batgrbproduct analysis for trigger=1119268
batgrbproduct Analysis for Trigger=1119268
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): Sun Aug 7 19:37:20 EDT 2022
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1119268/GCN5_download_cron
======================================================================
Trigger: 01119268 Segment: 000
BAT Trigger Time: 681502149.44 [s; MET]
Trigger Stop: 681502150.464 [s; MET]
UTC: 2022-08-06T18:08:39.809960 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 260.873417061978 Dec: -26.0230362270796 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.93
Image Trigger?: NO
Rate S/N Ratio: 14.1774468787578 [ if not an image trigger ]
Image S/N Ratio: 9.93
Flight Position: [ source = BAT ]
RA: 260.873417061978 Dec: -26.0230362270796 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 260.858227450307 Dec: -26.0208761181198 [deg; J2000]
{ 17h 23m 26.0s , -26d 01' 15.2" }
+/- 2.01504834180229 [arcmin] (estimated 90% radius based on SNR)
+/- 0.91385656091076 [arcmin] (formal 1-sigma fit error)
SNR: 11.1795636298509
Angular difference between Flight and Ground position is 0.829179 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 4.77600002288818 +/- 1.99649685164083
Measured from: -0.0679999589920044
to: 4.70800006389618 [s; relative to TRIGTIME]
T50: 1.78799986839294 +/- 0.980489793840099
Measured from: 0.660000085830688
to: 2.44799995422363 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.763999938964844
to: 1.76399993896484 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.300000071525574
to: 6.66399991512299 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.206344 0.135096 0.017544 0.006165
0.020050 0.017850 0.014528 0.012586 [error]
Peak 0.070311 0.048975 0.009470 0.000623
0.008303 0.007247 0.005642 0.004695 [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 5.84e-08 4.91e-08 2.81e-08 2.38e-08 1.46e-07 1.59e-07 erg/cm2
Error 9.27e-09 8.63e-09 1.01e-08 1.56e-08 2.53e-08 3.34e-08 erg/cm2
Peak flux Power-law 6.91e-01 3.19e-01 8.93e-02 3.12e-02 1.12e+00 1.13e+00 ph/cm2/s
Error 1.37e-01 6.41e-02 3.91e-02 2.49e-02 1.78e-01 1.81e-01 ph/cm2/s
Fluence Cutoff-PL 5.75e-08 5.61e-08 1.02e-08 1.57e-10 1.24e-07 1.24e-07 erg/cm2
Error 1.01e-08 1.13e-08 1.30e-08 3.09e-09 2.22e-08 2.23e-08 erg/cm2
Peak flux Cutoff-PL 6.93e-01 3.18e-01 8.77e-02 3.06e-02 1.12e+00 1.13e+00 ph/cm2/s
Error 1.41e-01 7.60e-02 6.57e-02 3.11e-02 1.78e-01 1.89e-01 ph/cm2/s
Fluence Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 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 2.807 0.327 - - 1.89e-03 5.09e-04 36.930 57
CPL 0.497 2.690 19.3 0.0 7.73e-02 0.00e+00 31.790 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.838 0.430 - - 4.56e-03 1.52e-03 47.840 57
CPL 1.973 0.698 1.0 11.4 1.70e-02 0.00e+00 48.310 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 6.964 -0.300 6.664
T90 4.776 -0.068 4.708
T50 1.788 0.660 2.448
Peak 1.000 0.764 1.764
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
260.8582 -26.0209 0.0172 5.7 -49.0 0.3762 11.2 TRIG_01119268
------------------------------------------
Foreground time interval of the image:
-0.300 6.664 (delta_t = 6.964 [sec])
Background time interval of the image:
-148.139 -44.290 (delta_t = 103.849 [sec])
-43.440 -0.300 (delta_t = 43.140 [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 -0.300 sec. to 6.664 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.80660 ( -0.30757 0.347015 )
Norm@50keV : 1.89486E-03 ( -0.000499479 0.000517662 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.93 using 59 PHA bins.
# Reduced chi-squared = 0.6478 for 57 degrees of freedom
# Null hypothesis probability = 9.819937e-01
Photon flux (15-150 keV) in 6.964 sec: 0.454447 ( -0.0624464 0.0624681 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.46024e-07 ( -2.46522e-08 2.59724e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.300 sec. to 6.664 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.496595 ( -3.95148 1.42933 )
Epeak [keV] : 19.3454 ( )
Norm@50keV : 7.72802E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 31.79 using 59 PHA bins.
# Reduced chi-squared = 0.5677 for 56 degrees of freedom
# Null hypothesis probability = 9.962325e-01
Photon flux (15-150 keV) in 6.964 sec: 0.436073 ( -0.061444 0.061857 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.24003e-07 ( -2.03015e-08 2.40342e-08 ) ergs/cm2
Band function
Time interval is from -0.300 sec. to 6.664 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.74714 ( -2.64163 -1.0936 )
beta : -3.77753 ( 3.83782 0.946712 )
Epeak [keV] : 22.0205 ( -6.9285 4.1714 )
Norm@50keV : 3.97635 ( -3.9962 541.485 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 31.31 using 59 PHA bins.
# Reduced chi-squared = 0.5693 for 55 degrees of freedom
# Null hypothesis probability = 9.957945e-01
Photon flux (15-150 keV) in 6.964 sec: 0.0 ( ) 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] : 5.99633 (-0.768747 0.873563)
R^2/D10^2 : 1.69552 (-0.768062 1.44276)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 32.61 using 59 PHA bins.
# Reduced chi-squared = 0.5721 for 57 degrees of freedom
# Null hypothesis probability = 9.961274e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.636e-08 1.432e-08
25- 50 5.613e-08 1.318e-08
50-150 5.127e-09 2.797e-09
15-150 1.176e-07 2.580e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 21.3614 (-5.26398 7.58744)
Norm : 5.13639 (-1.47739 2.22965)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.854e-08 1.150e-08
25- 50 5.387e-08 1.325e-08
50-150 1.798e-08 9.714e-09
15-150 1.304e-07 2.524e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 11.4468 (-11.3514 -11.3514)
R1^2/D10^2 : 3.03908E-02 (-0.0368302 2.63825)
kT2 [keV] : 5.18736 (-5.12834 -5.12834)
R2^2/D10^2 : 2.66193 (-2.73889 -2.73889)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.799e-08 3.956e-08
25- 50 5.480e-08 3.576e-08
50-150 1.334e-08 8.479e-09
15-150 1.261e-07 8.339e-08
Peak spectrum fit
Power-law model
Time interval is from 0.764 sec. to 1.764 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.83825 ( -0.392419 0.467544 )
Norm@50keV : 4.55877E-03 ( -0.0015054 0.00153725 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.84 using 59 PHA bins.
# Reduced chi-squared = 0.8394 for 57 degrees of freedom
# Null hypothesis probability = 8.009053e-01
Photon flux (15-150 keV) in 1 sec: 1.11749 ( -0.178034 0.178043 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.10835e-08 ( -1.00897e-08 1.07053e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.764 sec. to 1.764 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.97339 ( -1.37634 0.0201229 )
Epeak [keV] : 1.00936 ( -0.613396 22.1209 )
Norm@50keV : 1.69509E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.31 using 59 PHA bins.
# Reduced chi-squared = 0.8626 for 56 degrees of freedom
# Null hypothesis probability = 7.578649e-01
Photon flux (15-150 keV) in 1 sec: 1.11702 ( -0.178034 0.17776 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.10059e-08 ( -1.23144e-08 1.07809e-08 ) ergs/cm2
Band function
Time interval is from 0.764 sec. to 1.764 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.73712 ( 1.73647 1.73647 )
beta : -2.83360 ( 2.83559 0.389888 )
Epeak [keV] : 3.33799 ( -3.2268 15.2015 )
Norm@50keV : 5.55781E-02 ( -0.0589607 8.52049e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.85 using 59 PHA bins.
# Reduced chi-squared = 0.8700 for 55 degrees of freedom
# Null hypothesis probability = 7.419788e-01
Photon flux (15-150 keV) in 1 sec: 0.0 ( ) 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] : 6.24343 (-1.11065 1.25172)
R^2/D10^2 : 3.30804 (-1.81644 4.63277)
(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 1.810e-08 5.924e-09
25- 50 1.966e-08 6.230e-09
50-150 2.113e-09 1.352e-09
15-150 3.987e-08 1.233e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 22.1129 (-6.92957 11.1174)
Norm : 11.8705 (-4.15895 7.38254)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.995e-08 4.410e-09
25- 50 1.882e-08 4.965e-09
50-150 6.639e-09 3.958e-09
15-150 4.541e-08 1.189e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 1.33140 (-1.04594 2.53134)
R1^2/D10^2 : 3.75517E+04 (-35609.2 -35632.4)
kT2 [keV] : 7.32287 (-1.45591 3.65733)
R2^2/D10^2 : 1.50156 (-1.31846 0.73516)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.901e-08 1.057e-08
25- 50 1.855e-08 1.066e-08
50-150 5.663e-09 4.183e-09
15-150 4.322e-08 2.306e-08
Plot creation:
Sun Aug 7 19:41:15 EDT 2022