batgrbproduct analysis for trigger=1070298
batgrbproduct Analysis for Trigger=1070298
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 Aug 26 12:50:40 EDT 2021
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1070298/GCN5_download_cron
======================================================================
Trigger: 01070298 Segment: 000
BAT Trigger Time: 651567235.18 [s; MET]
Trigger Stop: 651567235.196 [s; MET]
UTC: 2021-08-25T06:53:27.570780 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 238.835961213482 Dec: -54.0702093582679 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.65
Image Trigger?: NO
Rate S/N Ratio: 42.2255846614348 [ if not an image trigger ]
Image S/N Ratio: 9.65
Flight Position: [ source = BAT ]
RA: 238.835961213482 Dec: -54.0702093582679 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 238.827767980682 Dec: -54.0535258804215 [deg; J2000]
{ 15h 55m 18.7s , -54d 03' 12.7" }
+/- 2.08236783674387 [arcmin] (estimated 90% radius based on SNR)
+/- 0.659602847332371 [arcmin] (formal 1-sigma fit error)
SNR: 10.6668530582881
Angular difference between Flight and Ground position is 1.041760 arcmin
Partial Coding Fraction: 0.3359375 [ including projection effects ]
Duration
T90: 0.0199999809265137 +/- 0.00894426338023564
Measured from: 1.19209289550781e-07
to: 0.0200001001358032 [s; relative to TRIGTIME]
T50: 0.0119999647140503 +/- 0.00400006771087646
Measured from: 0.00400018692016602
to: 0.0160001516342163 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.485999941825867
to: 0.514000058174133 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.0240000486373901 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.050356 0.042664 0.009027 0.000828
0.006024 0.006003 0.003298 0.001347 [error]
Peak 0.076375 0.045388 0.016188 -0.006686
0.013055 0.012565 0.010187 0.008202 [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 1.75e-08 1.23e-08 5.72e-09 3.71e-09 3.73e-08 3.92e-08 erg/cm2
Error 3.15e-09 2.18e-09 1.78e-09 2.01e-09 6.18e-09 6.86e-09 erg/cm2
Peak flux Power-law 8.46e-01 3.92e-01 1.10e-01 3.85e-02 1.37e+00 1.39e+00 ph/cm2/s
Error 2.32e-01 1.19e-01 6.80e-02 4.83e-02 3.23e-01 3.30e-01 ph/cm2/s
Fluence Cutoff-PL 1.66e-08 1.80e-08 4.23e-09 1.09e-10 3.89e-08 3.89e-08 erg/cm2
Error 3.45e-09 3.84e-09 2.20e-09 3.50e-10 6.00e-09 6.00e-09 erg/cm2
Peak flux Cutoff-PL 8.26e-01 4.21e-01 1.04e-01 1.60e-02 1.36e+00 1.37e+00 ph/cm2/s
Error 2.46e-01 1.48e-01 -------- 4.58e-02 3.21e-01 3.24e-01 ph/cm2/s
Fluence Band 1.67e-08 1.74e-08 4.57e-09 1.63e-10 3.86e-08 3.88e-08 erg/cm2
Error 3.43e-09 3.64e-09 -------- -------- -------- -------- 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 3.107 0.283 - - 1.23e-01 2.99e-02 33.120 57
CPL 0.111 1.964 22.5 10.9 1.04e+01 1.76e+02 22.310 56
The chi2 of BB fit is 24.23 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 2.835 0.608 - - 5.60e-03 2.69e-03 69.180 57
CPL 1.910 0.000 3.6 0.0 2.14e-02 0.00e+00 68.930 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 0.024 0.000 0.024
T90 0.020 0.000 0.020
T50 0.012 0.004 0.016
Peak 1.000 -0.486 0.514
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
238.8278 -54.0535 0.0179 32.8 125.9 0.1033 10.7 TRIG_01070298
------------------------------------------
Foreground time interval of the image:
0.000 0.024 (delta_t = 0.024 [sec])
Background time interval of the image:
-239.180 0.000 (delta_t = 239.180 [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 0.000 sec. to 0.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.10749 ( -0.263409 0.301708 )
Norm@50keV : 0.122909 ( -0.0301097 0.0297133 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 33.12 using 59 PHA bins.
# Reduced chi-squared = 0.5810 for 57 degrees of freedom
# Null hypothesis probability = 9.952465e-01
Photon flux (15-150 keV) in 0.024 sec: 36.5897 ( -5.86673 5.86889 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.73094e-08 ( -6.16867e-09 6.18874e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.110761 ( -2.28678 1.64196 )
Epeak [keV] : 22.4981 ( -15.9302 5.80983 )
Norm@50keV : 10.4133 ( -10.5597 341.93 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 22.31 using 59 PHA bins.
# Reduced chi-squared = 0.3984 for 56 degrees of freedom
# Null hypothesis probability = 9.999839e-01
Photon flux (15-150 keV) in 0.024 sec: 38.2683 ( -5.9878 5.9861 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.8922e-08 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.109565 ( -1.30424 4.85986 )
beta : -10.0000 ( 10 1.06581e-14 )
Epeak [keV] : 22.4934 ( -6.99469 5.81775 )
Norm@50keV : 10.5043 ( -10.5043 314.382 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 22.31 using 59 PHA bins.
# Reduced chi-squared = 0.4056 for 55 degrees of freedom
# Null hypothesis probability = 9.999742e-01
Photon flux (15-150 keV) in 0.024 sec: 38.2902 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.86338e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 6.76823 (-0.814952 0.849171)
R^2/D10^2 : 90.3690 (-38.459 69.48)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 24.23 using 59 PHA bins.
# Reduced chi-squared = 0.4252 for 57 degrees of freedom
# Null hypothesis probability = 9.999579e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.539e-08 3.725e-09
25- 50 1.973e-08 4.480e-09
50-150 2.890e-09 1.350e-09
15-150 3.801e-08 7.248e-09
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 21.2301 (-4.085 4.86619)
Norm : 446.443 (-117.818 158.937)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.745e-08 3.217e-09
25- 50 1.598e-08 2.986e-09
50-150 5.283e-09 2.245e-09
15-150 3.872e-08 6.768e-09
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.94363 (-4.94363 -4.94363)
R1^2/D10^2 : 210.905 (-210.905 -210.905)
kT2 [keV] : 9.10961 (-2.76543 -9.10961)
R2^2/D10^2 : 12.3569 (-12.3569 110.818)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.658e-08 1.009e-08
25- 50 1.791e-08 1.073e-08
50-150 4.421e-09 2.692e-09
15-150 3.891e-08 2.267e-08
Peak spectrum fit
Power-law model
Time interval is from -0.486 sec. to 0.514 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.83510 ( -0.516235 0.698834 )
Norm@50keV : 5.60166E-03 ( -0.00266747 0.00271638 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.18 using 59 PHA bins.
# Reduced chi-squared = 1.214 for 57 degrees of freedom
# Null hypothesis probability = 1.293648e-01
Photon flux (15-150 keV) in 1 sec: 1.37014 ( -0.322758 0.322995 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.26903e-08 ( -1.8425e-08 1.97504e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.486 sec. to 0.514 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.91007 ( )
Epeak [keV] : 3.56801 ( )
Norm@50keV : 2.14116E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.93 using 59 PHA bins.
# Reduced chi-squared = 1.231 for 56 degrees of freedom
# Null hypothesis probability = 1.149973e-01
Photon flux (15-150 keV) in 1 sec: 1.36344 ( -0.32032 0.32097 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.10352e-08 ( -1.77106e-08 2.02345e-08 ) ergs/cm2
Band function
Time interval is from -0.486 sec. to 0.514 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.94530 ( -5.29532 1.92643 )
beta : -10.0000 ( 10 1.77636e-15 )
Epeak [keV] : 2.26856 ( -0.902682 27.3111 )
Norm@50keV : 2.02756E-02 ( -0.00906532 0.0754287 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.91 using 59 PHA bins.
# Reduced chi-squared = 1.253 for 55 degrees of freedom
# Null hypothesis probability = 9.832086e-02
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 6.50638 (-2.20979 2.51672)
R^2/D10^2 : 3.44853 (-2.54102 18.1462)
(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 2.160e-08 1.222e-08
25- 50 2.556e-08 1.226e-08
50-150 3.227e-09 2.518e-09
15-150 5.039e-08 2.982e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 25.1368 (-11.0165 19.6505)
Norm : 13.0187 (-5.49738 12.9721)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.393e-08 8.465e-09
25- 50 2.461e-08 1.062e-08
50-150 1.055e-08 8.195e-09
15-150 5.909e-08 2.331e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.93362 (-1.77003 1.9616)
R1^2/D10^2 : 109.985 (-101.15 198140)
kT2 [keV] : 10.9769 (-3.87068 6.75864)
R2^2/D10^2 : 0.283668 (-0.246622 1.68612)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.501e-08 1.389e-08
25- 50 2.254e-08 1.272e-08
50-150 1.368e-08 9.685e-09
15-150 6.123e-08 3.198e-08
Plot creation:
Thu Aug 26 12:57:02 EDT 2021