batgrbproduct analysis for trigger=1202749
batgrbproduct Analysis for Trigger=1202749
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 14:17:06 EST 2023
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1202749/GCN5_download_cron
======================================================================
Trigger: 01202749 Segment: 000
BAT Trigger Time: 724444574.592 [s; MET]
Trigger Stop: 724444575.104 [s; MET]
UTC: 2023-12-16T18:35:42.032980 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 39.7587790592505 Dec: 33.5959734832109 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.94
Image Trigger?: NO
Rate S/N Ratio: 17.606816861659 [ if not an image trigger ]
Image S/N Ratio: 8.94
Flight Position: [ source = BAT ]
RA: 39.7587790592505 Dec: 33.5959734832109 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 39.7776592776759 Dec: 33.6135734526111 [deg; J2000]
{ 02h 39m 06.6s , +33d 36' 48.9" }
+/- 2.04896389974339 [arcmin] (estimated 90% radius based on SNR)
+/- 0.831456953464871 [arcmin] (formal 1-sigma fit error)
SNR: 10.9161468744233
Angular difference between Flight and Ground position is 1.416089 arcmin
Partial Coding Fraction: 0.59375 [ including projection effects ]
Duration
T90: 51.1519999504089 +/- 3.0617877107978
Measured from: -0.527999877929688
to: 50.6240000724792 [s; relative to TRIGTIME]
T50: 43.1559998989105 +/- 2.63611842320988
Measured from: 0.992000102996826
to: 44.1480000019073 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.508000016212463
to: 0.491999983787537 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.12000000476837
to: 51.3880000114441 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.487607 0.574312 0.481278 0.050981
0.060887 0.063470 0.055341 0.050935 [error]
Peak 0.047385 0.092611 0.063825 0.026802
0.010135 0.011273 0.010008 0.008299 [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 1.59e-07 2.69e-07 3.46e-07 8.98e-07 1.02e-06 1.67e-06 erg/cm2
Error 2.89e-08 3.07e-08 5.38e-08 2.93e-07 1.29e-07 3.39e-07 erg/cm2
Peak flux Power-law 5.68e-01 5.89e-01 4.32e-01 5.09e-01 1.79e+00 2.10e+00 ph/cm2/s
Error 1.40e-01 9.44e-02 7.76e-02 1.79e-01 2.72e-01 3.17e-01 ph/cm2/s
Fluence Cutoff-PL 1.48e-07 2.82e-07 3.56e-07 4.78e-07 9.91e-07 1.26e-06 erg/cm2
Error 3.41e-08 3.81e-08 5.87e-08 4.02e-07 1.38e-07 5.61e-07 erg/cm2
Peak flux Cutoff-PL 4.61e-01 6.79e-01 4.72e-01 1.43e-01 1.72e+00 1.75e+00 ph/cm2/s
Error 1.62e-01 1.31e-01 9.60e-02 -------- 2.79e-01 3.21e-01 ph/cm2/s
Fluence Band 1.47e-07 2.80e-07 3.55e-07 4.84e-07 9.91e-07 1.27e-06 erg/cm2
Error 3.30e-08 -------- -------- -------- -------- -------- 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 1.635 0.196 - - 2.09e-03 2.46e-04 45.940 57
CPL 1.196 0.769 90.4 -28.4 3.50e-03 3.83e-03 44.930 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.448 0.234 - - 1.45e-02 2.19e-03 54.030 57
CPL 0.087 1.414 67.6 55.7 7.47e-02 2.98e-01 49.590 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: 52.160000 sec.
T50 in the 50-300 keV band: 42.432000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 52.508 -1.120 51.388
T90 51.152 -0.528 50.624
T50 43.156 0.992 44.148
Peak 1.000 -0.508 0.492
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
39.7777 +33.6136 0.0177 38.7 -8.3 0.6954 10.9 TRIG_01202749
------------------------------------------
Foreground time interval of the image:
-1.120 10.109 (delta_t = 11.229 [sec])
Background time interval of the image:
-57.191 -1.120 (delta_t = 56.071 [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 -1.120 sec. to 51.388 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.63469 ( -0.193823 0.198453 )
Norm@50keV : 2.08644E-03 ( -0.000246983 0.000244269 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.94 using 59 PHA bins.
# Reduced chi-squared = 0.8060 for 57 degrees of freedom
# Null hypothesis probability = 8.526916e-01
Photon flux (15-150 keV) in 52.51 sec: 0.271079 ( -0.0308092 0.0308582 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.02055e-06 ( -1.27835e-07 1.29213e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.120 sec. to 51.388 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.19571 ( -0.872433 0.665456 )
Epeak [keV] : 90.4409 ( -33.5669 -90.441 )
Norm@50keV : 3.50288E-03 ( -0.00160878 0.00604659 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.93 using 59 PHA bins.
# Reduced chi-squared = 0.8024 for 56 degrees of freedom
# Null hypothesis probability = 8.553164e-01
Photon flux (15-150 keV) in 52.51 sec: 0.266048 ( -0.032096 0.031991 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.90858e-07 ( -1.37702e-07 1.38847e-07 ) ergs/cm2
Band function
Time interval is from -1.120 sec. to 51.388 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.19586 ( -0.500133 0.712648 )
beta : -10.0000 ( 10 1.77636e-15 )
Epeak [keV] : 90.4613 ( -33.6038 -90.4613 )
Norm@50keV : 3.50154E-03 ( -0.00160732 0.00605239 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.93 using 59 PHA bins.
# Reduced chi-squared = 0.8170 for 55 degrees of freedom
# Null hypothesis probability = 8.316599e-01
Photon flux (15-150 keV) in 52.51 sec: 0.265545 ( 6.73445 -0.030962 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.90785e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.1097 (-1.85755 2.17374)
R^2/D10^2 : 3.73398E-02 (-0.0150737 0.0247665)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.91 using 59 PHA bins.
# Reduced chi-squared = 1.086 for 57 degrees of freedom
# Null hypothesis probability = 3.053871e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.239e-08 1.775e-08
25- 50 3.088e-07 4.860e-08
50-150 4.064e-07 9.712e-08
15-150 7.976e-07 1.289e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 163.242 (-66.0083 -162.398)
Norm : 1.11272 (-0.133506 0.168328)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.489e-07 5.681e-08
25- 50 2.793e-07 1.477e-07
50-150 5.703e-07 3.261e-07
15-150 9.985e-07 5.453e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.72728 (-2.00165 4.11117)
R1^2/D10^2 : 1.14319 (-0.995271 15.4285)
kT2 [keV] : 19.3543 (-4.07862 12.282)
R2^2/D10^2 : 1.03584E-02 (-0.00876919 0.0153253)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.558e-07 7.675e-08
25- 50 2.596e-07 9.788e-08
50-150 5.374e-07 2.125e-07
15-150 9.528e-07 3.487e-07
Peak spectrum fit
Power-law model
Time interval is from -0.508 sec. to 0.492 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.44826 ( -0.233454 0.23432 )
Norm@50keV : 1.44971E-02 ( -0.0021904 0.0021833 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.03 using 59 PHA bins.
# Reduced chi-squared = 0.9480 for 57 degrees of freedom
# Null hypothesis probability = 5.870897e-01
Photon flux (15-150 keV) in 1 sec: 1.78578 ( -0.271439 0.272012 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.38776e-07 ( -2.25482e-08 2.27734e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.508 sec. to 0.492 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 8.68853E-02 ( -1.69571 1.133 )
Epeak [keV] : 67.5581 ( -16.5955 94.8292 )
Norm@50keV : 7.46624E-02 ( -0.0746779 0.521159 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.59 using 59 PHA bins.
# Reduced chi-squared = 0.8855 for 56 degrees of freedom
# Null hypothesis probability = 7.147059e-01
Photon flux (15-150 keV) in 1 sec: 1.72142 ( -0.27931 0.27874 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.26748e-07 ( -2.5336e-08 2.5595e-08 ) ergs/cm2
Band function
Time interval is from -0.508 sec. to 0.492 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.80135 ( -2.36025 -1.83202 )
beta : -2.10590 ( 2.10769 0.528339 )
Epeak [keV] : 46.0741 ( -8.30475 30.1753 )
Norm@50keV : 1.10750 ( -1.29857 53.1017 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.03 using 59 PHA bins.
# Reduced chi-squared = 0.8550 for 55 degrees of freedom
# Null hypothesis probability = 7.691833e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.30127e-07 ( -1.3012e-07 -2.3755e-08 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.1666 (-2.08311 2.59727)
R^2/D10^2 : 0.266857 (-0.121683 0.204177)
(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 1.130e-08 3.337e-09
25- 50 4.252e-08 8.405e-09
50-150 5.653e-08 1.763e-08
15-150 1.104e-07 2.425e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.360 (-82.5764 -199.362)
Norm : 7.43882 (-1.09931 1.10081)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.852e-08 1.076e-08
25- 50 3.563e-08 2.019e-08
50-150 7.815e-08 4.399e-08
15-150 1.323e-07 7.450e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 10.7151 (-3.60997 3.36554)
R1^2/D10^2 : 0.546505 (-0.281196 0.828284)
kT2 [keV] : 37.0197 (-34.689 -42.0929)
R2^2/D10^2 : 4.76463E-03 (-0.00311075 0.0809081)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.393e-08 8.085e-09
25- 50 4.155e-08 2.471e-08
50-150 7.394e-08 4.023e-08
15-150 1.294e-07 6.805e-08
Plot creation:
Sun Dec 17 14:20:23 EST 2023