batgrbproduct analysis for trigger=995288
batgrbproduct Analysis for Trigger=995288
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): Thu Sep 10 21:28:22 EDT 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger995288/GCN5_download_cron
======================================================================
Trigger: 00995288 Segment: 000
BAT Trigger Time: 621386256.064 [s; MET]
Trigger Stop: 621386257.088 [s; MET]
UTC: 2020-09-09T23:17:10.456620 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 175.17575805061 Dec: -31.1790605147067 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.51
Image Trigger?: NO
Rate S/N Ratio: 13.1529464379659 [ if not an image trigger ]
Image S/N Ratio: 7.51
Flight Position: [ source = BAT ]
RA: 175.17575805061 Dec: -31.1790605147067 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 175.174217788193 Dec: -31.2020984721464 [deg; J2000]
{ 11h 40m 41.8s , -31d 12' 07.6" }
+/- 1.40516339220341 [arcmin] (estimated 90% radius based on SNR)
+/- 0.454602629527499 [arcmin] (formal 1-sigma fit error)
SNR: 18.7102700520486
Angular difference between Flight and Ground position is 1.384536 arcmin
Partial Coding Fraction: 0.359375 [ including projection effects ]
Duration
T90: 13.7119998931885 +/- 2.17649719465861
Measured from: -4.83599984645844
to: 8.87600004673004 [s; relative to TRIGTIME]
T50: 5.55599999427795 +/- 1.28869082442696
Measured from: -1.45199990272522
to: 4.10400009155273 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.388000011444092
to: 0.611999988555908 [s; relative to TRIGTIME]
Total Fluence
Measured from: -5.60000002384186
to: 10.3559999465942 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.474114 0.607042 0.512077 0.126306
0.045325 0.048401 0.042704 0.035234 [error]
Peak 0.035971 0.041401 0.068167 0.022734
0.011579 0.012749 0.011764 0.008974 [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 1.61e-07 2.83e-07 3.81e-07 1.05e-06 1.11e-06 1.88e-06 erg/cm2
Error 2.15e-08 2.40e-08 4.14e-08 2.38e-07 1.01e-07 2.73e-07 erg/cm2
Peak flux Power-law 3.81e-01 4.15e-01 3.22e-01 4.09e-01 1.27e+00 1.53e+00 ph/cm2/s
Error 1.62e-01 1.12e-01 9.12e-02 2.36e-01 3.14e-01 3.73e-01 ph/cm2/s
Fluence Cutoff-PL 1.45e-07 3.05e-07 3.97e-07 4.32e-07 1.06e-06 1.28e-06 erg/cm2
Error 2.52e-08 3.03e-08 4.66e-08 -------- 1.08e-07 3.44e-07 erg/cm2
Peak flux Cutoff-PL 3.25e-01 4.29e-01 3.51e-01 2.58e-01 1.24e+00 1.36e+00 ph/cm2/s
Error 2.69e-01 1.23e-01 1.23e-01 3.06e-01 3.23e-01 4.55e-01 ph/cm2/s
Fluence Band 1.44e-07 3.04e-07 3.97e-07 4.33e-07 1.06e-06 1.28e-06 erg/cm2
Error 2.47e-08 -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 3.40e-01 4.28e-01 3.45e-01 2.86e-01 1.26e+00 1.40e+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 1.573 0.137 - - 7.39e-03 6.25e-04 62.660 57
CPL 0.911 0.587 81.4 76.4 1.61e-02 1.23e-02 58.280 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.367 0.404 - - 1.05e-02 2.53e-03 53.840 57
CPL 0.764 2.061 120.3 0.0 1.95e-02 7.51e-02 53.440 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: 17.152000 sec.
T50 in the 50-300 keV band: 8.192000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 15.956 -5.600 10.356
T90 13.712 -4.836 8.876
T50 5.556 -1.452 4.104
Peak 1.000 -0.388 0.612
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
175.1742 -31.2021 0.0103 37.5 -48.2 1.8280 18.7 TRIG_00995288
------------------------------------------
Foreground time interval of the image:
-5.600 10.356 (delta_t = 15.956 [sec])
Background time interval of the image:
-239.064 -66.404 (delta_t = 172.660 [sec])
-65.064 -63.384 (delta_t = 1.680 [sec])
-62.064 -5.600 (delta_t = 56.464 [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 -5.600 sec. to 10.356 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.57262 ( -0.136049 0.137643 )
Norm@50keV : 7.38966E-03 ( -0.000626921 0.000623869 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.66 using 59 PHA bins.
# Reduced chi-squared = 1.099 for 57 degrees of freedom
# Null hypothesis probability = 2.825799e-01
Photon flux (15-150 keV) in 15.96 sec: 0.941726 ( -0.0787372 0.0788344 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.10683e-06 ( -1.00473e-07 1.01131e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -5.600 sec. to 10.356 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.910848 ( -0.627032 0.547318 )
Epeak [keV] : 81.3827 ( -19.4218 133.437 )
Norm@50keV : 1.61358E-02 ( -0.00752585 0.0169764 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.28 using 59 PHA bins.
# Reduced chi-squared = 1.041 for 56 degrees of freedom
# Null hypothesis probability = 3.915734e-01
Photon flux (15-150 keV) in 15.96 sec: 0.919126 ( -0.081143 0.081074 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.06132e-06 ( -1.07843e-07 1.08432e-07 ) ergs/cm2
Band function
Time interval is from -5.600 sec. to 10.356 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.910799 ( -0.486785 0.64041 )
beta : -10.0000 ( 10 20 )
Epeak [keV] : 81.3670 ( -16.5134 133.105 )
Norm@50keV : 1.61357E-02 ( -0.00753651 0.0169882 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.28 using 59 PHA bins.
# Reduced chi-squared = 1.060 for 55 degrees of freedom
# Null hypothesis probability = 3.557513e-01
Photon flux (15-150 keV) in 15.96 sec: 0.921030 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.06064e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.6063 (-1.38315 1.54125)
R^2/D10^2 : 0.117984 (-0.0355769 0.0504122)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 84.77 using 59 PHA bins.
# Reduced chi-squared = 1.487 for 57 degrees of freedom
# Null hypothesis probability = 9.924193e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.445e-08 1.195e-08
25- 50 3.273e-07 3.583e-08
50-150 4.694e-07 7.685e-08
15-150 8.812e-07 9.329e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 184.833 (-61.2745 -183.761)
Norm : 3.86487 (-0.328733 0.374073)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.35 using 59 PHA bins.
# Reduced chi-squared = 1.041 for 57 degrees of freedom
# Null hypothesis probability = 3.898440e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.551e-07 5.232e-08
25- 50 2.956e-07 1.116e-07
50-150 6.318e-07 3.175e-07
15-150 1.082e-06 4.885e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.84452 (-1.45215 2.08508)
R1^2/D10^2 : 1.66481 (-1.06468 3.29923)
kT2 [keV] : 20.7779 (-3.3495 5.90538)
R2^2/D10^2 : 2.75612E-02 (-0.0173245 0.0225352)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.97 using 59 PHA bins.
# Reduced chi-squared = 1.036 for 55 degrees of freedom
# Null hypothesis probability = 4.014773e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.521e-07 6.802e-08
25- 50 2.932e-07 8.511e-08
50-150 6.005e-07 1.974e-07
15-150 1.046e-06 3.061e-07
Peak spectrum fit
Power-law model
Time interval is from -0.388 sec. to 0.612 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.36717 ( -0.399498 0.409344 )
Norm@50keV : 1.05084E-02 ( -0.00252799 0.0025231 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.84 using 59 PHA bins.
# Reduced chi-squared = 0.9446 for 57 degrees of freedom
# Null hypothesis probability = 5.943458e-01
Photon flux (15-150 keV) in 1 sec: 1.27052 ( -0.313793 0.314798 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.02245e-07 ( -2.66405e-08 2.68314e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.388 sec. to 0.612 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.764359 ( -2.45491 1.66788 )
Epeak [keV] : 120.324 ( -120.478 -120.478 )
Norm@50keV : 1.94645E-02 ( -0.0112201 0.138905 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.44 using 59 PHA bins.
# Reduced chi-squared = 0.9542 for 56 degrees of freedom
# Null hypothesis probability = 5.725338e-01
Photon flux (15-150 keV) in 1 sec: 1.24363 ( -0.331416 0.31396 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.01671e-07 ( -2.66721e-08 2.6936e-08 ) ergs/cm2
Band function
Time interval is from -0.388 sec. to 0.612 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.840420 ( -0.781322 2.52 )
beta : -9.37138 ( 9.37164 19.3716 )
Epeak [keV] : 130.002 ( -64.9124 -129.992 )
Norm@50keV : 1.79833E-02 ( -0.00975993 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.44 using 59 PHA bins.
# Reduced chi-squared = 0.9717 for 55 degrees of freedom
# Null hypothesis probability = 5.343578e-01
Photon flux (15-150 keV) in 1 sec: 1.25622 ( ) 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] : 20.3202 (-4.50268 6.14763)
R^2/D10^2 : 5.63245E-02 (-0.0335581 0.0739719)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.44 using 59 PHA bins.
# Reduced chi-squared = 0.9727 for 57 degrees of freedom
# Null hypothesis probability = 5.336810e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.455e-09 2.438e-09
25- 50 2.242e-08 9.380e-09
50-150 6.878e-08 3.211e-08
15-150 9.566e-08 4.495e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.362 (-96.1547 -199.363)
Norm : 5.29491 (-1.27425 1.27746)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.43 using 59 PHA bins.
# Reduced chi-squared = 0.9550 for 57 degrees of freedom
# Null hypothesis probability = 5.719828e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.319e-08 7.890e-09
25- 50 2.536e-08 1.503e-08
50-150 5.562e-08 3.203e-08
15-150 9.417e-08 5.640e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.23189E-02 (0.822496 -0.0823189)
R1^2/D10^2 : 1.90221E+18 (-1.90221e+18 -1.90221e+18)
kT2 [keV] : 20.3200 (-4.5025 6.14781)
R2^2/D10^2 : 5.63262E-02 (-0.0335597 0.0739704)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.44 using 59 PHA bins.
# Reduced chi-squared = 1.008 for 55 degrees of freedom
# Null hypothesis probability = 4.579032e-01
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
Plot creation:
Thu Sep 10 21:32:15 EDT 2020