batgrbproduct analysis for trigger=831816
batgrbproduct Analysis for Trigger=831816
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 May 11 19:30:52 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger831816/GCN5_download_cron
======================================================================
Trigger: 00831816 Segment: 000
BAT Trigger Time: 547676163.2 [s; MET]
Trigger Stop: 547676167.296 [s; MET]
UTC: 2018-05-10T20:15:42.277740 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 77.9887913665582 Dec: -62.3350422840413 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.44
Image Trigger?: NO
Rate S/N Ratio: 9.64365076099295 [ if not an image trigger ]
Image S/N Ratio: 9.44
Flight Position: [ source = BAT ]
RA: 77.9887913665582 Dec: -62.3350422840413 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 77.9650490839439 Dec: -62.320278437186 [deg; J2000]
{ 05h 11m 51.6s , -62d 19' 13.0" }
+/- 1.65978652924803 [arcmin] (estimated 90% radius based on SNR)
+/- 0.633086178911488 [arcmin] (formal 1-sigma fit error)
SNR: 14.748846085657
Angular difference between Flight and Ground position is 1.105612 arcmin
Partial Coding Fraction: 0.4101562 [ including projection effects ]
Duration
T90: 134.255999922752 +/- 48.2282201106147
Measured from: -13.231999874115
to: 121.024000048637 [s; relative to TRIGTIME]
T50: 29.1040000915527 +/- 7.8297566036059
Measured from: 0.976000070571899
to: 30.0800001621246 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.96399998664856
to: 1.96399998664856 [s; relative to TRIGTIME]
Total Fluence
Measured from: -19.9200000762939
to: 137.103999972343 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.415793 1.668909 0.772850 0.209400
0.121462 0.123309 0.103905 0.088855 [error]
Peak 0.039333 0.059013 0.044517 -0.001380
0.010304 0.010721 0.009077 0.007498 [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 4.74e-07 6.42e-07 6.41e-07 1.16e-06 2.13e-06 2.91e-06 erg/cm2
Error 6.11e-08 5.79e-08 9.91e-08 3.53e-07 2.28e-07 4.62e-07 erg/cm2
Peak flux Power-law 4.63e-01 4.19e-01 2.61e-01 2.49e-01 1.25e+00 1.39e+00 ph/cm2/s
Error 1.44e-01 8.49e-02 7.22e-02 1.36e-01 2.50e-01 2.80e-01 ph/cm2/s
Fluence Cutoff-PL 4.59e-07 6.79e-07 6.23e-07 5.05e-07 2.03e-06 2.26e-06 erg/cm2
Error 6.62e-08 6.12e-08 1.17e-07 7.08e-07 2.77e-07 7.32e-07 erg/cm2
Peak flux Cutoff-PL 4.46e-01 4.35e-01 2.67e-01 1.70e-01 1.24e+00 1.32e+00 ph/cm2/s
Error 1.20e-01 1.03e-01 7.79e-02 1.53e-01 2.54e-01 3.28e-01 ph/cm2/s
Fluence Band 4.30e-07 7.23e-07 5.74e-07 7.33e-07 2.01e-06 2.47e-06 erg/cm2
Error 7.05e-08 -------- 1.16e-07 -------- 2.43e-07 -------- 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 2.003 0.170 - - 1.47e-03 1.65e-04 52.020 57
CPL 1.553 0.760 40.5 0.0 2.70e-03 0.00e+00 50.780 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.681 0.347 - - 9.46e-03 2.05e-03 60.480 57
CPL 1.380 1.180 96.4 0.0 1.38e-02 4.08e-02 60.290 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: 29.760000 sec.
T50 in the 50-300 keV band: 17.088000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 157.024 -19.920 137.104
T90 134.256 -13.232 121.024
T50 29.104 0.976 30.080
Peak 1.000 0.964 1.964
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
77.9650 -62.3203 0.0131 29.7 -103.8 4.3648 14.7 TRIG_00831816
------------------------------------------
Foreground time interval of the image:
-19.920 137.104 (delta_t = 157.024 [sec])
Background time interval of the image:
-239.200 -19.920 (delta_t = 219.280 [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 -19.920 sec. to 137.104 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.00270 ( -0.166335 0.173641 )
Norm@50keV : 1.47195E-03 ( -0.000167086 0.000163872 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.02 using 59 PHA bins.
# Reduced chi-squared = 0.9126 for 57 degrees of freedom
# Null hypothesis probability = 6.621089e-01
Photon flux (15-150 keV) in 157 sec: 0.221068 ( -0.0199508 0.0199586 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.13143e-06 ( -2.26272e-07 2.30134e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -19.920 sec. to 137.104 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.55349 ( -0.850147 0.669184 )
Epeak [keV] : 40.5012 ( )
Norm@50keV : 2.70376E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.78 using 59 PHA bins.
# Reduced chi-squared = 0.9067 for 56 degrees of freedom
# Null hypothesis probability = 6.723449e-01
Photon flux (15-150 keV) in 157 sec: 0.217246 ( -0.020791 0.02075 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.02561e-06 ( -2.75158e-07 2.79758e-07 ) ergs/cm2
Band function
Time interval is from -19.920 sec. to 137.104 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.29905 ( -1.68579 -0.333355 )
beta : -2.36848 ( -0.450241 0.309646 )
Epeak [keV] : 29.7174 ( -6.86465 7.73338 )
Norm@50keV : 0.266595 ( -0.258292 75.3244 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.28 using 59 PHA bins.
# Reduced chi-squared = 0.8414 for 55 degrees of freedom
# Null hypothesis probability = 7.926028e-01
Photon flux (15-150 keV) in 157 sec: 0.214427 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.00729e-06 ( -2.00619e-06 -2.40179e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 9.04007 (-0.890041 1.02027)
R^2/D10^2 : 0.151072 (-0.0519311 0.0764084)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.66 using 59 PHA bins.
# Reduced chi-squared = 1.222 for 57 degrees of freedom
# Null hypothesis probability = 1.211214e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.782e-07 5.322e-08
25- 50 8.096e-07 9.075e-08
50-150 3.130e-07 8.211e-08
15-150 1.501e-06 1.724e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 64.0540 (-15.9175 24.5401)
Norm : 1.12444 (-0.164718 0.189718)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.93 using 59 PHA bins.
# Reduced chi-squared = 0.8935 for 57 degrees of freedom
# Null hypothesis probability = 7.009199e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.480e-07 5.550e-08
25- 50 6.954e-07 7.026e-08
50-150 8.343e-07 2.005e-07
15-150 1.978e-06 2.481e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.05241 (-1.12357 1.16311)
R1^2/D10^2 : 0.332783 (-0.136805 0.333251)
kT2 [keV] : 30.7413 (-10.3888 31.3265)
R2^2/D10^2 : 8.39455E-04 (-0.000828988 0.00249398)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.21 using 59 PHA bins.
# Reduced chi-squared = 0.8039 for 55 degrees of freedom
# Null hypothesis probability = 8.508321e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.399e-07 1.356e-07
25- 50 7.040e-07 2.046e-07
50-150 8.898e-07 4.984e-07
15-150 2.034e-06 8.139e-07
Peak spectrum fit
Power-law model
Time interval is from 0.964 sec. to 1.964 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.68118 ( -0.339059 0.354878 )
Norm@50keV : 9.46234E-03 ( -0.00207313 0.00201875 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.48 using 59 PHA bins.
# Reduced chi-squared = 1.061 for 57 degrees of freedom
# Null hypothesis probability = 3.513167e-01
Photon flux (15-150 keV) in 1 sec: 1.24855 ( -0.250167 0.250432 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.77474e-08 ( -1.98312e-08 2.02476e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.964 sec. to 1.964 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.38021 ( -1.44041 0.918621 )
Epeak [keV] : 96.4026 ( -96.4037 -96.4037 )
Norm@50keV : 1.37592E-02 ( -0.0137591 0.0678201 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.29 using 59 PHA bins.
# Reduced chi-squared = 1.077 for 56 degrees of freedom
# Null hypothesis probability = 3.233581e-01
Photon flux (15-150 keV) in 1 sec: 1.23729 ( -0.254065 0.25399 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.57851e-08 ( -2.12562e-08 2.15259e-08 ) ergs/cm2
Band function
Time interval is from 0.964 sec. to 1.964 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.41719 ( 1.41719 1.14927 )
beta : -7.78423 ( 9.0662 19.0662 )
Epeak [keV] : 103.854 ( -63.1822 -103.079 )
Norm@50keV : 1.31274E-02 ( -0.00260739 0.00940557 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.30 using 59 PHA bins.
# Reduced chi-squared = 1.096 for 55 degrees of freedom
# Null hypothesis probability = 2.902494e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 8.55768e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.5065 (-3.45519 4.7572)
R^2/D10^2 : 0.260943 (-0.177575 0.58385)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.41 using 59 PHA bins.
# Reduced chi-squared = 1.200 for 57 degrees of freedom
# Null hypothesis probability = 1.432616e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.653e-09 3.559e-09
25- 50 2.856e-08 1.154e-08
50-150 2.759e-08 1.290e-08
15-150 6.480e-08 2.442e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 144.748 (-78.8568 -142.285)
Norm : 5.16430 (-1.11978 1.649)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.32 using 59 PHA bins.
# Reduced chi-squared = 1.058 for 57 degrees of freedom
# Null hypothesis probability = 3.566251e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.330e-08 7.595e-09
25- 50 2.453e-08 1.355e-08
50-150 4.770e-08 2.979e-08
15-150 8.553e-08 5.080e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.50863 (-2.21454 2.87878)
R1^2/D10^2 : 2.02916 (-1.4877 3.37977)
kT2 [keV] : 25.9516 (-9.29805 35.2949)
R2^2/D10^2 : 1.42840E-02 (-0.0133952 0.0353636)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.73 using 59 PHA bins.
# Reduced chi-squared = 1.068 for 55 degrees of freedom
# Null hypothesis probability = 3.404314e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.436e-08 8.300e-09
25- 50 2.454e-08 1.302e-08
50-150 4.889e-08 2.796e-08
15-150 8.778e-08 4.646e-08
Plot creation:
Fri May 11 19:35:21 EDT 2018