batgrbproduct analysis for trigger=1209635
batgrbproduct Analysis for Trigger=1209635
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 20 00:47:22 EST 2024
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1209635/GCN5_download_cron
======================================================================
Trigger: 01209635 Segment: 000
BAT Trigger Time: 727359656 [s; MET]
Trigger Stop: 727359720 [s; MET]
UTC: 2024-01-19T12:20:23.240940 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 256.3628982705 Dec: -37.846711347039 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 17.27
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 17.27
Flight Position: [ source = BAT ]
RA: 256.3628982705 Dec: -37.846711347039 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 256.46679644547 Dec: -37.8773341700641 [deg; J2000]
{ 17h 05m 52.0s , -37d 52' 38.4" }
+/- 2.84983376035844 [arcmin] (estimated 90% radius based on SNR)
+/- 1.34348678169965 [arcmin] (formal 1-sigma fit error)
SNR: 6.81359316460082
Angular difference between Flight and Ground position is 5.253387 arcmin
Partial Coding Fraction: 0.859375 [ including projection effects ]
Duration
T90: 526.68799996376 +/- 47.9654261468966
Measured from: -50.0479998588562
to: 476.640000104904 [s; relative to TRIGTIME]
T50: 256.079999923706 +/- 27.581099133443
Measured from: 43.1400001049042
to: 299.22000002861 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 6.74000000953674
to: 7.74000000953674 [s; relative to TRIGTIME]
Total Fluence
Measured from: -83.7799999713898
to: 531.184000015259 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 9.442026 8.865522 2.427213 0.309445
0.218034 0.190065 0.150899 0.124351 [error]
Peak 0.049921 0.042543 0.013901 0.002636
0.008677 0.007502 0.006050 0.004619 [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 3.62e-06 3.48e-06 2.33e-06 2.44e-06 1.04e-05 1.19e-05 erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Power-law 5.25e-01 2.85e-01 9.70e-02 4.29e-02 9.31e-01 9.51e-01 ph/cm2/s
Error 1.36e-01 6.61e-02 4.41e-02 3.59e-02 1.93e-01 1.98e-01 ph/cm2/s
Fluence Cutoff-PL 3.07e-06 3.87e-06 1.94e-06 3.11e-07 9.14e-06 9.18e-06 erg/cm2
Error 2.39e-07 1.58e-07 2.08e-07 1.74e-07 4.46e-07 4.84e-07 erg/cm2
Peak flux Cutoff-PL 5.12e-01 3.15e-01 7.34e-02 6.10e-03 9.06e-01 9.07e-01 ph/cm2/s
Error 1.45e-01 9.15e-02 6.91e-02 4.29e-02 1.98e-01 2.06e-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 2.578 0.000 - - 1.66e-03 0.00e+00 124.670 57
CPL 1.067 0.475 24.1 5.2 1.26e-02 9.03e-03 82.720 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.557 0.458 - - 4.58e-03 1.59e-03 44.990 57
CPL 1.504 0.000 15.3 0.0 2.31e-02 0.00e+00 44.360 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 614.964 -83.780 531.184
T90 526.688 -50.048 476.640
T50 256.080 43.140 299.220
Peak 1.000 6.740 7.740
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
256.4668 -37.8773 0.0281 24.4 -35.7 5.0853 6.8 TRIG_01209635
------------------------------------------
Foreground time interval of the image:
-83.780 460.401 (delta_t = 544.181 [sec])
Background time interval of the image:
-239.000 -83.780 (delta_t = 155.220 [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 -83.780 sec. to 531.184 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.57804 ( )
Norm@50keV : 1.65563E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 124.67 using 59 PHA bins.
# Reduced chi-squared = 2.1872 for 57 degrees of freedom
# Null hypothesis probability = 5.865889e-07
Photon flux (15-150 keV) in 615 sec: 0.341439 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.04106e-05 ( 0 0 ) ergs/cm2
Cutoff power-law model
Time interval is from -83.780 sec. to 531.184 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.06679 ( -0.500128 0.450609 )
Epeak [keV] : 24.0599 ( -6.45719 3.91226 )
Norm@50keV : 1.26205E-02 ( -0.0057491 0.0123023 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 82.72 using 59 PHA bins.
# Reduced chi-squared = 1.477 for 56 degrees of freedom
# Null hypothesis probability = 1.164286e-02
Photon flux (15-150 keV) in 615 sec: 0.309617 ( -0.01501 0.015143 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.13982e-06 ( -4.38495e-07 4.54116e-07 ) ergs/cm2
Band function
Time interval is from -83.780 sec. to 531.184 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.253834 ( -0.833459 1.34054 )
beta : -3.23665 ( -0.287448 0.265537 )
Epeak [keV] : 26.7704 ( -3.92129 2.32061 )
Norm@50keV : 4.37098E-02 ( -0.0469722 0.318691 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.79 using 59 PHA bins.
# Reduced chi-squared = 1.360 for 55 degrees of freedom
# Null hypothesis probability = 3.913990e-02
Photon flux (15-150 keV) in 615 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] : 8.28887 ( )
R^2/D10^2 : 0.289714 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 139.62 using 59 PHA bins.
# Reduced chi-squared = 2.4494 for 57 degrees of freedom
# Null hypothesis probability = 6.959216e-09
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.270e-06 1.436e-07
25- 50 4.221e-06 1.550e-07
50-150 1.244e-06 1.341e-07
15-150 7.735e-06 2.829e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 33.0153 (-2.39642 2.66202)
Norm : 2.41859 (-0.188618 0.206162)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.169e-06 1.633e-07
25- 50 3.810e-06 1.261e-07
50-150 2.357e-06 2.257e-07
15-150 9.336e-06 3.383e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.63886 (-0.961717 0.669141)
R1^2/D10^2 : 0.618664 (-0.153343 0.204028)
kT2 [keV] : 18.4966 (-6.32354 11.9579)
R2^2/D10^2 : 4.04796E-03 (-0.00220288 0.00873484)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.710e-06 2.955e-07
25- 50 3.931e-06 3.890e-07
50-150 2.421e-06 9.917e-07
15-150 9.062e-06 1.516e-06
Peak spectrum fit
Power-law model
Time interval is from 6.740 sec. to 7.740 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.55666 ( -0.420773 0.495854 )
Norm@50keV : 4.57595E-03 ( -0.00159264 0.00159227 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.99 using 59 PHA bins.
# Reduced chi-squared = 0.7892 for 57 degrees of freedom
# Null hypothesis probability = 8.753231e-01
Photon flux (15-150 keV) in 1 sec: 0.931063 ( -0.193282 0.193285 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.64912e-08 ( -1.16033e-08 1.22859e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 6.740 sec. to 7.740 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.50436 ( )
Epeak [keV] : 15.2921 ( )
Norm@50keV : 2.31415E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.36 using 59 PHA bins.
# Reduced chi-squared = 0.7921 for 56 degrees of freedom
# Null hypothesis probability = 8.693296e-01
Photon flux (15-150 keV) in 1 sec: 0.906244 ( -0.196513 0.199946 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.13767e-08 ( -1.19741e-08 1.58232e-08 ) ergs/cm2
Band function
Time interval is from 6.740 sec. to 7.740 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.897059 ( 0.336304 0.336304 )
beta : -3.22428 ( 3.11679 0.852844 )
Epeak [keV] : 23.2592 ( -21.4942 8.96456 )
Norm@50keV : 1.36381 ( -1.27286 1018.38 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.44 using 59 PHA bins.
# Reduced chi-squared = 0.7899 for 55 degrees of freedom
# Null hypothesis probability = 8.698148e-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] : 6.45499 (-1.24683 1.60506)
R^2/D10^2 : 2.49118 (-1.53618 3.90816)
(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 1.521e-08 6.053e-09
25- 50 1.771e-08 8.085e-09
50-150 2.168e-09 1.545e-09
15-150 3.508e-08 1.533e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 27.6967 (-10.5354 20.6263)
Norm : 8.04227 (-3.1026 5.66467)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.568e-08 4.833e-09
25- 50 1.711e-08 5.577e-09
50-150 8.418e-09 5.440e-09
15-150 4.121e-08 1.364e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.55631 (-5.649 1.78603)
R1^2/D10^2 : 4.20779 (-3.98274 -3.98274)
kT2 [keV] : 21.1663 (-23.045 -23.045)
R2^2/D10^2 : 7.28900E-03 (-0.0058721 3.26178)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.594e-08 9.885e-09
25- 50 1.604e-08 9.080e-09
50-150 1.146e-08 8.595e-09
15-150 4.345e-08 2.382e-08
Plot creation:
Sat Jan 20 00:51:30 EST 2024