batgrbproduct analysis for trigger=1219874

batgrbproduct Analysis for Trigger=1219874

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 13 13:35:35 EDT 2024
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/prebascript/trigger1219874/GCN5_download_cron
======================================================================

  Trigger: 01219874      Segment: 000

  BAT Trigger Time: 731969432   [s; MET]
      Trigger Stop: 731969496   [s; MET]
               UTC: 2024-03-12T20:49:58.925300    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 85.4739969270021   Dec: 21.0237073373362  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    9.13
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    9.13

  Flight Position:   [ source = BAT ]
    RA: 85.4739969270021   Dec: 21.0237073373362  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 85.4849595508144   Dec: 21.0183407961653  [deg; J2000]  
        { 05h 41m 56.4s , +21d 01' 06.0" }
         +/- 2.36074665316886 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.36617745438096 [arcmin] (formal 1-sigma fit error)
    SNR: 8.91642355449639
 
  Angular difference between Flight and Ground position is 0.693292 arcmin
 
  Partial Coding Fraction: 0.4023438    [ including projection effects ]

  Duration
     T90: 109.040000081062 +/- 83.4557184776113
        Measured from: 255.912000060081
                   to: 364.952000141144     [s; relative to TRIGTIME]
     T50: 109.040000081062 +/- 84.6425349571683
        Measured from: 255.912000060081
                   to: 364.952000141144     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 318.827999949455     
                   to: 319.827999949455     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 255.911999940872     
                   to: 364.952000021935     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.741278   0.777650   0.338516  -0.078269
           0.071709   0.075095   0.068152   0.070761 [error]
 Peak      0.024157   0.008421   0.011947   0.014156
           0.006936   0.007264   0.006564   0.006902 [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 2.81e-07 3.93e-07 4.08e-07 7.75e-07 1.33e-06 1.86e-06   erg/cm2
              Error 5.01e-08 4.81e-08 9.52e-08 3.68e-07 2.10e-07 4.66e-07   erg/cm2
Peak flux Power-law 1.43e-01 1.10e-01 5.72e-02 4.28e-02 3.30e-01 3.53e-01   ph/cm2/s
              Error 2.61e-02 1.33e-02 1.29e-02 1.89e-02 3.96e-02 4.37e-02   ph/cm2/s
 
Fluence   Cutoff-PL 2.79e-07 3.94e-07 4.06e-07 7.65e-07 1.33e-06 1.79e-06   erg/cm2
              Error 5.00e-08 4.87e-08 9.50e-08 5.95e-07 2.07e-07 5.38e-07   erg/cm2
Peak flux Cutoff-PL 1.45e-01 1.10e-01 5.59e-02 4.05e-02 3.30e-01 3.53e-01   ph/cm2/s
              Error 2.60e-02 1.35e-02 1.30e-02 2.46e-02 3.96e-02 4.43e-02   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    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 80.16 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  109.040  255.912  364.952
T90   109.040  255.912  364.952
T50   109.040  255.912  364.952
Peak    1.000  318.828  319.828

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
   85.4850 +21.0183 0.0217   30.2   96.7       2.8061     8.9  TRIG_01219874       
------------------------------------------
 
Foreground time interval of the image:
  0.000  64.000 (delta_t =  64.000 [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

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000

8 ms binning

From T100_start-3 s to T100_start+3 s

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000

2 ms binning

From T100_start-1 s to T100_start+1 s

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000

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
255.912000 267.909700
269.000000 296.220000
297.000000 364.952000
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
255.912000 267.909700
269.000000 296.220000
297.000000 364.952000
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
255.912000 267.909700
269.000000 296.220000
297.000000 364.952000
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  318.828 sec. to  319.828 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  318.828 sec. to  319.828 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  318.828 sec. to  319.828 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)  = 3.93e-07
S(50-100 keV) = 4.08e-07

T90 vs. Hardness ratio plot

T90                                   = 109.040000081062 sec.
Hardness ratio (energy fluence ratio) = 1.03817

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.04907
Count Ratio (50-100 keV) / (15-25 keV) = 0.456665

Mask shadow pattern

IMX = -6.822625179907024E-02, IMY = -5.778592322057930E-01

TIME vs. PHA plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000

TIME vs. DetID plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000

100 us light curve (15-350 keV)

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000

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:
-119.000000 70.300600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6675  22.0816    4.5  28.5   94.7   2.1846   2.6    4.5	Crab                          
 88.8867   6.0031    2.2  37.4  121.5   6.2507   5.2 ------	UNKNOWN                       
 85.4717  21.0485    1.8  30.2   96.7   5.5223   6.4 ------	UNKNOWN                       
 79.3119  47.3327    3.1  34.6   46.1   3.3453   3.8 ------	UNKNOWN                       
 47.4202  62.8199    4.1  43.0   10.5   2.4061   2.9 ------	UNKNOWN                       
 22.4349  21.6976    2.9  28.8  -66.8   3.2555   4.0 ------	UNKNOWN

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

Time interval of the image:
0.000000 64.000000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6517  22.0170    3.6  28.4   94.9   1.0551   3.2    1.0	Crab                          
 85.4850  21.0183    1.3  30.2   96.7   2.8061   9.0 ------	UNKNOWN                       
 83.9434  34.2830    2.2  30.7   70.2   1.6512   5.1 ------	UNKNOWN                       
 31.1457  27.2342    2.7  21.4  -51.7   0.9353   4.3 ------	UNKNOWN                       
 56.0582 -37.8681    2.2  57.9 -168.3   5.1793   5.2 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
138.500600 267.909700
269.000000 296.220000
297.000000 534.540000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.7521  22.1597    7.5   2.0  -52.6   1.2421   1.5   10.9	Crab                          
121.3746  13.9213    2.5  34.9   97.9   7.1910   4.6 ------	UNKNOWN                       
 98.1485  63.3403    4.1  43.2   10.4   3.5353   2.8 ------	UNKNOWN                       
 85.7149  20.9943    0.6   0.2  102.1  14.9697  18.8 ------	UNKNOWN                       
 80.3618  34.2783    2.3  14.0  -15.7   4.1171   5.0 ------	UNKNOWN

Plot creation:
Wed Mar 13 13:37:01 EDT 2024