batgrbproduct analysis for trigger=1223470
batgrbproduct Analysis for Trigger=1223470
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): Mon Apr 22 07:19:30 EDT 2024
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1223470/GCN5_download_cron
======================================================================
Trigger: 01223470 Segment: 000
BAT Trigger Time: 735385407.36 [s; MET]
Trigger Stop: 735385408.384 [s; MET]
UTC: 2024-04-21T09:42:54.051140 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 299.685842854978 Dec: -14.8786960898768 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.05
Image Trigger?: NO
Rate S/N Ratio: 79.4984276574072 [ if not an image trigger ]
Image S/N Ratio: 11.05
Flight Position: [ source = BAT ]
RA: 299.685842854978 Dec: -14.8786960898768 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: Dec: [deg; J2000]
{ 00h 00m 00.0s , +00d 00' 00.0" }
+/- -inf [arcmin] (estimated 90% radius based on SNR)
+/- 0 [arcmin] (formal 1-sigma fit error)
SNR:
Angular difference between Flight and Ground position is 3684.205809 arcmin
Partial Coding Fraction: 0.04736328 [ including projection effects ]
Duration
T90: 24 +/- 9.21954445729289
Measured from: -19.3599998950958
to: 4.64000010490417 [s; relative to TRIGTIME]
T50: 6 +/- 2
Measured from: -5.35999989509583
to: 0.640000104904175 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.360000014305115
to: 0.639999985694885 [s; relative to TRIGTIME]
Total Fluence
Measured from: -30.3600000143051
to: 7.63999998569489 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.097433 3.304746 3.190959 0.728630
0.199258 0.206130 0.183049 0.131024 [error]
Peak 0.279493 0.577176 0.703580 0.118312
0.049087 0.060663 0.064553 0.039107 [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 9.38e-07 1.68e-06 2.29e-06 6.50e-06 6.62e-06 1.14e-05 erg/cm2
Error 1.06e-07 1.18e-07 1.74e-07 1.04e-06 4.38e-07 1.16e-06 erg/cm2
Peak flux Power-law 4.10e+00 4.57e+00 3.64e+00 4.80e+00 1.41e+01 1.71e+01 ph/cm2/s
Error 7.70e-01 5.67e-01 4.56e-01 1.15e+00 1.62e+00 1.94e+00 ph/cm2/s
Fluence Cutoff-PL 7.70e-07 1.80e-06 2.51e-06 2.48e-06 6.40e-06 7.56e-06 erg/cm2
Error 1.33e-07 1.41e-07 2.15e-07 1.18e-06 4.62e-07 1.23e-06 erg/cm2
Peak flux Cutoff-PL 2.63e+00 5.19e+00 4.60e+00 1.51e+00 1.36e+01 1.39e+01 ph/cm2/s
Error 9.21e-01 7.10e-01 6.57e-01 8.20e-01 1.63e+00 1.80e+00 ph/cm2/s
Fluence Band 7.44e-07 1.82e-06 2.46e-06 3.78e-06 6.39e-06 8.79e-06 erg/cm2
Error -------- 1.52e-07 -------- -------- 4.56e-07 -------- erg/cm2
Peak flux Band 2.65e+00 5.20e+00 4.60e+00 1.52e+00 1.36e+01 1.40e+01 ph/cm2/s
Error -------- 6.79e-01 6.17e-01 -------- -------- -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.547 0.104 - - 2.27e-02 1.45e-03 61.450 57
CPL 0.631 0.517 81.3 22.3 6.13e-02 3.60e-02 50.170 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.328 0.164 - - 1.17e-01 1.31e-02 67.040 57
CPL -0.547 1.003 76.2 16.0 8.52e-01 0.00e+00 51.520 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: 13.248000 sec.
T50 in the 50-300 keV band: 3.072000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 38.000 -30.360 7.640
T90 24.000 -19.360 4.640
T50 6.000 -5.360 0.640
Peak 1.000 -0.360 0.640
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
------------------------------------------
--> command terminated with status 0
Foreground time interval of the image:
-30.360 -29.480 (delta_t = 0.880 [sec])
-28.360 -27.490 (delta_t = 0.870 [sec])
-23.360 -18.190 (delta_t = 5.170 [sec])
-16.360 7.640 (delta_t = 24.000 [sec])
Background time interval of the image:
-239.360 -217.350 (delta_t = 22.010 [sec])
-215.360 -55.440 (delta_t = 159.920 [sec])
-34.360 -32.130 (delta_t = 2.230 [sec])
-31.360 -30.360 (delta_t = 1.000 [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
Multiple GTIs in the spectrum
tstart tstop
-30.360000 -29.480000
-28.360000 -27.490000
-23.360000 -18.190000
-16.360000 7.640000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.54746 ( -0.103753 0.104083 )
Norm@50keV : 2.27377E-02 ( -0.0014468 0.00144647 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.45 using 59 PHA bins.
# Reduced chi-squared = 1.078 for 57 degrees of freedom
# Null hypothesis probability = 3.197646e-01
Photon flux (15-150 keV) in 30.92 sec: 2.87636 ( -0.197344 0.198035 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.62099e-06 ( -4.37756e-07 4.38412e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-30.360000 -29.480000
-28.360000 -27.490000
-23.360000 -18.190000
-16.360000 7.640000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.630508 ( -0.547209 0.4861 )
Epeak [keV] : 81.2844 ( -12.7223 31.7869 )
Norm@50keV : 6.12863E-02 ( -0.0246042 0.0473616 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.17 using 59 PHA bins.
# Reduced chi-squared = 0.8960 for 56 degrees of freedom
# Null hypothesis probability = 6.939861e-01
Photon flux (15-150 keV) in 30.92 sec: 2.75837 ( -0.20591 0.2066 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.40427e-06 ( -4.63182e-07 4.60863e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-30.360000 -29.480000
-28.360000 -27.490000
-23.360000 -18.190000
-16.360000 7.640000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.452614 ( -0.616396 0.855935 )
beta : -2.24109 ( 2.22361 0.436757 )
Epeak [keV] : 73.6541 ( -17.2622 33.7185 )
Norm@50keV : 7.65472E-02 ( -0.0381372 0.142013 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.64 using 59 PHA bins.
# Reduced chi-squared = 0.9026 for 55 degrees of freedom
# Null hypothesis probability = 6.788349e-01
Photon flux (15-150 keV) in 30.92 sec: 2.74377 ( 4.25623 -0.2085 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.39194e-06 ( -6.39172e-06 -4.58296e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 16.2058 (-1.08502 1.17724)
R^2/D10^2 : 0.255736 (-0.0577726 0.0731359)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.79 using 59 PHA bins.
# Reduced chi-squared = 1.382 for 57 degrees of freedom
# Null hypothesis probability = 2.955341e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.281e-07 5.024e-08
25- 50 1.821e-06 1.565e-07
50-150 3.359e-06 3.693e-07
15-150 5.609e-06 4.514e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.359 (-46.2615 -199.363)
Norm : 11.8470 (-0.748532 0.421298)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.121e-07 6.833e-08
25- 50 1.755e-06 1.303e-07
50-150 3.848e-06 6.365e-07
15-150 6.515e-06 7.390e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.57235 (-1.77679 5.15763)
R1^2/D10^2 : 4.82204 (-4.06178 19.7831)
kT2 [keV] : 19.9165 (-2.34115 11.2328)
R2^2/D10^2 : 0.106955 (-0.0913806 0.07016)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.021e-07 3.497e-07
25- 50 1.722e-06 3.530e-07
50-150 3.729e-06 5.570e-07
15-150 6.253e-06 9.833e-07
Peak spectrum fit
Power-law model
Time interval is from -0.360 sec. to 0.640 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.32831 ( -0.162846 0.1642 )
Norm@50keV : 0.117477 ( -0.013066 0.0130644 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.04 using 59 PHA bins.
# Reduced chi-squared = 1.176 for 57 degrees of freedom
# Null hypothesis probability = 1.705492e-01
Photon flux (15-150 keV) in 1 sec: 14.0914 ( -1.61421 1.6172 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.15305e-06 ( -1.3657e-07 1.36989e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.360 sec. to 0.640 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.547028 ( -1.11479 0.890712 )
Epeak [keV] : 76.2156 ( -10.8753 21.0485 )
Norm@50keV : 0.852007 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.52 using 59 PHA bins.
# Reduced chi-squared = 0.9200 for 56 degrees of freedom
# Null hypothesis probability = 6.449256e-01
Photon flux (15-150 keV) in 1 sec: 13.5865 ( -1.6314 1.6361 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.12591e-06 ( -1.41761e-07 1.4234e-07 ) ergs/cm2
Band function
Time interval is from -0.360 sec. to 0.640 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.547328 ( -0.579583 1.82394 )
beta : -10.0000 ( 10 3.55271e-14 )
Epeak [keV] : 76.1996 ( -9.18432 21.0338 )
Norm@50keV : 0.852449 ( -0.509895 1.75049 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.52 using 59 PHA bins.
# Reduced chi-squared = 0.9367 for 55 degrees of freedom
# Null hypothesis probability = 6.083622e-01
Photon flux (15-150 keV) in 1 sec: 13.6221 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.12596e-06 ( 0 0 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 17.9898 (-1.81277 2.04714)
R^2/D10^2 : 1.01156 (-0.317689 0.444618)
(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 6.556e-08 1.309e-08
25- 50 3.031e-07 4.780e-08
50-150 7.119e-07 1.307e-07
15-150 1.081e-06 1.416e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-36.0237 -200)
Norm : 59.4267 (-6.62229 6.62229)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.480e-07 3.477e-08
25- 50 2.846e-07 1.398e-07
50-150 6.242e-07 3.386e-07
15-150 1.057e-06 5.106e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.78534 (-4.78622 -4.78622)
R1^2/D10^2 : 18.9218 (-18.9109 -18.9109)
kT2 [keV] : 19.3041 (-2.47449 -19.3043)
R2^2/D10^2 : 0.753732 (-0.753695 0.44024)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.337e-08 3.839e-08
25- 50 2.895e-07 8.430e-08
50-150 7.340e-07 2.086e-07
15-150 1.117e-06 2.539e-07
Plot creation:
Mon Apr 22 07:22:55 EDT 2024