batgrbproduct analysis for trigger=1090656
batgrbproduct Analysis for Trigger=1090656
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 Dec 24 20:22:30 EST 2021
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1090656/GCN5_download_cron
======================================================================
Trigger: 01090656 Segment: 000
BAT Trigger Time: 661962595.008 [s; MET]
Trigger Stop: 661962596.032 [s; MET]
UTC: 2021-12-23T14:29:26.700140 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 227.163643811444 Dec: -26.8726512362331 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 12.22
Image Trigger?: NO
Rate S/N Ratio: 30.4466746952767 [ if not an image trigger ]
Image S/N Ratio: 12.22
Flight Position: [ source = BAT ]
RA: 227.163643811444 Dec: -26.8726512362331 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 227.165332770964 Dec: -26.8780599364081 [deg; J2000]
{ 15h 08m 39.7s , -26d 52' 41.0" }
+/- 1.15408864531095 [arcmin] (estimated 90% radius based on SNR)
+/- 0.379082264677517 [arcmin] (formal 1-sigma fit error)
SNR: 24.7859336391945
Angular difference between Flight and Ground position is 0.336876 arcmin
Partial Coding Fraction: 0.328125 [ including projection effects ]
Duration
T90: 15 +/- 5
Measured from: -7.00799989700317
to: 7.99200010299683 [s; relative to TRIGTIME]
T50: 6 +/- 1
Measured from: -1.00799989700317
to: 4.99200010299683 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.00800001621246338
to: 0.991999983787537 [s; relative to TRIGTIME]
Total Fluence
Measured from: -13.0080000162125
to: 8.99199998378754 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.700975 1.164112 1.170806 0.478392
0.057602 0.062196 0.056594 0.046079 [error]
Peak 0.055996 0.164976 0.134104 0.065610
0.013813 0.015699 0.015632 0.011933 [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 2.18e-07 4.95e-07 8.90e-07 3.79e-06 2.42e-06 5.39e-06 erg/cm2
Error 2.32e-08 3.17e-08 5.31e-08 5.11e-07 1.37e-07 5.38e-07 erg/cm2
Peak flux Power-law 6.98e-01 9.30e-01 9.10e-01 1.60e+00 3.06e+00 4.13e+00 ph/cm2/s
Error 1.61e-01 1.34e-01 1.14e-01 4.13e-01 3.69e-01 5.18e-01 ph/cm2/s
Fluence Cutoff-PL 1.99e-07 5.09e-07 9.28e-07 2.33e-06 2.38e-06 3.97e-06 erg/cm2
Error 2.89e-08 3.54e-08 6.42e-08 1.08e-06 1.45e-07 1.09e-06 erg/cm2
Peak flux Cutoff-PL 6.13e-01 9.78e-01 9.79e-01 8.84e-01 3.02e+00 3.45e+00 ph/cm2/s
Error 1.88e-01 1.55e-01 1.11e-01 -------- 3.72e-01 7.75e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- 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 1.154 0.092 - - 1.07e-02 5.71e-04 72.970 57
CPL 0.774 0.383 182.6 941.6 1.59e-02 6.40e-03 69.840 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.031 0.191 - - 2.65e-02 3.13e-03 58.050 57
CPL 0.429 0.791 143.6 -43.3 5.10e-02 5.35e-02 56.210 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: 12.288000 sec.
T50 in the 50-300 keV band: 5.184000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 22.000 -13.008 8.992
T90 15.000 -7.008 7.992
T50 6.000 -1.008 4.992
Peak 1.000 -0.008 0.992
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
227.1653 -26.8781 0.0078 33.3 -82.4 3.6159 24.8 TRIG_01090656
------------------------------------------
Foreground time interval of the image:
-13.008 8.992 (delta_t = 22.000 [sec])
Background time interval of the image:
-239.008 -95.798 (delta_t = 143.210 [sec])
-95.008 -13.008 (delta_t = 82.000 [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 -13.008 sec. to 8.992 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.15351 ( -0.0926591 0.0915146 )
Norm@50keV : 1.07183E-02 ( -0.000571728 0.000571146 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.97 using 59 PHA bins.
# Reduced chi-squared = 1.280 for 57 degrees of freedom
# Null hypothesis probability = 7.549028e-02
Photon flux (15-150 keV) in 22 sec: 1.25050 ( -0.069849 0.0699835 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.42491e-06 ( -1.36957e-07 1.37271e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -13.008 sec. to 8.992 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.774144 ( -0.402208 0.362865 )
Epeak [keV] : 182.596 ( -65.9386 1817.27 )
Norm@50keV : 1.59329E-02 ( -0.00483845 0.00796816 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.84 using 59 PHA bins.
# Reduced chi-squared = 1.247 for 56 degrees of freedom
# Null hypothesis probability = 1.011027e-01
Photon flux (15-150 keV) in 22 sec: 1.23038 ( -0.07246 0.07252 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.38335e-06 ( -1.45508e-07 1.44584e-07 ) ergs/cm2
Band function
Time interval is from -13.008 sec. to 8.992 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.521937 ( -0.671714 0.516416 )
beta : -1.37970 ( 1.37965 0.23146 )
Epeak [keV] : 115.724 ( -56.583 435.159 )
Norm@50keV : 2.20088E-02 ( -0.0110644 0.274767 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.93 using 59 PHA bins.
# Reduced chi-squared = 1.253 for 55 degrees of freedom
# Null hypothesis probability = 9.802009e-02
Photon flux (15-150 keV) in 22 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] : 20.0057 ( )
R^2/D10^2 : 5.85160E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 123.05 using 59 PHA bins.
# Reduced chi-squared = 2.1588 for 57 degrees of freedom
# Null hypothesis probability = 9.293001e-07
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.931e-08 1.097e-08
25- 50 4.948e-07 4.070e-08
50-150 1.468e-06 1.310e-07
15-150 2.062e-06 1.401e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 5.26777 ( )
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.886e-07 1.793e-08
25- 50 5.551e-07 3.520e-08
50-150 1.217e-06 8.855e-08
15-150 2.061e-06 2.405e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.97950 (-2.44273 2.61794)
R1^2/D10^2 : 0.333654 (-0.149501 0.39823)
kT2 [keV] : 37.0361 (-8.9626 25.5189)
R2^2/D10^2 : 6.28163E-03 (-0.00483089 0.00990758)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.746e-07 4.385e-08
25- 50 5.409e-07 1.183e-07
50-150 1.681e-06 7.026e-07
15-150 2.397e-06 7.915e-07
Peak spectrum fit
Power-law model
Time interval is from -0.008 sec. to 0.992 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.03102 ( -0.194285 0.187648 )
Norm@50keV : 2.65322E-02 ( -0.0031333 0.00312413 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.05 using 59 PHA bins.
# Reduced chi-squared = 1.018 for 57 degrees of freedom
# Null hypothesis probability = 4.363931e-01
Photon flux (15-150 keV) in 1 sec: 3.06026 ( -0.368515 0.369317 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.83787e-07 ( -3.53808e-08 3.55975e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.008 sec. to 0.992 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.429162 ( -0.903824 0.67903 )
Epeak [keV] : 143.552 ( -57.0286 -143.56 )
Norm@50keV : 5.10007E-02 ( -0.0261211 0.0807968 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.21 using 59 PHA bins.
# Reduced chi-squared = 1.004 for 56 degrees of freedom
# Null hypothesis probability = 4.669848e-01
Photon flux (15-150 keV) in 1 sec: 3.01881 ( -0.37182 0.37277 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.76393e-07 ( -3.8219e-08 3.7505e-08 ) ergs/cm2
Band function
Time interval is from -0.008 sec. to 0.992 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -5 -5 )
beta : -1.40030 ( -0.361199 0.283868 )
Epeak [keV] : 39.7109 ( -7.91573 6.33096 )
Norm@50keV : 144.356 ( -16.512 356.42 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.49 using 59 PHA bins.
# Reduced chi-squared = 0.9180 for 55 degrees of freedom
# Null hypothesis probability = 6.474027e-01
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] : 20.0723 (-2.89114 3.58463)
R^2/D10^2 : 0.149259 (-0.0617936 0.0987034)
(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 1.158e-08 2.696e-09
25- 50 5.780e-08 1.035e-08
50-150 1.727e-07 3.380e-08
15-150 2.421e-07 4.125e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-25.2887 -200)
Norm : 12.4969 (-1.52669 1.52669)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.111e-08 1.754e-08
25- 50 5.984e-08 3.326e-08
50-150 1.312e-07 7.240e-08
15-150 2.222e-07 1.212e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 11.3208 (-3.36221 3.95071)
R1^2/D10^2 : 0.616283 (-0.304321 0.525874)
kT2 [keV] : 47.0317 (-30.8995 -60.8923)
R2^2/D10^2 : 7.44786E-03 (-0.0038419 0.0279107)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.847e-08 1.059e-08
25- 50 6.208e-08 3.376e-08
50-150 1.903e-07 1.040e-07
15-150 2.708e-07 1.414e-07
Plot creation:
Fri Dec 24 20:32:50 EST 2021