batgrbproduct analysis for trigger=818110

batgrbproduct Analysis for Trigger=818110

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): Tue Mar 27 16:21:30 EDT 2018
             Host Name: bat1
   Current Working Dir: /local/data/bat1/prebascript/trigger818110/GCN5_download_cron
======================================================================

  Trigger: 00818110      Segment: 000

  BAT Trigger Time: 543774128   [s; MET]
      Trigger Stop: 543774192   [s; MET]
               UTC: 2018-03-26T16:21:47.314100    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 135.500959013233   Dec: -40.7600658019718  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.53
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    7.53

  Flight Position:   [ source = BAT ]
    RA: 135.500959013233   Dec: -40.7600658019718  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 135.465901402821   Dec: -40.634263019052  [deg; J2000]  
        { 09h 01m 51.8s , -40d 38' 03.3" }
         +/- 4.21672758432511 [arcmin] (estimated 90% radius based on SNR)
         +/- 2.50506402581244 [arcmin] (formal 1-sigma fit error)
    SNR: 3.89310550014739
 
  Angular difference between Flight and Ground position is 7.714798 arcmin
 
  Partial Coding Fraction: 1.015625    [ including projection effects ]

  Duration
     T90: 332.095999956131 +/- 400.138401660802
        Measured from: 137.448000073433
                   to: 469.544000029564     [s; relative to TRIGTIME]
     T50: 188.927999854088 +/- 464.215082930713
        Measured from: 207.528000116348
                   to: 396.455999970436     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 681.81200003624     
                   to: 682.81200003624     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 122.600000023842     
                   to: 844.136000037193     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     2.765350   2.317653   0.000139  -0.118546
           0.176990   0.178857   0.153693   0.137990 [error]
 Peak      0.023019   0.019741  -0.001199   0.014410
           0.006398   0.006716   0.005993   0.005308 [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 2.85e-07 2.43e-07 1.41e-07 1.23e-07 7.22e-07 7.91e-07   erg/cm2
              Error 3.17e-08 3.01e-08 3.50e-08 5.43e-08 8.92e-08 1.18e-07   erg/cm2
Peak flux Power-law 2.33e-01 1.34e-01 4.88e-02 2.34e-02 4.29e-01 4.40e-01   ph/cm2/s
              Error 9.05e-02 5.35e-02 3.67e-02 3.62e-02 1.47e-01 1.55e-01   ph/cm2/s
 
Fluence   Cutoff-PL 2.84e-07 2.83e-07 2.71e-08 5.44e-11 5.94e-07 5.94e-07   erg/cm2
              Error 3.56e-08 4.24e-08 2.78e-08 7.42e-10 6.91e-08 6.91e-08   erg/cm2
Peak flux Cutoff-PL 2.95e-01 1.02e-01 8.90e-05 2.33e-13 3.97e-01 3.97e-01   ph/cm2/s
              Error 1.03e-01 4.63e-02 5.41e-03 0.00e+00 1.25e-01 1.25e-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    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 38.98 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  721.536  122.600  844.136
T90   332.096  137.448  469.544
T50   188.928  207.528  396.456
Peak    1.000  681.812  682.812

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
  135.4659 -40.6343 0.0495   13.1   10.0       0.2920     3.9  TRIG_00818110       
------------------------------------------
 
Foreground time interval of the image:
 36.160  71.201 (delta_t =  35.041 [sec])
Background time interval of the image:
-60.000  36.160 (delta_t =  96.160 [sec])

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

Time interval is from  122.600 sec. to  844.136 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  122.600 sec. to  844.136 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  122.600 sec. to  844.136 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  681.812 sec. to  682.812 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  681.812 sec. to  682.812 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  681.812 sec. to  682.812 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)  = 2.43e-07
S(50-100 keV) = 1.41e-07

T90 vs. Hardness ratio plot

T90                                   = 332.095999956131 sec.
Hardness ratio (energy fluence ratio) = 0.580247

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 0.838105
Count Ratio (50-100 keV) / (15-25 keV) = 5.02649e-05

Mask shadow pattern

IMX = 2.300282734062352E-01, IMY = -4.058261646757861E-02

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:
-75.799400 71.200600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5257 -40.6262    0.6  13.1   10.2   3.1113  18.4    4.3	Vela X-1                      
170.4402 -60.7285    3.6  16.8  166.7   0.5240   3.2    7.3	Cen X-3                       
186.6357 -62.9103    6.5  24.7  168.8   0.3344   1.8    8.4	GX 301-2                      
147.9661 -10.4832    2.3  42.3   44.0   2.1276   5.0 ------	UNKNOWN                       
 67.5425 -59.0190    2.8  40.7  -92.8   3.2319   4.2 ------	UNKNOWN                       
 64.0467 -62.0143    3.5  41.0  -98.1   2.4878   3.3 ------	UNKNOWN

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

Time interval of the image:
36.160000 71.200600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.4658 -40.6343    3.0  13.1   10.0   0.2921   3.9    5.6	Vela X-1                      
170.4328 -60.8240   14.7  16.8  167.0  -0.0646  -0.8   12.5	Cen X-3                       
186.4507 -62.6436    8.7  24.6  168.2   0.1167   1.3    9.5	GX 301-2                      
 92.0039 -76.4432    2.2  30.5 -121.6   0.6055   5.3 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
107.000600 907.400000
909.000000 929.700590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5390 -40.5427    0.6   0.1   44.6  12.3991  19.6    0.9	Vela X-1                      
170.0613 -60.5405    6.2  29.0  172.0   1.3549   1.9    9.0	Cen X-3                       
186.7171 -62.8004    3.2  37.2  171.0   3.5625   3.6    2.5	GX 301-2                      
113.9253 -10.8713    3.0  35.3  -11.5   3.0531   3.9 ------	UNKNOWN                       
102.9813 -40.0430    2.9  24.6  -72.2   3.9441   3.9 ------	UNKNOWN                       
 76.4867 -51.4416    4.7  41.1  -98.6   8.3409   2.5 ------	UNKNOWN                       
 57.6150 -72.1651    2.9  48.0 -129.1  14.1836   4.0 ------	UNKNOWN

Plot creation:
Tue Mar 27 16:25:01 EDT 2018