batgrbproduct analysis for trigger=849018
batgrbproduct Analysis for Trigger=849018
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): Sun Jul 22 13:56:33 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger849018/GCN5_download_cron
======================================================================
Trigger: 00849018 Segment: 000
BAT Trigger Time: 553864029.696 [s; MET]
Trigger Stop: 553864030.72 [s; MET]
UTC: 2018-07-21T11:06:48.396880 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 347.694926138303 Dec: 4.87966224106747 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.61
Image Trigger?: NO
Rate S/N Ratio: 14.2828568570857 [ if not an image trigger ]
Image S/N Ratio: 7.61
Flight Position: [ source = BAT ]
RA: 347.694926138303 Dec: 4.87966224106747 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 347.707623858814 Dec: 4.87114971624257 [deg; J2000]
{ 23h 10m 49.8s , +04d 52' 16.1" }
+/- 1.77563251961986 [arcmin] (estimated 90% radius based on SNR)
+/- 0.767249768881852 [arcmin] (formal 1-sigma fit error)
SNR: 13.3936726289758
Angular difference between Flight and Ground position is 0.914937 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 47.6119998693466 +/- 2.9961741829018
Measured from: 0.0800001621246338
to: 47.6920000314713 [s; relative to TRIGTIME]
T50: 15.3040000200272 +/- 27.0325613838356
Measured from: 1.97200012207031
to: 17.2760001420975 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.81599998474121
to: 2.81599998474121 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.391999959945679
to: 48.9160000085831 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.186829 0.347594 0.277372 0.084557
0.040417 0.042194 0.036716 0.031625 [error]
Peak 0.024189 0.045188 0.032972 0.013203
0.005984 0.006502 0.005761 0.004637 [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 5.99e-08 1.28e-07 2.15e-07 8.25e-07 5.92e-07 1.23e-06 erg/cm2
Error 1.41e-08 1.84e-08 3.44e-08 2.91e-07 8.65e-08 3.14e-07 erg/cm2
Peak flux Power-law 2.35e-01 2.81e-01 2.43e-01 3.60e-01 8.86e-01 1.12e+00 ph/cm2/s
Error 6.66e-02 4.97e-02 4.50e-02 1.39e-01 1.40e-01 1.89e-01 ph/cm2/s
Fluence Cutoff-PL 5.45e-08 1.35e-07 2.24e-07 3.88e-07 5.68e-07 8.01e-07 erg/cm2
Error 1.68e-08 2.25e-08 3.85e-08 4.19e-07 9.65e-08 3.67e-07 erg/cm2
Peak flux Cutoff-PL 2.13e-01 2.97e-01 2.55e-01 1.91e-01 8.68e-01 9.57e-01 ph/cm2/s
Error 7.78e-02 6.11e-02 5.16e-02 1.99e-01 1.45e-01 2.64e-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 1.252 0.224 - - 1.20e-03 1.56e-04 54.330 57
CPL 0.720 0.910 123.8 0.0 2.20e-03 0.00e+00 53.320 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.208 0.265 - - 7.54e-03 1.18e-03 57.990 57
CPL 0.653 1.061 122.4 -32.1 1.44e-02 3.46e-02 57.200 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: 6.144000 sec.
T50 in the 50-300 keV band: 3.392000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 49.308 -0.392 48.916
T90 47.612 0.080 47.692
T50 15.304 1.972 17.276
Peak 1.000 1.816 2.816
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
347.7076 +4.8711 0.0144 5.2 -177.9 0.6619 13.4 TRIG_00849018
------------------------------------------
Foreground time interval of the image:
-0.392 18.805 (delta_t = 19.197 [sec])
Background time interval of the image:
-239.696 -147.696 (delta_t = 92.000 [sec])
-146.696 -98.326 (delta_t = 48.370 [sec])
-97.696 -0.392 (delta_t = 97.304 [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
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
Time interval is from -0.392 sec. to 48.916 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.25243 ( -0.225636 0.222435 )
Norm@50keV : 1.19948E-03 ( -0.000156185 0.000155938 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.33 using 59 PHA bins.
# Reduced chi-squared = 0.9531 for 57 degrees of freedom
# Null hypothesis probability = 5.759762e-01
Photon flux (15-150 keV) in 49.31 sec: 0.141923 ( -0.0187735 0.018805 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.91562e-07 ( -8.60129e-08 8.70721e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.392 sec. to 48.916 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.719999 ( -1.11977 0.699307 )
Epeak [keV] : 123.785 ( )
Norm@50keV : 2.19657E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.32 using 59 PHA bins.
# Reduced chi-squared = 0.9521 for 56 degrees of freedom
# Null hypothesis probability = 5.771288e-01
Photon flux (15-150 keV) in 49.31 sec: 0.138762 ( -0.019672 0.019564 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.68027e-07 ( -9.69065e-08 9.61249e-08 ) ergs/cm2
Band function
Time interval is from -0.392 sec. to 48.916 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.536083 ( 0.430293 0.430293 )
beta : -1.57807 ( 1.61205 0.517108 )
Epeak [keV] : 96.1808 ( -86.7846 474.637 )
Norm@50keV : 2.82827E-03 ( -0.00342079 23.8454 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.99 using 59 PHA bins.
# Reduced chi-squared = 0.9635 for 55 degrees of freedom
# Null hypothesis probability = 5.516441e-01
Photon flux (15-150 keV) in 49.31 sec: 0.138086 ( 6.86191 -0.019651 ) 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] : 16.9328 (-2.57954 3.27336)
R^2/D10^2 : 1.12406E-02 (-0.00504183 0.00848559)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.23 using 59 PHA bins.
# Reduced chi-squared = 1.074 for 57 degrees of freedom
# Null hypothesis probability = 3.268673e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.240e-08 8.467e-09
25- 50 1.429e-07 2.867e-08
50-150 2.922e-07 7.749e-08
15-150 4.675e-07 9.061e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-47.2633 -200)
Norm : 0.585390 (-0.0768873 0.0768873)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.27 using 59 PHA bins.
# Reduced chi-squared = 1.022 for 57 degrees of freedom
# Null hypothesis probability = 4.283152e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.188e-08 4.046e-08
25- 50 1.383e-07 7.803e-08
50-150 3.033e-07 1.672e-07
15-150 5.134e-07 2.875e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 10.7085 (-6.68778 4.56769)
R1^2/D10^2 : 3.58696E-02 (-0.0210105 0.61442)
kT2 [keV] : 40.8198 (-23.8704 -43.459)
R2^2/D10^2 : 4.39807E-04 (-0.000340641 0.00663447)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.38 using 59 PHA bins.
# Reduced chi-squared = 0.9705 for 55 degrees of freedom
# Null hypothesis probability = 5.368490e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.673e-08 2.658e-08
25- 50 1.466e-07 8.079e-08
50-150 3.819e-07 2.092e-07
15-150 5.752e-07 3.037e-07
Peak spectrum fit
Power-law model
Time interval is from 1.816 sec. to 2.816 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.20845 ( -0.267492 0.262027 )
Norm@50keV : 7.53922E-03 ( -0.00118288 0.00118063 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.99 using 59 PHA bins.
# Reduced chi-squared = 1.017 for 57 degrees of freedom
# Null hypothesis probability = 4.385739e-01
Photon flux (15-150 keV) in 1 sec: 0.886019 ( -0.140376 0.140558 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.6307e-08 ( -1.34195e-08 1.36212e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.816 sec. to 2.816 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.653294 ( -1.43309 0.689175 )
Epeak [keV] : 122.356 ( -58.1434 -122.353 )
Norm@50keV : 1.43819E-02 ( -0.00780321 0.0614708 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.20 using 59 PHA bins.
# Reduced chi-squared = 1.021 for 56 degrees of freedom
# Null hypothesis probability = 4.302716e-01
Photon flux (15-150 keV) in 1 sec: 0.868456 ( -0.145822 0.144744 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.29276e-08 ( -1.56121e-08 1.51407e-08 ) ergs/cm2
Band function
Time interval is from 1.816 sec. to 2.816 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.312691 ( -0.141897 4.84678 )
beta : -1.62466 ( 1.60312 0.543899 )
Epeak [keV] : 64.5787 ( -64.5289 389.321 )
Norm@50keV : 5.24948E-02 ( -0.0545303 57.9352 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.12 using 59 PHA bins.
# Reduced chi-squared = 1.020 for 55 degrees of freedom
# Null hypothesis probability = 4.326470e-01
Photon flux (15-150 keV) in 1 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] : 16.2377 (-2.87888 3.94806)
R^2/D10^2 : 8.18974E-02 (-0.0426649 0.0774444)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.25 using 59 PHA bins.
# Reduced chi-squared = 1.092 for 57 degrees of freedom
# Null hypothesis probability = 2.946811e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.450e-09 1.339e-09
25- 50 1.896e-08 4.855e-09
50-150 3.514e-08 1.225e-08
15-150 5.854e-08 1.537e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-56.5974 -200)
Norm : 3.62584 (-0.576427 0.576427)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.68 using 59 PHA bins.
# Reduced chi-squared = 1.082 for 57 degrees of freedom
# Null hypothesis probability = 3.125080e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.029e-09 5.205e-09
25- 50 1.737e-08 9.865e-09
50-150 3.809e-08 2.150e-08
15-150 6.449e-08 3.622e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 11.5904 (-3.60474 4.09647)
R1^2/D10^2 : 0.197700 (-0.115162 0.196837)
kT2 [keV] : 67.3703 (-42.7052 -66.6367)
R2^2/D10^2 : 7.73002E-04 (-0.000764941 0.0159611)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.22 using 59 PHA bins.
#Fit statistic : Chi-Squared = 55.14 using 59 PHA bins.
# Reduced chi-squared = 1.004 for 55 degrees of freedom
# Reduced chi-squared = 1.002 for 55 degrees of freedom
# Null hypothesis probability = 4.664251e-01
# Null hypothesis probability = 4.695085e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.015e-09 3.539e-09
25- 50 1.908e-08 1.095e-08
50-150 4.980e-08 2.726e-08
15-150 7.490e-08 3.616e-08
Plot creation:
Sun Jul 22 14:00:10 EDT 2018