keV  : 8.25499E-02    ( -0.00379928   0.00379875 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   55.80     using 59 bins.
 Reduced chi-squared = 0.978947
# Null hypothesis probability of 5.20e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 0.473115 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.51628e-07 ( -4.30722e-08  4.32009e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.076 sec. to    0.924 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.606252     ( -0.357336   0.330102 )
Epeak [keV] : 145.042      ( -36.884 134.506 )
Norm@50keV  : 0.145644    ( -0.0420186   0.0644659 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   47.75     using 59 bins.
 Reduced chi-squared = 0.852679
# Null hypothesis probability of 7.76e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 9.42416 ( -0.47077  0.47071 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.90766e-07 ( -2.88387e-08  2.40467e-08 ) ergs/cm2

Band function

Time interval is from   -0.076 sec. to    0.924 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]    : 19.5176  (-1.12102  1.21352)
R^2/D10^2   : 0.496344  (-0.089104   0.106488)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                  107.21     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 6.48e-05 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.680e-08   3.335e-09
25- 50  1.803e-07   1.110e-08
50-150  5.073e-07   4.330e-08
15-150  7.244e-07   3.950e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 199.363       (      )
Norm        : 39.6196       (     )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                  124.89     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 5.50e-07 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  9.866e-08   4.935e-09
25- 50  1.898e-07   9.050e-09
50-150  4.162e-07   2.270e-08
15-150  7.047e-07   3.930e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 9.52586        (-2.44594      2.66304)
R1^2/D10^2  : 2.67729        (-1.19419      3.39903)
kT2 [keV]   : 32.2874        (-6.36692      15.2269)
R2^2/D10^2  : 7.57423E-02    (-0.0539508   0.0919651)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   50.74     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 6.38e-01 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  6.037e-08   1.183e-08
25- 50  1.875e-07   3.825e-08
50-150  5.849e-07   1.512e-07
15-150  8.327e-07   2.173e-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: 1.40727     ( -0.0588465   0.0588206 )
Norm@50keV  : 1.73919E-02    ( -0.000562581   0.000562574 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   54.21     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 5.81e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 19.55 sec: 2.12154 ( -0.0738243  0.0739837 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.28057e-06 ( -1.13556e-07  1.13755e-07 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.15479     ( -0.246158   0.233147 )
Epeak [keV] : 183.557      ( -64.2596 1074.57 )
Norm@50keV  : 2.27661E-02    ( -0.0048678   0.00662773 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   50.79     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 6.72e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 19.55 sec: 2.08953 ( -0.079  0.07925 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.23332e-06 ( -1.23282e-07  1.22696e-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)  = 9.78e-07
S(50-100 keV) = 1.49e-06

T90 vs. Hardness ratio plot

T90                                   = 151.488000035286 sec.
Hardness ratio (energy fluence ratio) = 1.52352

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.54262
Count Ratio (50-100 keV) / (15-25 keV) = 1.29454

Mask shadow pattern

IMX = -4.642506576847473E-01, IMY = 4.771047898462376E-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:
-239.600000 -6.848000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 52.6470 -30.1047    2.9  45.7  162.8   3.3520   4.1 ------	UNKNOWN                       
312.7461   2.2456    2.2  55.2  -32.3   9.2798   5.3 ------	UNKNOWN

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

Time interval of the image:
-6.848000 12.700590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
334.8134  30.1612    2.3  53.7   10.9   1.9574   5.0 ------	UNKNOWN                       
 60.7956 -46.0940    2.9  55.6 -178.9   1.2162   4.0 ------	UNKNOWN                       
326.8634  14.1058    2.8  48.0  -10.7   0.6643   4.0 ------	UNKNOWN                       
 60.2243 -56.8071    2.2  58.9 -166.8   2.7479   5.3 ------	UNKNOWN                       
315.7638  16.8041    2.1  58.5  -15.0   2.6172   5.5 ------	UNKNOWN                       
  4.8400 -48.0436    0.3  33.7 -134.2   4.8643  44.0 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
83.500600 962.531700
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 76.2666 -48.5982    3.3  45.7  162.8  10.6251   3.5 ------	UNKNOWN                       
113.9720 -68.9348    3.5  52.0 -161.5   9.9853   3.3 ------	UNKNOWN

Plot creation:
Tue Dec 26 17:00:33 EST 2023