batgrbproduct analysis for trigger=1205744
batgrbproduct Analysis for Trigger=1205744
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): Tue Jan 2 16:35:07 EST 2024
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1205744/GCN5_download_cron
======================================================================
Trigger: 01205744 Segment: 000
BAT Trigger Time: 725833572.032 [s; MET]
Trigger Stop: 725833588.416 [s; MET]
UTC: 2024-01-01T20:25:39.377680 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 352.051640079299 Dec: 51.6452299783594 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.41
Image Trigger?: NO
Rate S/N Ratio: 12 [ if not an image trigger ]
Image S/N Ratio: 7.41
Flight Position: [ source = BAT ]
RA: 352.051640079299 Dec: 51.6452299783594 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 352.147939976433 Dec: 51.6472451355261 [deg; J2000]
{ 23h 28m 35.5s , +51d 38' 50.1" }
+/- 3.32441638875702 [arcmin] (estimated 90% radius based on SNR)
+/- 2.42249728714325 [arcmin] (formal 1-sigma fit error)
SNR: 5.4677751237902
Angular difference between Flight and Ground position is 3.587371 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 43.2639998197556 +/- 12.6242331615233
Measured from: 2.81600022315979
to: 46.0800000429153 [s; relative to TRIGTIME]
T50: 15.423999786377 +/- 18.203472162395
Measured from: 7.23200023174286
to: 22.6560000181198 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 10.2840000391006
to: 11.2840000391006 [s; relative to TRIGTIME]
Total Fluence
Measured from: 2.17599999904633
to: 48.2560000419617 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.275109 0.318182 0.208201 0.022932
0.042226 0.043020 0.037045 0.032765 [error]
Peak 0.017350 0.022840 0.015128 0.001570
0.006582 0.006597 0.005534 0.004926 [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 7.64e-08 1.25e-07 1.54e-07 3.76e-07 4.61e-07 7.31e-07 erg/cm2
Error 1.66e-08 1.83e-08 3.47e-08 1.72e-07 8.19e-08 2.06e-07 erg/cm2
Peak flux Power-law 1.76e-01 1.61e-01 1.02e-01 9.84e-02 4.81e-01 5.38e-01 ph/cm2/s
Error 8.18e-02 4.92e-02 4.46e-02 8.77e-02 1.45e-01 1.67e-01 ph/cm2/s
Fluence Cutoff-PL 7.01e-08 1.38e-07 1.53e-07 1.10e-07 4.27e-07 4.72e-07 erg/cm2
Error 1.93e-08 2.59e-08 3.95e-08 2.08e-07 9.12e-08 2.65e-07 erg/cm2
Peak flux Cutoff-PL 1.51e-01 1.81e-01 1.05e-01 2.90e-02 4.59e-01 4.66e-01 ph/cm2/s
Error 1.28e-01 6.98e-02 5.15e-02 9.89e-02 1.53e-01 2.37e-01 ph/cm2/s
Fluence Band 6.92e-08 1.38e-07 1.51e-07 1.76e-07 4.29e-07 5.39e-07 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 1.695 0.259 - - 1.08e-03 1.81e-04 57.810 57
CPL 0.884 1.263 61.0 -19.1 3.05e-03 9.60e-03 56.320 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.663 0.559 - - 3.66e-03 1.25e-03 64.140 57
CPL 0.568 3.866 59.2 0.0 1.44e-02 0.00e+00 63.750 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: 12.160000 sec.
T50 in the 50-300 keV band: 6.784000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 46.080 2.176 48.256
T90 43.264 2.816 46.080
T50 15.424 7.232 22.656
Peak 1.000 10.284 11.284
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
352.1479 +51.6472 0.0351 2.9 -73.8 0.5100 5.5 TRIG_01205744
------------------------------------------
Foreground time interval of the image:
2.176 48.256 (delta_t = 46.080 [sec])
Background time interval of the image:
-60.032 -26.402 (delta_t = 33.630 [sec])
-25.032 -11.492 (delta_t = 13.540 [sec])
-10.032 2.176 (delta_t = 12.208 [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 2.176 sec. to 48.256 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.69534 ( -0.252606 0.264852 )
Norm@50keV : 1.08061E-03 ( -0.000182788 0.000178515 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.81 using 59 PHA bins.
# Reduced chi-squared = 1.014 for 57 degrees of freedom
# Null hypothesis probability = 4.452116e-01
Photon flux (15-150 keV) in 46.08 sec: 0.143283 ( -0.0210081 0.0210123 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.6121e-07 ( -8.08054e-08 8.29246e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.176 sec. to 48.256 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.883853 ( -1.45898 1.06636 )
Epeak [keV] : 60.9582 ( -22.7319 -60.9572 )
Norm@50keV : 3.04910E-03 ( -0.00304931 0.0161437 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.32 using 59 PHA bins.
# Reduced chi-squared = 1.006 for 56 degrees of freedom
# Null hypothesis probability = 4.627290e-01
Photon flux (15-150 keV) in 46.08 sec: 0.139094 ( -0.021321 0.021801 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.26596e-07 ( -8.71972e-08 9.51819e-08 ) ergs/cm2
Band function
Time interval is from 2.176 sec. to 48.256 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.05330 ( 0.820141 0.820141 )
beta : -2.41159 ( 2.53299 3.91011 )
Epeak [keV] : 65.6083 ( -58.82 119.089 )
Norm@50keV : 2.45128E-03 ( -0.00333541 165.027 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.34 using 59 PHA bins.
# Reduced chi-squared = 1.024 for 55 degrees of freedom
# Null hypothesis probability = 4.246790e-01
Photon flux (15-150 keV) in 46.08 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.29329e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.3364 (-1.8819 2.25066)
R^2/D10^2 : 3.24106E-02 (-0.0148708 0.026686)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.24 using 59 PHA bins.
# Reduced chi-squared = 1.092 for 57 degrees of freedom
# Null hypothesis probability = 2.951365e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.816e-08 1.268e-08
25- 50 1.565e-07 3.537e-08
50-150 1.458e-07 4.864e-08
15-150 3.505e-07 7.235e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 125.714 (-55.3839 -123.175)
Norm : 0.603972 (-0.0962159 0.13819)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.234e-08 2.877e-08
25- 50 1.304e-07 7.012e-08
50-150 2.381e-07 1.511e-07
15-150 4.409e-07 2.290e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.72624 (-1.98992 4.35819)
R1^2/D10^2 : 1.39743 (-1.30897 8.38498)
kT2 [keV] : 15.0660 (-3.03377 7.72959)
R2^2/D10^2 : 1.39301E-02 (-0.0117293 0.0194517)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.158e-08 3.855e-08
25- 50 1.337e-07 6.212e-08
50-150 1.883e-07 1.081e-07
15-150 3.936e-07 1.844e-07
Peak spectrum fit
Power-law model
Time interval is from 10.284 sec. to 11.284 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.66324 ( -0.533496 0.58527 )
Norm@50keV : 3.66466E-03 ( -0.00128396 0.00121724 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.14 using 59 PHA bins.
# Reduced chi-squared = 1.125 for 57 degrees of freedom
# Null hypothesis probability = 2.405766e-01
Photon flux (15-150 keV) in 1 sec: 0.480625 ( -0.145264 0.145351 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.40388e-08 ( -1.20023e-08 1.26142e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 10.284 sec. to 11.284 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.568142 ( -6.14606 1.58565 )
Epeak [keV] : 59.1694 ( )
Norm@50keV : 1.43868E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.75 using 59 PHA bins.
# Reduced chi-squared = 1.138 for 56 degrees of freedom
# Null hypothesis probability = 2.227153e-01
Photon flux (15-150 keV) in 1 sec: 0.458652 ( -0.149625 0.156614 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.07405e-08 ( -1.17362e-08 1.49466e-08 ) ergs/cm2
Band function
Time interval is from 10.284 sec. to 11.284 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.560175 ( 0.985201 0.985201 )
beta : -4.40180 ( 4.08077 14.0808 )
Epeak [keV] : 59.0467 ( -59.0245 69.4264 )
Norm@50keV : 1.45589E-02 ( -0.0145426 701000 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.75 using 59 PHA bins.
# Reduced chi-squared = 1.159 for 55 degrees of freedom
# Null hypothesis probability = 1.959528e-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] : 12.9864 (-3.37194 4.86568)
R^2/D10^2 : 9.23351E-02 (-0.0923351 0.179335)
(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 3.303e-09 2.015e-09
25- 50 1.136e-08 6.435e-09
50-150 1.211e-08 8.210e-09
15-150 2.677e-08 1.627e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 139.127 (-91.4107 -136.456)
Norm : 2.00775 (-0.642008 1.02455)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.187e-09 3.090e-09
25- 50 9.506e-09 5.595e-09
50-150 1.817e-08 1.193e-08
15-150 3.287e-08 1.991e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 1.53747 (-1.99649 12.1548)
R1^2/D10^2 : 2312.47 (-2275.46 5.76692e+08)
kT2 [keV] : 14.0625 (-3.79374 6.45177)
R2^2/D10^2 : 6.57857E-02 (-0.0657458 0.0594367)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.790e-09 2.432e-09
25- 50 1.005e-08 6.015e-09
50-150 1.365e-08 9.370e-09
15-150 2.849e-08 1.651e-08
Plot creation:
Tue Jan 2 16:36:57 EST 2024