batgrbproduct analysis for trigger=1161127
batgrbproduct Analysis for Trigger=1161127
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 Mar 23 18:45:17 EDT 2023
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1161127/GCN5_download_cron
======================================================================
Trigger: 01161127 Segment: 000
BAT Trigger Time: 701212268.864 [s; MET]
Trigger Stop: 701212269.888 [s; MET]
UTC: 2023-03-22T21:10:37.893100 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 16.5654750906929 Dec: -47.7287211073544 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9
Image Trigger?: NO
Rate S/N Ratio: 11.6189500386223 [ if not an image trigger ]
Image S/N Ratio: 9
Flight Position: [ source = BAT ]
RA: 16.5654750906929 Dec: -47.7287211073544 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 16.5502973375699 Dec: -47.7086793978087 [deg; J2000]
{ 01h 06m 12.1s , -47d 42' 31.2" }
+/- 1.74117332230218 [arcmin] (estimated 90% radius based on SNR)
+/- 0.60217148360678 [arcmin] (formal 1-sigma fit error)
SNR: 13.7739459255717
Angular difference between Flight and Ground position is 1.349584 arcmin
Partial Coding Fraction: 0.921875 [ including projection effects ]
Duration
T90: 11.6119999885559 +/- 2.1675138088266
Measured from: -2.03599989414215
to: 9.57600009441376 [s; relative to TRIGTIME]
T50: 3.92799985408783 +/- 1.6662834064257
Measured from: -0.551999807357788
to: 3.37600004673004 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.0199999809265137
to: 1.01999998092651 [s; relative to TRIGTIME]
Total Fluence
Measured from: -2.40799999237061
to: 11.1240000724792 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.295378 0.262481 0.133784 0.042950
0.029943 0.030577 0.025753 0.023110 [error]
Peak 0.052818 0.051367 0.019290 0.003885
0.008652 0.008877 0.007411 0.006024 [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 8.69e-08 1.13e-07 1.07e-07 1.80e-07 3.67e-07 4.87e-07 erg/cm2
Error 1.54e-08 1.41e-08 2.56e-08 8.62e-08 5.69e-08 1.14e-07 erg/cm2
Peak flux Power-law 5.09e-01 3.51e-01 1.59e-01 1.00e-01 1.07e+00 1.12e+00 ph/cm2/s
Error 1.30e-01 7.01e-02 5.50e-02 6.38e-02 2.08e-01 2.21e-01 ph/cm2/s
Fluence Cutoff-PL 8.65e-08 1.13e-07 1.08e-07 1.81e-07 3.68e-07 4.91e-07 erg/cm2
Error 1.53e-08 1.43e-08 2.55e-08 1.14e-07 5.59e-08 1.28e-07 erg/cm2
Peak flux Cutoff-PL 4.43e-01 4.24e-01 1.50e-01 1.58e-02 1.03e+00 1.03e+00 ph/cm2/s
Error 1.53e-01 1.01e-01 6.71e-02 4.86e-02 2.09e-01 2.11e-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 2.074 0.261 - - 2.93e-03 4.97e-04 42.440 57
CPL 2.525 0.527 187.1 0.0 1.75e-03 0.00e+00 41.260 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.144 0.364 - - 6.64e-03 1.77e-03 73.460 57
CPL 0.462 1.899 36.7 0.0 6.55e-02 0.00e+00 70.390 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 13.532 -2.408 11.124
T90 11.612 -2.036 9.576
T50 3.928 -0.552 3.376
Peak 1.000 0.020 1.020
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
16.5503 -47.7087 0.0140 25.1 -17.2 0.8112 13.8 TRIG_01161127
------------------------------------------
Foreground time interval of the image:
-2.408 11.124 (delta_t = 13.532 [sec])
Background time interval of the image:
-239.864 -204.664 (delta_t = 35.200 [sec])
-203.864 -24.814 (delta_t = 179.050 [sec])
-18.864 -18.417 (delta_t = 0.447 [sec])
-15.864 -15.594 (delta_t = 0.270 [sec])
-14.864 -2.408 (delta_t = 12.456 [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 -2.408 sec. to 11.124 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.07375 ( -0.250958 0.271992 )
Norm@50keV : 2.92635E-03 ( -0.000507421 0.000486768 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.44 using 59 PHA bins.
# Reduced chi-squared = 0.7446 for 57 degrees of freedom
# Null hypothesis probability = 9.246133e-01
Photon flux (15-150 keV) in 13.53 sec: 0.454515 ( -0.055742 0.0557568 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.66986e-07 ( -5.60881e-08 5.77006e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.408 sec. to 11.124 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.52496 ( -0.808777 0.244896 )
Epeak [keV] : 187.133 ( )
Norm@50keV : 1.74604E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.26 using 59 PHA bins.
# Reduced chi-squared = 0.7368 for 56 degrees of freedom
# Null hypothesis probability = 9.296611e-01
Photon flux (15-150 keV) in 13.53 sec: 0.454652 ( -0.056265 0.055627 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.68081e-07 ( -5.72157e-08 5.45205e-08 ) ergs/cm2
Band function
Time interval is from -2.408 sec. to 11.124 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.60100 ( 1.60211 1.60211 )
beta : -2.07291 ( 2.07325 0.250506 )
Epeak [keV] : 11.4317 ( -10.2483 -10.2483 )
Norm@50keV : 8.69820E-03 ( -0.00897828 0.0471079 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.44 using 59 PHA bins.
# Reduced chi-squared = 0.7717 for 55 degrees of freedom
# Null hypothesis probability = 8.921463e-01
Photon flux (15-150 keV) in 13.53 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] : 8.62323 (-1.34369 1.6425)
R^2/D10^2 : 0.355427 (-0.175159 0.340546)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.64 using 59 PHA bins.
# Reduced chi-squared = 1.152 for 57 degrees of freedom
# Null hypothesis probability = 2.022715e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.799e-08 1.546e-08
25- 50 1.350e-07 2.512e-08
50-150 4.510e-08 1.770e-08
15-150 2.481e-07 4.810e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 61.5746 (-21.2648 41.3465)
Norm : 2.31595 (-0.477809 0.638361)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.907e-08 1.266e-08
25- 50 1.213e-07 1.748e-08
50-150 1.410e-07 4.957e-08
15-150 3.414e-07 6.041e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.70435 (-1.66768 1.65534)
R1^2/D10^2 : 1.50574 (-0.926811 4.64848)
kT2 [keV] : 27.6234 (-11.3059 43.1669)
R2^2/D10^2 : 3.34864E-03 (-0.00302798 0.0108744)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.730e-08 4.008e-08
25- 50 1.066e-07 4.131e-08
50-150 1.928e-07 1.089e-07
15-150 3.867e-07 1.543e-07
Peak spectrum fit
Power-law model
Time interval is from 0.020 sec. to 1.020 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.14418 ( -0.340059 0.388666 )
Norm@50keV : 6.63823E-03 ( -0.00179931 0.00174158 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.46 using 59 PHA bins.
# Reduced chi-squared = 1.289 for 57 degrees of freedom
# Null hypothesis probability = 7.008416e-02
Photon flux (15-150 keV) in 1 sec: 1.06772 ( -0.208048 0.208048 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.19662e-08 ( -1.45206e-08 1.51745e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.020 sec. to 1.020 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.462057 ( -2.2481 1.54892 )
Epeak [keV] : 36.7371 ( )
Norm@50keV : 6.54964E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.39 using 59 PHA bins.
# Reduced chi-squared = 1.257 for 56 degrees of freedom
# Null hypothesis probability = 9.348889e-02
Photon flux (15-150 keV) in 1 sec: 1.03032 ( -0.207784 0.2094 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.58035e-08 ( -1.30272e-08 1.52619e-08 ) ergs/cm2
Band function
Time interval is from 0.020 sec. to 1.020 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.577652 ( -1.01657 2.35443 )
beta : -9.37167 ( 9.37167 19.3717 )
Epeak [keV] : 37.0679 ( -12.6436 15.5828 )
Norm@50keV : 5.50145E-02 ( -0.0551171 2.49462 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.40 using 59 PHA bins.
# Reduced chi-squared = 1.280 for 55 degrees of freedom
# Null hypothesis probability = 7.887847e-02
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.58138e-08 ( -5.58068e-08 -1.30667e-08 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 9.88433 (-1.85907 2.12939)
R^2/D10^2 : 0.545206 (-0.290951 0.662742)
(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 1.080e-08 3.909e-09
25- 50 2.642e-08 8.740e-09
50-150 1.333e-08 6.467e-09
15-150 5.056e-08 1.636e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 50.9730 (-19.2911 40.1666)
Norm : 6.11188 (-1.67832 2.44556)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.501e-08 4.159e-09
25- 50 2.170e-08 6.605e-09
50-150 2.146e-08 1.123e-08
15-150 5.817e-08 2.078e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 0.218541 (-0.358216 1.76418)
R1^2/D10^2 : 7.54866E+23 (-8.44967e+23 -8.45152e+23)
kT2 [keV] : 10.3475 (-1.89799 2.22245)
R2^2/D10^2 : 0.444804 (-0.237709 0.518883)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.427e-08 7.510e-09
25- 50 2.304e-08 1.288e-08
50-150 1.794e-08 1.043e-08
15-150 5.525e-08 2.932e-08
Plot creation:
Thu Mar 23 18:49:51 EDT 2023