batgrbproduct analysis for trigger=1202768
batgrbproduct Analysis for Trigger=1202768
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 17 17:29:21 EST 2023
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1202768/GCN5_download_cron
======================================================================
Trigger: 01202768 Segment: 000
BAT Trigger Time: 724457464 [s; MET]
Trigger Stop: 724457536 [s; MET]
UTC: 2023-12-16T22:10:31.440080 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 245.092742782378 Dec: -15.4292711794308 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 17.89
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 17.89
Flight Position: [ source = BAT ]
RA: 245.092742782378 Dec: -15.4292711794308 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 245.084123729054 Dec: -15.4783873715337 [deg; J2000]
{ 16h 20m 20.2s , -15d 28' 42.2" }
+/- 1.26849712199075 [arcmin] (estimated 90% radius based on SNR)
+/- 0.519038749569769 [arcmin] (formal 1-sigma fit error)
SNR: 21.6551886325592
Angular difference between Flight and Ground position is 2.988827 arcmin
Partial Coding Fraction: 0.4648438 [ including projection effects ]
Duration
T90: 625.111999988556 +/- 173.907989564521
Measured from: -68.9399999380112
to: 556.172000050545 [s; relative to TRIGTIME]
T50: 320.05999994278 +/- 32.4536326453263
Measured from: 35.392000079155
to: 355.452000021935 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 205.151999950409
to: 206.151999950409 [s; relative to TRIGTIME]
Total Fluence
Measured from: -93.3200000524521
to: 835.327999949455 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 38.696997 3.857040 -0.474785 -0.215940
0.314990 0.286223 0.245007 0.218211 [error]
Peak 0.074740 0.016142 0.016254 0.012960
0.010526 0.009545 0.008499 0.007182 [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 1.42e-05 1.81e-06 1.00e-07 5.88e-09 1.61e-05 1.61e-05 erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Power-law 7.70e-01 1.61e-01 1.68e-02 1.93e-03 9.49e-01 9.50e-01 ph/cm2/s
Error 1.88e-01 9.43e-02 2.60e-02 6.27e-03 2.44e-01 2.45e-01 ph/cm2/s
Fluence Cutoff-PL 1.34e-05 1.39e-06 1.22e-09 1.98e-16 1.48e-05 1.48e-05 erg/cm2
Error 1.28e-06 1.90e-07 2.78e-09 3.96e-14 1.29e-06 1.29e-06 erg/cm2
Peak flux Cutoff-PL 7.70e-01 1.58e-01 1.59e-02 1.77e-03 9.45e-01 9.47e-01 ph/cm2/s
Error 1.87e-01 7.60e-02 1.60e-02 6.22e-03 2.54e-01 2.44e-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 6.170 0.000 - - 1.19e-04 0.00e+00 118.480 57
CPL 1.000 0.000 50.0 0.0 1.53e-03 0.00e+00 847.040 56
The chi2 of BB fit is 87.23 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 4.257 1.105 - - 1.23e-03 1.51e-03 53.480 57
CPL -6.480 0.000 16.4 0.0 9.22e+05 0.00e+00 51.550 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 928.648 -93.320 835.328
T90 625.112 -68.940 556.172
T50 320.060 35.392 355.452
Peak 1.000 205.152 206.152
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
245.0841 -15.4784 0.0088 30.2 -111.6 47.8793 21.7 TRIG_01202768
------------------------------------------
Foreground time interval of the image:
-77.699 835.328 (delta_t = 913.027 [sec])
Background time interval of the image:
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 -93.320 sec. to 835.328 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 6.17027 ( )
Norm@50keV : 1.19366E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 118.48 using 59 PHA bins.
# Reduced chi-squared = 2.0786 for 57 degrees of freedom
# Null hypothesis probability = 3.321717e-06
Photon flux (15-150 keV) in 928.6 sec: 0.583209 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.61327e-05 ( 0 0 ) ergs/cm2
Cutoff power-law model
Time interval is from -93.320 sec. to 835.328 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 1.52623E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 847.04 using 59 PHA bins.
# Reduced chi-squared = 15.126 for 56 degrees of freedom
# Null hypothesis probability = 9.647110e-142
Photon flux (15-150 keV) in 928.6 sec: 0.532500 ( -0.052015 0.050992 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.47925e-05 ( -1.30663e-06 1.2797e-06 ) ergs/cm2
Band function
Time interval is from -93.320 sec. to 835.328 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -9.35794 ( )
beta : -6.20235 ( )
Epeak [keV] : 249.348 ( )
Norm@50keV : 1.57656E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 118.54 using 59 PHA bins.
# Reduced chi-squared = 2.1552 for 55 degrees of freedom
# Null hypothesis probability = 1.473045e-06
Photon flux (15-150 keV) in 928.6 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] : 2.73099 (-0.113609 0.123508)
R^2/D10^2 : 141.063 (-43.6657 61.7087)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 87.23 using 59 PHA bins.
# Reduced chi-squared = 1.530 for 57 degrees of freedom
# Null hypothesis probability = 6.126399e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.333e-05 1.398e-06
25- 50 1.383e-06 1.407e-07
50-150 1.000e-09 4.452e-10
15-150 1.472e-05 1.453e-06
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 4.70822 (-0.281958 0.316434)
Norm : 160.853 (-42.3373 56.6176)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.388e-05 1.212e-06
25- 50 1.526e-06 1.704e-07
50-150 5.788e-09 2.411e-09
15-150 1.541e-05 1.263e-06
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.74253 (-0.113606 0.123512)
R1^2/D10^2 : 135.859 (-43.6666 61.7066)
kT2 [keV] : 0.492374 (-1.7879 2.2274)
R2^2/D10^2 : 6.04189E+10 (-6.83263e+10 4.37787e+15)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Peak spectrum fit
Power-law model
Time interval is from 205.152 sec. to 206.152 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.25709 ( -0.973829 1.23601 )
Norm@50keV : 1.22558E-03 ( -0.00122558 0.00179421 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.48 using 59 PHA bins.
# Reduced chi-squared = 0.9382 for 57 degrees of freedom
# Null hypothesis probability = 6.080617e-01
Photon flux (15-150 keV) in 1 sec: 0.949083 ( -0.24301 0.245601 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.27468e-08 ( -9.9842e-09 1.18374e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 205.152 sec. to 206.152 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -6.47975 ( )
Epeak [keV] : 16.4122 ( )
Norm@50keV : 9.22349E+05 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.55 using 59 PHA bins.
# Reduced chi-squared = 0.9205 for 56 degrees of freedom
# Null hypothesis probability = 6.438655e-01
Photon flux (15-150 keV) in 1 sec: 0.944838 0.938136 0.929772 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 9.6105e-16 ( 0 0 ) ergs/cm2
Band function
Time interval is from 205.152 sec. to 206.152 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.70125 ( 1.83871 1.83871 )
beta : -8.69606 ( 9.61766 19.1066 )
Epeak [keV] : 15.1020 ( -5.73684 3.19652 )
Norm@50keV : 4267.92 ( -4268.14 66938.8 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.69 using 59 PHA bins.
# Reduced chi-squared = 0.9398 for 55 degrees of freedom
# Null hypothesis probability = 6.020109e-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] : 3.30606 (-0.686057 0.817945)
R^2/D10^2 : 73.8450 (-73.845 235.264)
(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 2.463e-08 1.402e-08
25- 50 4.978e-09 3.201e-09
50-150 1.698e-11 1.746e-11
15-150 2.962e-08 1.695e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 7.04316 (-2.30226 3.92583)
Norm : 74.0880 (-47.0387 164.933)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.376e-08 1.345e-08
25- 50 5.961e-09 3.990e-09
50-150 1.351e-10 1.458e-10
15-150 2.985e-08 1.748e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.21607 (-0.67989 0.789319)
R1^2/D10^2 : 84.9408 (-60.8679 278.581)
kT2 [keV] : 71.4575 (-50.0953 -71.4589)
R2^2/D10^2 : 5.48518E-04 (-0.000513756 0.0100053)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.438e-08 1.393e-08
25- 50 6.225e-09 3.303e-09
50-150 2.882e-08 1.746e-08
15-150 5.942e-08 3.037e-08
Plot creation:
Sun Dec 17 17:32:35 EST 2023