batgrbproduct analysis for trigger=1231488
batgrbproduct Analysis for Trigger=1231488
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): Wed May 29 22:40:24 EDT 2024
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1231488/GCN5_download_cron
======================================================================
Trigger: 01231488 Segment: 000
BAT Trigger Time: 738644344.32 [s; MET]
Trigger Stop: 738644345.344 [s; MET]
UTC: 2024-05-29T02:58:30.788060 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 335.321551571704 Dec: 51.5552654293351 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.12
Image Trigger?: NO
Rate S/N Ratio: 25.2388589282479 [ if not an image trigger ]
Image S/N Ratio: 11.12
Flight Position: [ source = BAT ]
RA: 335.321551571704 Dec: 51.5552654293351 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 335.34144564852 Dec: 51.5567180543846 [deg; J2000]
{ 22h 21m 21.9s , +51d 33' 24.2" }
+/- 0.884216525192823 [arcmin] (estimated 90% radius based on SNR)
+/- 0.362746784725254 [arcmin] (formal 1-sigma fit error)
SNR: 36.2629556025623
Angular difference between Flight and Ground position is 0.747248 arcmin
Partial Coding Fraction: 0.2617188 [ including projection effects ]
Duration
T90: 175.659999966621 +/- 29.4640519053871
Measured from: -34.6439999341965
to: 141.016000032425 [s; relative to TRIGTIME]
T50: 65.9239999055862 +/- 1.65025575009855
Measured from: -11.1799999475479
to: 54.7439999580383 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.167999982833862
to: 1.16799998283386 [s; relative to TRIGTIME]
Total Fluence
Measured from: -70.9160000085831
to: 502.447999954224 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 8.811070 11.698731 8.980547 2.971011
0.203490 0.217227 0.196198 0.177497 [error]
Peak 0.194704 0.305248 0.278177 0.108185
0.019397 0.023043 0.021767 0.017425 [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 3.47e-06 5.74e-06 7.21e-06 1.80e-05 2.15e-05 3.45e-05 erg/cm2
Error 1.72e-07 1.63e-07 2.14e-07 1.24e-06 5.26e-07 1.34e-06 erg/cm2
Peak flux Power-law 2.39e+00 2.52e+00 1.89e+00 2.28e+00 7.68e+00 9.09e+00 ph/cm2/s
Error 3.32e-01 2.20e-01 1.75e-01 4.28e-01 6.23e-01 7.17e-01 ph/cm2/s
Fluence Cutoff-PL 3.42e-06 5.76e-06 7.25e-06 1.68e-05 2.14e-05 3.32e-05 erg/cm2
Error 2.13e-07 1.71e-07 2.38e-07 2.96e-06 5.73e-07 2.50e-06 erg/cm2
Peak flux Cutoff-PL 2.24e+00 2.60e+00 1.96e+00 1.64e+00 7.60e+00 8.45e+00 ph/cm2/s
Error 3.95e-01 2.53e-01 2.10e-01 7.23e-01 6.32e-01 1.03e+00 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 1.672 0.047 - - 4.05e-03 9.73e-05 58.420 57
CPL 1.650 0.127 908.5 -0.0 4.14e-03 5.21e-04 58.380 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.420 0.129 - - 6.28e-02 4.92e-03 58.150 57
CPL 1.100 0.459 150.0 -41.8 8.98e-02 5.07e-02 56.870 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: 130.048000 sec.
T50 in the 50-300 keV band: 44.416000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 573.364 -70.916 502.448
T90 175.660 -34.644 141.016
T50 65.924 -11.180 54.744
Peak 1.000 0.168 1.168
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
335.3414 +51.5567 0.0053 48.2 -152.0 16.0573 36.3 TRIG_01231488
------------------------------------------
Foreground time interval of the image:
-37.319 15.281 (delta_t = 52.600 [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
Multiple GTIs in the spectrum
tstart tstop
-70.916000 -44.050000
-43.320000 25.888800
26.680000 502.448000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.67161 ( -0.046753 0.046857 )
Norm@50keV : 4.04546E-03 ( -9.72638e-05 9.72614e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.42 using 59 PHA bins.
# Reduced chi-squared = 1.025 for 57 degrees of freedom
# Null hypothesis probability = 4.229571e-01
Photon flux (15-150 keV) in 571.8 sec: 0.532064 ( -0.0151041 0.0151784 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.14691e-05 ( -5.26258e-07 5.26663e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-70.916000 -44.050000
-43.320000 25.888800
26.680000 502.448000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.65002 ( -0.189065 0.0642451 )
Epeak [keV] : 908.495 ( -908.664 -908.676 )
Norm@50keV : 4.13706E-03 ( -0.000172851 0.000869281 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.38 using 59 PHA bins.
# Reduced chi-squared = 1.043 for 56 degrees of freedom
# Null hypothesis probability = 3.879286e-01
Photon flux (15-150 keV) in 571.8 sec: 0.529208 ( -0.015882 0.017774 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.14042e-05 ( -5.46584e-07 5.99704e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-70.916000 -44.050000
-43.320000 25.888800
26.680000 502.448000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -4.59649 ( 4.59649 4.59649 )
beta : -1.67161 ( -0.0468569 0.0467531 )
Epeak [keV] : 63.9192 ( -63.9192 -63.9192 )
Norm@50keV : 0.549835 ( -0.0132195 0.0132192 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.42 using 59 PHA bins.
# Reduced chi-squared = 1.062 for 55 degrees of freedom
# Null hypothesis probability = 3.508887e-01
Photon flux (15-150 keV) in 571.8 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] : 15.9095 ( )
R^2/D10^2 : 4.44610E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 465.69 using 59 PHA bins.
# Reduced chi-squared = 8.1699 for 57 degrees of freedom
# Null hypothesis probability = 1.850465e-65
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.332e-06 6.804e-08
25- 50 5.578e-06 1.961e-07
50-150 9.848e-06 4.289e-07
15-150 1.676e-05 4.574e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 172.046 (-20.5918 25.4252)
Norm : 2.11755 (-0.0651207 0.0697154)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.055e-06 1.550e-07
25- 50 5.777e-06 3.259e-07
50-150 1.208e-05 2.639e-06
15-150 2.091e-05 2.910e-06
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.57783 (-0.726744 0.785191)
R1^2/D10^2 : 0.443599 (-0.125422 0.193071)
kT2 [keV] : 28.5979 (-2.84918 3.84359)
R2^2/D10^2 : 4.23917E-03 (-0.0015247 0.00201774)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.842e-06 2.416e-07
25- 50 5.939e-06 3.019e-07
50-150 1.222e-05 7.662e-07
15-150 2.100e-05 1.046e-06
Peak spectrum fit
Power-law model
Time interval is from 0.168 sec. to 1.168 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.41994 ( -0.128665 0.129044 )
Norm@50keV : 6.27595E-02 ( -0.0049202 0.00491331 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.15 using 59 PHA bins.
# Reduced chi-squared = 1.020 for 57 degrees of freedom
# Null hypothesis probability = 4.326718e-01
Photon flux (15-150 keV) in 1 sec: 7.67824 ( -0.62219 0.623121 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.04007e-07 ( -5.10275e-08 5.11813e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.168 sec. to 1.168 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.09995 ( -0.535369 0.383504 )
Epeak [keV] : 149.961 ( -66.3341 -149.962 )
Norm@50keV : 8.98465E-02 ( -0.0303408 0.0710153 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.87 using 59 PHA bins.
# Reduced chi-squared = 1.016 for 56 degrees of freedom
# Null hypothesis probability = 4.424901e-01
Photon flux (15-150 keV) in 1 sec: 7.60479 ( -0.63198 0.63245 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.96644e-07 ( -5.3307e-08 5.2906e-08 ) ergs/cm2
Band function
Time interval is from 0.168 sec. to 1.168 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.90672 ( -14.2409 -4.90672 )
beta : -1.51558 ( -0.158127 0.148308 )
Epeak [keV] : 26.4087 ( -5.34453 4.70583 )
Norm@50keV : 3828.49 ( -297.204 25067.8 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.73 using 59 PHA bins.
# Reduced chi-squared = 0.9951 for 55 degrees of freedom
# Null hypothesis probability = 4.848981e-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] : 16.4876 (-1.64018 1.84508)
R^2/D10^2 : 0.649421 (-0.200497 0.28538)
(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 3.624e-08 5.715e-09
25- 50 1.564e-07 1.615e-08
50-150 3.005e-07 4.300e-08
15-150 4.932e-07 4.945e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-30.6182 -200)
Norm : 31.9620 (-2.49714 2.49714)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.959e-08 7.805e-09
25- 50 1.531e-07 1.875e-08
50-150 3.358e-07 9.235e-08
15-150 5.685e-07 1.290e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.11532 (-2.02673 2.40855)
R1^2/D10^2 : 4.81554 (-2.60659 7.17682)
kT2 [keV] : 31.0968 (-7.56997 19.59)
R2^2/D10^2 : 5.62904E-02 (-0.0444001 0.0585312)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.628e-08 1.868e-08
25- 50 1.561e-07 4.438e-08
50-150 3.794e-07 1.755e-07
15-150 6.017e-07 2.025e-07
Plot creation:
Wed May 29 22:44:00 EDT 2024