batgrbproduct analysis for trigger=1185685
batgrbproduct Analysis for Trigger=1185685
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 Aug 17 18:50:12 EDT 2023
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1185685/GCN5_download_cron
======================================================================
Trigger: 01185685 Segment: 000
BAT Trigger Time: 713905880 [s; MET]
Trigger Stop: 713905944 [s; MET]
UTC: 2023-08-16T19:10:48.162020 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 299.776724433327 Dec: 35.3408655906575 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 14.25
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 14.25
Flight Position: [ source = BAT ]
RA: 299.776724433327 Dec: 35.3408655906575 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 299.679102598584 Dec: 35.3186434396602 [deg; J2000]
{ 19h 58m 43.0s , +35d 19' 07.1" }
+/- nan [arcmin] (estimated 90% radius based on SNR)
+/- 1.87185979707344 [arcmin] (formal 1-sigma fit error)
SNR: -3.99269212852311
Angular difference between Flight and Ground position is 4.961139 arcmin
Partial Coding Fraction: 0.90625 [ including projection effects ]
Duration
T90: 4.05199992656708 +/- 0.441714887612796
Measured from: 26.2880001068115
to: 30.3400000333786 [s; relative to TRIGTIME]
T50: 2.5919998884201 +/- 0.537207490157854
Measured from: 27.0240001678467
to: 29.6160000562668 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 26.9079999923706
to: 27.9079999923706 [s; relative to TRIGTIME]
Total Fluence
Measured from: 26.1759999990463
to: 30.7840000391006 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.035833 0.049492 0.011709 -0.011034
0.010739 0.010876 0.009382 0.007990 [error]
Peak 0.016991 0.027463 0.000918 -0.002149
0.006199 0.006302 0.005523 0.004718 [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 1.21e-08 1.57e-08 1.49e-08 2.50e-08 5.10e-08 6.76e-08 erg/cm2
Error 4.44e-09 4.87e-09 7.86e-09 2.94e-08 1.89e-08 3.60e-08 erg/cm2
Peak flux Power-law 1.91e-01 1.29e-01 5.71e-02 3.49e-02 3.95e-01 4.13e-01 ph/cm2/s
Error 8.16e-02 4.96e-02 3.61e-02 4.49e-02 1.44e-01 1.55e-01 ph/cm2/s
Fluence Cutoff-PL 1.06e-08 2.05e-08 1.12e-08 1.01e-09 4.33e-08 4.34e-08 erg/cm2
Error 5.35e-09 7.70e-09 1.12e-08 1.72e-08 1.78e-08 2.66e-08 erg/cm2
Peak flux Cutoff-PL 1.61e-01 2.12e-01 1.94e-02 1.71e-05 3.92e-01 3.92e-01 ph/cm2/s
Error 9.65e-02 7.91e-02 3.36e-02 2.54e-03 1.34e-01 1.34e-01 ph/cm2/s
Fluence Band 1.04e-08 2.06e-08 1.09e-08 3.34e-09 4.42e-08 4.58e-08 erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 1.26e-01 1.15e-01 6.71e-02 4.35e-02 3.32e-01 3.53e-01 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 2.075 0.541 - - 1.38e-03 5.51e-04 59.590 57
CPL -0.144 4.493 36.8 0.0 3.11e-02 2.16e+02 57.260 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.170 0.633 - - 2.43e-03 1.21e-03 67.780 57
CPL -4.382 0.330 31.9 7.0 5.04e+01 2.11e+05 61.670 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 4.608 26.176 30.784
T90 4.052 26.288 30.340
T50 2.592 27.024 29.616
Peak 1.000 26.908 27.908
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
299.6791 +35.3186 0.0481 23.2 167.7 -0.0860 -4.0 TRIG_01185685
------------------------------------------
Foreground time interval of the image:
26.176 28.390 (delta_t = 2.214 [sec])
29.000 30.784 (delta_t = 1.784 [sec])
Background time interval of the image:
-58.000 -57.506 (delta_t = 0.494 [sec])
-55.000 -53.920 (delta_t = 1.080 [sec])
-51.000 -50.669 (delta_t = 0.331 [sec])
-49.000 -48.440 (delta_t = 0.560 [sec])
-46.000 -44.870 (delta_t = 1.130 [sec])
-40.000 -37.190 (delta_t = 2.810 [sec])
-36.000 -35.960 (delta_t = 0.040 [sec])
-13.000 26.176 (delta_t = 39.176 [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
26.176000 28.390000
29.000000 30.784000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.07548 ( -0.489803 0.592827 )
Norm@50keV : 1.37548E-03 ( -0.000558577 0.000542507 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.59 using 59 PHA bins.
# Reduced chi-squared = 1.045 for 57 degrees of freedom
# Null hypothesis probability = 3.815792e-01
Photon flux (15-150 keV) in 3.998 sec: 0.213813 ( -0.0634292 0.0634937 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.09661e-08 ( -1.8184e-08 1.96197e-08 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
26.176000 28.390000
29.000000 30.784000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.143574 ( -6.65547 2.33036 )
Epeak [keV] : 36.8023 ( -36.7085 -36.7085 )
Norm@50keV : 3.11362E-02 ( -0.0420533 431.259 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.26 using 59 PHA bins.
# Reduced chi-squared = 1.023 for 56 degrees of freedom
# Null hypothesis probability = 4.279764e-01
Photon flux (15-150 keV) in 3.998 sec: 0.205241 ( -0.062518 0.063792 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.33127e-08 ( -1.5115e-08 2.04402e-08 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
26.176000 28.390000
29.000000 30.784000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.420488 ( -2.99495 -0.569019 )
beta : -10.0000 ( 10 20 )
Epeak [keV] : 36.6161 ( -11.8044 292.159 )
Norm@50keV : 4.63800E-02 ( -0.0463795 15.7451 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.25 using 59 PHA bins.
# Reduced chi-squared = 1.041 for 55 degrees of freedom
# Null hypothesis probability = 3.915765e-01
Photon flux (15-150 keV) in 3.998 sec: 0.209455 ( 6.79054 -0.0962 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.41763e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 9.27077 (-2.33146 3.13713)
R^2/D10^2 : 0.144278 (-0.144278 0.290599)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.42 using 59 PHA bins.
# Reduced chi-squared = 1.007 for 57 degrees of freedom
# Null hypothesis probability = 4.595330e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.794e-09 6.017e-09
25- 50 2.179e-08 1.288e-08
50-150 9.095e-09 6.825e-09
15-150 4.068e-08 2.505e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 53.0162 (-27.0137 91.0241)
Norm : 1.21045 (-0.458572 0.781651)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.198e-08 6.226e-09
25- 50 1.757e-08 1.068e-08
50-150 1.800e-08 1.379e-08
15-150 4.756e-08 2.641e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.20288 (-3.14714 145.247)
R1^2/D10^2 : 2.11064 (-2.54095 -2.54095)
kT2 [keV] : 9.99271 (-4.18893 -9.9844)
R2^2/D10^2 : 0.100961 (-0.101817 0.309371)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.055e-08 5.593e-09
25- 50 2.081e-08 1.335e-08
50-150 1.062e-08 7.706e-09
15-150 4.198e-08 2.455e-08
Peak spectrum fit
Power-law model
Time interval is from 26.908 sec. to 27.908 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.17049 ( -0.571114 0.695083 )
Norm@50keV : 2.42526E-03 ( -0.00120277 0.00121994 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.78 using 59 PHA bins.
# Reduced chi-squared = 1.189 for 57 degrees of freedom
# Null hypothesis probability = 1.553851e-01
Photon flux (15-150 keV) in 1 sec: 0.395135 ( -0.14381 0.144894 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.26604e-08 ( -9.69149e-09 1.08386e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 26.908 sec. to 27.908 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -4.38178 ( 5.46998 6.12926 )
Epeak [keV] : 31.9150 ( -6.40656 7.67063 )
Norm@50keV : 50.4260 ( -44.5963 421482 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.67 using 59 PHA bins.
# Reduced chi-squared = 1.101 for 56 degrees of freedom
# Null hypothesis probability = 2.804267e-01
Photon flux (15-150 keV) in 1 sec: 0.392315 ( -0.133302 0.13524 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.84943e-08 ( -6.5021e-09 7.4065e-09 ) ergs/cm2
Band function
Time interval is from 26.908 sec. to 27.908 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.29837 ( -4.87657 -4.29837 )
beta : -9.35306 ( 9.35316 19.3173 )
Epeak [keV] : 31.9913 ( -6.9378 7.52331 )
Norm@50keV : 43.8889 ( -43.8889 257.698 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.67 using 59 PHA bins.
# Reduced chi-squared = 1.121 for 55 degrees of freedom
# Null hypothesis probability = 2.497818e-01
Photon flux (15-150 keV) in 1 sec: 0.331509 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.85504e-08 ( 0 0 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.24043 (-2.00811 2.63303)
R^2/D10^2 : 0.459383 (-0.459386 0.903864)
(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 5.761e-09 3.589e-09
25- 50 1.061e-08 6.720e-09
50-150 3.068e-09 2.588e-09
15-150 1.944e-08 1.221e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 39.6668 (-20.225 66.0579)
Norm : 2.70923 (-1.22498 2.17621)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.204e-09 3.781e-09
25- 50 8.132e-09 4.970e-09
50-150 6.234e-09 5.350e-09
15-150 2.057e-08 1.360e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.21858 (-8.2294 -8.2294)
R1^2/D10^2 : 0.146335 (-0.146194 -0.146194)
kT2 [keV] : 8.24911 (-8.24216 -8.24216)
R2^2/D10^2 : 0.313305 (-0.31317 -0.31317)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.762e-09 1.381e-01
25- 50 1.061e-08 1.315e+00
50-150 3.067e-09 2.893e+01
15-150 1.944e-08 3.517e+01
Plot creation:
Thu Aug 17 18:55:41 EDT 2023