batgrbproduct analysis for trigger=1267501
batgrbproduct Analysis for Trigger=1267501
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 Nov 14 09:36:24 EST 2024
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1267501/GCN5_download_cron
======================================================================
Trigger: 01267501 Segment: 000
BAT Trigger Time: 753176928.32 [s; MET]
Trigger Stop: 753176928.832 [s; MET]
UTC: 2024-11-13T07:48:13.793200 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 16.5765600663166 Dec: -22.667045457393 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.9
Image Trigger?: NO
Rate S/N Ratio: 18.7082869338697 [ if not an image trigger ]
Image S/N Ratio: 7.9
Flight Position: [ source = BAT ]
RA: 16.5765600663166 Dec: -22.667045457393 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 16.5781192402803 Dec: -22.6577310071079 [deg; J2000]
{ 01h 06m 18.7s , -22d 39' 27.8" }
+/- 1.64164054317955 [arcmin] (estimated 90% radius based on SNR)
+/- 0.62321527541127 [arcmin] (formal 1-sigma fit error)
SNR: 14.982292828591
Angular difference between Flight and Ground position is 0.565495 arcmin
Partial Coding Fraction: 0.9375 [ including projection effects ]
Duration
T90: 1.71200013160706 +/- 0.376595312407623
Measured from: 0.0720000267028809
to: 1.78400015830994 [s; relative to TRIGTIME]
T50: 0.688000082969666 +/- 0.229085068406694
Measured from: 0.328000068664551
to: 1.01600015163422 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.00400006771087646
to: 0.995999932289124 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.00799989700317383
to: 2.05599999427795 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.086985 0.080796 0.055783 0.020700
0.009079 0.009400 0.007952 0.006484 [error]
Peak 0.058862 0.066222 0.047665 0.006040
0.006535 0.006958 0.005988 0.004681 [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 2.22e-08 3.49e-08 4.12e-08 9.44e-08 1.26e-07 1.93e-07 erg/cm2
Error 4.06e-09 4.03e-09 7.84e-09 3.75e-08 1.79e-08 4.47e-08 erg/cm2
Peak flux Power-law 5.15e-01 4.73e-01 3.00e-01 2.92e-01 1.41e+00 1.58e+00 ph/cm2/s
Error 9.19e-02 5.32e-02 4.86e-02 9.47e-02 1.57e-01 1.79e-01 ph/cm2/s
Fluence Cutoff-PL 2.23e-08 3.49e-08 4.11e-08 9.29e-08 1.26e-07 1.91e-07 erg/cm2
Error 4.05e-09 4.03e-09 7.85e-09 3.60e-08 1.76e-08 5.98e-08 erg/cm2
Peak flux Cutoff-PL 5.16e-01 4.73e-01 2.99e-01 2.88e-01 1.41e+00 1.58e+00 ph/cm2/s
Error 9.17e-02 5.75e-02 4.95e-02 -------- 1.56e-01 2.10e-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 1.760 0.228 - - 6.66e-03 9.05e-04 45.760 57
CPL 1.764 0.346 9999.3 -0.0 6.66e-03 3.93e-03 45.770 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.655 0.203 - - 1.08e-02 1.33e-03 44.130 57
CPL 1.601 0.000 352.7 0.0 1.15e-02 0.00e+00 44.170 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: 1.472000 sec.
T50 in the 50-300 keV band: 0.704000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 2.048 0.008 2.056
T90 1.712 0.072 1.784
T50 0.688 0.328 1.016
Peak 1.000 -0.004 0.996
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
16.5781 -22.6577 0.0129 13.0 44.4 0.2540 15.0 TRIG_01267501
------------------------------------------
Foreground time interval of the image:
0.008 2.056 (delta_t = 2.048 [sec])
Background time interval of the image:
-239.320 -222.870 (delta_t = 16.450 [sec])
-215.320 -214.600 (delta_t = 0.720 [sec])
-213.320 -213.140 (delta_t = 0.180 [sec])
-211.320 -186.690 (delta_t = 24.630 [sec])
-185.320 -120.730 (delta_t = 64.590 [sec])
-119.320 -114.860 (delta_t = 4.460 [sec])
-113.320 -24.578 (delta_t = 88.742 [sec])
-23.320 0.008 (delta_t = 23.328 [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 0.008 sec. to 2.056 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.75952 ( -0.222691 0.232317 )
Norm@50keV : 6.66376E-03 ( -0.00091973 0.000891128 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.76 using 59 PHA bins.
# Reduced chi-squared = 0.8028 for 57 degrees of freedom
# Null hypothesis probability = 8.571157e-01
Photon flux (15-150 keV) in 2.048 sec: 0.904236 ( -0.104878 0.104939 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.25864e-07 ( -1.77139e-08 1.8058e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.008 sec. to 2.056 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.76445 ( -0.462821 0.228355 )
Epeak [keV] : 9999.33 ( -9999.35 -9999.36 )
Norm@50keV : 6.65919E-03 ( -0.00311766 0.0047447 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.77 using 59 PHA bins.
# Reduced chi-squared = 0.8173 for 56 degrees of freedom
# Null hypothesis probability = 8.336918e-01
Photon flux (15-150 keV) in 2.048 sec: 0.905062 ( -0.105469 0.104328 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.25652e-07 ( -1.75167e-08 1.75907e-08 ) ergs/cm2
Band function
Time interval is from 0.008 sec. to 2.056 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.45521 ( 1.45521 1.45521 )
beta : -1.75950 ( 1.7595 0.222559 )
Epeak [keV] : 14.1189 ( -14.1189 -14.1189 )
Norm@50keV : 1.58469E-02 ( -0.0100978 1.01107 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.76 using 59 PHA bins.
# Reduced chi-squared = 0.8320 for 55 degrees of freedom
# Null hypothesis probability = 8.081589e-01
Photon flux (15-150 keV) in 2.048 sec: ( ) 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] : 11.7275 (-2.20086 2.85538)
R^2/D10^2 : 0.224345 (-0.12013 0.256975)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 79.72 using 59 PHA bins.
# Reduced chi-squared = 1.399 for 57 degrees of freedom
# Null hypothesis probability = 2.515447e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.334e-08 3.185e-09
25- 50 4.084e-08 7.311e-09
50-150 3.325e-08 1.017e-08
15-150 8.742e-08 1.558e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 132.679 (-56.466 -130.739)
Norm : 3.71536 (-0.504045 0.727158)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.972e-08 3.438e-09
25- 50 3.587e-08 1.164e-08
50-150 6.714e-08 3.761e-08
15-150 1.227e-07 5.136e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.97879 (-1.22228 1.55909)
R1^2/D10^2 : 4.41384 (-2.92634 7.45112)
kT2 [keV] : 24.9723 (-6.26407 11.8035)
R2^2/D10^2 : 1.28425E-02 (-0.00914765 0.0223575)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.446e-08 1.204e-08
25- 50 3.013e-08 1.112e-08
50-150 7.532e-08 4.222e-08
15-150 1.299e-07 5.446e-08
Peak spectrum fit
Power-law model
Time interval is from -0.004 sec. to 0.996 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.65539 ( -0.199956 0.206661 )
Norm@50keV : 1.07744E-02 ( -0.00133902 0.00131199 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.13 using 59 PHA bins.
# Reduced chi-squared = 0.7743 for 57 degrees of freedom
# Null hypothesis probability = 8.936394e-01
Photon flux (15-150 keV) in 1 sec: 1.40938 ( -0.156704 0.156781 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.00153e-07 ( -1.31832e-08 1.33816e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.004 sec. to 0.996 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.60117 ( )
Epeak [keV] : 352.666 ( )
Norm@50keV : 1.15086E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.17 using 59 PHA bins.
# Reduced chi-squared = 0.7888 for 56 degrees of freedom
# Null hypothesis probability = 8.735889e-01
Photon flux (15-150 keV) in 1 sec: 1.40937 ( -0.15629 0.1563 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.98961e-08 ( -1.37458e-08 1.35769e-08 ) ergs/cm2
Band function
Time interval is from -0.004 sec. to 0.996 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.95920 ( -4.9592 -4.9592 )
beta : -1.68736 ( -0.227486 0.21105 )
Epeak [keV] : 19.4798 ( -19.4798 5.6028 )
Norm@50keV : 5931.85 ( -654.47 7.88103e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.79 using 59 PHA bins.
# Reduced chi-squared = 0.7963 for 55 degrees of freedom
# Null hypothesis probability = 8.613230e-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] : 13.1584 (-2.23115 2.68697)
R^2/D10^2 : 0.240698 (-0.114502 0.225551)
(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 8.837e-09 2.099e-09
25- 50 3.083e-08 4.835e-09
50-150 3.399e-08 8.660e-09
15-150 7.366e-08 1.159e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 163.860 (-162.746 -162.746)
Norm : 5.75947 (-0.675894 0.87435)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.467e-08 7.078e-09
25- 50 2.754e-08 1.464e-08
50-150 5.630e-08 3.177e-08
15-150 9.851e-08 5.430e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.53159 (-1.44062 1.77316)
R1^2/D10^2 : 4.01675 (-2.59244 9.89509)
kT2 [keV] : 24.6483 (-5.74972 10.5866)
R2^2/D10^2 : 2.16001E-02 (-0.0151447 0.0346931)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.669e-08 8.250e-09
25- 50 2.490e-08 9.223e-09
50-150 5.916e-08 3.260e-08
15-150 1.007e-07 4.570e-08
Plot creation:
Thu Nov 14 09:39:19 EST 2024