batgrbproduct analysis for trigger=1208389
batgrbproduct Analysis for Trigger=1208389
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): Sat Jan 13 14:17:11 EST 2024
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1208389/GCN5_download_cron
======================================================================
Trigger: 01208389 Segment: 000
BAT Trigger Time: 726773877.696 [s; MET]
Trigger Stop: 726773878.208 [s; MET]
UTC: 2024-01-12T17:37:24.977140 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 270.644133237923 Dec: 24.4866348399557 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 20.03
Image Trigger?: NO
Rate S/N Ratio: 74.0067564483136 [ if not an image trigger ]
Image S/N Ratio: 20.03
Flight Position: [ source = BAT ]
RA: 270.644133237923 Dec: 24.4866348399557 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 270.640618801914 Dec: 24.4948543598398 [deg; J2000]
{ 18h 02m 33.7s , +24d 29' 41.5" }
+/- 0.636406828160285 [arcmin] (estimated 90% radius based on SNR)
+/- 0.178770289585002 [arcmin] (formal 1-sigma fit error)
SNR: 58.009242362886
Angular difference between Flight and Ground position is 0.529189 arcmin
Partial Coding Fraction: 0.609375 [ including projection effects ]
Duration
T90: 4.89599990844727 +/- 0.33347267686936
Measured from: 0.184000134468079
to: 5.08000004291534 [s; relative to TRIGTIME]
T50: 2.53199994564056 +/- 0.0632455984401142
Measured from: 0.692000150680542
to: 3.22400009632111 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.128000020980835
to: 1.12800002098083 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.375999927520752
to: 7.21599996089935 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.373175 1.657427 0.953469 0.186882
0.032000 0.033847 0.027938 0.018863 [error]
Peak 0.451423 0.540315 0.301258 0.057735
0.015675 0.016840 0.013666 0.008051 [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 5.14e-07 7.24e-07 7.57e-07 1.45e-06 2.45e-06 3.45e-06 erg/cm2
Error 2.61e-08 2.16e-08 2.92e-08 1.21e-07 7.07e-08 1.43e-07 erg/cm2
Peak flux Power-law 5.42e+00 4.16e+00 2.14e+00 1.58e+00 1.24e+01 1.33e+01 ph/cm2/s
Error 3.62e-01 1.71e-01 1.18e-01 1.74e-01 5.29e-01 5.32e-01 ph/cm2/s
Fluence Cutoff-PL 4.69e-07 7.50e-07 7.75e-07 8.02e-07 2.37e-06 2.80e-06 erg/cm2
Error 3.29e-08 2.51e-08 3.17e-08 2.21e-07 8.07e-08 2.37e-07 erg/cm2
Peak flux Cutoff-PL 4.97e+00 4.33e+00 2.20e+00 9.54e-01 1.21e+01 1.25e+01 ph/cm2/s
Error 4.40e-01 2.01e-01 1.30e-01 2.90e-01 5.66e-01 6.58e-01 ph/cm2/s
Fluence Band 4.50e-07 7.58e-07 7.56e-07 1.12e-06 2.37e-06 3.10e-06 erg/cm2
Error 3.63e-08 2.80e-08 3.37e-08 -------- 7.89e-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 1.937 0.053 - - 3.51e-02 1.02e-03 68.380 57
CPL 1.476 0.231 57.3 8.7 5.92e-02 1.55e-02 55.470 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.961 0.072 - - 8.45e-02 3.60e-03 55.590 57
CPL 1.477 0.300 52.6 10.7 1.49e-01 5.36e-02 47.060 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: 4.416000 sec.
T50 in the 50-300 keV band: 2.368000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 7.592 -0.376 7.216
T90 4.896 0.184 5.080
T50 2.532 0.692 3.224
Peak 1.000 0.128 1.128
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
270.6406 +24.4949 0.0033 34.9 -37.6 4.4164 58.0 TRIG_01208389
------------------------------------------
Foreground time interval of the image:
-0.376 7.216 (delta_t = 7.592 [sec])
Background time interval of the image:
-60.696 -37.366 (delta_t = 23.330 [sec])
-36.696 -0.376 (delta_t = 36.320 [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 -0.376 sec. to 7.216 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.93686 ( -0.0528556 0.0532352 )
Norm@50keV : 3.51300E-02 ( -0.00102428 0.0010223 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.38 using 59 PHA bins.
# Reduced chi-squared = 1.200 for 57 degrees of freedom
# Null hypothesis probability = 1.437369e-01
Photon flux (15-150 keV) in 7.592 sec: 5.12227 ( -0.16313 0.163805 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.45353e-06 ( -7.06218e-08 7.06799e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.376 sec. to 7.216 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.47639 ( -0.236802 0.224325 )
Epeak [keV] : 57.3364 ( -6.58631 10.7757 )
Norm@50keV : 5.92239E-02 ( -0.0130271 0.0178962 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.47 using 59 PHA bins.
# Reduced chi-squared = 0.9905 for 56 degrees of freedom
# Null hypothesis probability = 4.949215e-01
Photon flux (15-150 keV) in 7.592 sec: 4.94195 ( -0.18155 0.18255 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.37327e-06 ( -8.08776e-08 8.04372e-08 ) ergs/cm2
Band function
Time interval is from -0.376 sec. to 7.216 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.19998 ( -0.374115 0.673512 )
beta : -2.20960 ( 2.20925 0.163268 )
Epeak [keV] : 48.9630 ( -10.8796 11.3954 )
Norm@50keV : 8.57825E-02 ( -0.032368 0.149828 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.78 using 59 PHA bins.
# Reduced chi-squared = 0.9597 for 55 degrees of freedom
# Null hypothesis probability = 5.598143e-01
Photon flux (15-150 keV) in 7.592 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.36657e-06 ( -2.36652e-06 -7.88429e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.7481 ( )
R^2/D10^2 : 0.908580 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 296.44 using 59 PHA bins.
# Reduced chi-squared = 5.2007 for 57 degrees of freedom
# Null hypothesis probability = 4.550692e-34
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.378e-07 1.264e-08
25- 50 8.016e-07 2.695e-08
50-150 8.141e-07 4.973e-08
15-150 1.853e-06 5.960e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 88.2404 (-8.0168 9.34137)
Norm : 22.6894 (-1.07273 1.13633)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.492e-07 1.906e-08
25- 50 7.564e-07 2.365e-08
50-150 1.138e-06 6.187e-08
15-150 2.343e-06 7.212e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.06743 (-0.794115 0.831012)
R1^2/D10^2 : 5.80223 (-1.78895 3.03611)
kT2 [keV] : 22.7698 (-2.60461 3.60896)
R2^2/D10^2 : 7.03748E-02 (-0.0313973 0.0469739)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.074e-07 3.758e-08
25- 50 7.701e-07 5.041e-08
50-150 1.140e-06 1.158e-07
15-150 2.317e-06 1.777e-07
Peak spectrum fit
Power-law model
Time interval is from 0.128 sec. to 1.128 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.96082 ( -0.0717665 0.0727884 )
Norm@50keV : 8.44668E-02 ( -0.00360504 0.0035874 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.59 using 59 PHA bins.
# Reduced chi-squared = 0.9753 for 57 degrees of freedom
# Null hypothesis probability = 5.281369e-01
Photon flux (15-150 keV) in 1 sec: 12.4471 ( -0.528623 0.530096 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.77597e-07 ( -3.23651e-08 3.24333e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.128 sec. to 1.128 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.47738 ( -0.310421 0.289263 )
Epeak [keV] : 52.5849 ( -8.36846 12.9765 )
Norm@50keV : 0.149454 ( -0.0423269 0.0649061 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.06 using 59 PHA bins.
# Reduced chi-squared = 0.8403 for 56 degrees of freedom
# Null hypothesis probability = 7.970120e-01
Photon flux (15-150 keV) in 1 sec: 12.0887 ( -0.5647 0.5664 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.52941e-07 ( -3.5789e-08 3.5688e-08 ) ergs/cm2
Band function
Time interval is from 0.128 sec. to 1.128 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.47735 ( -0.257354 0.341611 )
beta : -10.00000 ( 10 20 )
Epeak [keV] : 52.5762 ( -8.1379 12.9341 )
Norm@50keV : 0.149432 ( -0.0423479 0.0639164 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.06 using 59 PHA bins.
# Reduced chi-squared = 0.8555 for 55 degrees of freedom
# Null hypothesis probability = 7.682173e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 7.53518e-07 ( -7.53511e-07 -3.5147e-08 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.9249 ( )
R^2/D10^2 : 2.87853 ( )
(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 8.653e-08 7.275e-09
25- 50 2.703e-07 1.240e-08
50-150 2.302e-07 2.045e-08
15-150 5.870e-07 2.635e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 81.9198 (-9.77299 11.9135)
Norm : 56.9523 (-3.66021 3.95494)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.480e-07 8.850e-09
25- 50 2.450e-07 1.055e-08
50-150 3.514e-07 2.910e-08
15-150 7.444e-07 3.490e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.54564 (-0.841136 0.882644)
R1^2/D10^2 : 19.3945 (-6.91986 12.7608)
kT2 [keV] : 21.6026 (-2.69896 3.68984)
R2^2/D10^2 : 0.212000 (-0.100936 0.160694)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.423e-07 1.890e-08
25- 50 2.449e-07 2.390e-08
50-150 3.556e-07 5.585e-08
15-150 7.429e-07 7.700e-08
Plot creation:
Sat Jan 13 14:19:08 EST 2024