batgrbproduct analysis for trigger=1155864
batgrbproduct Analysis for Trigger=1155864
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 Feb 24 19:20:14 EST 2023
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1155864/GCN5_download_cron
======================================================================
Trigger: 01155864 Segment: 000
BAT Trigger Time: 698889331.82 [s; MET]
Trigger Stop: 698889331.852 [s; MET]
UTC: 2023-02-23T23:55:01.007300 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 272.159839955773 Dec: -20.4006430248859 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 14.33
Image Trigger?: NO
Rate S/N Ratio: 89.0786169627706 [ if not an image trigger ]
Image S/N Ratio: 14.33
Flight Position: [ source = BAT ]
RA: 272.159839955773 Dec: -20.4006430248859 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 272.146445406993 Dec: -20.411841906341 [deg; J2000]
{ 18h 08m 35.1s , -20d 24' 42.6" }
+/- 1.32783655172383 [arcmin] (estimated 90% radius based on SNR)
+/- 0.574642880791437 [arcmin] (formal 1-sigma fit error)
SNR: 20.2860501646165
Angular difference between Flight and Ground position is 1.009386 arcmin
Partial Coding Fraction: 1.03125 [ including projection effects ]
Duration
T90: 0.0839999914169312 +/- 0.0312409322782583
Measured from: -0.00399994850158691
to: 0.0800000429153442 [s; relative to TRIGTIME]
T50: 0.0199999809265137 +/- 0.0089442100686973
Measured from: 0.0120000839233398
to: 0.0320000648498535 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.462000012397766
to: 0.537999987602234 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0240000486373901
to: 0.0959999561309814 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.135947 0.107787 0.032746 0.001551
0.009416 0.008697 0.005317 0.002542 [error]
Peak 0.143214 0.115193 0.046288 0.005171
0.013661 0.012734 0.009699 0.006735 [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 3.97e-08 3.79e-08 2.52e-08 2.61e-08 1.13e-07 1.29e-07 erg/cm2
Error 4.64e-09 3.69e-09 4.47e-09 8.52e-09 1.15e-08 1.57e-08 erg/cm2
Peak flux Power-law 1.26e+00 8.05e-01 3.32e-01 1.86e-01 2.49e+00 2.59e+00 ph/cm2/s
Error 2.03e-01 9.90e-02 7.34e-02 7.54e-02 3.00e-01 3.11e-01 ph/cm2/s
Fluence Cutoff-PL 3.69e-08 4.43e-08 2.24e-08 4.15e-09 1.07e-07 1.08e-07 erg/cm2
Error 5.20e-09 5.47e-09 5.71e-09 -------- 1.15e-08 1.26e-08 erg/cm2
Peak flux Cutoff-PL 1.20e+00 8.85e-01 3.10e-01 5.87e-02 2.44e+00 2.46e+00 ph/cm2/s
Error 2.24e-01 1.44e-01 9.19e-02 -------- 3.06e-01 3.22e-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 2.590 0.175 - - 9.22e-02 1.22e-02 56.130 57
CPL 1.273 0.825 21.2 0.0 5.85e-01 0.00e+00 48.620 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.280 0.233 - - 1.44e-02 2.43e-03 62.550 57
CPL 1.466 0.940 25.0 0.0 4.56e-02 0.00e+00 60.850 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 0.120 -0.024 0.096
T90 0.084 -0.004 0.080
T50 0.020 0.012 0.032
Peak 1.000 -0.462 0.538
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
272.1464 -20.4118 0.0095 10.0 -153.0 0.2738 20.3 TRIG_01155864
------------------------------------------
Foreground time interval of the image:
-0.024 0.096 (delta_t = 0.120 [sec])
Background time interval of the image:
-239.820 -186.040 (delta_t = 53.780 [sec])
-184.820 -81.470 (delta_t = 103.350 [sec])
-80.820 -37.716 (delta_t = 43.104 [sec])
-36.820 -0.024 (delta_t = 36.796 [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 -0.024 sec. to 0.096 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.58957 ( -0.169149 0.181515 )
Norm@50keV : 9.21739E-02 ( -0.0123412 0.0121277 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.13 using 59 PHA bins.
# Reduced chi-squared = 0.9848 for 57 degrees of freedom
# Null hypothesis probability = 5.075851e-01
Photon flux (15-150 keV) in 0.12 sec: 19.1483 ( -1.78482 1.78594 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.13487e-07 ( -1.14494e-08 1.15377e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.024 sec. to 0.096 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.27317 ( -1.0115 0.638435 )
Epeak [keV] : 21.2241 ( )
Norm@50keV : 0.584781 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.62 using 59 PHA bins.
# Reduced chi-squared = 0.8682 for 56 degrees of freedom
# Null hypothesis probability = 7.475971e-01
Photon flux (15-150 keV) in 0.12 sec: 18.7068 ( -1.8105 1.8104 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.07053e-07 ( -1.13334e-08 1.17292e-08 ) ergs/cm2
Band function
Time interval is from -0.024 sec. to 0.096 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.13733 ( -0.564965 1.47758 )
beta : -4.10844 ( 4.03123 1.21775 )
Epeak [keV] : 22.7785 ( -12.2069 6.45539 )
Norm@50keV : 0.706907 ( -0.195191 7.51887 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.44 using 59 PHA bins.
# Reduced chi-squared = 0.8807 for 55 degrees of freedom
# Null hypothesis probability = 7.218457e-01
Photon flux (15-150 keV) in 0.12 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] : 7.96986 (-0.779765 0.823932)
R^2/D10^2 : 21.3404 (-7.22822 11.4652)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.86 using 59 PHA bins.
# Reduced chi-squared = 1.138 for 57 degrees of freedom
# Null hypothesis probability = 2.215317e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.933e-08 4.254e-09
25- 50 5.100e-08 5.964e-09
50-150 1.323e-08 3.605e-09
15-150 9.356e-08 1.087e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 32.1747 (-5.48621 6.78142)
Norm : 146.691 (-25.0587 30.9703)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.707e-08 4.248e-09
25- 50 4.398e-08 4.878e-09
50-150 2.635e-08 7.170e-09
15-150 1.074e-07 1.166e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.91061 (-1.37211 1.71606)
R1^2/D10^2 : 252.808 (-190.873 1939.42)
kT2 [keV] : 10.9030 (-1.90621 3.56697)
R2^2/D10^2 : 4.27143 (-3.3517 6.95194)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.741e-08 1.849e-08
25- 50 4.388e-08 1.985e-08
50-150 2.378e-08 1.361e-08
15-150 1.051e-07 4.643e-08
Peak spectrum fit
Power-law model
Time interval is from -0.462 sec. to 0.538 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.27965 ( -0.223836 0.241945 )
Norm@50keV : 1.44326E-02 ( -0.00246375 0.00240503 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.55 using 59 PHA bins.
# Reduced chi-squared = 1.097 for 57 degrees of freedom
# Null hypothesis probability = 2.856243e-01
Photon flux (15-150 keV) in 1 sec: 2.49397 ( -0.2999 0.299946 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.37416e-07 ( -1.94434e-08 1.98637e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.462 sec. to 0.538 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.46607 ( -1.33584 0.544144 )
Epeak [keV] : 24.9612 ( )
Norm@50keV : 4.56142E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.85 using 59 PHA bins.
# Reduced chi-squared = 1.087 for 56 degrees of freedom
# Null hypothesis probability = 3.055649e-01
Photon flux (15-150 keV) in 1 sec: 2.44395 ( -0.30634 0.30663 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.27755e-07 ( -2.0733e-08 2.3126e-08 ) ergs/cm2
Band function
Time interval is from -0.462 sec. to 0.538 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.35484 ( 1.31268 1.31268 )
beta : -2.94025 ( 3.00135 0.843271 )
Epeak [keV] : 26.0474 ( -26.1838 11.2553 )
Norm@50keV : 5.38171E-02 ( -0.0279736 4290.45 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.45 using 59 PHA bins.
# Reduced chi-squared = 1.099 for 55 degrees of freedom
# Null hypothesis probability = 2.853923e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.35422e-07 ( -1.35415e-07 -1.9557e-08 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.49527 (-1.1192 1.2546)
R^2/D10^2 : 2.17105 (-0.925635 1.66829)
(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 2.952e-08 6.275e-09
25- 50 5.719e-08 1.095e-08
50-150 1.823e-08 6.840e-09
15-150 1.049e-07 1.853e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 42.3070 (-10.9527 16.9447)
Norm : 15.6718 (-3.24135 4.28771)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.664e-08 5.740e-09
25- 50 4.936e-08 6.685e-09
50-150 4.056e-08 1.354e-08
15-150 1.266e-07 1.905e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.91804 (-1.44197 2.38341)
R1^2/D10^2 : 30.0179 (-24.6133 261.052)
kT2 [keV] : 11.9336 (-2.5612 7.48068)
R2^2/D10^2 : 0.427983 (-0.38658 0.852865)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.756e-08 1.991e-08
25- 50 4.868e-08 2.576e-08
50-150 3.446e-08 2.115e-08
15-150 1.207e-07 6.330e-08
Plot creation:
Fri Feb 24 19:23:58 EST 2023