batgrbproduct analysis for trigger=846740

batgrbproduct Analysis for Trigger=846740

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 v2.46
    Process Start Time (local time): Mon Jul  9 12:17:48 EDT 2018
             Host Name: bat1
   Current Working Dir: /local/data/bat1/prebascript/trigger846740/GCN5_download_cron
======================================================================

  Trigger: 00846740      Segment: 000

  BAT Trigger Time: 552749640   [s; MET]
      Trigger Stop: 552749728   [s; MET]
               UTC: 2018-07-08T13:33:38.769060    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 198.918909891462   Dec: 41.8972108811188  [deg; J2000]

     Catalogged Source?: YES
     Point Source?:      YES
     GRB Indicated?:     NO    [ by BAT flight software ]
     Image S/N Ratio:    5.93
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    5.93

  Flight Position:   [ source = BAT ]
    RA: 198.918909891462   Dec: 41.8972108811188  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 198.900945930262   Dec: 41.8738272304255  [deg; J2000]  
        { 13h 15m 36.2s , +41d 52' 25.8" }
         +/- 4.14277473743776 [arcmin] (estimated 90% radius based on SNR)
         +/- 2.45642827693538 [arcmin] (formal 1-sigma fit error)
    SNR: 3.99276397278939
 
  Angular difference between Flight and Ground position is 1.616278 arcmin
 
  Partial Coding Fraction: 0.3671875    [ including projection effects ]

  Duration
     T90: 1.15199983119965 +/- 0.0640000104904175
        Measured from: 140.904000163078
                   to: 142.055999994278     [s; relative to TRIGTIME]
     T50: 0.575999975204468 +/- 0.064
        Measured from: 141.09600007534
                   to: 141.672000050545     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 141.427999973297     
                   to: 142.427999973297     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 140.840000033379     
                   to: 142.120000004768     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total    -0.020253  -0.009096  -0.023845  -0.007887
           0.006186   0.006425   0.005738   0.005234 [error]
 Peak     -0.007554  -0.001785  -0.012029  -0.001991
           0.005431   0.005616   0.004962   0.004552 [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 1.05e-07 1.28e-07 1.14e-07 1.74e-07 4.07e-07 5.21e-07   erg/cm2
              Error 4.41e-08 4.69e-08 7.00e-08 2.36e-07 1.72e-07 3.10e-07   erg/cm2
Peak flux Power-law 3.89e-02 2.64e-02 1.17e-02 7.21e-03 8.05e-02 8.41e-02   ph/cm2/s
              Error 1.67e-02 9.48e-03 6.99e-03 9.10e-03 2.80e-02 2.96e-02   ph/cm2/s
 
Fluence   Cutoff-PL 1.05e-07 1.73e-07 1.29e-08 3.25e-12 2.91e-07 2.91e-07   erg/cm2
              Error 5.26e-08 7.62e-08 5.01e-08 8.21e-09 1.08e-07 1.08e-07   erg/cm2
Peak flux Cutoff-PL 3.71e-02 3.74e-02 1.63e-03 2.17e-07 7.61e-02 7.61e-02   ph/cm2/s
              Error 1.95e-02 1.14e-02 5.50e-03 4.79e-04 2.54e-02 2.54e-02   ph/cm2/s
 
Fluence        Band 1.05e-07 1.74e-07 3.08e-08 3.13e-09 3.14e-07 3.13e-07   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 67.73 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    1.280  140.840  142.120
T90     1.152  140.904  142.056
T50     0.576  141.096  141.672
Peak    1.000  141.428  142.428

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
  198.9009 +41.8738 0.0481   38.4 -132.1       0.8735     4.0  TRIG_00846740       
------------------------------------------
 
Foreground time interval of the image:
  0.000  88.000 (delta_t =  88.000 [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 88.000000

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 88.000000

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 88.000000

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

Time interval is from  140.840 sec. to  142.120 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  140.840 sec. to  142.120 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  140.840 sec. to  142.120 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

Peak spectrum fit

Power-law model

Time interval is from  141.428 sec. to  142.428 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  141.428 sec. to  142.428 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  141.428 sec. to  142.428 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) = 1.14e-07

T90 vs. Hardness ratio plot

T90                                   = 1.15199983119965 sec.
Hardness ratio (energy fluence ratio) = 0.890625

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 0.449119
Count Ratio (50-100 keV) / (15-25 keV) = 1.17736

Mask shadow pattern

IMX = -5.305407828529695E-01, IMY = 5.870293823989103E-01

TIME vs. PHA plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 88.000000

TIME vs. DetID plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 88.000000

100 us light curve (15-350 keV)

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 88.000000

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:
-239.000000 97.100590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.3918  35.3893    3.5  10.1  115.5   1.0438   3.3    4.3	Her X-1                       
299.5645  35.1311    1.9  36.6   32.9   3.0624   5.9    4.4	Cyg X-1                       
308.2776  40.8312    0.0  40.0   19.5  -0.8811  -1.6   10.5	Cyg X-3                       
326.3625  38.3867   13.8  53.3   13.1   1.0773   0.8    9.8	Cyg X-2                       
259.4262   4.2664    2.2  41.6  113.3   6.1382   5.3 ------	UNKNOWN                       
292.7738  26.4301    2.1  37.1   50.4   3.4364   5.4 ------	UNKNOWN                       
286.5188  27.5916    2.9  32.2   55.4   1.9039   3.9 ------	UNKNOWN                       
319.7325  54.2805    3.2  42.4   -3.7   1.8852   3.6 ------	UNKNOWN                       
195.7610  17.1429    2.7  54.8 -158.2   6.2025   4.2 ------	UNKNOWN                       
186.3281  39.2944    3.5  48.0 -129.1   5.7279   3.3 ------	UNKNOWN

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

Time interval of the image:
0.000000 88.000000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4407  35.5101  123.2  10.0  115.2   0.0113   0.1   10.1	Her X-1                       
299.6046  35.1619    3.5  36.7   32.8   0.6419   3.3    2.5	Cyg X-1                       
308.1054  40.9502   36.5  39.8   19.5  -0.0613  -0.3    0.3	Cyg X-3                       
326.1779  38.3193 1483.8  53.3   13.2  -0.0035  -0.0    0.3	Cyg X-2                       
275.8838  55.8842    2.6  17.9  -10.6   0.4774   4.5 ------	UNKNOWN                       
233.3742  41.7829    2.2  14.4 -154.4   0.5712   5.2 ------	UNKNOWN                       
174.6201  84.6651    3.1  43.7  -64.1   2.1616   3.8 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
153.300600 410.310000
411.000000 604.600610
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
267.2727  67.4971    3.1  43.8   13.3   2.4173   3.8 ------	UNKNOWN                       
162.2217  56.3795    3.8  27.6  -63.3   1.5494   3.0 ------	UNKNOWN                       
 16.2548  78.6185    3.2  59.5  -17.0   9.3508   3.6 ------	UNKNOWN

Plot creation:
Mon Jul  9 12:20:46 EDT 2018