batgrbproduct analysis for trigger=1059881
batgrbproduct Analysis for Trigger=1059881
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): Tue Jul 13 11:11:37 EDT 2021
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1059881/GCN5_download_cron
======================================================================
Trigger: 01059881 Segment: 000
BAT Trigger Time: 647775819.264 [s; MET]
Trigger Stop: 647775820.288 [s; MET]
UTC: 2021-07-12T09:43:11.908060 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 97.3371382959892 Dec: -35.3927995898211 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 13.19
Image Trigger?: NO
Rate S/N Ratio: 25.4950975679639 [ if not an image trigger ]
Image S/N Ratio: 13.19
Flight Position: [ source = BAT ]
RA: 97.3371382959892 Dec: -35.3927995898211 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 97.3220997571764 Dec: -35.3756016919049 [deg; J2000]
{ 06h 29m 17.3s , -35d 22' 32.2" }
+/- 1.66583522413682 [arcmin] (estimated 90% radius based on SNR)
+/- 0.630383139861331 [arcmin] (formal 1-sigma fit error)
SNR: 14.6724006851894
Angular difference between Flight and Ground position is 1.267255 arcmin
Partial Coding Fraction: 0.7109375 [ including projection effects ]
Duration
T90: 136.407999992371 +/- 63.5773067264535
Measured from: -34.595999956131
to: 101.81200003624 [s; relative to TRIGTIME]
T50: 52.2799998521805 +/- 2.94100107022538
Measured from: 2.4080001115799
to: 54.6879999637604 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.0879999399185181
to: 1.08799993991852 [s; relative to TRIGTIME]
Total Fluence
Measured from: -39.7600001096725
to: 174.179999947548 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.811701 2.338952 1.178573 0.273905
0.111561 0.113521 0.096311 0.087880 [error]
Peak 0.060396 0.107428 0.083959 0.025567
0.009915 0.010974 0.009912 0.007823 [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 6.33e-07 9.43e-07 1.05e-06 2.21e-06 3.29e-06 4.83e-06 erg/cm2
Error 5.91e-08 5.70e-08 9.57e-08 4.09e-07 2.25e-07 5.01e-07 erg/cm2
Peak flux Power-law 6.41e-01 7.30e-01 5.96e-01 8.15e-01 2.26e+00 2.78e+00 ph/cm2/s
Error 1.30e-01 9.30e-02 7.92e-02 2.21e-01 2.62e-01 3.27e-01 ph/cm2/s
Fluence Cutoff-PL 5.75e-07 1.03e-06 1.03e-06 6.30e-07 3.03e-06 3.27e-06 erg/cm2
Error 6.83e-08 7.84e-08 1.11e-07 4.57e-07 2.62e-07 5.25e-07 erg/cm2
Peak flux Cutoff-PL 5.73e-01 7.75e-01 6.32e-01 4.23e-01 2.22e+00 2.40e+00 ph/cm2/s
Error 1.51e-01 1.09e-01 9.22e-02 3.08e-01 2.68e-01 4.42e-01 ph/cm2/s
Fluence Band 5.50e-07 1.06e-06 9.81e-07 1.30e-06 3.09e-06 3.91e-06 erg/cm2
Error 7.17e-08 8.39e-08 1.09e-07 5.44e-07 2.46e-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 1.846 0.108 - - 1.69e-03 1.14e-04 80.110 57
CPL 1.001 0.534 51.8 11.6 4.98e-03 3.82e-03 70.950 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.291 0.186 - - 1.90e-02 2.15e-03 63.060 57
CPL 0.675 0.776 109.7 -35.4 3.87e-02 4.23e-02 60.910 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: 62.464000 sec.
T50 in the 50-300 keV band: 47.104000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 213.940 -39.760 174.180
T90 136.408 -34.596 101.812
T50 52.280 2.408 54.688
Peak 1.000 0.088 1.088
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
97.3221 -35.3756 0.0131 31.8 -150.8 1.9635 14.7 TRIG_01059881
------------------------------------------
Foreground time interval of the image:
-39.760 -12.934 (delta_t = 26.826 [sec])
-12.264 15.937 (delta_t = 28.201 [sec])
Background time interval of the image:
-239.264 -234.494 (delta_t = 4.770 [sec])
-233.264 -196.724 (delta_t = 36.540 [sec])
-195.264 -111.244 (delta_t = 84.020 [sec])
-110.264 -39.760 (delta_t = 70.504 [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
-39.760000 -12.934000
-12.264000 65.866000
66.736000 66.876000
67.736000 174.180000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.84571 ( -0.107266 0.109094 )
Norm@50keV : 1.69284E-03 ( -0.000114689 0.000113715 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 80.11 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 2.35e-02 with 57 degrees of freedom
Photon flux (15-150 keV) in 211.5 sec: 0.237533 ( -0.0146076 0.0146234 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.29227e-06 ( -2.23621e-07 2.25451e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-39.760000 -12.934000
-12.264000 65.866000
66.736000 66.876000
67.736000 174.180000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00147 ( -0.571203 0.496595 )
Epeak [keV] : 51.7767 ( -7.37961 15.7904 )
Norm@50keV : 4.97859E-03 ( -0.00230865 0.00532142 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 70.95 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 8.61e-02 with 56 degrees of freedom
Photon flux (15-150 keV) in 211.5 sec: 0.228564 ( -0.015475 0.015468 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.0338e-06 ( -2.58601e-07 2.65411e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-39.760000 -12.934000
-12.264000 65.866000
66.736000 66.876000
67.736000 174.180000
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.428505 ( -0.760768 1.63147 )
beta : -2.32008 ( -0.816094 0.294188 )
Epeak [keV] : 42.9563 ( -10.7095 11.6559 )
Norm@50keV : 1.16554E-02 ( -0.0136011 0.167119 )
------------------------------------------------------------
Photon flux (15-150 keV) in 211.5 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.08591e-06 ( -3.08443e-06 -2.45594e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.2105 (-0.741564 0.803966)
R^2/D10^2 : 7.30229E-02 (-0.0170305 0.0218894)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 105.58 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 9.74e-05 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.070e-07 4.315e-08
25- 50 1.179e-06 8.460e-08
50-150 8.490e-07 1.192e-07
15-150 2.435e-06 1.660e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 87.3489 (-16.3889 23.3225)
Norm : 1.08793 (-0.0961511 0.109628)
------------------------------------------------------------
#Fit statistic : Chi-Squared 71.74 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 9.05e-02 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.998e-07 5.827e-08
25- 50 1.008e-06 6.419e-08
50-150 1.506e-06 4.632e-07
15-150 3.114e-06 4.494e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.95382 (-1.59928 1.34662)
R1^2/D10^2 : 0.200056 (-0.0759525 0.101295)
kT2 [keV] : 26.0919 (-8.0345 20.3692)
R2^2/D10^2 : 1.80250E-03 (-0.00152776 0.00644401)
------------------------------------------------------------
#Fit statistic : Chi-Squared 69.83 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 8.59e-02 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.260e-07 8.820e-08
25- 50 1.090e-06 2.272e-07
50-150 1.495e-06 6.478e-07
15-150 3.111e-06 8.363e-07
Peak spectrum fit
Power-law model
Time interval is from 0.088 sec. to 1.088 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.29146 ( -0.187538 0.185353 )
Norm@50keV : 1.90056E-02 ( -0.00215407 0.00215197 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 63.06 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 2.71e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 2.26388 ( -0.262123 0.26254 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.88201e-07 ( -2.34207e-08 2.36157e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.088 sec. to 1.088 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.675296 ( -0.865255 0.685866 )
Epeak [keV] : 109.743 ( -39.0273 -109.748 )
Norm@50keV : 3.86748E-02 ( -0.0205596 0.0639996 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 60.91 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 3.04e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 2.21865 ( -0.26828 0.26814 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.80586e-07 ( -2.5811e-08 2.5572e-08 ) ergs/cm2
Band function
Time interval is from 0.088 sec. to 1.088 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.97882 ( -2.09493 -4.97882 )
beta : -1.47000 ( -0.31436 0.231804 )
Epeak [keV] : 29.4412 ( -8.03612 6.65878 )
Norm@50keV : 641.749 ( -71.7889 3784.9 )
------------------------------------------------------------
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] : 16.3408 (-2.31098 2.84654)
R^2/D10^2 : 0.202346 (-0.0854016 0.139949)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 73.36 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 7.12e-02 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.112e-08 2.589e-09
25- 50 4.762e-08 7.575e-09
50-150 8.958e-08 2.081e-08
15-150 1.483e-07 2.175e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-40.4142 -200)
Norm : 9.41022 (-1.07244 1.07244)
------------------------------------------------------------
#Fit statistic : Chi-Squared 66.61 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 1.80e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.343e-08 1.311e-08
25- 50 4.507e-08 2.473e-08
50-150 9.885e-08 5.410e-08
15-150 1.673e-07 9.215e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.65495 (-2.89146 3.22911)
R1^2/D10^2 : 0.814516 (-0.452515 1.41048)
kT2 [keV] : 36.2410 (-25.947 157.319)
R2^2/D10^2 : 1.01572E-02 (-0.00987533 0.041925)
------------------------------------------------------------
#Fit statistic : Chi-Squared 58.53 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 3.47e-01 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.711e-08 8.303e-09
25- 50 4.829e-08 2.526e-08
50-150 1.197e-07 6.353e-08
15-150 1.851e-07 8.865e-08
Plot creation:
Tue Jul 13 11:18:29 EDT 2021