batgrbproduct analysis for trigger=1209631
batgrbproduct Analysis for Trigger=1209631
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): Fri Jan 19 23:53:13 EST 2024
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1209631/GCN5_download_cron
======================================================================
Trigger: 01209631 Segment: 000
BAT Trigger Time: 727358232 [s; MET]
Trigger Stop: 727358296 [s; MET]
UTC: 2024-01-19T11:56:39.241040 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 245.23769397303 Dec: -15.6167015289401 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 16.62
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 16.62
Flight Position: [ source = BAT ]
RA: 245.23769397303 Dec: -15.6167015289401 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 245.214278356324 Dec: -15.6255170341351 [deg; J2000]
{ 16h 20m 51.4s , -15d 37' 31.9" }
+/- 1.28913354531966 [arcmin] (estimated 90% radius based on SNR)
+/- 0.521834795628935 [arcmin] (formal 1-sigma fit error)
SNR: 21.1616700049859
Angular difference between Flight and Ground position is 1.452754 arcmin
Partial Coding Fraction: 0.9453125 [ including projection effects ]
Duration
T90: 308.996000051498 +/- 33.8381350291135
Measured from: -52.8479999303818
to: 256.148000121117 [s; relative to TRIGTIME]
T50: 163.284000039101 +/- 15.1710134036391
Measured from: -7.34799993038177
to: 155.936000108719 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -33.7799999713898
to: -32.7799999713898 [s; relative to TRIGTIME]
Total Fluence
Measured from: -66.960000038147
to: 317.287999987602 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 14.741437 1.175764 0.033731 -0.076643
0.148765 0.130651 0.106702 0.090848 [error]
Peak 0.051078 0.024614 0.009620 -0.000310
0.007584 0.006800 0.005818 0.004853 [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 4.88e-06 5.78e-07 2.93e-08 1.56e-09 5.48e-06 5.48e-06 erg/cm2
Error 4.02e-07 6.49e-08 8.60e-09 7.86e-10 3.97e-07 3.96e-07 erg/cm2
Peak flux Power-law 5.06e-01 2.07e-01 4.99e-02 1.46e-02 7.72e-01 7.78e-01 ph/cm2/s
Error 1.32e-01 6.97e-02 3.72e-02 2.20e-02 1.71e-01 1.74e-01 ph/cm2/s
Fluence Cutoff-PL 4.68e-06 4.31e-07 3.91e-10 1.06e-16 5.11e-06 5.11e-06 erg/cm2
Error 4.65e-07 7.75e-08 1.20e-09 5.71e-14 4.69e-07 4.69e-07 erg/cm2
Peak flux Cutoff-PL 5.10e-01 2.02e-01 4.67e-02 1.30e-02 7.71e-01 7.76e-01 ph/cm2/s
Error 1.31e-01 7.18e-02 3.66e-02 2.19e-02 1.71e-01 1.71e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 5.07e-01 2.07e-01 4.94e-02 1.43e-02 7.72e-01 7.77e-01 ph/cm2/s
Error -------- -------- 3.72e-02 -------- 1.71e-01 -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 6.301 0.274 - - 9.57e-05 2.29e-05 49.270 57
CPL 1.000 0.000 50.0 0.0 1.60e-03 0.00e+00 606.850 56
The chi2 of BB fit is 30.32 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 3.054 0.730 - - 2.70e-03 1.54e-03 66.980 57
CPL 1.971 0.610 0.9 10.5 1.30e-02 0.00e+00 68.300 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 384.248 -66.960 317.288
T90 308.996 -52.848 256.148
T50 163.284 -7.348 155.936
Peak 1.000 -33.780 -32.780
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
245.2143 -15.6255 0.0090 19.7 167.5 4.0578 21.2 TRIG_01209631
------------------------------------------
Foreground time interval of the image:
-13.899 73.801 (delta_t = 87.700 [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
-66.960000 75.680000
97.000000 184.130000
185.000000 185.340000
187.000000 194.755500
198.000000 205.770000
207.000000 221.190000
226.000000 239.740000
241.000000 248.850000
251.000000 315.100000
316.000000 317.288000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 6.30137 ( -0.274165 0.274598 )
Norm@50keV : 9.57165E-05 ( -2.06748e-05 2.51048e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.27 using 59 PHA bins.
# Reduced chi-squared = 0.8644 for 57 degrees of freedom
# Null hypothesis probability = 7.568435e-01
Photon flux (15-150 keV) in 346.8 sec: 0.534030 ( -0.041994 0.0424238 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.48468e-06 ( -3.9479e-07 3.983e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-66.960000 75.680000
97.000000 184.130000
185.000000 185.340000
187.000000 194.755500
198.000000 205.770000
207.000000 221.190000
226.000000 239.740000
241.000000 248.850000
251.000000 315.100000
316.000000 317.288000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 1.59547E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 606.85 using 59 PHA bins.
# Reduced chi-squared = 10.837 for 56 degrees of freedom
# Null hypothesis probability = 1.746534e-93
Photon flux (15-150 keV) in 346.8 sec: 0.497302 ( -0.050765 0.049585 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.1101e-06 ( -4.74353e-07 4.63151e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-66.960000 75.680000
97.000000 184.130000
185.000000 185.340000
187.000000 194.755500
198.000000 205.770000
207.000000 221.190000
226.000000 239.740000
241.000000 248.850000
251.000000 315.100000
316.000000 317.288000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.60226 ( )
beta : -8.57405 ( )
Epeak [keV] : 4.03045 ( )
Norm@50keV : 2.89392E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 189.28 using 59 PHA bins.
# Reduced chi-squared = 3.4414 for 55 degrees of freedom
# Null hypothesis probability = 1.217476e-16
Photon flux (15-150 keV) in 346.8 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] : 2.63158 (-0.127685 0.13977)
R^2/D10^2 : 168.928 (-59.5069 89.8951)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 30.32 using 59 PHA bins.
# Reduced chi-squared = 0.5318 for 57 degrees of freedom
# Null hypothesis probability = 9.985823e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.627e-06 6.052e-07
25- 50 4.167e-07 6.341e-08
50-150 2.148e-10 1.088e-10
15-150 5.044e-06 6.260e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 4.48447 (-0.311043 0.353792)
Norm : 178.821 (-54.0688 76.5398)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.787e-06 5.271e-07
25- 50 4.679e-07 5.688e-08
50-150 1.360e-09 6.535e-10
15-150 5.256e-06 5.531e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 0.901993 (-2.00189 8.00743)
R1^2/D10^2 : 1.09297E+06 (-1.27803e+06 3.6667e+07)
kT2 [keV] : 2.67817 (-0.158085 39.4278)
R2^2/D10^2 : 144.132 (-144.706 100.443)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.619e-06 6.913e-05
25- 50 4.329e-07 2.457e-05
50-150 3.526e-10 8.455e-06
15-150 5.052e-06 2.688e-04
Peak spectrum fit
Power-law model
Time interval is from -33.780 sec. to -32.780 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.05405 ( -0.611174 0.849771 )
Norm@50keV : 2.69906E-03 ( -0.00147536 0.00161199 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.98 using 59 PHA bins.
# Reduced chi-squared = 1.175 for 57 degrees of freedom
# Null hypothesis probability = 1.718291e-01
Photon flux (15-150 keV) in 1 sec: 0.772216 ( -0.171234 0.171528 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.3262e-08 ( -9.63986e-09 1.07145e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -33.780 sec. to -32.780 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.97117 ( -1.19883 0.0207913 )
Epeak [keV] : 0.949869 ( -0.676995 20.3186 )
Norm@50keV : 1.30427E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.30 using 59 PHA bins.
# Reduced chi-squared = 1.220 for 56 degrees of freedom
# Null hypothesis probability = 1.253364e-01
Photon flux (15-150 keV) in 1 sec: 0.771265 ( -0.171215 0.170288 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.29286e-08 ( -9.4077e-09 1.10656e-08 ) ergs/cm2
Band function
Time interval is from -33.780 sec. to -32.780 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -10.00000 ( 10 10 )
beta : -3.05410 ( -0.850089 0.610623 )
Epeak [keV] : 1.07206 ( -1.07206 -1.07206 )
Norm@50keV : 0.366825 ( -0.200522 0.219093 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.98 using 59 PHA bins.
# Reduced chi-squared = 1.218 for 55 degrees of freedom
# Null hypothesis probability = 1.289813e-01
Photon flux (15-150 keV) in 1 sec: 0.771669 ( 6.22833 -0.170903 ) 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] : 4.64332 (-1.44882 2.35604)
R^2/D10^2 : 8.51925 (-8.67873 53.2548)
(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 1.526e-08 9.175e-09
25- 50 8.267e-09 5.225e-09
50-150 2.319e-10 2.261e-10
15-150 2.376e-08 1.413e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 19.4077 (-9.71177 19.0037)
Norm : 9.44985 (-4.7464 16.532)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.428e-08 5.832e-09
25- 50 1.222e-08 6.222e-09
50-150 3.477e-09 2.718e-09
15-150 2.997e-08 1.225e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.65275 (-1.20685 1.45286)
R1^2/D10^2 : 141.897 (-131.293 16005.1)
kT2 [keV] : 11.7598 (-4.62642 8.56469)
R2^2/D10^2 : 0.110455 (-0.0998572 0.49735)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.507e-08 8.025e-09
25- 50 1.101e-08 6.630e-09
50-150 8.126e-09 5.470e-09
15-150 3.421e-08 1.794e-08
Plot creation:
Fri Jan 19 23:57:13 EST 2024