batgrbproduct analysis for trigger=1090853
batgrbproduct Analysis for Trigger=1090853
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 Dec 26 19:12:36 EST 2021
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1090853/GCN5_download_cron
======================================================================
Trigger: 01090853 Segment: 000
BAT Trigger Time: 662130767.424 [s; MET]
Trigger Stop: 662130771.52 [s; MET]
UTC: 2021-12-25T13:12:19.104820 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 258.568373830299 Dec: 17.2625625868679 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.17
Image Trigger?: NO
Rate S/N Ratio: 13.7840487520902 [ if not an image trigger ]
Image S/N Ratio: 9.17
Flight Position: [ source = BAT ]
RA: 258.568373830299 Dec: 17.2625625868679 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 258.545330375559 Dec: 17.2769896200868 [deg; J2000]
{ 17h 14m 10.9s , +17d 16' 37.2" }
+/- 0.51615651976134 [arcmin] (estimated 90% radius based on SNR)
+/- 0.126906626811575 [arcmin] (formal 1-sigma fit error)
SNR: 78.2403240986058
Angular difference between Flight and Ground position is 1.578743 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 121.544000029564 +/- 2.936653815745
Measured from: 4.58000004291534
to: 126.124000072479 [s; relative to TRIGTIME]
T50: 27.8439998626709 +/- 0.807415643944995
Measured from: 48.2480001449585
to: 76.0920000076294 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 50.1879999637604
to: 51.1879999637604 [s; relative to TRIGTIME]
Total Fluence
Measured from: -24.7760000228882
to: 139.815999984741 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 7.697249 10.022654 7.166841 1.496125
0.101443 0.104445 0.091238 0.071541 [error]
Peak 0.183755 0.294693 0.254362 0.054239
0.009516 0.010912 0.010542 0.006602 [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 2.30e-06 4.00e-06 5.30e-06 1.43e-05 1.55e-05 2.59e-05 erg/cm2
Error 8.43e-08 8.39e-08 1.05e-07 6.72e-07 2.64e-07 7.10e-07 erg/cm2
Peak flux Power-law 1.79e+00 1.98e+00 1.57e+00 2.06e+00 6.11e+00 7.40e+00 ph/cm2/s
Error 1.36e-01 9.33e-02 8.13e-02 2.18e-01 2.65e-01 3.28e-01 ph/cm2/s
Fluence Cutoff-PL 2.12e-06 4.03e-06 5.43e-06 1.03e-05 1.52e-05 2.19e-05 erg/cm2
Error 1.15e-07 8.75e-08 1.23e-07 1.61e-06 2.97e-07 1.64e-06 erg/cm2
Peak flux Cutoff-PL 1.52e+00 2.10e+00 1.69e+00 1.02e+00 5.92e+00 6.33e+00 ph/cm2/s
Error 1.67e-01 1.08e-01 9.82e-02 2.79e-01 2.75e-01 3.93e-01 ph/cm2/s
Fluence Band 2.04e-06 4.07e-06 5.34e-06 1.29e-05 1.52e-05 2.44e-05 erg/cm2
Error -------- -------- 1.68e-07 -------- 2.99e-07 -------- erg/cm2
Peak flux Band 1.54e+00 2.08e+00 1.69e+00 1.10e+00 5.95e+00 6.43e+00 ph/cm2/s
Error -------- -------- 9.25e-02 -------- -------- -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.592 0.033 - - 1.00e-02 1.70e-04 64.870 57
CPL 1.309 0.140 139.9 51.5 1.33e-02 1.83e-03 52.290 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.337 0.072 - - 5.08e-02 2.18e-03 66.170 57
CPL 0.580 0.321 99.8 24.4 1.17e-01 4.17e-02 46.930 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: 91.008000 sec.
T50 in the 50-300 keV band: 29.376000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 164.592 -24.776 139.816
T90 121.544 4.580 126.124
T50 27.844 48.248 76.092
Peak 1.000 50.188 51.188
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
258.5453 +17.2770 0.0024 4.1 -113.5 19.1919 78.2 TRIG_01090853
------------------------------------------
Foreground time interval of the image:
-24.776 73.277 (delta_t = 98.053 [sec])
Background time interval of the image:
-239.424 -24.776 (delta_t = 214.648 [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 -24.776 sec. to 139.816 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.59233 ( -0.0329778 0.0329649 )
Norm@50keV : 1.00368E-02 ( -0.000170445 0.000170419 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.87 using 59 PHA bins.
# Reduced chi-squared = 1.138 for 57 degrees of freedom
# Null hypothesis probability = 2.213188e-01
Photon flux (15-150 keV) in 164.6 sec: 1.28673 ( -0.0263732 0.0264861 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.54648e-05 ( -2.64463e-07 2.64509e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -24.776 sec. to 139.816 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.30878 ( -0.141887 0.137873 )
Epeak [keV] : 139.901 ( -28.0062 74.8953 )
Norm@50keV : 1.33292E-02 ( -0.00167932 0.00197934 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.29 using 59 PHA bins.
# Reduced chi-squared = 0.9337 for 56 degrees of freedom
# Null hypothesis probability = 6.161618e-01
Photon flux (15-150 keV) in 164.6 sec: 1.25224 ( -0.03043 0.03066 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.5192e-05 ( -2.97119e-07 2.96198e-07 ) ergs/cm2
Band function
Time interval is from -24.776 sec. to 139.816 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.29694 ( -0.14983 0.857366 )
beta : -1.90440 ( 1.89667 0.265202 )
Epeak [keV] : 135.231 ( -86.1403 77.6854 )
Norm@50keV : 1.35090E-02 ( -0.00188941 0.0428039 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.23 using 59 PHA bins.
# Reduced chi-squared = 0.9497 for 55 degrees of freedom
# Null hypothesis probability = 5.810467e-01
Photon flux (15-150 keV) in 164.6 sec: 1.24161 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.51564e-05 ( -1.51553e-05 -2.98535e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 17.0610 ( )
R^2/D10^2 : 8.61277E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 684.61 using 59 PHA bins.
# Reduced chi-squared = 12.011 for 57 degrees of freedom
# Null hypothesis probability = 2.056652e-108
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.396e-07 3.062e-08
25- 50 3.725e-06 1.004e-07
50-150 7.751e-06 2.222e-07
15-150 1.232e-05 2.173e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-12.2418 -200)
Norm : 5.15521 (-0.0871247 0.0871247)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.114e-06 4.280e-08
25- 50 4.066e-06 7.736e-08
50-150 8.918e-06 1.835e-07
15-150 1.510e-05 3.103e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.88998 (-0.539923 0.563814)
R1^2/D10^2 : 0.843669 (-0.174784 0.23658)
kT2 [keV] : 27.7795 (-1.73484 2.10268)
R2^2/D10^2 : 1.20252E-02 (-0.00286893 0.00334834)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.797e-06 1.062e-07
25- 50 4.136e-06 1.457e-07
50-150 9.017e-06 3.597e-07
15-150 1.495e-05 4.337e-07
Peak spectrum fit
Power-law model
Time interval is from 50.188 sec. to 51.188 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.33681 ( -0.071557 0.0718882 )
Norm@50keV : 5.08279E-02 ( -0.00217887 0.00217743 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.17 using 59 PHA bins.
# Reduced chi-squared = 1.161 for 57 degrees of freedom
# Null hypothesis probability = 1.898849e-01
Photon flux (15-150 keV) in 1 sec: 6.10694 ( -0.264725 0.264892 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.97912e-07 ( -2.37939e-08 2.38782e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 50.188 sec. to 51.188 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.579988 ( -0.333402 0.309581 )
Epeak [keV] : 99.8335 ( -15.9275 32.8699 )
Norm@50keV : 0.117003 ( -0.033071 0.0503965 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.93 using 59 PHA bins.
# Reduced chi-squared = 0.8380 for 56 degrees of freedom
# Null hypothesis probability = 8.008341e-01
Photon flux (15-150 keV) in 1 sec: 5.91628 ( -0.27499 0.27502 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.77381e-07 ( -2.5809e-08 2.5749e-08 ) ergs/cm2
Band function
Time interval is from 50.188 sec. to 51.188 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.579932 ( -0.238616 0.359026 )
beta : -10.0000 ( 10 3.55271e-15 )
Epeak [keV] : 99.8154 ( -10.4171 32.8733 )
Norm@50keV : 0.117009 ( -0.0331011 0.0504598 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.93 using 59 PHA bins.
# Reduced chi-squared = 0.8532 for 55 degrees of freedom
# Null hypothesis probability = 7.723277e-01
Photon flux (15-150 keV) in 1 sec: 5.94680 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.77736e-07 ( 0 0 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 16.9254 ( )
R^2/D10^2 : 0.485537 ( )
(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 2.836e-08 2.175e-09
25- 50 1.250e-07 7.300e-09
50-150 2.554e-07 2.080e-08
15-150 4.088e-07 2.180e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-9.3223 -200)
Norm : 25.2483 (-1.07761 1.07761)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.286e-08 3.110e-09
25- 50 1.209e-07 5.700e-09
50-150 2.652e-07 1.300e-08
15-150 4.490e-07 2.050e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.99944 (-1.77946 1.9195)
R1^2/D10^2 : 3.03500 (-1.33711 3.52103)
kT2 [keV] : 25.5929 (-3.56936 5.83908)
R2^2/D10^2 : 9.39408E-02 (-0.0515156 0.0663399)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.567e-08 9.375e-09
25- 50 1.221e-07 1.810e-08
50-150 3.093e-07 5.710e-08
15-150 4.771e-07 8.920e-08
Plot creation:
Sun Dec 26 19:19:44 EST 2021