batgrbproduct analysis for trigger=994165
batgrbproduct Analysis for Trigger=994165
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 Sep 2 11:09:24 EDT 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger994165/GCN5_download_cron
======================================================================
Trigger: 00994165 Segment: 000
BAT Trigger Time: 620636992 [s; MET]
Trigger Stop: 620637096 [s; MET]
UTC: 2020-09-01T07:09:26.441920 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 217.879251310693 Dec: -38.7163321024524 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.77
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.77
Flight Position: [ source = BAT ]
RA: 217.879251310693 Dec: -38.7163321024524 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 217.86179713475 Dec: -38.7068521197061 [deg; J2000]
{ 14h 31m 26.8s , -38d 42' 24.7" }
+/- 2.95581463218076 [arcmin] (estimated 90% radius based on SNR)
+/- 1.8104225462791 [arcmin] (formal 1-sigma fit error)
SNR: 6.46729077387196
Angular difference between Flight and Ground position is 0.995643 arcmin
Partial Coding Fraction: 0.8203125 [ including projection effects ]
Duration
T90: 692.620000004768 +/- 130.325513809525
Measured from: 51.336000084877
to: 743.956000089645 [s; relative to TRIGTIME]
T50: 271.875999927521 +/- 85.9799982991321
Measured from: 158.512000083923
to: 430.388000011444 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 68.62399995327
to: 69.62399995327 [s; relative to TRIGTIME]
Total Fluence
Measured from: 32.1399999856949
to: 803.631999969482 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.858006 3.223300 1.735444 0.294135
0.195295 0.178691 0.148818 0.127500 [error]
Peak 0.027905 0.006016 0.014390 0.014525
0.006917 0.006961 0.005839 0.004992 [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 9.20e-07 1.30e-06 1.37e-06 2.66e-06 4.43e-06 6.26e-06 erg/cm2
Error 9.66e-08 8.75e-08 1.45e-07 5.76e-07 3.35e-07 7.14e-07 erg/cm2
Peak flux Power-law 1.79e-01 1.31e-01 6.34e-02 4.35e-02 3.94e-01 4.19e-01 ph/cm2/s
Error 1.60e-01 7.34e-02 6.94e-02 4.26e-01 1.62e-01 3.70e-01 ph/cm2/s
Fluence Cutoff-PL 8.11e-07 1.43e-06 1.36e-06 7.54e-07 4.09e-06 4.35e-06 erg/cm2
Error 1.17e-07 1.16e-07 1.65e-07 -------- 3.80e-07 7.00e-07 erg/cm2
Peak flux Cutoff-PL 2.23e-01 1.08e-01 3.13e-02 1.16e-02 3.73e-01 3.74e-01 ph/cm2/s
Error -------- -------- -------- -------- 1.76e-01 4.26e-01 ph/cm2/s
Fluence Band 8.02e-07 1.42e-06 1.35e-06 9.77e-07 4.08e-06 4.57e-06 erg/cm2
Error -------- 1.16e-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 1.927 0.126 - - 6.26e-04 4.81e-05 69.740 57
CPL 1.003 0.615 48.6 10.1 1.97e-03 1.72e-03 61.550 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.002 2.646 - - 2.63e-03 2.12e-03 52.460 57
CPL 2.077 0.891 29.8 0.0 1.59e-03 0.00e+00 50.890 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: 345.984000 sec.
T50 in the 50-300 keV band: 185.472000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 771.492 32.140 803.632
T90 692.620 51.336 743.956
T50 271.876 158.512 430.388
Peak 1.000 68.624 69.624
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
217.8618 -38.7069 0.0297 24.3 27.1 0.8340 6.5 TRIG_00994165
------------------------------------------
Foreground time interval of the image:
32.140 113.401 (delta_t = 81.261 [sec])
Background time interval of the image:
-239.000 32.140 (delta_t = 271.140 [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
32.140000 212.770000
214.000000 803.632000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.92668 ( -0.124373 0.127541 )
Norm@50keV : 6.25546E-04 ( -4.84034e-05 4.78643e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.74 using 59 PHA bins.
# Reduced chi-squared = 1.223 for 57 degrees of freedom
# Null hypothesis probability = 1.199044e-01
Photon flux (15-150 keV) in 770.3 sec: 9.08064E-02 ( -0.00625458 0.00626659 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.43177e-06 ( -3.33743e-07 3.3703e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
32.140000 212.770000
214.000000 803.632000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00273 ( -0.658836 0.57213 )
Epeak [keV] : 48.5660 ( -7.62261 12.6018 )
Norm@50keV : 1.97236E-03 ( -0.000989114 0.00245275 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.55 using 59 PHA bins.
# Reduced chi-squared = 1.099 for 56 degrees of freedom
# Null hypothesis probability = 2.842577e-01
Photon flux (15-150 keV) in 770.3 sec: 8.63185E-02 ( -0.0067887 0.0067987 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.0855e-06 ( -3.7338e-07 3.8716e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
32.140000 212.770000
214.000000 803.632000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.01760 ( -0.556864 0.64893 )
beta : -9.37054 ( 9.3715 19.3715 )
Epeak [keV] : 48.7361 ( -7.49361 9.38643 )
Norm@50keV : 1.93295E-03 ( -0.000929348 0.000527614 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.55 using 59 PHA bins.
# Reduced chi-squared = 1.119 for 55 degrees of freedom
# Null hypothesis probability = 2.532693e-01
Photon flux (15-150 keV) in 770.3 sec: 8.63887E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.08413e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.5991 (-0.852087 0.921099)
R^2/D10^2 : 2.39356E-02 (-0.00606562 0.00810237)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 88.94 using 59 PHA bins.
# Reduced chi-squared = 1.560 for 57 degrees of freedom
# Null hypothesis probability = 4.330661e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.228e-07 6.652e-08
25- 50 1.580e-06 1.306e-07
50-150 1.248e-06 1.957e-07
15-150 3.351e-06 2.723e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 78.1370 (-15.1862 21.7182)
Norm : 0.426822 (-0.0443477 0.050679)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.34 using 59 PHA bins.
# Reduced chi-squared = 1.094 for 57 degrees of freedom
# Null hypothesis probability = 2.920938e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.518e-07 8.450e-08
25- 50 1.394e-06 9.167e-08
50-150 1.937e-06 3.324e-07
15-150 4.183e-06 3.936e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.77657 (-1.09505 1.69887)
R1^2/D10^2 : 1.01791 (-0.809431 5.16524)
kT2 [keV] : 14.2421 (-1.60182 2.45526)
R2^2/D10^2 : 9.71916E-03 (-0.00490991 0.00483427)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.04 using 59 PHA bins.
# Reduced chi-squared = 1.092 for 55 degrees of freedom
# Null hypothesis probability = 2.982405e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.563e-07 3.440e-07
25- 50 1.375e-06 2.777e-07
50-150 1.633e-06 3.543e-07
15-150 3.864e-06 6.983e-07
Peak spectrum fit
Power-law model
Time interval is from 68.624 sec. to 69.624 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.00192 ( -2.85488 2.43807 )
Norm@50keV : 2.62681E-03 ( -0.00258758 0.0016549 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.46 using 59 PHA bins.
# Reduced chi-squared = 0.9203 for 57 degrees of freedom
# Null hypothesis probability = 6.460044e-01
Photon flux (15-150 keV) in 1 sec: 0.394350 ( -0.162305 0.162271 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.37909e-08 ( -2.36951e-08 1.97886e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 68.624 sec. to 69.624 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.07662 ( -0.666716 1.11617 )
Epeak [keV] : 29.8315 ( )
Norm@50keV : 1.58679E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.89 using 59 PHA bins.
# Reduced chi-squared = 0.9087 for 56 degrees of freedom
# Null hypothesis probability = 6.682516e-01
Photon flux (15-150 keV) in 1 sec: 0.372549 0.391794 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.54832e-08 ( -2.54832e-08 1.11503e-08 ) ergs/cm2
Band function
Time interval is from 68.624 sec. to 69.624 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.44310 ( 1.45251 1.45251 )
beta : -1.96761 ( 2.00561 2.00561 )
Epeak [keV] : 15.2788 ( -13.6234 -13.6234 )
Norm@50keV : 8.65511E-03 ( -0.00922401 0.567246 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.46 using 59 PHA bins.
# Reduced chi-squared = 0.9539 for 55 degrees of freedom
# Null hypothesis probability = 5.721746e-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] : 4.26082 (-1.62395 2.24937)
R^2/D10^2 : 6.28250 (-6.2825 75.0035)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.60 using 59 PHA bins.
# Reduced chi-squared = 0.9404 for 57 degrees of freedom
# Null hypothesis probability = 6.033510e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.696e-09 4.572e-09
25- 50 3.315e-09 2.262e-09
50-150 5.831e-11 7.695e-11
15-150 1.107e-08 7.650e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.6779 (-6.78641 -11.6779)
Norm : 8.42629 (-8.42629 49.6575)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.85 using 59 PHA bins.
# Reduced chi-squared = 0.9447 for 57 degrees of freedom
# Null hypothesis probability = 5.940171e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.289e-09 4.393e-09
25- 50 3.818e-09 2.700e-09
50-150 3.899e-10 4.320e-10
15-150 1.150e-08 7.605e-09
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.89165 (-1.51439 1.29103)
R1^2/D10^2 : 8.75641 (-7.97148 68.4527)
kT2 [keV] : 198.448 (-198.345 -198.345)
R2^2/D10^2 : 1.00442E-04 (-5.13527e-05 0.00172056)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.67 using 59 PHA bins.
# Reduced chi-squared = 0.7576 for 55 degrees of freedom
# Null hypothesis probability = 9.076354e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.089e-09 4.501e-09
25- 50 3.409e-09 2.544e-09
50-150 2.646e-08 2.882e-08
15-150 3.696e-08 2.300e-08
Plot creation:
Wed Sep 2 11:13:31 EDT 2020