batgrbproduct analysis for trigger=1180055
batgrbproduct Analysis for Trigger=1180055
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): Fri Jul 21 12:02:04 EDT 2023
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1180055/GCN5_download_cron
======================================================================
Trigger: 01180055 Segment: 000
BAT Trigger Time: 711530336 [s; MET]
Trigger Stop: 711530400 [s; MET]
UTC: 2023-07-20T07:18:24.324620 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 245.960257202829 Dec: -12.7263795644008 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 17.5
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 17.5
Flight Position: [ source = BAT ]
RA: 245.960257202829 Dec: -12.7263795644008 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 245.9526927222 Dec: -12.7257091973197 [deg; J2000]
{ 16h 23m 48.6s , -12d 43' 32.6" }
+/- 1.39619062878339 [arcmin] (estimated 90% radius based on SNR)
+/- 0.610546833068761 [arcmin] (formal 1-sigma fit error)
SNR: 18.8822827284352
Angular difference between Flight and Ground position is 0.444543 arcmin
Partial Coding Fraction: 0.625 [ including projection effects ]
Duration
T90: 486.767999887466 +/- 22.6768734530433
Measured from: -22.4199998378754
to: 464.348000049591 [s; relative to TRIGTIME]
T50: 209.896000027657 +/- 12.6336700654128
Measured from: 68.9480000734329
to: 278.844000101089 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -23.6720000505447
to: -22.6720000505447 [s; relative to TRIGTIME]
Total Fluence
Measured from: -44.5360000133514
to: 538.728000044823 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 26.273468 1.791065 -0.174968 -0.135322
0.211536 0.184818 0.157146 0.141290 [error]
Peak 0.069842 0.034946 0.003339 0.009040
0.010269 0.009053 0.007902 0.007361 [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 9.08e-06 8.56e-07 3.23e-08 1.26e-09 9.97e-06 9.97e-06 erg/cm2
Error 7.26e-07 8.94e-08 8.88e-09 5.94e-10 7.18e-07 7.18e-07 erg/cm2
Peak flux Power-law 7.44e-01 1.81e-01 2.28e-02 3.21e-03 9.50e-01 9.50e-01 ph/cm2/s
Error 1.83e-01 1.42e-01 3.32e-02 9.81e-03 2.31e-01 2.32e-01 ph/cm2/s
Fluence Cutoff-PL 8.51e-06 5.87e-07 7.24e-11 6.04e-20 9.10e-06 9.10e-06 erg/cm2
Error 8.92e-07 1.00e-07 2.84e-10 1.11e-16 9.00e-07 9.00e-07 erg/cm2
Peak flux Cutoff-PL 7.44e-01 1.79e-01 2.23e-02 3.09e-03 9.48e-01 9.49e-01 ph/cm2/s
Error 1.83e-01 -------- -------- -------- 2.31e-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 6.729 0.260 - - 6.87e-05 1.56e-05 84.230 57
CPL 1.000 0.000 50.0 0.0 1.26e-03 0.00e+00 726.660 56
The chi2 of BB fit is 52.41 which shows a significant improvement in the fit over a PL.
Check the BB fit.
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.987 1.179 - - 1.56e-03 1.62e-03 63.150 57
CPL 1.898 0.000 1.2 0.0 6.42e-02 0.00e+00 65.240 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 583.264 -44.536 538.728
T90 486.768 -22.420 464.348
T50 209.896 68.948 278.844
Peak 1.000 -23.672 -22.672
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
245.9527 -12.7257 0.0101 23.0 114.0 5.5269 18.9 TRIG_01180055
------------------------------------------
Foreground time interval of the image:
-19.499 73.701 (delta_t = 93.200 [sec])
Background time interval of the image:
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
-44.536000 178.740000
180.000000 228.960000
230.000000 306.760000
308.000000 330.480000
332.000000 393.650000
395.000000 538.728000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 6.72940 ( -0.260534 0.259947 )
Norm@50keV : 6.86737E-05 ( -1.41368e-05 1.70565e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 84.23 using 59 PHA bins.
# Reduced chi-squared = 1.478 for 57 degrees of freedom
# Null hypothesis probability = 1.100608e-02
Photon flux (15-150 keV) in 576.9 sec: 0.593556 ( -0.0458944 0.0463797 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.9682e-06 ( -7.14594e-07 7.20681e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-44.536000 178.740000
180.000000 228.960000
230.000000 306.760000
308.000000 330.480000
332.000000 393.650000
395.000000 538.728000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 1.26197E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 726.66 using 59 PHA bins.
# Reduced chi-squared = 12.976 for 56 degrees of freedom
# Null hypothesis probability = 2.151332e-117
Photon flux (15-150 keV) in 576.9 sec: 0.537139 ( -0.05952 0.057559 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.0991e-06 ( -9.15079e-07 8.85311e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-44.536000 178.740000
180.000000 228.960000
230.000000 306.760000
308.000000 330.480000
332.000000 393.650000
395.000000 538.728000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.60485 ( -6.31526 -4.60485 )
beta : -9.99061 ( 9.99061 19.8936 )
Epeak [keV] : 12.6669 ( -0.53003 0.452576 )
Norm@50keV : 8.87552E+04 ( -5200.8 214526 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.57 using 59 PHA bins.
# Reduced chi-squared = 0.9558 for 55 degrees of freedom
# Null hypothesis probability = 5.680950e-01
Photon flux (15-150 keV) in 576.9 sec: 0.657527 ( 6.34247 -0.063195 ) 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] : 2.48046 (-0.105451 0.114526)
R^2/D10^2 : 290.480 (-96.1767 140.21)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.41 using 59 PHA bins.
# Reduced chi-squared = 0.9195 for 57 degrees of freedom
# Null hypothesis probability = 6.476233e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.681e-06 1.038e-06
25- 50 6.182e-07 7.852e-08
50-150 1.808e-10 8.887e-11
15-150 9.300e-06 1.064e-06
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 4.07332 (-0.244146 0.274006)
Norm : 298.682 (-86.5039 119.257)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.975e-06 9.288e-07
25- 50 6.863e-07 8.054e-08
50-150 1.133e-09 5.620e-10
15-150 9.662e-06 9.980e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 0.409147 (-2.49366 -2.49366)
R1^2/D10^2 : 1.38445E+13 (-1.55895e+13 1.48597e+18)
kT2 [keV] : 2.49532 (-0.114604 0.124594)
R2^2/D10^2 : 274.463 (-97.4128 146.902)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.677e-06 9.340e+02
25- 50 6.191e-07 8.310e+03
50-150 1.827e-10 2.230e+05
15-150 9.296e-06 1.952e+05
Peak spectrum fit
Power-law model
Time interval is from -23.672 sec. to -22.672 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.98742 ( -0.960477 1.3971 )
Norm@50keV : 1.55678E-03 ( -0.00119255 0.00205314 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.15 using 59 PHA bins.
# Reduced chi-squared = 1.108 for 57 degrees of freedom
# Null hypothesis probability = 2.680053e-01
Photon flux (15-150 keV) in 1 sec: 0.949520 ( -0.231459 0.231232 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.39767e-08 ( -1.05243e-08 1.23898e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -23.672 sec. to -22.672 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.89776 ( )
Epeak [keV] : 1.16083 ( )
Norm@50keV : 6.41816E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.24 using 59 PHA bins.
# Reduced chi-squared = 1.165 for 56 degrees of freedom
# Null hypothesis probability = 1.863006e-01
Photon flux (15-150 keV) in 1 sec: 0.948003 ( -0.230601 0.232027 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.30907e-08 ( -9.6208e-09 1.33374e-08 ) ergs/cm2
Band function
Time interval is from -23.672 sec. to -22.672 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -9.81589 ( 9.81589 9.81589 )
beta : -3.98774 ( -1.39759 0.959314 )
Epeak [keV] : 1.89599 ( -1.89599 -1.89599 )
Norm@50keV : 0.211525 ( -0.162094 0.279025 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.15 using 59 PHA bins.
# Reduced chi-squared = 1.148 for 55 degrees of freedom
# Null hypothesis probability = 2.104163e-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] : 2.98089 (-0.82651 1.4373)
R^2/D10^2 : 126.213 (-126.929 1050.96)
(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 2.267e-08 1.301e-08
25- 50 3.232e-09 2.101e-09
50-150 4.942e-12 5.345e-12
15-150 2.591e-08 1.506e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.21926 (-3.98548 9.97805)
Norm : 48.3785 (-47.5866 288.049)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.221e-08 1.257e-08
25- 50 7.197e-09 4.344e-09
50-150 2.767e-10 2.961e-10
15-150 2.968e-08 1.745e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.25287 (-0.838529 1.05514)
R1^2/D10^2 : 615.032 (-1091.21 84117.5)
kT2 [keV] : 9.39034 (-3.77314 8.26784)
R2^2/D10^2 : 0.260186 (-0.305569 2.38057)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.986e-08 1.138e-08
25- 50 1.107e-08 7.070e-09
50-150 4.486e-09 3.972e-09
15-150 3.541e-08 1.884e-08
Plot creation:
Fri Jul 21 12:08:29 EDT 2023