batgrbproduct analysis for trigger=1209451
batgrbproduct Analysis for Trigger=1209451
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 Jan 18 21:16:13 EST 2024
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1209451/GCN5_download_cron
======================================================================
Trigger: 01209451 Segment: 000
BAT Trigger Time: 727246728 [s; MET]
Trigger Stop: 727246848 [s; MET]
UTC: 2024-01-18T04:58:15.248680 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 299.657139379839 Dec: 35.0069325942332 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.7
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.7
Flight Position: [ source = BAT ]
RA: 299.657139379839 Dec: 35.0069325942332 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 299.570008670469 Dec: 34.9866822085788 [deg; J2000]
{ 19h 58m 16.8s , +34d 59' 12.1" }
+/- 8.00206872632702 [arcmin] (estimated 90% radius based on SNR)
+/- 5.83567588998375 [arcmin] (formal 1-sigma fit error)
SNR: 1.55894004409998
Angular difference between Flight and Ground position is 4.451589 arcmin
Partial Coding Fraction: 0.7578125 [ including projection effects ]
Duration
T90: 34.0439999103546 +/- 158.011020549888
Measured from: 7.60000014305115
to: 41.6440000534058 [s; relative to TRIGTIME]
T50: 73.8960000276566 +/- 137.379249606214
Measured from: 24.0760000944138
to: 97.9720001220703 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 68.8880000114441
to: 69.8880000114441 [s; relative to TRIGTIME]
Total Fluence
Measured from: -13.6560000181198
to: 163.664000034332 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.288739 1.338509 0.483661 0.061079
0.095590 0.097598 0.083634 0.074780 [error]
Peak 0.038426 0.008129 0.014131 0.000742
0.007309 0.007361 0.006326 0.005452 [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 4.19e-07 5.01e-07 4.32e-07 6.36e-07 1.58e-06 1.99e-06 erg/cm2
Error 5.11e-08 4.69e-08 7.62e-08 2.16e-07 1.74e-07 3.09e-07 erg/cm2
Peak flux Power-law 2.77e-01 1.56e-01 5.57e-02 2.61e-02 5.03e-01 5.15e-01 ph/cm2/s
Error 1.15e-01 6.72e-02 4.80e-02 4.80e-02 1.72e-01 1.82e-01 ph/cm2/s
Fluence Cutoff-PL 3.86e-07 5.63e-07 3.85e-07 1.13e-07 1.42e-06 1.45e-06 erg/cm2
Error 5.82e-08 6.61e-08 9.57e-08 1.91e-07 1.88e-07 2.62e-07 erg/cm2
Peak flux Cutoff-PL 2.77e-01 1.56e-01 5.56e-02 2.58e-02 5.02e-01 5.14e-01 ph/cm2/s
Error 1.14e-01 6.77e-02 5.05e-02 4.72e-02 1.71e-01 1.77e-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 2.212 0.183 - - 9.44e-04 1.21e-04 68.290 57
CPL 1.094 0.930 31.6 0.0 4.40e-03 0.00e+00 62.890 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.489 0.946 - - 2.58e-03 2.14e-03 60.420 57
CPL -10.000 0.735 19.2 2.9 9.68e+07 2.95e+08 60.150 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 177.320 -13.656 163.664
T90 34.044 7.600 41.644
T50 73.896 24.076 97.972
Peak 1.000 68.888 69.888
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
299.5700 +34.9867 0.1231 23.1 -59.6 0.4917 1.6 TRIG_01209451
------------------------------------------
Foreground time interval of the image:
-13.656 126.701 (delta_t = 140.357 [sec])
Background time interval of the image:
-60.000 -13.656 (delta_t = 46.344 [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 -13.656 sec. to 163.664 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.21250 ( -0.177232 0.188217 )
Norm@50keV : 9.44019E-04 ( -0.000121608 0.000119545 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.29 using 59 PHA bins.
# Reduced chi-squared = 1.198 for 57 degrees of freedom
# Null hypothesis probability = 1.453510e-01
Photon flux (15-150 keV) in 177.3 sec: 0.157320 ( -0.0141608 0.0141639 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.5765e-06 ( -1.71904e-07 1.76102e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -13.656 sec. to 163.664 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.09358 ( -1.01767 0.842947 )
Epeak [keV] : 31.6199 ( )
Norm@50keV : 4.39931E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.89 using 59 PHA bins.
# Reduced chi-squared = 1.123 for 56 degrees of freedom
# Null hypothesis probability = 2.456189e-01
Photon flux (15-150 keV) in 177.3 sec: 0.150751 ( -0.014745 0.014827 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.42078e-06 ( -1.77665e-07 1.98211e-07 ) ergs/cm2
Band function
Time interval is from -13.656 sec. to 163.664 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.09415 ( -0.742889 0.718182 )
beta : -10.00000 ( 10 1.30024e-06 )
Epeak [keV] : 31.6011 ( -5.8151 7.86178 )
Norm@50keV : 4.39677E-03 ( -0.00439677 0.0137155 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.89 using 59 PHA bins.
# Reduced chi-squared = 1.143 for 55 degrees of freedom
# Null hypothesis probability = 2.171815e-01
Photon flux (15-150 keV) in 177.3 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] : 9.01632 (-0.882249 0.965977)
R^2/D10^2 : 0.107325 (-0.0355602 0.0539693)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.23 using 59 PHA bins.
# Reduced chi-squared = 1.355 for 57 degrees of freedom
# Null hypothesis probability = 3.843608e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.015e-07 4.300e-08
25- 50 6.426e-07 7.420e-08
50-150 2.465e-07 6.737e-08
15-150 1.191e-06 1.348e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 46.6009 (-9.92312 14.2917)
Norm : 0.925169 (-0.13842 0.176765)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.942e-07 4.876e-08
25- 50 5.517e-07 5.922e-08
50-150 5.004e-07 1.369e-07
15-150 1.446e-06 1.712e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.12942 (-1.98206 1.92167)
R1^2/D10^2 : 1.32776 (-1.00728 45.2115)
kT2 [keV] : 12.2752 (-2.3413 4.05301)
R2^2/D10^2 : 2.50324E-02 (-0.0187047 0.0418478)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.910e-07 2.037e-07
25- 50 5.562e-07 2.511e-07
50-150 4.224e-07 2.413e-07
15-150 1.370e-06 6.623e-07
Peak spectrum fit
Power-law model
Time interval is from 68.888 sec. to 69.888 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.48872 ( -0.778234 1.11285 )
Norm@50keV : 2.57675E-03 ( -0.00257643 0.00169675 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.42 using 59 PHA bins.
# Reduced chi-squared = 1.060 for 57 degrees of freedom
# Null hypothesis probability = 3.533005e-01
Photon flux (15-150 keV) in 1 sec: 0.502709 ( -0.172384 0.172134 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.56872e-08 ( -1.17306e-08 1.36448e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 68.888 sec. to 69.888 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -10.0000 ( 10 11.4698 )
Epeak [keV] : 19.2361 ( -2.62101 3.11752 )
Norm@50keV : 9.67692E+07 ( -9.52852e+07 4.94978e+08 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.15 using 59 PHA bins.
# Reduced chi-squared = 1.074 for 56 degrees of freedom
# Null hypothesis probability = 3.281175e-01
Photon flux (15-150 keV) in 1 sec: 0.502448 ( -0.171967 0.169935 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.51911e-16 ( 0 0 ) ergs/cm2
Band function
Time interval is from 68.888 sec. to 69.888 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.26761 ( 1.58735 1.58735 )
beta : -2.87725 ( 2.55602 0.829058 )
Epeak [keV] : 18.8513 ( -9.91852 -9.91852 )
Norm@50keV : 156.165 ( -163.071 3.48157e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.82 using 59 PHA bins.
# Reduced chi-squared = 1.088 for 55 degrees of freedom
# Null hypothesis probability = 3.050224e-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] : 4.35328 (-1.24534 2.20955)
R^2/D10^2 : 7.39190 (-7.3919 33.39)
(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 9.983e-09 5.955e-09
25- 50 4.559e-09 3.295e-09
50-150 9.044e-11 9.960e-11
15-150 1.463e-08 8.930e-09
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 23.7979 (-16.0865 138.422)
Norm : 4.81710 (-3.09616 17.4819)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.536e-09 5.295e-09
25- 50 8.471e-09 5.477e-09
50-150 3.347e-09 3.160e-09
15-150 2.035e-08 1.289e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.90297 (-1.15822 1.66634)
R1^2/D10^2 : 11.3774 (-9.32293 61.9719)
kT2 [keV] : 28.5648 (-16.6081 -28.5557)
R2^2/D10^2 : 3.52333E-03 (-0.00350017 0.0216818)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.639e-09 5.875e-09
25- 50 5.886e-09 3.237e-09
50-150 1.645e-08 1.202e-08
15-150 3.198e-08 1.820e-08
Plot creation:
Thu Jan 18 21:18:23 EST 2024