batgrbproduct analysis for trigger=1182085
batgrbproduct Analysis for Trigger=1182085
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 Aug 4 08:49:36 EDT 2023
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1182085/batgroup_hand_proc
======================================================================
Trigger: 01182085 Segment: 000
BAT Trigger Time: 712651857.92 [s; MET]
Trigger Stop: 712651858.944 [s; MET]
UTC: 2023-08-02T06:50:26.167840 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 76.2208192215202 Dec: 19.5695249975392 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 16.03
Image Trigger?: NO
Rate S/N Ratio: 44.7772263544762 [ if not an image trigger ]
Image S/N Ratio: 16.03
Flight Position: [ source = BAT ]
RA: 76.2208192215202 Dec: 19.5695249975392 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 76.2241153687095 Dec: 19.5515868639114 [deg; J2000]
{ 05h 04m 53.8s , +19d 33' 05.7" }
+/- 0.749356066905046 [arcmin] (estimated 90% radius based on SNR)
+/- 0.215703674934492 [arcmin] (formal 1-sigma fit error)
SNR: 45.9340985099274
Angular difference between Flight and Ground position is 1.092302 arcmin
Partial Coding Fraction: 0.9921875 [ including projection effects ]
Duration
T90: 175.62399995327 +/- 18.2563879301769
Measured from: -1.77199995517731
to: 173.851999998093 [s; relative to TRIGTIME]
T50: 102.483999967575 +/- 50.6939396413585
Measured from: 5.01600003242493
to: 107.5 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.604000091552734
to: 1.60400009155273 [s; relative to TRIGTIME]
Total Fluence
Measured from: -6.03999996185303
to: 230.700000047684 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.474919 3.354800 2.194530 0.524125
0.102444 0.104649 0.087818 0.070547 [error]
Peak 0.046936 0.097887 0.129500 0.031619
0.007293 0.008171 0.008267 0.005820 [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 7.41e-07 1.28e-06 1.70e-06 4.57e-06 4.96e-06 8.29e-06 erg/cm2
Error 5.22e-08 5.28e-08 8.72e-08 5.20e-07 2.07e-07 5.78e-07 erg/cm2
Peak flux Power-law 4.19e-01 6.49e-01 7.55e-01 1.69e+00 2.32e+00 3.51e+00 ph/cm2/s
Error 6.98e-02 6.67e-02 5.98e-02 2.87e-01 1.82e-01 3.15e-01 ph/cm2/s
Fluence Cutoff-PL 6.97e-07 1.32e-06 1.73e-06 2.86e-06 4.83e-06 6.61e-06 erg/cm2
Error 6.49e-08 6.16e-08 9.36e-08 1.20e-06 2.39e-07 1.22e-06 erg/cm2
Peak flux Cutoff-PL 3.26e-01 6.67e-01 8.37e-01 8.38e-01 2.26e+00 2.67e+00 ph/cm2/s
Error 8.97e-02 7.46e-02 8.31e-02 4.05e-01 1.88e-01 4.40e-01 ph/cm2/s
Fluence Band 6.72e-07 1.33e-06 1.69e-06 3.75e-06 4.82e-06 7.47e-06 erg/cm2
Error -------- 6.97e-08 9.72e-08 -------- 2.29e-07 -------- 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 1.598 0.072 - - 2.24e-03 8.74e-05 56.740 57
CPL 1.276 0.300 114.3 233.1 3.22e-03 1.10e-03 53.120 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.781 0.131 - - 2.02e-02 1.62e-03 52.020 57
CPL -0.067 0.657 146.9 118.1 4.60e-02 3.12e-02 45.910 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: 23.680000 sec.
T50 in the 50-300 keV band: 11.328000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 236.740 -6.040 230.700
T90 175.624 -1.772 173.852
T50 102.484 5.016 107.500
Peak 1.000 0.604 1.604
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
76.2241 +19.5516 0.0042 11.1 147.8 3.5440 45.9 TRIG_01182085
------------------------------------------
Foreground time interval of the image:
-6.040 11.581 (delta_t = 17.621 [sec])
Background time interval of the image:
-37.419 -6.040 (delta_t = 31.379 [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 -6.040 sec. to 230.700 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.59763 ( -0.0718448 0.0721874 )
Norm@50keV : 2.23850E-03 ( -8.74706e-05 8.73182e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.74 using 59 PHA bins.
# Reduced chi-squared = 0.9955 for 57 degrees of freedom
# Null hypothesis probability = 4.846862e-01
Photon flux (15-150 keV) in 236.7 sec: 0.287447 ( -0.0116465 0.0116752 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.95669e-06 ( -2.06939e-07 2.07698e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -6.040 sec. to 230.700 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.27606 ( -0.310086 0.289046 )
Epeak [keV] : 114.337 ( -33.0923 433.097 )
Norm@50keV : 3.22224E-03 ( -0.000880303 0.00132298 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.12 using 59 PHA bins.
# Reduced chi-squared = 0.9486 for 56 degrees of freedom
# Null hypothesis probability = 5.844681e-01
Photon flux (15-150 keV) in 236.7 sec: 0.281379 ( -0.012767 0.012797 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.82724e-06 ( -2.39493e-07 2.38381e-07 ) ergs/cm2
Band function
Time interval is from -6.040 sec. to 230.700 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.02424 ( -0.46612 1.85433 )
beta : -1.79500 ( 1.79647 0.18831 )
Epeak [keV] : 75.7787 ( -43.2053 154.715 )
Norm@50keV : 4.52081E-03 ( -0.00194307 0.0483154 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.92 using 59 PHA bins.
# Reduced chi-squared = 0.9440 for 55 degrees of freedom
# Null hypothesis probability = 5.929939e-01
Photon flux (15-150 keV) in 236.7 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.81995e-06 ( -4.81829e-06 -2.27279e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.5087 ( )
R^2/D10^2 : 3.48962E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 178.08 using 59 PHA bins.
# Reduced chi-squared = 3.1241 for 57 degrees of freedom
# Null hypothesis probability = 2.204826e-14
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.658e-07 2.805e-08
25- 50 1.409e-06 6.675e-08
50-150 1.987e-06 1.510e-07
15-150 3.762e-06 1.775e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 184.928 (-37.1037 -184.325)
Norm : 1.16186 (-0.0484081 0.054672)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.913e-07 4.119e-08
25- 50 1.318e-06 1.399e-07
50-150 2.817e-06 8.107e-07
15-150 4.827e-06 9.847e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.78495 (-1.24967 1.29138)
R1^2/D10^2 : 0.210808 (-0.0782693 0.160071)
kT2 [keV] : 27.3270 (-4.636 7.89148)
R2^2/D10^2 : 2.74778E-03 (-0.00161313 0.00283106)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.158e-07 8.569e-08
25- 50 1.369e-06 1.296e-07
50-150 2.802e-06 5.106e-07
15-150 4.787e-06 7.953e-07
Peak spectrum fit
Power-law model
Time interval is from 0.604 sec. to 1.604 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.781229 ( -0.133141 0.129238 )
Norm@50keV : 2.01681E-02 ( -0.00162194 0.00161102 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.02 using 59 PHA bins.
# Reduced chi-squared = 0.9127 for 57 degrees of freedom
# Null hypothesis probability = 6.618426e-01
Photon flux (15-150 keV) in 1 sec: 2.31968 ( -0.18204 0.182312 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.37561e-07 ( -1.94956e-08 1.95573e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.604 sec. to 1.604 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -6.74050E-02 ( -0.711677 0.601629 )
Epeak [keV] : 146.877 ( -40.548 195.59 )
Norm@50keV : 4.60279E-02 ( -0.0200109 0.0423709 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.91 using 59 PHA bins.
# Reduced chi-squared = 0.8199 for 56 degrees of freedom
# Null hypothesis probability = 8.297201e-01
Photon flux (15-150 keV) in 1 sec: 2.25990 ( -0.18806 0.18752 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.30896e-07 ( -2.0925e-08 2.0703e-08 ) ergs/cm2
Band function
Time interval is from 0.604 sec. to 1.604 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.837193 ( 0.837193 0.837193 )
beta : -0.781229 ( -0.129112 0.133034 )
Epeak [keV] : 15.8920 ( -15.892 -15.892 )
Norm@50keV : 2.88905E-02 ( -0.0103253 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.02 using 59 PHA bins.
# Reduced chi-squared = 0.9459 for 55 degrees of freedom
# Null hypothesis probability = 5.891027e-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] : 24.8527 (-2.35817 2.76938)
R^2/D10^2 : 6.18489E-02 (-0.0168354 0.0219075)
(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 6.657e-09 1.013e-09
25- 50 3.765e-08 4.860e-09
50-150 1.726e-07 2.125e-08
15-150 2.169e-07 2.070e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 8.86735 ( )
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.208e-08 2.755e-09
25- 50 4.248e-08 1.268e-08
50-150 9.316e-08 4.651e-08
15-150 1.577e-07 5.735e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 18.4661 (-11.1584 5.84536)
R1^2/D10^2 : 0.118183 (-0.0683825 2.42171)
kT2 [keV] : 198.291 (-198.291 -198.291)
R2^2/D10^2 : 3.10596E-04 (-0.000161549 0.047836)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.845e-09 4.603e-09
25- 50 4.106e-08 2.190e-08
50-150 1.796e-07 9.119e-08
15-150 2.295e-07 1.122e-07
Plot creation:
Fri Aug 4 08:58:01 EDT 2023