batgrbproduct analysis for trigger=1212898

batgrbproduct Analysis for Trigger=1212898

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 Mar  9 13:59:16 EST 2024
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1212898
======================================================================

  Trigger: 01212898      Segment: 000

  BAT Trigger Time: 728752103.488   [s; MET]
      Trigger Stop: 728752104.512   [s; MET]
               UTC: 2024-02-04T15:07:50.633620    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 104.280141711717   Dec: 1.06112010114358  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    14.47
     Image Trigger?:     NO
     Rate S/N Ratio:     61.9031501621686  [ if not an image trigger ]
     Image S/N Ratio:    14.47

  Flight Position:   [ source = BAT ]
    RA: 104.280141711717   Dec: 1.06112010114358  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 104.287878858126   Dec: 1.07707317468475  [deg; J2000]  
        { 06h 57m 09.1s , +01d 04' 37.5" }
         +/- 1.26344102968527 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.646465511332091 [arcmin] (formal 1-sigma fit error)
    SNR: 21.7790956575972
 
  Angular difference between Flight and Ground position is 1.063784 arcmin
 
  Partial Coding Fraction: 0.09667969    [ including projection effects ]

  Duration
     T90: 16.3040000200272 +/- 1.85082043762432
        Measured from: -10.9919999837875
                   to: 5.31200003623962     [s; relative to TRIGTIME]
     T50: 3.74400007724762 +/- 0.337520358679582
        Measured from: -2.32000005245209
                   to: 1.42400002479553     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.0839999914169312     
                   to: 1.08399999141693     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -14.6560000181198     
                   to: 8.95999991893768     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     4.404325   6.281653   3.976075   0.746969
           0.153715   0.174934   0.146219   0.107242 [error]
 Peak      0.598722   0.959388   0.735921   0.139273
           0.045953   0.057174   0.050093   0.029432 [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 1.83e-06 2.79e-06 3.17e-06 6.90e-06 9.83e-06 1.47e-05   erg/cm2
              Error 1.12e-07 1.03e-07 1.48e-07 6.80e-07 3.60e-07 7.96e-07   erg/cm2
Peak flux Power-law 7.95e+00 7.23e+00 4.54e+00 4.35e+00 2.15e+01 2.41e+01   ph/cm2/s
              Error 8.26e-01 5.05e-01 3.76e-01 6.79e-01 1.48e+00 1.61e+00   ph/cm2/s
 
Fluence   Cutoff-PL 1.63e-06 2.93e-06 3.31e-06 3.35e-06 9.50e-06 1.12e-05   erg/cm2
              Error 1.37e-07 1.24e-07 1.66e-07 1.03e-06 3.91e-07 1.09e-06   erg/cm2
Peak flux Cutoff-PL 6.55e+00 8.16e+00 5.18e+00 1.76e+00 2.12e+01 2.16e+01   ph/cm2/s
              Error 9.82e-01 6.48e-01 4.85e-01 6.50e-01 1.50e+00 1.62e+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    1.811    0.062    -      -           4.52e-02 1.64e-03   62.560 57
CPL   1.228    0.274      67.7   12.1      8.76e-02 2.73e-02   47.620 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.672    0.101    -      -           1.64e-01 1.13e-02   66.850 57
CPL   0.540    0.491      66.2   10.6      6.11e-01 3.66e-01   47.600 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: 19.200000 sec.
T50 in the 50-300 keV band: 3.904000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   23.616  -14.656    8.960
T90    16.304  -10.992    5.312
T50     3.744   -2.320    1.424
Peak    1.000    0.084    1.084

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
  104.2879     1.0771   0.0088    43.9080   130.4633        16.5468550     21.779 TRIG_01212898                 
 
Foreground time interval of the image:
-14.656   8.960 (delta_t =  23.616 [sec])
Background time interval of the image:
-99.187 -14.656 (delta_t =  84.531 [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  -14.656 sec. to    8.960 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.81078     ( -0.0618978   0.0623897 )
Norm@50keV  : 4.51915E-02    ( -0.00163687   0.00163387 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   62.56     using 59 bins.
 Reduced chi-squared = 1.09754
# Null hypothesis probability of 2.86e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 23.62 sec: 6.25385 ( -0.24021  0.24087 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.82472e-06 ( -3.5995e-07  3.60727e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from  -14.656 sec. to    8.960 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.22809     ( -0.281937   0.265637 )
Epeak [keV] : 67.6972      ( -8.12842 16.1649 )
Norm@50keV  : 8.75511E-02    ( -0.0222998   0.0322389 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   47.62     using 59 bins.
 Reduced chi-squared = 0.850357
# Null hypothesis probability of 7.80e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 23.62 sec: 6.03942 ( -0.25598  0.25698 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.49708e-06 ( -3.91244e-07  3.90722e-07 ) ergs/cm2

Band function

Time interval is from  -14.656 sec. to    8.960 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]    : 13.5915  (  )
R^2/D10^2   : 0.933950  (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                  201.71     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 4.76e-18 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  8.628e-07   6.177e-08
25- 50  3.114e-06   1.287e-07
50-150  3.730e-06   2.504e-07
15-150  7.707e-06   2.752e-07

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 113.143       (-15.8364      15.1145)
Norm        : 26.4057       (-1.24742     1.64027)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   47.90     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 7.99e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.628e-06   1.161e-07
25- 50  2.882e-06   1.453e-07
50-150  4.993e-06   1.189e-06
15-150  9.502e-06   1.293e-06

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 7.00481        (-0.914516      0.975283)
R1^2/D10^2  : 6.85338        (-2.39291      4.32178)
kT2 [keV]   : 22.4882        (-2.51476      3.54813)
R2^2/D10^2  : 0.104024    (-0.0472081   0.0678921)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   51.65     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 6.04e-01 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.505e-06   1.749e-07
25- 50  2.970e-06   2.480e-07
50-150  4.899e-06   6.283e-07
15-150  9.373e-06   8.810e-07

Peak spectrum fit

Power-law model

Time interval is from    0.084 sec. to    1.084 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.67220     ( -0.0998458   0.10162 )
Norm@50keV  : 0.163778    ( -0.0113121   0.0112749 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   66.85     using 59 bins.
 Reduced chi-squared = 1.17281
# Null hypothesis probability of 1.75e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 21.5454 ( -1.4837  1.485 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.5202e-06 ( -1.08865e-07  1.09171e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from    0.084 sec. to    1.084 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.539888     ( -0.516287   0.466317 )
Epeak [keV] : 66.1516      ( -7.82397 13.308 )
Norm@50keV  : 0.610899    ( -0.250532   0.482363 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   47.60     using 59 bins.
 Reduced chi-squared = 0.85
# Null hypothesis probability of 7.80e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 21.1589 ( -1.4968  1.4979 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.48754e-06 ( -1.1163e-07  1.11908e-07 ) ergs/cm2

Band function

Time interval is from    0.084 sec. to    1.084 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]    : 14.5304  (-0.995503  1.05497)
R^2/D10^2   : 2.89818  (-0.660715   0.851402)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   78.30     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 3.21e-02 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.287e-07   1.415e-08
25- 50  4.964e-07   3.915e-08
50-150  7.029e-07   7.875e-08
15-150  1.328e-06   1.025e-07

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 143.138       (-32.198      44.0432)
Norm        : 90.9498       (-6.96895     8.04841)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   54.80     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 5.58e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.345e-07   2.090e-08
25- 50  4.316e-07   4.355e-08
50-150  8.353e-07   2.632e-07
15-150  1.501e-06   3.000e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 6.25266        (-1.61694      2.13289)
R1^2/D10^2  : 27.3683        (-16.2294      52.9844)
kT2 [keV]   : 19.3090        (-2.43715      4.08207)
R2^2/D10^2  : 0.816790    (-0.474545   0.80426)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   47.03     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 7.69e-01 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.100e-07   7.333e-08
25- 50  4.534e-07   1.079e-07
50-150  8.133e-07   1.892e-07
15-150  1.477e-06   3.384e-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: 1.81078     ( -0.0618978   0.0623897 )
Norm@50keV  : 4.51915E-02    ( -0.00163687   0.00163387 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   62.56     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 2.86e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 23.62 sec: 6.25347 ( -0.240138  0.240884 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.82327e-06 ( -3.6017e-07  3.60614e-07 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.22809     ( -0.281937   0.265637 )
Epeak [keV] : 67.6972      ( -8.12842 16.1649 )
Norm@50keV  : 8.75511E-02    ( -0.0222998   0.0322389 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   47.62     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 7.80e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 23.62 sec: 6.03844 ( -0.25586  0.25729 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.50011e-06 ( -3.91832e-07  3.90462e-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)  = 2.79e-06
S(50-100 keV) = 3.17e-06

T90 vs. Hardness ratio plot

T90                                   = 16.3040000200272 sec.
Hardness ratio (energy fluence ratio) = 1.1362

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.42625
Count Ratio (50-100 keV) / (15-25 keV) = 0.902766

Mask shadow pattern

IMX = -6.246842340291677E-01, IMY = -7.323611388375612E-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:
-99.187410 -14.656000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.7410  22.0885    0.6  16.9  153.5   3.6714  19.4    7.5	Crab                          
101.2645   3.4215    2.9  40.4  132.8   2.0682   4.0 ------	UNKNOWN

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

Time interval of the image:
-14.656000 8.960000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6162  21.8654    7.6  17.1  154.1  -0.1840  -1.5    9.0	Crab                          
104.2879   1.0771    0.5  43.9  130.5  16.5535  21.2 ------	UNKNOWN                       
129.4704  40.8221    2.9  38.2   58.2   1.8150   4.0 ------	UNKNOWN                       
108.7048  13.2557    2.8  36.3  114.1   1.5824   4.1 ------	UNKNOWN                       
167.9879  74.4306    2.6  52.8    7.8   1.6620   4.5 ------	UNKNOWN                       
 34.5840  17.3217    2.9  44.2 -117.7   1.2929   4.0 ------	UNKNOWN                       
 32.5594  23.0644    2.5  42.4 -109.3   1.4309   4.7 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
123.812590 962.643200
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6324  22.0247    0.6  28.9  -15.3  32.5288  20.9    0.6	Crab                          
135.5177 -40.5552    1.1  50.5  175.9  43.8975  11.0    0.5	Vela X-1                      
130.1627  20.7151    3.3  32.1   77.3  11.3498   3.5 ------	UNKNOWN                       
113.5369  22.8569    3.7  23.6   48.9   5.4606   3.1 ------	UNKNOWN                       
 80.8218  51.4536    2.3  54.1    9.1  25.4807   4.9 ------	UNKNOWN

Plot creation:
Sat Mar  9 15:15:23 EST 2024