batgrbproduct analysis for trigger=1251252

batgrbproduct Analysis for Trigger=1251252

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): Sat Oct 19 14:52:47 EDT 2024
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1251252
======================================================================

  Trigger: 01251252      Segment: 000

  BAT Trigger Time: 746596622.528   [s; MET]
      Trigger Stop: 746596623.552   [s; MET]
               UTC: 2024-08-29T03:56:28.451440    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 143.059023378014   Dec: -18.7280334116614  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8
     Image Trigger?:     NO
     Rate S/N Ratio:     15.6843871413581  [ if not an image trigger ]
     Image S/N Ratio:    8

  Flight Position:   [ source = BAT ]
    RA: 143.059023378014   Dec: -18.7280334116614  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 143.070597139097   Dec: -18.6953818833994  [deg; J2000]  
        { 09h 32m 16.9s , -18d 41' 43.4" }
         +/- 1.35092168384343 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.555747931763791 [arcmin] (formal 1-sigma fit error)
    SNR: 19.7926455635584
 
  Angular difference between Flight and Ground position is 2.066552 arcmin
 
  Partial Coding Fraction: 0.1523438    [ including projection effects ]

  Duration
     T90: 42.9760000705719 +/- 8.63934814855529
        Measured from: -0.407999992370605
                   to: 42.5680000782013     [s; relative to TRIGTIME]
     T50: 18.768000125885 +/- 2.06120737623349
        Measured from: 3.68799996376038
                   to: 22.4560000896454     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.187999963760376     
                   to: 1.18799996376038     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -1.91199994087219     
                   to: 51.8960000276566     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.635279   2.288953   1.617613   0.414449
           0.120416   0.127477   0.107685   0.086575 [error]
 Peak      0.097912   0.112859   0.145511   0.006566
           0.017838   0.020798   0.019729   0.012876 [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 6.24e-07 1.01e-06 1.23e-06 2.94e-06 3.70e-06 5.81e-06   erg/cm2
              Error 6.55e-08 6.56e-08 1.07e-07 5.38e-07 2.56e-07 6.28e-07   erg/cm2
Peak flux Power-law 1.17e+00 8.59e-01 4.19e-01 2.91e-01 2.58e+00 2.74e+00   ph/cm2/s
              Error 2.71e-01 1.60e-01 9.94e-02 1.13e-01 4.85e-01 5.09e-01   ph/cm2/s
 
Fluence   Cutoff-PL 5.92e-07 1.04e-06 1.25e-06 1.80e-06 3.62e-06 4.69e-06   erg/cm2
              Error 7.68e-08 8.10e-08 1.15e-07 1.05e-06 2.78e-07 1.11e-06   erg/cm2
Peak flux Cutoff-PL 6.99e-01 1.26e+00 7.39e-01 9.03e-02 2.78e+00 2.79e+00   ph/cm2/s
              Error 3.12e-01 2.28e-01 1.90e-01 6.63e-02 4.94e-01 4.97e-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    1.716    0.111    -      -           7.43e-03 4.94e-04   52.930 57
CPL   1.384    0.424      91.3  -30.8      1.10e-02 5.86e-03   51.160 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    2.032    0.228    -      -           1.70e-02 3.43e-03   88.440 57
CPL  -1.012    1.392      54.2    7.9      5.42e-01 1.45e+00   64.820 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: 24.896000 sec.
T50 in the 50-300 keV band: 13.888000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   53.808   -1.912   51.896
T90    42.976   -0.408   42.568
T50    18.768    3.688   22.456
Peak    1.000    0.188    1.188

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
  143.0706   -18.6954   0.0098    39.3127   -67.3756         6.4092520     19.793 TRIG_01251252                 
 
Foreground time interval of the image:
 -1.912  51.896 (delta_t =  53.808 [sec])
Background time interval of the image:
-239.528  -1.912 (delta_t = 237.616 [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   -1.912 sec. to   51.896 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.71554     ( -0.110703   0.112221 )
Norm@50keV  : 7.43210E-03    ( -0.000495091   0.000492236 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   52.93     using 59 bins.
 Reduced chi-squared = 0.928596
# Null hypothesis probability of 6.29e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 53.81 sec: 0.992527 ( -0.065138  0.065253 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.69899e-06 ( -2.55706e-07  2.5707e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from   -1.912 sec. to   51.896 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.38429     ( -0.466701   0.380825 )
Epeak [keV] : 91.2945      ( -29.6696 -91.2945 )
Norm@50keV  : 1.10040E-02    ( -0.00385333   0.0078761 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   51.16     using 59 bins.
 Reduced chi-squared = 0.913571
# Null hypothesis probability of 6.58e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 53.81 sec: 0.977741 ( -0.067834  0.067849 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.6162e-06 ( -2.7823e-07  2.77949e-07 ) ergs/cm2

Band function

Time interval is from   -1.912 sec. to   51.896 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]    : 13.4998  (-1.06189  1.1479)
R^2/D10^2   : 0.155607  (-0.040623   0.0548569)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                  112.09     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 1.85e-05 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.232e-07   3.890e-08
25- 50  1.159e-06   9.497e-08
50-150  1.364e-06   1.838e-07
15-150  2.845e-06   2.260e-07

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 135.843       (-33.8041      46.3495)
Norm        : 4.10405       (-0.316191     0.396858)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   51.36     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 6.86e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  5.715e-07   5.696e-08
25- 50  1.043e-06   1.020e-07
50-150  1.974e-06   6.511e-07
15-150  3.589e-06   7.517e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 6.21235        (-1.157      1.37977)
R1^2/D10^2  : 1.71472        (-0.858705      2.00117)
kT2 [keV]   : 22.5717        (-3.59875      5.82393)
R2^2/D10^2  : 1.85087E-02    (-0.010782   0.0181826)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   51.10     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 6.25e-01 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  5.894e-07   1.453e-07
25- 50  1.032e-06   2.163e-07
50-150  1.952e-06   5.602e-07
15-150  3.574e-06   8.217e-07

Peak spectrum fit

Power-law model

Time interval is from    0.188 sec. to    1.188 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.03213     ( -0.216063   0.240079 )
Norm@50keV  : 1.69578E-02    ( -0.0034507   0.00340288 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   88.44     using 59 bins.
 Reduced chi-squared = 1.55158
# Null hypothesis probability of 4.80e-03 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 2.58250 ( -0.48487  0.48524 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.56664e-07 ( -3.07193e-08  3.07836e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    0.188 sec. to    1.188 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.01212     ( -1.5998   1.1843 )
Epeak [keV] : 54.2117      ( -7.74061 7.99559 )
Norm@50keV  : 0.542129    ( -0.539476   2.36617 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   64.82     using 59 bins.
 Reduced chi-squared = 1.1575
# Null hypothesis probability of 1.96e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 2.78080 ( -0.49311  0.49396 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.89845e-07 ( -3.42986e-08  3.45174e-08 ) ergs/cm2

Band function

Time interval is from    0.188 sec. to    1.188 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]    : 14.0990  (-1.93579  1.97897)
R^2/D10^2   : 0.464994  (-0.183081   0.321569)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   64.81     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 2.23e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.951e-08   5.710e-09
25- 50  7.308e-08   1.678e-08
50-150  9.599e-08   3.132e-08
15-150  1.886e-07   4.455e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 73.2069       (-21.0248      30.9265)
Norm        : 13.9888       (-2.94297     3.31019)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   77.14     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 3.90e-02 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.605e-08   8.070e-09
25- 50  5.804e-08   1.088e-08
50-150  7.703e-08   3.290e-08
15-150  1.711e-07   4.125e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 4.65700        (-4.64012      67.5868)
R1^2/D10^2  : 5.57393        (-5.70931      -5.70931)
kT2 [keV]   : 15.1047        (-2.33234      3.10107)
R2^2/D10^2  : 0.332955    (-0.334846   0.323604)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   63.31     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 2.06e-01 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.600e-08   1.353e-08
25- 50  6.904e-08   3.477e-08
50-150  9.910e-08   5.994e-08
15-150  1.941e-07   1.081e-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: 1.71554     ( -0.110703   0.112221 )
Norm@50keV  : 7.43210E-03    ( -0.000495091   0.000492236 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   52.93     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 6.29e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 53.81 sec: 0.992484 ( -0.0651329  0.0652452 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.69845e-06 ( -2.5588e-07  2.57072e-07 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.38429     ( -0.466701   0.380825 )
Epeak [keV] : 91.2945      ( -29.6695 -91.2945 )
Norm@50keV  : 1.10040E-02    ( -0.00385333   0.0078761 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   51.16     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 6.58e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 53.81 sec: 0.977583 ( -0.067808  0.067827 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.61736e-06 ( -2.78295e-07  2.78144e-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)  = 1.01e-06
S(50-100 keV) = 1.23e-06

T90 vs. Hardness ratio plot

T90                                   = 42.9760000705719 sec.
Hardness ratio (energy fluence ratio) = 1.21782

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.39973
Count Ratio (50-100 keV) / (15-25 keV) = 0.989197

Mask shadow pattern

IMX = 3.150063776940881E-01, IMY = 7.558474122916268E-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:
-239.528000 -1.912000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6100  22.0284    0.9  43.9  170.9   9.6638  13.1    1.5	Crab                          
135.5661 -40.5038    3.2  36.7  -30.3   1.7832   3.6    3.5	Vela X-1                      
 95.0228  13.0290    3.4  31.9 -176.9   1.3346   3.4 ------	UNKNOWN                       
100.7742  -4.1790    2.3  14.1 -168.0   1.5751   5.0 ------	UNKNOWN                       
147.9310 -54.8855    3.0  50.7  -17.4   2.5639   3.8 ------	UNKNOWN                       
111.1710  24.4769    3.1  43.7 -152.1   2.3110   3.8 ------	UNKNOWN

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

Time interval of the image:
-1.912000 51.896000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.7273  22.1267    3.9  44.0  171.1  -0.5478  -3.0    8.5	Crab                          
135.4737 -40.6142    8.9  36.7  -30.0  -0.1848  -1.3    4.4	Vela X-1                      
 73.5681 -48.8392    2.0  38.0   45.2   0.9491   5.8 ------	UNKNOWN                       
 74.5782   5.7411    2.2  35.8  144.7   0.7818   5.2 ------	UNKNOWN                       
 91.6570 -13.4112    2.3  10.7  130.7   0.4380   5.0 ------	UNKNOWN                       
143.0706 -18.6954    0.6  39.3  -67.4   6.4108  19.8 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
597.972600 962.596400
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
233.5758  16.7374    3.6  29.5   69.6   2.4699   3.2 ------	UNKNOWN                       
225.5883 -45.3769    2.5  53.9  166.9   7.3603   4.6 ------	UNKNOWN                       
216.2813  44.8047    2.0  40.4   15.8   3.8020   5.6 ------	UNKNOWN                       
211.8134  51.8055    2.7  46.6    9.4   2.7880   4.3 ------	UNKNOWN                       
179.7781 -31.9262    2.1  44.8 -144.2   5.3720   5.6 ------	UNKNOWN                       
162.7003  21.0607    2.6  44.4  -61.2  10.1545   4.4 ------	UNKNOWN

Plot creation:
Sat Oct 19 18:16:53 EDT 2024