batgrbproduct analysis for trigger=1059460
batgrbproduct Analysis for Trigger=1059460
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): Fri Jul 9 03:24:43 EDT 2021
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1059460/GCN5_download_cron
======================================================================
Trigger: 01059460 Segment: 000
BAT Trigger Time: 647403964.416 [s; MET]
Trigger Stop: 647403965.44 [s; MET]
UTC: 2021-07-08T02:25:37.084880 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 173.699151561178 Dec: -49.1867314058096 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.82
Image Trigger?: NO
Rate S/N Ratio: 8.42614977317636 [ if not an image trigger ]
Image S/N Ratio: 6.82
Flight Position: [ source = BAT ]
RA: 173.699151561178 Dec: -49.1867314058096 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 173.759469538435 Dec: -49.1639329017795 [deg; J2000]
{ 11h 35m 02.3s , -49d 09' 50.2" }
+/- 2.16323826155378 [arcmin] (estimated 90% radius based on SNR)
+/- 1.22202344693072 [arcmin] (formal 1-sigma fit error)
SNR: 10.1017792017162
Angular difference between Flight and Ground position is 2.732937 arcmin
Partial Coding Fraction: 0.9453125 [ including projection effects ]
Duration
T90: 2.77199995517731 +/- 0.700048576666753
Measured from: -0.48799991607666
to: 2.28400003910065 [s; relative to TRIGTIME]
T50: 1.1399998664856 +/- 0.568014068147241
Measured from: 0.340000152587891
to: 1.48000001907349 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.144000053405762
to: 0.855999946594238 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.687999963760376
to: 2.43999993801117 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.072710 0.113501 0.027692 0.011084
0.012954 0.013373 0.010782 0.009309 [error]
Peak 0.028907 0.057211 0.019788 0.006493
0.007318 0.007719 0.006288 0.005332 [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 2.43e-08 3.20e-08 3.09e-08 5.31e-08 1.05e-07 1.40e-07 erg/cm2
Error 5.10e-09 5.58e-09 9.10e-09 2.94e-08 2.19e-08 4.13e-08 erg/cm2
Peak flux Power-law 3.41e-01 2.79e-01 1.55e-01 1.26e-01 8.31e-01 9.01e-01 ph/cm2/s
Error 9.22e-02 5.60e-02 4.69e-02 7.06e-02 1.67e-01 1.85e-01 ph/cm2/s
Fluence Cutoff-PL 2.06e-08 4.74e-08 1.32e-08 1.27e-10 8.13e-08 8.13e-08 erg/cm2
Error 6.11e-09 9.40e-09 1.19e-08 1.74e-09 1.71e-08 1.71e-08 erg/cm2
Peak flux Cutoff-PL 2.49e-01 4.07e-01 1.19e-01 2.57e-03 7.78e-01 7.78e-01 ph/cm2/s
Error 1.13e-01 1.01e-01 9.66e-02 1.65e-02 1.67e-01 1.67e-01 ph/cm2/s
Fluence Band 2.03e-08 4.66e-08 1.82e-08 6.95e-09 8.94e-08 9.26e-08 erg/cm2
Error 5.65e-09 9.04e-09 1.20e-08 -------- -------- -------- erg/cm2
Peak flux Band 2.31e-01 4.22e-01 1.22e-01 2.79e-02 7.91e-01 8.02e-01 ph/cm2/s
Error 9.81e-02 -------- -------- -------- 1.63e-01 1.74e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.050 0.290 - - 3.62e-03 8.04e-04 60.530 57
CPL -2.890 3.758 34.1 5.0 5.22e+00 2.30e+03 47.610 56
The chi2 of BB fit is 48.01 which shows a significant improvement in the fit over a PL.
Check the BB fit.
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.852 0.328 - - 5.91e-03 1.41e-03 81.520 57
CPL -1.670 3.891 40.9 8.8 7.32e-01 9.07e+02 73.050 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 3.128 -0.688 2.440
T90 2.772 -0.488 2.284
T50 1.140 0.340 1.480
Peak 1.000 -0.144 0.856
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
173.7595 -49.1639 0.0190 13.0 129.2 0.2395 10.1 TRIG_01059460
------------------------------------------
Foreground time interval of the image:
-0.688 2.440 (delta_t = 3.128 [sec])
Background time interval of the image:
-239.416 -0.688 (delta_t = 238.728 [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 -0.688 sec. to 2.440 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.05050 ( -0.276832 0.302275 )
Norm@50keV : 3.61872E-03 ( -0.000810853 0.000798119 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 60.53 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 3.50e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 3.128 sec: 0.555787 ( -0.0936886 0.0937224 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.04688e-07 ( -2.14093e-08 2.23028e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.688 sec. to 2.440 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.89047 ( -5.2512 2.2646 )
Epeak [keV] : 34.0978 ( -4.31742 5.62991 )
Norm@50keV : 5.21838 ( -4.92549 4585.07 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 47.61 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 7.80e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 3.128 sec: 0.524113 ( -0.091252 0.091754 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.13145e-08 ( -1.57911e-08 1.8392e-08 ) ergs/cm2
Band function
Time interval is from -0.688 sec. to 2.440 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.21293 ( -3.79159 -3.41656 )
beta : -3.71844 ( 9.98412 19.9562 )
Epeak [keV] : 32.3203 ( -2.27129 5.00161 )
Norm@50keV : 46.4500 ( -46.4135 24.9393 )
------------------------------------------------------------
Photon flux (15-150 keV) in 3.128 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 8.94323e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.92416 (-1.19501 1.40195)
R^2/D10^2 : 0.449088 (-0.197225 0.334728)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 48.01 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 7.96e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.169e-08 6.032e-09
25- 50 4.548e-08 1.090e-08
50-150 1.691e-08 7.185e-09
15-150 8.407e-08 2.063e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 51.2799 (-16.7478 31.9019)
Norm : 3.21454 (-0.745681 0.993615)
------------------------------------------------------------
#Fit statistic : Chi-Squared 55.06 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 5.48e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.473e-08 5.435e-09
25- 50 3.583e-08 8.555e-09
50-150 3.562e-08 1.750e-08
15-150 9.617e-08 2.554e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.02612 (-27.1123 -27.1123)
R1^2/D10^2 : 0.425844 (-0.000509326 0.775417)
kT2 [keV] : 0.461307 (-8.71642 1.57946)
R2^2/D10^2 : 2.18660E+11 (-2.38032e+11 5.30785e+18)
------------------------------------------------------------
#Fit statistic : Chi-Squared 47.73 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 7.46e-01 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.182e-08 1.075e-08
25- 50 4.502e-08 2.711e-08
50-150 2.088e-08 1.826e-08
15-150 8.772e-08 4.870e-08
Peak spectrum fit
Power-law model
Time interval is from -0.144 sec. to 0.856 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.85177 ( -0.314098 0.341983 )
Norm@50keV : 5.90529E-03 ( -0.00142683 0.00139307 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 81.52 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 1.82e-02 with 57 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 0.830650 ( -0.166737 0.166738 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.42892e-08 ( -1.279e-08 1.32727e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.144 sec. to 0.856 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.66995 ( -5.49528 2.28642 )
Epeak [keV] : 40.8678 ( -6.52527 10.9993 )
Norm@50keV : 0.731929 ( -0.838102 1812.37 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 73.05 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 6.26e-02 with 56 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 0.777689 ( -0.166518 0.167744 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.34077e-08 ( -1.03215e-08 1.35972e-08 ) ergs/cm2
Band function
Time interval is from -0.144 sec. to 0.856 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.74842 ( -4.94684 -4.74842 )
beta : -3.33365 ( 3.33365 0.965613 )
Epeak [keV] : 35.9997 ( -4.72009 5.29739 )
Norm@50keV : 75.6828 ( -14.2302 264.336 )
------------------------------------------------------------
Photon flux (15-150 keV) in 1 sec: 0.791394 ( 6.20861 -0.158681 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.74079e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.5004 (-1.67021 2.0529)
R^2/D10^2 : 0.369089 (-0.183962 0.336595)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 73.13 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 7.37e-02 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.412e-09 2.917e-09
25- 50 2.237e-08 7.010e-09
50-150 1.343e-08 6.266e-09
15-150 4.421e-08 1.411e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 75.2398 (-31.1 81.5782)
Norm : 4.10790 (-1.12665 1.31364)
------------------------------------------------------------
#Fit statistic : Chi-Squared 78.29 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 3.22e-02 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.061e-08 3.110e-09
25- 50 1.721e-08 5.414e-09
50-150 2.328e-08 1.689e-08
15-150 5.110e-08 2.050e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 0.246884 (-0.777959 1.29372)
R1^2/D10^2 : 1.56659E+21 (-1.66797e+21 -1.66819e+21)
kT2 [keV] : 10.8524 (-1.75183 2.19107)
R2^2/D10^2 : 0.318064 (-0.161923 0.298591)
------------------------------------------------------------
#Fit statistic : Chi-Squared 70.10 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 8.26e-02 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.142e-09 2.833e-09
25- 50 2.157e-08 7.658e-09
50-150 1.441e-08 7.094e-09
15-150 4.412e-08 1.500e-08
Plot creation:
Fri Jul 9 03:30:34 EDT 2021