batgrbproduct analysis for trigger=841548
batgrbproduct Analysis for Trigger=841548
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 20:48:30 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger841548/GCN5_download_cron
======================================================================
Trigger: 00841548 Segment: 000
BAT Trigger Time: 550696594.752 [s; MET]
Trigger Stop: 550696595.776 [s; MET]
UTC: 2018-06-14T19:16:13.646380 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 3.15726986515184 Dec: 46.9428648506083 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.68
Image Trigger?: NO
Rate S/N Ratio: 11.7898261225516 [ if not an image trigger ]
Image S/N Ratio: 6.68
Flight Position: [ source = BAT ]
RA: 3.15726986515184 Dec: 46.9428648506083 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 3.07345583992986 Dec: 46.9688193973932 [deg; J2000]
{ 00h 12m 17.6s , +46d 58' 07.7" }
+/- 1.86810236139909 [arcmin] (estimated 90% radius based on SNR)
+/- 0.710124217662738 [arcmin] (formal 1-sigma fit error)
SNR: 12.4567038057975
Angular difference between Flight and Ground position is 3.769233 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 7.04399991035461 +/- 0.917474786708231
Measured from: -3.93599987030029
to: 3.10800004005432 [s; relative to TRIGTIME]
T50: 3.98000001907349 +/- 1.0792756898556
Measured from: -1.86799991130829
to: 2.1120001077652 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.56400001049042
to: 2.56400001049042 [s; relative to TRIGTIME]
Total Fluence
Measured from: -4.34799993038177
to: 3.45200002193451 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.118207 0.117168 0.086708 0.035500
0.015274 0.015508 0.013543 0.011335 [error]
Peak 0.021846 0.028350 0.032533 0.004664
0.005547 0.005703 0.005182 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 2.87e-08 5.18e-08 7.19e-08 2.08e-07 2.07e-07 3.60e-07 erg/cm2
Error 6.60e-09 6.96e-09 1.37e-08 8.82e-08 3.21e-08 9.84e-08 erg/cm2
Peak flux Power-law 1.85e-01 2.14e-01 1.78e-01 2.49e-01 6.68e-01 8.27e-01 ph/cm2/s
Error 6.23e-02 4.53e-02 4.01e-02 1.16e-01 1.28e-01 1.65e-01 ph/cm2/s
Fluence Cutoff-PL 2.84e-08 5.19e-08 7.24e-08 2.10e-07 2.07e-07 3.65e-07 erg/cm2
Error 6.61e-09 6.90e-09 1.35e-08 8.97e-08 3.13e-08 1.08e-07 erg/cm2
Peak flux Cutoff-PL 1.32e-01 2.37e-01 2.01e-01 7.18e-02 6.24e-01 6.42e-01 ph/cm2/s
Error 1.09e-01 5.59e-02 5.10e-02 1.35e-01 1.41e-01 1.92e-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 1.528 0.257 - - 2.81e-03 3.87e-04 62.180 57
CPL 2.652 0.401 208.4 0.0 8.01e-04 0.00e+00 59.600 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.266 0.317 - - 5.63e-03 1.07e-03 60.290 57
CPL -0.281 2.205 77.4 -28.4 3.08e-02 2.53e-01 57.670 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: 5.888000 sec.
T50 in the 50-300 keV band: 1.920000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 7.800 -4.348 3.452
T90 7.044 -3.936 3.108
T50 3.980 -1.868 2.112
Peak 1.000 1.564 2.564
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
3.0735 +46.9688 0.0154 15.9 -26.9 0.3904 12.5 TRIG_00841548
------------------------------------------
Foreground time interval of the image:
-4.348 3.452 (delta_t = 7.800 [sec])
Background time interval of the image:
-239.752 -88.612 (delta_t = 151.140 [sec])
-87.752 -4.348 (delta_t = 83.404 [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 -4.348 sec. to 3.452 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.52793 ( -0.254251 0.259998 )
Norm@50keV : 2.80553E-03 ( -0.000391433 0.000383556 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.18 using 59 PHA bins.
# Reduced chi-squared = 1.091 for 57 degrees of freedom
# Null hypothesis probability = 2.970284e-01
Photon flux (15-150 keV) in 7.8 sec: 0.352937 ( -0.0463645 0.0464528 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.0668e-07 ( -3.18235e-08 3.23665e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -4.348 sec. to 3.452 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.65224 ( -0.585203 0.216161 )
Epeak [keV] : 208.401 ( )
Norm@50keV : 8.01327E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.60 using 59 PHA bins.
# Reduced chi-squared = 1.064 for 56 degrees of freedom
# Null hypothesis probability = 3.462121e-01
Photon flux (15-150 keV) in 7.8 sec: 0.353839 ( -0.047556 0.045749 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.07476e-07 ( -3.26625e-08 2.99887e-08 ) ergs/cm2
Band function
Time interval is from -4.348 sec. to 3.452 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.23723 ( 1.23734 1.23734 )
beta : -1.52791 ( -0.260247 0.254331 )
Epeak [keV] : 30.1970 ( -30.1658 -30.1658 )
Norm@50keV : 5.75050E-03 ( -0.0033098 0.42769 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.18 using 59 PHA bins.
# Reduced chi-squared = 1.130 for 55 degrees of freedom
# Null hypothesis probability = 2.358914e-01
Photon flux (15-150 keV) in 7.8 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] : 14.6671 (-2.70336 3.57088)
R^2/D10^2 : 4.08745E-02 (-0.0406272 0.0427181)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 86.75 using 59 PHA bins.
# Reduced chi-squared = 1.522 for 57 degrees of freedom
# Null hypothesis probability = 6.740287e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.441e-08 4.185e-09
25- 50 5.606e-08 1.089e-08
50-150 8.124e-08 2.169e-08
15-150 1.517e-07 3.264e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.361 (-83.6415 -199.363)
Norm : 1.42836 (-0.185781 0.186059)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.19 using 59 PHA bins.
# Reduced chi-squared = 1.126 for 57 degrees of freedom
# Null hypothesis probability = 2.392087e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.774e-08 1.576e-08
25- 50 5.337e-08 2.960e-08
50-150 1.170e-07 6.575e-08
15-150 1.982e-07 1.113e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.89322 (-1.34313 3.89293)
R1^2/D10^2 : 4.45108 (-4.17484 39.7751)
kT2 [keV] : 23.2552 (-6.09098 29.8068)
R2^2/D10^2 : 7.62144E-03 (-0.00714817 0.0119812)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.57 using 59 PHA bins.
# Reduced chi-squared = 1.156 for 55 degrees of freedom
# Null hypothesis probability = 2.001144e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.345e-08 1.741e-08
25- 50 4.087e-08 1.471e-08
50-150 1.278e-07 4.909e-08
15-150 2.022e-07 7.553e-08
Peak spectrum fit
Power-law model
Time interval is from 1.564 sec. to 2.564 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.26647 ( -0.317753 0.316005 )
Norm@50keV : 5.63090E-03 ( -0.0010689 0.00106734 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.29 using 59 PHA bins.
# Reduced chi-squared = 1.058 for 57 degrees of freedom
# Null hypothesis probability = 3.576639e-01
Photon flux (15-150 keV) in 1 sec: 0.667808 ( -0.128158 0.128485 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.61127e-08 ( -1.18007e-08 1.20154e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.564 sec. to 2.564 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.281110 ( -2.80501 1.60571 )
Epeak [keV] : 77.3749 ( -20.5182 -77.3635 )
Norm@50keV : 3.08035E-02 ( -0.0308322 0.475486 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.67 using 59 PHA bins.
# Reduced chi-squared = 1.030 for 56 degrees of freedom
# Null hypothesis probability = 4.133110e-01
Photon flux (15-150 keV) in 1 sec: 0.623506 ( -0.143068 0.13863 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.08284e-08 ( -1.25562e-08 1.33553e-08 ) ergs/cm2
Band function
Time interval is from 1.564 sec. to 2.564 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.449916 ( 0.248104 4.11142 )
beta : -2.53742 ( 8.94765 18.9476 )
Epeak [keV] : 73.7702 ( -18.4506 126.814 )
Norm@50keV : 3.75389E-02 ( -0.0188548 0.596732 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.55 using 59 PHA bins.
# Reduced chi-squared = 1.046 for 55 degrees of freedom
# Null hypothesis probability = 3.810585e-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] : 17.3288 (-3.12744 4.10727)
R^2/D10^2 : 5.08641E-02 (-0.0261777 0.0488331)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.18 using 59 PHA bins.
# Reduced chi-squared = 1.021 for 57 degrees of freedom
# Null hypothesis probability = 4.315919e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.094e-09 1.130e-09
25- 50 1.390e-08 4.536e-09
50-150 2.997e-08 1.087e-08
15-150 4.697e-08 1.500e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-76.7509 -200)
Norm : 2.75876 (-0.525628 0.525628)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.57 using 59 PHA bins.
# Reduced chi-squared = 1.080 for 57 degrees of freedom
# Null hypothesis probability = 3.159075e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.870e-09 3.964e-09
25- 50 1.321e-08 7.835e-09
50-150 2.898e-08 1.683e-08
15-150 4.907e-08 2.829e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.65690 (-3.56862 176.84)
R1^2/D10^2 : 4.14113 (-4.48069 63.7724)
kT2 [keV] : 18.8376 (-3.8192 -18.8068)
R2^2/D10^2 : 3.65911E-02 (-0.036822 0.0221444)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.37 using 59 PHA bins.
# Reduced chi-squared = 1.025 for 55 degrees of freedom
# Null hypothesis probability = 4.234482e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.958e-09 2.791e-09
25- 50 1.290e-08 6.967e-09
50-150 3.187e-08 1.629e-08
15-150 4.973e-08 2.533e-08
Plot creation:
Fri Jun 15 20:52:22 EDT 2018