batgrbproduct analysis for trigger=841583
batgrbproduct Analysis for Trigger=841583
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): Fri Jun 15 20:41:34 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger841583/GCN5_download_cron
======================================================================
Trigger: 00841583 Segment: 000
BAT Trigger Time: 550700968 [s; MET]
Trigger Stop: 550701776 [s; MET]
UTC: 2018-06-14T20:29:06.894120 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 245.067151721463 Dec: -15.704157707538 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 18.18
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 18.18
Flight Position: [ source = BAT ]
RA: 245.067151721463 Dec: -15.704157707538 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 244.98233622337 Dec: -15.6311850461636 [deg; J2000]
{ 16h 19m 55.8s , -15d 37' 52.3" }
+/- 0.722917402447148 [arcmin] (estimated 90% radius based on SNR)
+/- 0.207611872363904 [arcmin] (formal 1-sigma fit error)
SNR: 48.3526483998301
Angular difference between Flight and Ground position is 6.571037 arcmin
Partial Coding Fraction: 0.9921875 [ including projection effects ]
Duration
T90: 842.683999896049 +/- 18.9701294260881
Measured from: -34.9279998540878
to: 807.756000041962 [s; relative to TRIGTIME]
T50: 458.072000026703 +/- 20.7525693436005
Measured from: 136.160000085831
to: 594.232000112534 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 360.827999949455
to: 361.827999949455 [s; relative to TRIGTIME]
Total Fluence
Measured from: -84.567999958992
to: 867.111999988556 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 25.582787 2.365183 0.196028 -0.054104
0.195108 0.177337 0.148386 0.126908 [error]
Peak 0.043367 0.013651 0.004641 0.004589
0.006387 0.005492 0.004795 0.004092 [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 8.12e-06 1.02e-06 5.62e-08 3.25e-09 9.20e-06 9.20e-06 erg/cm2
Error 6.42e-07 9.42e-08 1.41e-08 1.41e-09 6.27e-07 6.27e-07 erg/cm2
Peak flux Power-law 4.21e-01 1.18e-01 1.78e-02 3.06e-03 5.59e-01 5.60e-01 ph/cm2/s
Error 1.05e-01 5.85e-02 2.27e-02 7.54e-03 1.35e-01 1.36e-01 ph/cm2/s
Fluence Cutoff-PL 7.63e-06 8.27e-07 1.69e-09 4.17e-15 8.46e-06 8.46e-06 erg/cm2
Error 7.52e-07 1.14e-07 3.71e-09 6.65e-13 7.61e-07 7.61e-07 erg/cm2
Peak flux Cutoff-PL 4.21e-01 1.17e-01 1.75e-02 2.97e-03 5.58e-01 5.59e-01 ph/cm2/s
Error 1.04e-01 -------- -------- -------- -------- 1.36e-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 6.187 0.243 - - 6.56e-05 1.33e-05 65.370 57
CPL 1.000 0.000 50.0 0.0 9.98e-04 0.00e+00 738.840 56
The chi2 of BB fit is 48.93 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 3.729 1.022 - - 1.14e-03 1.02e-03 36.730 57
CPL 1.000 0.000 50.0 0.0 9.59e-03 0.00e+00 55.950 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 951.680 -84.568 867.112
T90 842.684 -34.928 807.756
T50 458.072 136.160 594.232
Peak 1.000 360.828 361.828
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
244.9823 -15.6312 0.0040 10.4 34.9 29.5562 48.4 TRIG_00841583
------------------------------------------
Foreground time interval of the image:
-14.899 612.550 (delta_t = 627.449 [sec])
614.000 807.701 (delta_t = 193.701 [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
-84.568000 -29.496300
-28.000000 612.550000
614.000000 867.112000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 6.18731 ( -0.243661 0.243115 )
Norm@50keV : 6.55548E-05 ( -1.21913e-05 1.43619e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.37 using 59 PHA bins.
# Reduced chi-squared = 1.147 for 57 degrees of freedom
# Null hypothesis probability = 2.087807e-01
Photon flux (15-150 keV) in 948.7 sec: 0.325826 ( -0.0243609 0.0247107 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.20117e-06 ( -6.22963e-07 6.30942e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-84.568000 -29.496300
-28.000000 612.550000
614.000000 867.112000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 9.98006E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 738.84 using 59 PHA bins.
# Reduced chi-squared = 13.194 for 56 degrees of freedom
# Null hypothesis probability = 7.604766e-120
Photon flux (15-150 keV) in 948.7 sec: 0.298680 ( -0.030101 0.029391 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.45979e-06 ( -7.7079e-07 7.51873e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-84.568000 -29.496300
-28.000000 612.550000
614.000000 867.112000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -7.99694 ( 3.19519 7.99694 )
beta : -6.20705 ( -0.229719 0.258246 )
Epeak [keV] : 304.397 ( -304.397 -304.397 )
Norm@50keV : 8.75800E-03 ( -0.00158209 0.00203115 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.39 using 59 PHA bins.
# Reduced chi-squared = 1.189 for 55 degrees of freedom
# Null hypothesis probability = 1.593047e-01
Photon flux (15-150 keV) in 948.7 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] : 2.74638 (-0.122045 0.132466)
R^2/D10^2 : 73.7234 (-23.8821 34.757)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.93 using 59 PHA bins.
# Reduced chi-squared = 0.8584 for 57 degrees of freedom
# Null hypothesis probability = 7.678508e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.394e-06 8.429e-07
25- 50 7.833e-07 9.563e-08
50-150 5.954e-10 2.672e-10
15-150 8.178e-06 7.917e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 4.71940 (-0.300211 0.338181)
Norm : 87.5326 (-24.1666 33.0804)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.30 using 59 PHA bins.
# Reduced chi-squared = 0.8474 for 57 degrees of freedom
# Null hypothesis probability = 7.872801e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.783e-06 7.931e-07
25- 50 8.606e-07 1.001e-07
50-150 3.306e-09 1.347e-09
15-150 8.647e-06 7.746e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.70443 (-2.70385 0.142699)
R1^2/D10^2 : 82.6249 (-28.5151 77.1194)
kT2 [keV] : 17.7250 (-17.7268 -17.7275)
R2^2/D10^2 : 3.14430E-04 (-0.000314225 0.0209304)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.03 using 59 PHA bins.
# Reduced chi-squared = 0.8369 for 55 degrees of freedom
# Null hypothesis probability = 8.001288e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.488e-06 9.819e-07
25- 50 8.329e-07 1.232e-07
50-150 1.963e-07 1.469e-07
15-150 8.518e-06 1.172e-06
Peak spectrum fit
Power-law model
Time interval is from 360.828 sec. to 361.828 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.72879 ( -0.850141 1.19422 )
Norm@50keV : 1.14336E-03 ( -0.000807975 0.00122762 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.73 using 59 PHA bins.
# Reduced chi-squared = 0.6444 for 57 degrees of freedom
# Null hypothesis probability = 9.830544e-01
Photon flux (15-150 keV) in 1 sec: 0.558726 ( -0.135101 0.135123 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.08342e-08 ( -6.43239e-09 7.53085e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 360.828 sec. to 361.828 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 9.58991E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.95 using 59 PHA bins.
# Reduced chi-squared = 0.9990 for 56 degrees of freedom
# Null hypothesis probability = 4.768974e-01
Photon flux (15-150 keV) in 1 sec: 0.557962 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.03626e-08 ( 0 0 ) ergs/cm2
Band function
Time interval is from 360.828 sec. to 361.828 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -7.52160 ( 7.5216 7.5216 )
beta : -3.72894 ( -1.19455 0.849872 )
Epeak [keV] : 18.6325 ( -18.6325 -18.6325 )
Norm@50keV : 0.155377 ( -0.109811 0.166854 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.73 using 59 PHA bins.
# Reduced chi-squared = 0.6678 for 55 degrees of freedom
# Null hypothesis probability = 9.724508e-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] : 3.34129 (-0.881803 1.30691)
R^2/D10^2 : 37.2944 (-37.3533 215.876)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.63 using 59 PHA bins.
# Reduced chi-squared = 0.7128 for 57 degrees of freedom
# Null hypothesis probability = 9.501775e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.321e-08 7.500e-09
25- 50 2.763e-09 1.720e-09
50-150 1.019e-11 1.127e-11
15-150 1.598e-08 9.425e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 9.23942 (-4.14147 9.90271)
Norm : 21.9524 (-15.057 79.1842)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.93 using 59 PHA bins.
# Reduced chi-squared = 0.6830 for 57 degrees of freedom
# Null hypothesis probability = 9.678187e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.277e-08 7.515e-09
25- 50 4.929e-09 3.150e-09
50-150 2.706e-10 2.523e-10
15-150 1.797e-08 9.910e-09
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.55611 (-0.92455 1.0899)
R1^2/D10^2 : 160.930 (-142.342 4224.53)
kT2 [keV] : 11.5388 (-5.91985 16.3409)
R2^2/D10^2 : 6.55153E-02 (-0.0627038 0.721295)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 34.91 using 59 PHA bins.
# Reduced chi-squared = 0.6348 for 55 degrees of freedom
# Null hypothesis probability = 9.842145e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.219e-08 6.840e-09
25- 50 6.348e-09 3.945e-09
50-150 4.299e-09 3.790e-09
15-150 2.284e-08 1.170e-08
Plot creation:
Fri Jun 15 20:46:39 EDT 2018