batgrbproduct analysis for trigger=882252
batgrbproduct Analysis for Trigger=882252
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): Mon Jan 7 17:30:27 EST 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger882252/GCN5_download_cron
======================================================================
Trigger: 00882252 Segment: 000
BAT Trigger Time: 568474506.816 [s; MET]
Trigger Stop: 568474507.328 [s; MET]
UTC: 2019-01-06T13:34:44.611040 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 29.8861170639664 Dec: 23.8568699774236 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.34
Image Trigger?: NO
Rate S/N Ratio: 16.2172747402269 [ if not an image trigger ]
Image S/N Ratio: 8.34
Flight Position: [ source = BAT ]
RA: 29.8861170639664 Dec: 23.8568699774236 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 29.8774134464078 Dec: 23.8391942573654 [deg; J2000]
{ 01h 59m 30.6s , +23d 50' 21.1" }
+/- 0.907282188809684 [arcmin] (estimated 90% radius based on SNR)
+/- 0.326467293527897 [arcmin] (formal 1-sigma fit error)
SNR: 34.9531564739169
Angular difference between Flight and Ground position is 1.163135 arcmin
Partial Coding Fraction: 0.65625 [ including projection effects ]
Duration
T90: 78.2039999961853 +/- 2.25272455297137
Measured from: 1.83200013637543
to: 80.0360001325607 [s; relative to TRIGTIME]
T50: 62.1640000343323 +/- 0.668969406414871
Measured from: 10.9560000896454
to: 73.1200001239777 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 75.2760000228882
to: 76.2760000228882 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.167999982833862
to: 99.7159999608994 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.782558 3.583167 2.648409 0.598381
0.072710 0.076167 0.066463 0.055665 [error]
Peak 0.168347 0.253961 0.161116 0.025166
0.008888 0.009921 0.008620 0.005856 [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 9.50e-07 1.61e-06 2.07e-06 5.35e-06 6.09e-06 9.97e-06 erg/cm2
Error 5.02e-08 4.88e-08 7.08e-08 4.16e-07 1.71e-07 4.56e-07 erg/cm2
Peak flux Power-law 2.05e+00 1.84e+00 1.14e+00 1.07e+00 5.48e+00 6.10e+00 ph/cm2/s
Error 1.62e-01 9.23e-02 7.14e-02 1.33e-01 2.71e-01 2.91e-01 ph/cm2/s
Fluence Cutoff-PL 8.86e-07 1.63e-06 2.11e-06 3.64e-06 5.97e-06 8.27e-06 erg/cm2
Error 6.52e-08 5.33e-08 7.87e-08 8.81e-07 1.92e-07 9.66e-07 erg/cm2
Peak flux Cutoff-PL 1.80e+00 1.98e+00 1.20e+00 4.95e-01 5.31e+00 5.47e+00 ph/cm2/s
Error 1.94e-01 1.15e-01 8.22e-02 1.75e-01 2.82e-01 3.34e-01 ph/cm2/s
Fluence Band 8.81e-07 1.63e-06 2.11e-06 3.77e-06 5.97e-06 8.49e-06 erg/cm2
Error 6.28e-08 -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 1.71e+00 2.05e+00 1.15e+00 7.44e-01 5.27e+00 5.65e+00 ph/cm2/s
Error 1.62e-01 1.36e-01 9.00e-02 -------- 2.84e-01 3.36e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.637 0.051 - - 6.55e-03 1.77e-04 43.310 57
CPL 1.340 0.210 120.1 82.6 8.99e-03 1.99e-03 37.120 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.693 0.081 - - 4.14e-02 2.07e-03 71.310 57
CPL 0.925 0.377 68.4 14.5 1.03e-01 4.78e-02 56.830 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: 79.232000 sec.
T50 in the 50-300 keV band: 62.080000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 99.884 -0.168 99.716
T90 78.204 1.832 80.036
T50 62.164 10.956 73.120
Peak 1.000 75.276 76.276
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
29.8774 +23.8392 0.0055 33.6 -149.6 2.0751 35.0 TRIG_00882252
------------------------------------------
Foreground time interval of the image:
-0.168 9.885 (delta_t = 10.053 [sec])
Background time interval of the image:
-239.816 -0.168 (delta_t = 239.648 [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 -0.168 sec. to 99.716 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.63670 ( -0.0513912 0.051526 )
Norm@50keV : 6.55036E-03 ( -0.000176762 0.00017671 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.31 using 59 PHA bins.
# Reduced chi-squared = 0.7598 for 57 degrees of freedom
# Null hypothesis probability = 9.096150e-01
Photon flux (15-150 keV) in 99.88 sec: 0.851603 ( -0.0256906 0.0257856 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.09312e-06 ( -1.70931e-07 1.71158e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.168 sec. to 99.716 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.34013 ( -0.215087 0.205229 )
Epeak [keV] : 120.111 ( -29.0569 136.234 )
Norm@50keV : 8.98961E-03 ( -0.00172636 0.0022562 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.12 using 59 PHA bins.
# Reduced chi-squared = 0.6628 for 56 degrees of freedom
# Null hypothesis probability = 9.756952e-01
Photon flux (15-150 keV) in 99.88 sec: 0.831401 ( -0.028778 0.028926 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.96965e-06 ( -1.92229e-07 1.9161e-07 ) ergs/cm2
Band function
Time interval is from -0.168 sec. to 99.716 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.34012 ( -0.100009 0.20537 )
beta : -10.0000 ( 10 1.77636e-15 )
Epeak [keV] : 120.090 ( -29.0525 136.01 )
Norm@50keV : 8.98847E-03 ( -0.0017259 0.00225718 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.12 using 59 PHA bins.
# Reduced chi-squared = 0.6748 for 55 degrees of freedom
# Null hypothesis probability = 9.692728e-01
Photon flux (15-150 keV) in 99.88 sec: 0.825355 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.97276e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 15.5942 ( )
R^2/D10^2 : 7.81244E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 307.52 using 59 PHA bins.
# Reduced chi-squared = 5.3951 for 57 degrees of freedom
# Null hypothesis probability = 4.864154e-36
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.945e-07 2.302e-08
25- 50 1.623e-06 5.843e-08
50-150 2.731e-06 1.353e-07
15-150 4.749e-06 1.443e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 175.380 (-23.7356 -175.15)
Norm : 3.42396 (-0.110881 0.1178)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.55 using 59 PHA bins.
# Reduced chi-squared = 0.6588 for 57 degrees of freedom
# Null hypothesis probability = 9.782456e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.650e-07 4.425e-08
25- 50 1.638e-06 1.114e-07
50-150 3.436e-06 8.435e-07
15-150 5.939e-06 8.680e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.73504 (-0.746669 0.81551)
R1^2/D10^2 : 0.995145 (-0.329104 0.552095)
kT2 [keV] : 24.3835 (-2.03623 2.61129)
R2^2/D10^2 : 1.27466E-02 (-0.00410244 0.00512583)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.33 using 59 PHA bins.
# Reduced chi-squared = 0.8060 for 55 degrees of freedom
# Null hypothesis probability = 8.478532e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.279e-07 9.334e-08
25- 50 1.628e-06 1.134e-07
50-150 3.427e-06 2.267e-07
15-150 5.882e-06 3.021e-07
Peak spectrum fit
Power-law model
Time interval is from 75.276 sec. to 76.276 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.69276 ( -0.0806456 0.0815891 )
Norm@50keV : 4.13510E-02 ( -0.00207175 0.00206441 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.31 using 59 PHA bins.
# Reduced chi-squared = 1.251 for 57 degrees of freedom
# Null hypothesis probability = 9.627090e-02
Photon flux (15-150 keV) in 1 sec: 5.47805 ( -0.271126 0.271458 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.83084e-07 ( -2.00264e-08 2.00934e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 75.276 sec. to 76.276 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.925035 ( -0.394328 0.36033 )
Epeak [keV] : 68.3760 ( -9.35328 19.5896 )
Norm@50keV : 0.102775 ( -0.0351573 0.0604384 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.83 using 59 PHA bins.
# Reduced chi-squared = 1.015 for 56 degrees of freedom
# Null hypothesis probability = 4.440760e-01
Photon flux (15-150 keV) in 1 sec: 5.30544 ( -0.2818 0.28201 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.64826e-07 ( -2.1985e-08 2.1978e-08 ) ergs/cm2
Band function
Time interval is from 75.276 sec. to 76.276 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.383693 ( -0.704821 1.48227 )
beta : -2.10914 ( 2.11235 0.243639 )
Epeak [keV] : 52.1112 ( -13.9888 20.4639 )
Norm@50keV : 0.221163 ( -0.144819 2.05461 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.23 using 59 PHA bins.
# Reduced chi-squared = 0.9861 for 55 degrees of freedom
# Null hypothesis probability = 5.038793e-01
Photon flux (15-150 keV) in 1 sec: 5.26948 ( 1.73052 -0.28339 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.66604e-07 ( -3.66597e-07 -2.1302e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.2365 ( )
R^2/D10^2 : 0.954036 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 122.20 using 59 PHA bins.
# Reduced chi-squared = 2.1439 for 57 degrees of freedom
# Null hypothesis probability = 1.179834e-06
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.544e-08 3.070e-09
25- 50 1.244e-07 7.450e-09
50-150 1.393e-07 1.380e-08
15-150 2.991e-07 1.660e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 135.055 (-25.5913 31.5474)
Norm : 22.9202 (-1.32668 1.57541)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.37 using 59 PHA bins.
# Reduced chi-squared = 1.042 for 57 degrees of freedom
# Null hypothesis probability = 3.893140e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.933e-08 4.715e-09
25- 50 1.082e-07 7.980e-09
50-150 2.042e-07 5.750e-08
15-150 3.718e-07 6.350e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.35084 (-1.465 1.38748)
R1^2/D10^2 : 3.44357 (-1.22515 2.59245)
kT2 [keV] : 26.2851 (-5.55459 10.5665)
R2^2/D10^2 : 4.99482E-02 (-0.0355259 0.0835596)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.74 using 59 PHA bins.
# Reduced chi-squared = 1.032 for 55 degrees of freedom
# Null hypothesis probability = 4.098292e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.058e-08 7.170e-09
25- 50 1.182e-07 1.602e-08
50-150 1.977e-07 6.662e-08
15-150 3.665e-07 9.480e-08
Plot creation:
Mon Jan 7 17:39:45 EST 2019