batgrbproduct analysis for trigger=1267921

batgrbproduct Analysis for Trigger=1267921

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 Dec 18 16:25:35 EST 2024
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1267921
======================================================================

  Trigger: 01267921      Segment: 000

  BAT Trigger Time: 753369539.584   [s; MET]
      Trigger Stop: 753369540.096   [s; MET]
               UTC: 2024-11-15T13:18:25.044040    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 86.7650821753851   Dec: -0.662559979951746  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    18.15
     Image Trigger?:     NO
     Rate S/N Ratio:     61.8304132284428  [ if not an image trigger ]
     Image S/N Ratio:    18.15

  Flight Position:   [ source = BAT ]
    RA: 86.7650821753851   Dec: -0.662559979951746  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 86.7712550200047   Dec: -0.665730132542879  [deg; J2000]  
        { 05h 47m 05.1s , -00d 39' 56.6" }
         +/- 0.900158610442437 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.356436077251799 [arcmin] (formal 1-sigma fit error)
    SNR: 35.3489806091933
 
  Angular difference between Flight and Ground position is 0.416336 arcmin
 
  Partial Coding Fraction: 0.78125    [ including projection effects ]

  Duration
     T90: 3.69999992847443 +/- 2.92357662972066
        Measured from: -0.248000025749207
                   to: 3.45199990272522     [s; relative to TRIGTIME]
     T50: 1.32399988174438 +/- 0.120929728318914
        Measured from: 0.320000052452087
                   to: 1.64399993419647     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.472000002861023     
                   to: 1.47200000286102     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.472000002861023     
                   to: 9.29200005531311     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.429788   0.683554   0.454594   0.074653
           0.022269   0.024484   0.020921   0.015615 [error]
 Peak      0.155575   0.289749   0.180414   0.030123
           0.009128   0.011127   0.009250   0.005855 [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 1.49e-07 2.62e-07 3.52e-07 9.72e-07 1.03e-06 1.74e-06   erg/cm2
              Error 1.10e-08 1.20e-08 2.06e-08 1.20e-07 4.98e-08 1.36e-07   erg/cm2
Peak flux Power-law 1.83e+00 1.78e+00 1.22e+00 1.30e+00 5.35e+00 6.13e+00   ph/cm2/s
              Error 1.41e-01 9.06e-02 7.39e-02 1.52e-01 2.64e-01 3.00e-01   ph/cm2/s
 
Fluence   Cutoff-PL 1.30e-07 2.85e-07 3.65e-07 3.16e-07 9.57e-07 1.09e-06   erg/cm2
              Error 1.32e-08 1.54e-08 2.32e-08 1.29e-07 5.60e-08 1.38e-07   erg/cm2
Peak flux Cutoff-PL 1.45e+00 2.06e+00 1.35e+00 3.66e-01 5.14e+00 5.22e+00   ph/cm2/s
              Error 1.66e-01 1.21e-01 9.10e-02 1.21e-01 2.70e-01 2.92e-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    1.574    0.076    -      -           1.12e-02 5.05e-04   56.620 57
CPL   0.713    0.362      73.0   13.7      3.08e-02 1.35e-02   36.500 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.552    0.076    -      -           4.23e-02 2.11e-03   96.950 57
CPL   0.107    0.417      63.6    6.6      2.37e-01 1.25e-01   47.930 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: 2.240000 sec.
T50 in the 50-300 keV band: 1.088000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100    9.764   -0.472    9.292
T90     3.700   -0.248    3.452
T50     1.324    0.320    1.644
Peak    1.000    0.472    1.472

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
   86.7713    -0.6657   0.0054    20.8755   136.5733         1.6439127     35.349 TRIG_01267921                 
 
Foreground time interval of the image:
 -0.472   9.292 (delta_t =   9.764 [sec])
Background time interval of the image:
-239.584  -0.472 (delta_t = 239.112 [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   -0.472 sec. to    9.292 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.57397     ( -0.0753757   0.0758454 )
Norm@50keV  : 1.11646E-02    ( -0.000505222   0.000504026 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   56.62     using 59 bins.
 Reduced chi-squared = 0.993333
# Null hypothesis probability of 4.89e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 9.764 sec: 1.42342 ( -0.06437  0.06445 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.023e-06 ( -4.96564e-08  4.98681e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.472 sec. to    9.292 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.712840     ( -0.377886   0.347071 )
Epeak [keV] : 73.0320      ( -9.43604 18.0254 )
Norm@50keV  : 3.07548E-02    ( -0.0101361   0.0168979 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   36.50     using 59 bins.
 Reduced chi-squared = 0.651786
# Null hypothesis probability of 9.80e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 9.764 sec: 1.36630 ( -0.06799  0.06802 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.56727e-07 ( -5.58241e-08  5.61296e-08 ) ergs/cm2

Band function

Time interval is from   -0.472 sec. to    9.292 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]    : 14.0753  (-0.709765  0.755336)
R^2/D10^2   : 0.201735  (-0.0348303   0.0415419)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   98.83     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 4.95e-04 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  8.239e-08   6.674e-09
25- 50  3.081e-07   1.562e-08
50-150  4.030e-07   3.705e-08
15-150  7.934e-07   4.135e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 176.441       (-35.5344      -176.356)
Norm        : 5.84931       (-0.28022     0.298475)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   43.55     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 9.05e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.444e-07   9.227e-09
25- 50  2.736e-07   2.861e-08
50-150  5.751e-07   1.848e-07
15-150  9.930e-07   2.193e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 8.09412        (-1.70517      1.79067)
R1^2/D10^2  : 0.859375        (-0.351224      0.837327)
kT2 [keV]   : 23.9920        (-4.50305      9.58894)
R2^2/D10^2  : 2.07899E-02    (-0.0150891   0.0289769)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   37.43     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 9.66e-01 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.210e-07   1.886e-08
25- 50  2.942e-07   4.189e-08
50-150  5.427e-07   1.939e-07
15-150  9.578e-07   1.881e-07

Peak spectrum fit

Power-law model

Time interval is from    0.472 sec. to    1.472 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.55219     ( -0.0752759   0.075919 )
Norm@50keV  : 4.22709E-02    ( -0.00210958   0.00210506 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   96.95     using 59 bins.
 Reduced chi-squared = 1.70088
# Null hypothesis probability of 7.62e-04 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 5.35478 ( -0.26384  0.264 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.97878e-07 ( -2.12349e-08  2.13111e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    0.472 sec. to    1.472 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.107495     ( -0.43838   0.396238 )
Epeak [keV] : 63.5609      ( -5.51903 7.74144 )
Norm@50keV  : 0.236986    ( -0.0882412   0.160947 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   47.93     using 59 bins.
 Reduced chi-squared = 0.855893
# Null hypothesis probability of 7.70e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 5.14442 ( -0.26952  0.2697 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.66817e-07 ( -2.2689e-08  2.29096e-08 ) ergs/cm2

Band function

Time interval is from    0.472 sec. to    1.472 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]    : 14.0227  (-0.698633  0.741552)
R^2/D10^2   : 0.819936  (-0.140133   0.166293)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   77.28     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 3.82e-02 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.405e-08   2.930e-09
25- 50  1.269e-07   6.600e-09
50-150  1.644e-07   1.610e-08
15-150  3.253e-07   1.950e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 176.875       (-35.6167      -176.771)
Norm        : 22.2925       (-1.14843     1.20055)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   75.42     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 5.17e-02 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  5.633e-08   3.970e-09
25- 50  1.068e-07   1.330e-08
50-150  2.247e-07   7.183e-08
15-150  3.878e-07   8.025e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 9.48369        (-1.93862      1.79188)
R1^2/D10^2  : 2.02616        (-0.667826      1.39973)
kT2 [keV]   : 24.1099        (-5.13994      11.5315)
R2^2/D10^2  : 6.82827E-02    (-0.0545575   0.135894)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   44.73     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 8.37e-01 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.339e-08   7.970e-09
25- 50  1.228e-07   2.431e-08
50-150  2.067e-07   7.564e-08
15-150  3.730e-07   1.007e-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: 1.57397     ( -0.0753757   0.0758454 )
Norm@50keV  : 1.11646E-02    ( -0.000505222   0.000504026 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   56.62     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 4.89e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 9.764 sec: 1.42338 ( -0.0643668  0.0644409 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.02286e-06 ( -4.96595e-08  4.98642e-08 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.712840     ( -0.377887   0.34707 )
Epeak [keV] : 73.0321      ( -9.43607 18.0253 )
Norm@50keV  : 3.07548E-02    ( -0.010136   0.016898 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   36.50     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 9.80e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 9.764 sec: 1.36615 ( -0.06797  0.068 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.57058e-07 ( -5.58803e-08  5.61723e-08 ) 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)  = 2.62e-07
S(50-100 keV) = 3.52e-07

T90 vs. Hardness ratio plot

T90                                   = 3.69999992847443 sec.
Hardness ratio (energy fluence ratio) = 1.34351

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.59044
Count Ratio (50-100 keV) / (15-25 keV) = 1.05772

Mask shadow pattern

IMX = -2.769737525344806E-01, IMY = -2.621660003891960E-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:
-239.584000 -0.472000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6024  22.0321    2.3  42.7  122.5   8.0253   5.0    2.0	Crab                          
138.5195  -4.8568    2.6  58.7 -159.1   9.1354   4.3 ------	UNKNOWN

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

Time interval of the image:
-0.472000 9.292000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.5964  21.8526    0.0  42.5  122.5  -0.1113  -0.6    9.9	Crab                          
 86.7712  -0.6657    0.3  20.9  136.6   1.6438  35.3 ------	UNKNOWN                       
130.7641   0.3887    2.2  53.7 -168.7   0.6362   5.3 ------	UNKNOWN                       
129.8009 -35.1212    2.7  45.7 -122.6   0.7414   4.4 ------	UNKNOWN                       
132.7786 -30.5116    2.8  48.0 -129.0   0.6564   4.1 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
91.316600 99.755100
100.416000 962.456000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6349  22.0225    0.4  22.9  141.8  35.7807  25.7    0.5	Crab                          
 56.0048   0.5789    2.8  30.8   61.5   8.9820   4.1 ------	UNKNOWN                       
 49.0340 -35.8737    2.9  49.6    9.9   7.4149   4.0 ------	UNKNOWN                       
 57.4677 -30.8473    3.4  41.0    9.1   5.3574   3.4 ------	UNKNOWN                       
123.1835  32.8830    3.2  48.0 -168.6   8.9987   3.6 ------	UNKNOWN                       
 63.6033 -48.6464    3.9  52.0  -11.5   6.8481   2.9 ------	UNKNOWN                       
134.4388   5.7592    3.0  48.0 -129.1  22.2157   3.9 ------	UNKNOWN

Plot creation:
Wed Dec 18 17:40:55 EST 2024