batgrbproduct analysis for trigger=994727
batgrbproduct Analysis for Trigger=994727
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): Sun Sep 6 17:15:26 EDT 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger994727/GCN5_download_cron
======================================================================
Trigger: 00994727 Segment: 000
BAT Trigger Time: 620993136.512 [s; MET]
Trigger Stop: 620993140.608 [s; MET]
UTC: 2020-09-05T10:05:10.930480 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 243.044760527211 Dec: -52.7189321845051 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.21
Image Trigger?: NO
Rate S/N Ratio: 12.8452325786651 [ if not an image trigger ]
Image S/N Ratio: 8.21
Flight Position: [ source = BAT ]
RA: 243.044760527211 Dec: -52.7189321845051 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 242.988701474548 Dec: -52.6820110202254 [deg; J2000]
{ 16h 11m 57.3s , -52d 40' 55.2" }
+/- 2.45912275772885 [arcmin] (estimated 90% radius based on SNR)
+/- 1.57055913097378 [arcmin] (formal 1-sigma fit error)
SNR: 8.41125769474047
Angular difference between Flight and Ground position is 3.010293 arcmin
Partial Coding Fraction: 0.5703125 [ including projection effects ]
Duration
T90: 6.15600001811981 +/- 0.792949013830368
Measured from: -0.443999886512756
to: 5.71200013160706 [s; relative to TRIGTIME]
T50: 3.54399991035461 +/- 1.44904932573659
Measured from: 0.976000189781189
to: 4.5200001001358 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.741999983787537
to: 0.258000016212463 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.70799994468689
to: 5.99600005149841 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.382072 0.002994 -0.003418 0.020827
0.030405 0.025355 0.021917 0.021518 [error]
Peak 0.057852 -0.000682 0.006330 0.011959
0.011864 0.009920 0.008417 0.008282 [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 1.18e-07 2.49e-08 2.63e-09 3.05e-10 1.46e-07 1.46e-07 erg/cm2
Error 1.99e-08 1.08e-08 3.06e-09 5.97e-10 2.76e-08 2.77e-08 erg/cm2
Peak flux Power-law 6.13e-01 6.09e-02 2.45e-03 1.03e-04 6.76e-01 6.76e-01 ph/cm2/s
Error 2.27e-01 7.76e-02 9.73e-03 1.42e-03 2.78e-01 2.78e-01 ph/cm2/s
Fluence Cutoff-PL 1.26e-07 1.76e-08 4.66e-11 1.29e-16 1.44e-07 1.44e-07 erg/cm2
Error 2.17e-08 1.20e-08 1.05e-09 4.08e-11 2.49e-08 2.49e-08 erg/cm2
Peak flux Cutoff-PL 6.14e-01 6.03e-02 2.37e-03 9.26e-05 6.74e-01 6.75e-01 ph/cm2/s
Error 2.41e-01 7.75e-02 7.64e-03 1.40e-03 2.80e-01 2.78e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- 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 5.244 0.750 - - 3.55e-04 2.78e-04 53.350 57
CPL 1.000 0.000 50.0 0.0 5.47e-03 0.00e+00 131.280 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 5.633 2.336 - - 2.37e-04 6.62e-04 78.290 57
CPL 1.000 0.000 50.0 0.0 7.78e-03 0.00e+00 94.840 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 6.704 -0.708 5.996
T90 6.156 -0.444 5.712
T50 3.544 0.976 4.520
Peak 1.000 -0.742 0.258
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
242.9887 -52.6820 0.0229 36.9 173.2 0.4255 8.4 TRIG_00994727
------------------------------------------
Foreground time interval of the image:
-0.708 5.996 (delta_t = 6.704 [sec])
Background time interval of the image:
-239.512 -140.012 (delta_t = 99.500 [sec])
-138.512 -0.708 (delta_t = 137.804 [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 -0.708 sec. to 5.996 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 5.24361 ( -0.69008 0.809822 )
Norm@50keV : 3.54556E-04 ( -0.000206893 0.000349455 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.35 using 59 PHA bins.
# Reduced chi-squared = 0.9360 for 57 degrees of freedom
# Null hypothesis probability = 6.128177e-01
Photon flux (15-150 keV) in 6.704 sec: 0.691490 ( -0.118834 0.119005 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.45663e-07 ( -2.72086e-08 2.80014e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.708 sec. to 5.996 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 5.46846E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 131.28 using 59 PHA bins.
# Reduced chi-squared = 2.3443 for 56 degrees of freedom
# Null hypothesis probability = 5.522337e-08
Photon flux (15-150 keV) in 6.704 sec: 0.704463 ( -0.116888 0.11692 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.4382e-07 ( -2.46908e-08 2.51876e-08 ) ergs/cm2
Band function
Time interval is from -0.708 sec. to 5.996 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -8.76344 ( 8.76344 8.76344 )
beta : -5.25936 ( -0.797367 0.703398 )
Epeak [keV] : 2.27143 ( -2.27143 -2.27143 )
Norm@50keV : 4.73848E-02 ( -0.0276097 0.0480186 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.35 using 59 PHA bins.
# Reduced chi-squared = 0.9700 for 55 degrees of freedom
# Null hypothesis probability = 5.378757e-01
Photon flux (15-150 keV) in 6.704 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] : 2.89021 (-0.431677 0.497949)
R^2/D10^2 : 128.252 (-128.252 262.969)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.10 using 59 PHA bins.
# Reduced chi-squared = 0.8789 for 57 degrees of freedom
# Null hypothesis probability = 7.296186e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.270e-07 7.113e-08
25- 50 1.623e-08 9.886e-09
50-150 1.920e-11 2.048e-11
15-150 1.433e-07 7.951e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 5.56206 (-1.21259 1.59969)
Norm : 112.811 (-60.9323 159.103)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.29 using 59 PHA bins.
# Reduced chi-squared = 0.8823 for 57 degrees of freedom
# Null hypothesis probability = 7.230558e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.246e-07 5.691e-08
25- 50 1.985e-08 1.189e-08
50-150 1.715e-10 1.743e-10
15-150 1.446e-07 7.354e-08
Double BB
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.10 using 59 PHA bins.
#Fit statistic : Chi-Squared = 49.93 using 59 PHA bins.
#Fit statistic : Chi-Squared = 49.87 using 59 PHA bins.
#Fit statistic : Chi-Squared = 49.86 using 59 PHA bins.
# Reduced chi-squared = 0.9108 for 55 degrees of freedom
# Reduced chi-squared = 0.9077 for 55 degrees of freedom
# Reduced chi-squared = 0.9068 for 55 degrees of freedom
# Reduced chi-squared = 0.9065 for 55 degrees of freedom
# Null hypothesis probability = 6.621014e-01
# Null hypothesis probability = 6.683680e-01
# Null hypothesis probability = 6.703640e-01
# Null hypothesis probability = 6.709149e-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
Peak spectrum fit
Power-law model
Time interval is from -0.742 sec. to 0.258 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 5.63349 ( -1.71063 2.96079 )
Norm@50keV : 2.36779E-04 ( -0.000236777 0.00108669 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.29 using 59 PHA bins.
# Reduced chi-squared = 1.374 for 57 degrees of freedom
# Null hypothesis probability = 3.215950e-02
Photon flux (15-150 keV) in 1 sec: 0.676309 ( -0.28185 0.274412 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.072e-08 ( -9.62194e-09 1.05717e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.742 sec. to 0.258 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 7.77707E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 94.84 using 59 PHA bins.
# Reduced chi-squared = 1.694 for 56 degrees of freedom
# Null hypothesis probability = 9.171131e-04
Photon flux (15-150 keV) in 1 sec: 0.674198 ( -0.280009 0.280336 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.06296e-08 ( -9.4435e-09 1.0499e-08 ) ergs/cm2
Band function
Time interval is from -0.742 sec. to 0.258 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -8.38749 ( )
beta : -5.33565 ( )
Epeak [keV] : 4.00936 ( )
Norm@50keV : 4.47125E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.36 using 59 PHA bins.
# Reduced chi-squared = 1.425 for 55 degrees of freedom
# Null hypothesis probability = 2.097893e-02
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] : 2.52868 (-1.03954 1.39978)
R^2/D10^2 : 314.340 (-316.475 24730.1)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.95 using 59 PHA bins.
# Reduced chi-squared = 1.385 for 57 degrees of freedom
# Null hypothesis probability = 2.872467e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.873e-08 1.056e-08
25- 50 1.441e-09 9.915e-10
50-150 5.088e-13 6.745e-13
15-150 2.017e-08 1.241e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 4.81923 (-2.50605 4.52184)
Norm : 183.137 (-183.137 5595.28)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.47 using 59 PHA bins.
# Reduced chi-squared = 1.377 for 57 degrees of freedom
# Null hypothesis probability = 3.118872e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.854e-08 1.109e-08
25- 50 2.153e-09 1.529e-09
50-150 9.237e-12 1.256e-11
15-150 2.070e-08 1.288e-08
Double BB
R1^2/D10^2 : 333.084 (-310.01 24273.1)
kT2 [keV] : 199.363 (-199.363 -199.363)
R2^2/D10^2 : 8.95438E-05 (-7.01053e-05 0.00229972)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.16 using 59 PHA bins.
#Fit statistic : Chi-Squared = 74.94 using 59 PHA bins.
#Fit statistic : Chi-Squared = 74.63 using 59 PHA bins.
# Reduced chi-squared = 1.366 for 55 degrees of freedom
# Reduced chi-squared = 1.363 for 55 degrees of freedom
# Reduced chi-squared = 1.357 for 55 degrees of freedom
# Null hypothesis probability = 3.679975e-02
# Null hypothesis probability = 3.815707e-02
# Null hypothesis probability = 4.024503e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.875e-08 1.100e-08
25- 50 3.671e-09 1.975e-09
50-150 2.282e-08 6.745e-09
15-150 4.523e-08 1.431e-08
Plot creation:
Sun Sep 6 17:25:56 EDT 2020