batgrbproduct analysis for trigger=1002158
batgrbproduct Analysis for Trigger=1002158
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 v2.48
Process Start Time (local time): Wed Oct 28 16:47:35 EDT 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger1002158/GCN5_download_cron
======================================================================
Trigger: 01002158 Segment: 000
BAT Trigger Time: 625453690.048 [s; MET]
Trigger Stop: 625453691.072 [s; MET]
UTC: 2020-10-27T01:07:44.172880 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 155.974362541719 Dec: -5.51493711208005 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.12
Image Trigger?: NO
Rate S/N Ratio: 15.3948043183407 [ if not an image trigger ]
Image S/N Ratio: 8.12
Flight Position: [ source = BAT ]
RA: 155.974362541719 Dec: -5.51493711208005 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 155.954119254067 Dec: -5.49910003649932 [deg; J2000]
{ 10h 23m 49.0s , -05d 29' 56.8" }
+/- 1.87937020732886 [arcmin] (estimated 90% radius based on SNR)
+/- 0.859167334205116 [arcmin] (formal 1-sigma fit error)
SNR: 12.3501485936888
Angular difference between Flight and Ground position is 1.537721 arcmin
Partial Coding Fraction: 0.4453125 [ including projection effects ]
Duration
T90: 546.731999993324 +/- 420.946579212314
Measured from: 388.520000100136
to: 935.25200009346 [s; relative to TRIGTIME]
T50: 295.184000015259 +/- 589.558906652106
Measured from: 554.852000117302
to: 850.036000132561 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.287999987602234
to: 0.712000012397766 [s; relative to TRIGTIME]
Total Fluence
Measured from: -3.86800003051758
to: 960.832000017166 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total -0.116368 0.189957 -0.125273 -0.134129
0.185531 0.190547 0.164444 0.143142 [error]
Peak 0.057714 0.048622 0.064638 0.009782
0.009914 0.010863 0.009640 0.007349 [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 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 3.29e-08 3.54e-08 4.45e-08 1.18e-06 1.26e-07 1.19e-06 erg/cm2
Peak flux Power-law 4.64e-01 4.73e-01 3.39e-01 3.88e-01 1.43e+00 1.66e+00 ph/cm2/s
Error 1.36e-01 8.79e-02 7.61e-02 1.75e-01 2.54e-01 2.99e-01 ph/cm2/s
Fluence Cutoff-PL 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 3.95e-08 1.18e-07 1.19e-07 -------- 1.98e-07 2.56e-06 erg/cm2
Peak flux Cutoff-PL 4.14e-01 4.98e-01 3.61e-01 2.25e-01 1.40e+00 1.50e+00 ph/cm2/s
Error 1.70e-01 1.03e-01 9.16e-02 2.25e-01 2.60e-01 3.70e-01 ph/cm2/s
Fluence Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error -------- 1.06e-07 -------- -------- -------- -------- erg/cm2
Peak flux Band 4.21e-01 4.94e-01 3.60e-01 2.46e-01 1.41e+00 1.52e+00 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 1.500 0.000 - - 0.00e+00 1.40e-05 81.670 0
CPL -9.875 0.000 46.5 0.0 1.70e+01 0.00e+00 80.290 0
The chi2 of BB fit is 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 1.480 0.297 - - 1.15e-02 2.08e-03 58.830 0
CPL 0.910 1.169 100.9 -29.3 2.18e-02 4.85e-02 58.150 0
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: 9.408000 sec.
T50 in the 50-300 keV band: 5.760000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 964.700 -3.868 960.832
T90 546.732 388.520 935.252
T50 295.184 554.852 850.036
Peak 1.000 -0.288 0.712
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
155.9541 -5.4991 0.0156 31.3 -78.6 0.9374 12.4 TRIG_01002158
------------------------------------------
Foreground time interval of the image:
-3.868 14.953 (delta_t = 18.821 [sec])
Background time interval of the image:
-239.048 -56.019 (delta_t = 183.029 [sec])
-55.048 -3.868 (delta_t = 51.180 [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
Multiple GTIs in the spectrum
tstart tstop
-3.868000 54.292000
54.952000 960.832000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.50000 ( -1.5 -1.5 )
Norm@50keV : 0.0 ( 0 2.79238e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 81.67 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 1.77e-02 with 57 degrees of freedom
Photon flux (15-150 keV) in 964 sec: 0.0 ( 0 0.00401361 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 2.51202e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-3.868000 54.292000
54.952000 960.832000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -9.87518 ( )
Epeak [keV] : 46.4915 ( )
Norm@50keV : 16.9783 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared 80.29 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 1.83e-02 with 56 degrees of freedom
Photon flux (15-150 keV) in 964 sec: 0.0 ( 0 0.00635857 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 3.96719e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-3.868000 54.292000
54.952000 960.832000
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.38395 ( 0.98395 0.98395 )
beta : -9.37167 ( 2.5 2.5 )
Epeak [keV] : 45.6609 ( -80 -80 )
Norm@50keV : 3.52589E-02 ( -0.0352677 0.069304 )
------------------------------------------------------------
Photon flux (15-150 keV) in 964 sec: 0.0 ( ) 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] : 5.00000 (-5 -5)
R^2/D10^2 : 0.0 (0 0)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 81.67 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 1.77e-02 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 7.00000 (-7 -7)
Norm : 0.0 (0 0)
------------------------------------------------------------
#Fit statistic : Chi-Squared 81.67 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 1.77e-02 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 0.105584 (-0.105584 -0.105584)
R1^2/D10^2 : 5.52496E-05 (-5.60321e-05 -5.60321e-05)
kT2 [keV] : 11.0670 (-11.0051 -11.0051)
R2^2/D10^2 : 6.18134E-04 (-0.000637443 -0.000637443)
------------------------------------------------------------
#Fit statistic : Chi-Squared 81.27 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 1.22e-02 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Peak spectrum fit
Power-law model
Time interval is from -0.288 sec. to 0.712 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.47994 ( -0.292462 0.301697 )
Norm@50keV : 1.15017E-02 ( -0.0020921 0.00206926 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 58.83 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 4.08e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 1.42826 ( -0.253707 0.254009 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.09478e-07 ( -2.16422e-08 2.19109e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.288 sec. to 0.712 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.910095 ( -1.50846 0.828536 )
Epeak [keV] : 100.865 ( -42.1617 -100.817 )
Norm@50keV : 2.18400E-02 ( -0.0121303 0.0848476 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 58.15 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 3.96e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 1.40158 ( -0.25878 0.26024 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.06949e-07 ( -2.22949e-08 2.2617e-08 ) ergs/cm2
Band function
Time interval is from -0.288 sec. to 0.712 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.901532 ( -0.604287 1.32081 )
beta : -9.37162 ( 9.36846 19.3685 )
Epeak [keV] : 99.9779 ( -39.0846 -99.9903 )
Norm@50keV : 2.20674E-02 ( -0.0118157 0.0218448 )
------------------------------------------------------------
Photon flux (15-150 keV) in 1 sec: 1.40774 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.07724e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 16.8409 (-3.08759 3.84275)
R^2/D10^2 : 0.113528 (-0.0580462 0.114204)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 63.25 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 2.65e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.574e-09 2.576e-09
25- 50 2.887e-08 8.550e-09
50-150 5.828e-08 2.073e-08
15-150 9.373e-08 2.765e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.361 (-93.968 -199.362)
Norm : 5.88582 (-1.02794 1.0292)
------------------------------------------------------------
#Fit statistic : Chi-Squared 58.59 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 4.17e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.466e-08 8.560e-09
25- 50 2.819e-08 1.605e-08
50-150 6.183e-08 3.559e-08
15-150 1.047e-07 5.985e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.57899 (-1.43352 2.4513)
R1^2/D10^2 : 19.8893 (-18.4166 404.404)
kT2 [keV] : 20.0393 (-4.04328 6.00037)
R2^2/D10^2 : 5.69259E-02 (-0.0345235 0.0626677)
------------------------------------------------------------
#Fit statistic : Chi-Squared 54.61 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 4.89e-01 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.468e-08 7.939e-09
25- 50 2.463e-08 1.141e-08
50-150 6.542e-08 3.261e-08
15-150 1.047e-07 4.962e-08
Plot creation:
Wed Oct 28 16:50:49 EDT 2020