batgrbproduct analysis for trigger=1218903

batgrbproduct Analysis for Trigger=1218903

Analysis Summary

Notes:

1) No attempt has been made to eliminate the non-significant decimal places.
2) This batgrbproduct analysis is done of the amount of data for this trigger downloaded to date.
3) This batgrbproduct analysis is using the flight position for the mask-weighting calculation.
4) This page will be updated for up to 15 downlinks after the trigger.

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.48
    Process Start Time (local time): Wed Mar  6 21:18:35 EST 2024
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/prebascript/trigger1218903/GCN5_download_cron
======================================================================

  Trigger: 01218903      Segment: 000

  BAT Trigger Time: 731380240   [s; MET]
      Trigger Stop: 731380304   [s; MET]
               UTC: 2024-03-06T01:10:06.965660    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 299.233694631944   Dec: 35.427101328007  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.59
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    8.59

  Flight Position:   [ source = BAT ]
    RA: 299.233694631944   Dec: 35.427101328007  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 299.240795005808   Dec: 35.4118250760587  [deg; J2000]  
        { 19h 56m 57.8s , +35d 24' 42.6" }
         +/- 2.8729550505094 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.41342727625571 [arcmin] (formal 1-sigma fit error)
    SNR: 6.73539246703129
 
  Angular difference between Flight and Ground position is 0.980124 arcmin
 
  Partial Coding Fraction: 0.4570312    [ including projection effects ]

  Duration
     T90: 6.65599989891052 +/- 3.19337130559698
        Measured from: 79.172000169754
                   to: 85.8280000686646     [s; relative to TRIGTIME]
     T50: 4.46399998664856 +/- 2.79553711764291
        Measured from: 79.7600001096725
                   to: 84.2240000963211     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 81.6599999666214     
                   to: 82.6599999666214     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 75.3240000009537     
                   to: 86.1119999885559     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.050822   0.144512   0.041618  -0.011898
           0.036155   0.034799   0.028790   0.026467 [error]
 Peak      0.033254   0.020764  -0.000255   0.012612
           0.011481   0.011816   0.009270   0.008669 [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 6.93e-08 1.28e-07 1.83e-07 5.48e-07 5.21e-07 9.29e-07   erg/cm2
              Error 2.21e-08 2.57e-08 4.02e-08 2.58e-07 1.01e-07 2.86e-07   erg/cm2
Peak flux Power-law 1.06e-01 1.07e-01 7.62e-02 8.65e-02 3.23e-01 3.75e-01   ph/cm2/s
              Error 3.43e-02 2.20e-02 1.63e-02 3.74e-02 6.23e-02 6.85e-02   ph/cm2/s
 
Fluence   Cutoff-PL 5.26e-08 1.44e-07 1.99e-07 1.24e-07 4.79e-07 5.20e-07   erg/cm2
              Error 2.64e-08 3.21e-08 4.87e-08 2.50e-07 1.07e-07 2.56e-07   erg/cm2
Peak flux Cutoff-PL 7.86e-02 1.18e-01 8.50e-02 2.71e-02 3.02e-01 3.09e-01   ph/cm2/s
              Error 4.08e-02 2.67e-02 2.01e-02 4.12e-02 6.51e-02 7.41e-02   ph/cm2/s
 
Fluence        Band 5.16e-08 1.44e-07 1.97e-07 1.91e-07 4.80e-07 5.87e-07   erg/cm2
              Error -------- 3.66e-08 -------- 3.36e-07 -------- --------   erg/cm2
Peak flux      Band 7.80e-02 1.19e-01 8.45e-02 3.57e-02 3.02e-01 3.17e-01   ph/cm2/s
              Error -------- 3.17e-02 -------- -------- 6.48e-02 --------   ph/cm2/s

 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    0.000    0.000    -      -           0.00e+00 0.00e+00    0.000  0
CPL   0.000    0.000       0.0    0.0      0.00e+00 0.00e+00    0.000  0
 
The chi2 of BB fit is 52.21 which shows a significant improvement in the fit over a PL.
Check the BB fit.
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    0.000    0.000    -      -           0.00e+00 0.00e+00    0.000  0
CPL   0.000    0.000       0.0    0.0      0.00e+00 0.00e+00    0.000  0
 
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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   10.788   75.324   86.112
T90     6.656   79.172   85.828
T50     4.464   79.760   84.224
Peak    1.000   81.660   82.660

Click here for the BAT GCN circular template

Estimated redshift from machine learning (Ukwatta et al. 2016) - may take a few minutes to calcaulte

Image

Pre-slew 15-350 keV image (Event data; bkg subtracted)

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
  299.2408 +35.4118 0.0285   43.2 -161.5       0.8278     6.7  TRIG_01218903       
------------------------------------------
 
Foreground time interval of the image:
  0.000  21.140 (delta_t =  21.140 [sec])
Background time interval of the image:

Lightcurves

Notes:

1) All plots contain as much data as has been downloaded to date.
2) The mask-weighted light curves are using the flight position.
3) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
4) 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.
5) 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.
6) 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)

Spectra

Notes:

1) The fitting includes the systematic errors.
2) For long bursts, a spectral fit of 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.
4) For short bursts (T90<1sec), the specrtum is also fit with Blackbody, OTTB, and Double Blackbody.

Time averaged spectrum fit using the pre-slew DRM

Power-law model

Multiple GTIs in the spectrum
tstart tstop
75.324000 77.500000
79.000000 86.112000
Usage: bat_spec_fit_sys_xspec12.sh (pha file) (response file) (script folder) (folder of taka's xspec lmodel)
       This script tries to add the systematic column to the PHA
       file before doing the fitting                            
script folder: /local/data/BATtools/battools/bin/GRB_spec_fit_v2
folder of taka's xspec lmodel: /local/data/bat1/prebascript/xspec_taka_lmodel

Cutoff power-law model

Multiple GTIs in the spectrum
tstart tstop
75.324000 77.500000
79.000000 86.112000
Usage: bat_spec_fit_cutoff_sys_xspec12.sh (pha file) (response file) (script folder) (folder of taka's xspec lmodel)
       This script tries to add the systematic column to the PHA
       file before doing the fitting                            
script folder: /local/data/bat2/BATtools/battools/bin/GRB_spec_fit_v2
folder of taka's xspec lmodel: /local/data/bat1/prebascript/xspec_taka_lmodel

Band function

Multiple GTIs in the spectrum
tstart tstop
75.324000 77.500000
79.000000 86.112000
Usage: bat_spec_fit_band_sys.sh (pha file) (response file) (script folder) (folder of taka's xspec lmodel)
       This script tries to add the systematic column to the PHA
       file before doing the fitting                            
script folder: /local/data/bat2/BATtools/battools/bin/GRB_spec_fit_v2
folder of taka's xspec lmodel: /local/data/bat1/prebascript/xspec_taka_lmodel

Single BB

Usage: bat_spec_fit_bb_sys.sh (pha file) (response file)           
       This script tries to add the systematic column to the PHA
       file before doing the fitting

Thermal bremsstrahlung (OTTB)

Usage: bat_spec_fit_brems_sys.sh (pha file) (response file)           
       This script tries to add the systematic column to the PHA
       file before doing the fitting

Double BB

Usage: bat_spec_fit_2bb_sys.sh (pha file) (response file)           
       This script tries to add the systematic column to the PHA
       file before doing the fitting

Peak spectrum fit

Power-law model

Time interval is from   81.660 sec. to   82.660 sec.
Usage: bat_spec_fit_sys_xspec12.sh (pha file) (response file) (script folder) (folder of taka's xspec lmodel)
       This script tries to add the systematic column to the PHA
       file before doing the fitting                            
script folder: /local/data/BATtools/battools/bin/GRB_spec_fit_v2
folder of taka's xspec lmodel: /local/data/bat1/prebascript/xspec_taka_lmodel

Cutoff power-law model

Time interval is from   81.660 sec. to   82.660 sec.
Usage: bat_spec_fit_cutoff_sys_xspec12.sh (pha file) (response file) (script folder) (folder of taka's xspec lmodel)
       This script tries to add the systematic column to the PHA
       file before doing the fitting                            
script folder: /local/data/bat2/BATtools/battools/bin/GRB_spec_fit_v2
folder of taka's xspec lmodel: /local/data/bat1/prebascript/xspec_taka_lmodel

Band function

Time interval is from   81.660 sec. to   82.660 sec.
Usage: bat_spec_fit_band_sys.sh (pha file) (response file) (script folder) (folder of taka's xspec lmodel)
       This script tries to add the systematic column to the PHA
       file before doing the fitting                            
script folder: /local/data/bat2/BATtools/battools/bin/GRB_spec_fit_v2
folder of taka's xspec lmodel: /local/data/bat1/prebascript/xspec_taka_lmodel

Single BB

Usage: bat_spec_fit_bb_sys.sh (pha file) (response file)           
       This script tries to add the systematic column to the PHA
       file before doing the fitting

Thermal bremsstrahlung (OTTB)

Usage: bat_spec_fit_brems_sys.sh (pha file) (response file)           
       This script tries to add the systematic column to the PHA
       file before doing the fitting

Double BB

Usage: bat_spec_fit_2bb_sys.sh (pha file) (response file)           
       This script tries to add the systematic column to the PHA
       file before doing the fitting

Pre-slew spectrum (Pre-slew PHA with pre-slew DRM)

Power-law model

Cutoff power-law model

Band function

S(25-50 keV) vs. S(50-100 keV) plot

S(25-50 keV)  = 1.28e-07
S(50-100 keV) = 1.83e-07

T90 vs. Hardness ratio plot

T90                                   = 6.65599989891052 sec.
Hardness ratio (energy fluence ratio) = 1.42969

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 2.84349
Count Ratio (50-100 keV) / (15-25 keV) = 0.818897

Mask shadow pattern

IMX = -8.894240067425627E-01, IMY = 2.969458613156292E-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:
-15.999400 21.140000
22.000000 72.300600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
244.8709 -15.6545    0.8  34.6   58.0   5.6305  13.8    6.3	Sco X-1                       
254.3280  35.2644    5.9  43.6  144.5   1.1395   2.0    7.9	Her X-1                       
255.9241 -37.7956   63.0  40.3   18.7   0.0587   0.2    4.2	4U 1700-377                   
256.4161 -36.5399    4.7  39.1   19.3  -0.8148  -2.5    7.1	GX 349+2                      
262.8874 -24.5672    0.0  26.1   23.4   0.0424   0.2   12.6	GX 1+4                        
264.8850 -44.5014    8.5  43.3    5.2   0.4287   1.4    6.8	4U 1735-44                    
268.2405  -1.2848    0.0   9.3   90.2   0.2571   1.4   12.6	SW J1753.5-0127               
270.2737 -24.9253   14.3  23.4    8.7  -0.1606  -0.8    9.2	GX 5-1                        
270.3222 -25.6291    3.6  24.0    8.0   0.6310   3.2    6.9	GRS 1758-258                  
273.8781 -13.8662    0.0  11.8    9.2   0.5211   2.9   12.6	GX 17+2                       
275.9248 -30.3720   55.6  27.8   -5.1  -0.0432  -0.2    0.3	H1820-303                     
285.1498 -24.7800 1897.4  23.4  -25.8   0.0011   0.0   10.5	HT1900.1-2455                 
288.6583  10.9911    2.0  17.6 -148.6  -1.0448  -5.7    8.7	GRS 1915+105                  
299.4693  35.3170    6.5  43.2 -161.2   0.5709   1.8    9.1	Cyg X-1                       
308.1084  41.0199    4.5  51.8 -158.5   1.3285   2.5    4.0	Cyg X-3                       
263.0016 -33.8182    4.2  34.0   13.9   0.7451   2.8    1.2	GX 354-0                      
270.6553  51.0555    2.3  54.0  166.9   3.9474   5.0 ------	UNKNOWN                       
257.8122 -42.3859    2.7  43.5   13.3   1.5205   4.3 ------	UNKNOWN

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

Time interval of the image:
0.000000 21.140000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
244.8809 -15.6584    1.5  34.6   58.0   1.3287   7.9    5.8	Sco X-1                       
254.5147  35.2097    6.8  43.5  144.6  -0.3545  -1.7    8.4	Her X-1                       
256.0951 -38.0313    0.0  40.4   18.4  -0.0679  -0.6   12.3	4U 1700-377                   
256.3894 -36.5248    4.8  39.1   19.4  -0.3007  -2.4    6.5	GX 349+2                      
262.8673 -24.7590   15.9  26.2   23.2   0.0616   0.7    7.8	GX 1+4                        
264.8503 -44.6248    0.0  43.5    5.2   0.2542   2.0   11.5	4U 1735-44                    
268.4728  -1.6173    4.7   9.0   88.3  -0.1841  -2.4   11.7	SW J1753.5-0127               
270.1598 -24.9065    0.0  23.4    8.9  -0.1037  -1.2   12.4	GX 5-1                        
270.2627 -25.5906    2.4  24.0    8.2   0.3863   4.8    9.4	GRS 1758-258                  
273.9238 -13.8729   14.5  11.8    9.0   0.0592   0.8   10.9	GX 17+2                       
275.7705 -30.4178  843.0  27.9   -4.8   0.0011   0.0    8.6	H1820-303                     
285.1676 -25.0771    0.0  23.7  -25.6  -0.1052  -1.2   11.8	HT1900.1-2455                 
288.6380  10.8598    7.4  17.5 -148.3  -0.1148  -1.6   10.8	GRS 1915+105                  
299.4577  35.2520   23.1  43.1 -161.2   0.0609   0.5    7.2	Cyg X-1                       
308.1623  40.9384   16.6  51.8 -158.4   0.1998   0.7    2.5	Cyg X-3                       
262.9831 -33.7863    5.9  34.0   13.9   0.2001   2.0    2.9	GX 354-0                      
250.6412  42.3641    2.8  51.1  146.8   1.5785   4.2 ------	UNKNOWN                       
270.6903  37.2360    2.3  40.3  163.9   0.6629   5.0 ------	UNKNOWN                       
282.5395  -2.3931    2.7   5.1 -100.1   0.3018   4.3 ------	UNKNOWN                       
310.5224 -45.0276    2.1  51.4  -37.4   1.5367   5.5 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
162.200600 243.050000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4452  35.2181    5.6  36.2   71.0  -0.9431  -2.1    7.5	Her X-1                       
268.3701  -1.3293   28.6  46.7   12.7  -0.1304  -0.4    7.4	SW J1753.5-0127               
274.0413 -13.9416    6.1  54.8   -1.7   1.0344   1.9    6.0	GX 17+2                       
288.9033  10.9636    6.6  26.2   -8.6  -0.3032  -1.7    6.3	GRS 1915+105                  
299.4777  35.3370    1.0   0.2 -101.1   1.7580  11.4    9.8	Cyg X-1                       
307.8662  40.9556    5.9   8.8 -163.9  -0.3054  -2.0   11.1	Cyg X-3                       
326.1804  38.3729    5.0  21.7 -137.9   0.4053   2.3    3.1	Cyg X-2                       
275.1097  -5.5848    3.2  46.9    1.8   1.1401   3.7 ------	UNKNOWN                       
299.3893 -19.7669    1.9  55.2  -32.3   5.8295   6.2 ------	UNKNOWN                       
339.3831  15.3626    2.9  41.0 -103.3   3.0457   4.0 ------	UNKNOWN

Plot creation:
Wed Mar  6 21:19:38 EST 2024