batgrbproduct analysis for trigger=1071488
batgrbproduct Analysis for Trigger=1071488
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 2 19:46:38 EDT 2021
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1071488/GCN5_download_cron
======================================================================
Trigger: 01071488 Segment: 000
BAT Trigger Time: 652201504 [s; MET]
Trigger Stop: 652201568 [s; MET]
UTC: 2021-09-01T15:04:36.348320 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 295.292036577501 Dec: -76.9321674594354 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.87
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 10.87
Flight Position: [ source = BAT ]
RA: 295.292036577501 Dec: -76.9321674594354 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 295.223996683909 Dec: -76.9421909970833 [deg; J2000]
{ 19h 40m 53.8s , -76d 56' 31.9" }
+/- 1.87390108622129 [arcmin] (estimated 90% radius based on SNR)
+/- 0.86004631288035 [arcmin] (formal 1-sigma fit error)
SNR: 12.4016734033911
Angular difference between Flight and Ground position is 1.101395 arcmin
Partial Coding Fraction: 0.1201172 [ including projection effects ]
Duration
T90: 46.7680000066757 +/- 7.87291048753113
Measured from: 31.1920001506805
to: 77.9600001573563 [s; relative to TRIGTIME]
T50: 23.055999994278 +/- 6.03641215973587
Measured from: 40.0720001459122
to: 63.1280001401901 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 60.6360000371933
to: 61.6360000371933 [s; relative to TRIGTIME]
Total Fluence
Measured from: 29.7680000066757
to: 84.6959999799728 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.722153 2.140627 1.037479 0.300806
0.157405 0.162924 0.143290 0.131392 [error]
Peak 0.062435 0.171069 0.048480 0.043061
0.022827 0.026909 0.020354 0.018937 [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 7.27e-07 9.40e-07 8.90e-07 1.49e-06 3.05e-06 4.04e-06 erg/cm2
Error 9.64e-08 8.75e-08 1.40e-07 4.61e-07 3.27e-07 6.19e-07 erg/cm2
Peak flux Power-law 1.06e+00 7.96e-01 3.98e-01 2.84e-01 2.39e+00 2.54e+00 ph/cm2/s
Error 3.74e-01 2.11e-01 1.38e-01 1.73e-01 6.43e-01 6.72e-01 ph/cm2/s
Fluence Cutoff-PL 6.84e-07 1.02e-06 8.58e-07 4.74e-07 2.86e-06 3.04e-06 erg/cm2
Error 1.07e-07 1.23e-07 1.70e-07 7.45e-07 3.77e-07 7.94e-07 erg/cm2
Peak flux Cutoff-PL 8.38e-01 1.38e+00 2.12e-01 5.74e-04 2.44e+00 2.43e+00 ph/cm2/s
Error 4.11e-01 4.39e-01 2.63e-01 3.48e-02 6.29e-01 6.31e-01 ph/cm2/s
Fluence Band 6.53e-07 1.06e-06 8.07e-07 9.49e-07 2.89e-06 3.48e-06 erg/cm2
Error 1.14e-07 1.30e-07 1.64e-07 -------- 3.49e-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 2.080 0.173 - - 6.00e-03 6.92e-04 51.330 57
CPL 1.369 0.711 36.8 0.0 1.55e-02 0.00e+00 48.500 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.002 0.371 - - 1.59e-02 4.59e-03 67.490 57
CPL -3.678 0.269 35.7 9.0 6.11e+01 6.79e+05 58.640 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: 8.000000 sec.
T50 in the 50-300 keV band: 3.584000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 54.928 29.768 84.696
T90 46.768 31.192 77.960
T50 23.056 40.072 63.128
Peak 1.000 60.636 61.636
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
295.2240 -76.9422 0.0155 47.2 -44.7 4.1114 12.4 TRIG_01071488
------------------------------------------
Foreground time interval of the image:
29.768 72.501 (delta_t = 42.733 [sec])
Background time interval of the image:
-144.699 -81.390 (delta_t = 63.309 [sec])
-80.000 29.768 (delta_t = 109.768 [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 29.768 sec. to 84.696 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.07998 ( -0.168941 0.177416 )
Norm@50keV : 5.99702E-03 ( -0.000699015 0.000685591 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.33 using 59 PHA bins.
# Reduced chi-squared = 0.9005 for 57 degrees of freedom
# Null hypothesis probability = 6.867552e-01
Photon flux (15-150 keV) in 54.93 sec: 0.934272 ( -0.0876657 0.087741 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.05497e-06 ( -3.24575e-07 3.29111e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 29.768 sec. to 84.696 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.36881 ( -0.921445 0.500512 )
Epeak [keV] : 36.7597 ( )
Norm@50keV : 1.54881E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.50 using 59 PHA bins.
# Reduced chi-squared = 0.8661 for 56 degrees of freedom
# Null hypothesis probability = 7.513875e-01
Photon flux (15-150 keV) in 54.93 sec: 0.909853 ( -0.091221 0.091127 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.86151e-06 ( -3.72211e-07 3.82186e-07 ) ergs/cm2
Band function
Time interval is from 29.768 sec. to 84.696 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.196361 ( -1.88169 -0.195332 )
beta : -2.45356 ( 2.45362 0.360914 )
Epeak [keV] : 31.2252 ( -9.27107 10.6368 )
Norm@50keV : 0.185174 ( -0.18428 413.432 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.23 using 59 PHA bins.
# Reduced chi-squared = 0.8406 for 55 degrees of freedom
# Null hypothesis probability = 7.939671e-01
Photon flux (15-150 keV) in 54.93 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.89493e-06 ( -2.89454e-06 -3.47844e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 9.31833 (-0.950804 1.07609)
R^2/D10^2 : 0.565487 (-0.198392 0.300888)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.16 using 59 PHA bins.
# Reduced chi-squared = 1.143 for 57 degrees of freedom
# Null hypothesis probability = 2.141764e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.341e-07 8.564e-08
25- 50 1.198e-06 1.338e-07
50-150 5.076e-07 1.330e-07
15-150 2.239e-06 2.678e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 58.4784 (-13.807 20.2826)
Norm : 4.94848 (-0.761268 0.877281)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.803e-07 8.597e-08
25- 50 1.027e-06 1.008e-07
50-150 1.144e-06 2.810e-07
15-150 2.851e-06 3.288e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.61790 (-1.6044 1.49919)
R1^2/D10^2 : 1.64379 (-0.623779 1.49616)
kT2 [keV] : 21.3902 (-8.89852 24.2041)
R2^2/D10^2 : 1.17753E-02 (-0.00583184 0.0305108)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.525e-07 3.451e-07
25- 50 1.020e-06 4.492e-07
50-150 1.083e-06 6.369e-07
15-150 2.756e-06 1.319e-06
Peak spectrum fit
Power-law model
Time interval is from 60.636 sec. to 61.636 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.00189 ( -0.357435 0.384748 )
Norm@50keV : 1.59196E-02 ( -0.00462469 0.0045617 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.49 using 59 PHA bins.
# Reduced chi-squared = 1.184 for 57 degrees of freedom
# Null hypothesis probability = 1.611068e-01
Photon flux (15-150 keV) in 1 sec: 2.38951 ( -0.641648 0.643847 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.4689e-07 ( -4.08989e-08 4.15007e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 60.636 sec. to 61.636 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -3.67817 ( 2.5238 3.06262 )
Epeak [keV] : 35.6761 ( -6.95491 11.0483 )
Norm@50keV : 61.0635 ( -61.7376 1.35798e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.64 using 59 PHA bins.
# Reduced chi-squared = 1.047 for 56 degrees of freedom
# Null hypothesis probability = 3.788630e-01
Photon flux (15-150 keV) in 1 sec: 2.43510 ( -0.62213 0.63596 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.24891e-07 ( -3.58991e-08 4.1085e-08 ) ergs/cm2
Band function
Time interval is from 60.636 sec. to 61.636 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -3.61103 -5 )
beta : -3.26680 ( -3.57924 0.853162 )
Epeak [keV] : 32.4293 ( -5.56228 5.64066 )
Norm@50keV : 681.967 ( -157.606 1543.55 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.57 using 59 PHA bins.
# Reduced chi-squared = 1.010 for 55 degrees of freedom
# Null hypothesis probability = 4.530758e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.47087e-07 ( -1.4708e-07 -3.9423e-08 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 9.71116 (-1.78103 2.31934)
R^2/D10^2 : 1.53622 (-0.905988 1.86722)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.919e-08 1.177e-08
25- 50 6.959e-08 3.015e-08
50-150 3.335e-08 1.813e-08
15-150 1.321e-07 6.090e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 60.6397 (-24.7004 58.49)
Norm : 13.4579 (-4.53037 5.93316)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.388e-08 1.182e-08
25- 50 5.173e-08 1.632e-08
50-150 5.938e-08 3.762e-08
15-150 1.450e-07 5.476e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 22.3437 (-22.912 -22.912)
R1^2/D10^2 : 1.45208E-02 (-0.0139361 0.228216)
kT2 [keV] : 8.68346 (-8.69656 3.00104)
R2^2/D10^2 : 2.05983 (-2.05327 -2.05327)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.114e-08 2.264e-08
25- 50 6.629e-08 4.918e-08
50-150 4.646e-08 3.899e-08
15-150 1.439e-07 1.086e-07
Plot creation:
Thu Sep 2 19:53:30 EDT 2021