batgrbproduct analysis for trigger=1243868
batgrbproduct Analysis for Trigger=1243868
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 Jul 21 06:39:21 EDT 2024
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1243868/GCN5_download_cron
======================================================================
Trigger: 01243868 Segment: 000
BAT Trigger Time: 743127925.12 [s; MET]
Trigger Stop: 743127926.144 [s; MET]
UTC: 2024-07-20T00:24:51.280960 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 96.7003376506726 Dec: 30.341801542182 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.44
Image Trigger?: NO
Rate S/N Ratio: 42.7784992724149 [ if not an image trigger ]
Image S/N Ratio: 11.44
Flight Position: [ source = BAT ]
RA: 96.7003376506726 Dec: 30.341801542182 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 96.7275796342967 Dec: 30.2967390994066 [deg; J2000]
{ 06h 26m 54.6s , +30d 17' 48.3" }
+/- 2.7998393303685 [arcmin] (estimated 90% radius based on SNR)
+/- 1.37555476753539 [arcmin] (formal 1-sigma fit error)
SNR: 6.98806272175598
Angular difference between Flight and Ground position is 3.049762 arcmin
Partial Coding Fraction: 0.578125 [ including projection effects ]
Duration
T90: 181.847999930382 +/- 73.838119929261
Measured from: 0.112000107765198
to: 181.960000038147 [s; relative to TRIGTIME]
T50: 54.0879999399185 +/- 39.5553197231408
Measured from: 1.66000008583069
to: 55.7480000257492 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.439999938011169
to: 1.43999993801117 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.116000056266785
to: 193.919999957085 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.780077 1.000834 0.853296 0.276234
0.114653 0.116876 0.099743 0.085199 [error]
Peak 0.063101 0.104012 0.125033 0.047238
0.009556 0.011139 0.011341 0.009638 [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 2.32e-07 4.33e-07 6.23e-07 1.90e-06 1.77e-06 3.19e-06 erg/cm2
Error 4.92e-08 5.46e-08 9.88e-08 6.68e-07 2.38e-07 7.38e-07 erg/cm2
Peak flux Power-law 5.32e-01 7.49e-01 7.81e-01 1.50e+00 2.53e+00 3.56e+00 ph/cm2/s
Error 1.13e-01 9.55e-02 8.66e-02 3.67e-01 2.61e-01 4.16e-01 ph/cm2/s
Fluence Cutoff-PL 2.31e-07 4.33e-07 6.24e-07 1.90e-06 1.77e-06 3.20e-06 erg/cm2
Error 5.21e-08 5.74e-08 1.01e-07 1.15e-06 2.41e-07 8.17e-07 erg/cm2
Peak flux Cutoff-PL 5.19e-01 7.53e-01 7.91e-01 1.35e+00 2.53e+00 3.41e+00 ph/cm2/s
Error 1.33e-01 1.00e-01 1.03e-01 5.99e-01 2.66e-01 6.35e-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 1.473 0.219 - - 9.59e-04 1.16e-04 55.740 57
CPL 1.471 1.232 10000.0 0.0 9.62e-04 0.00e+00 55.740 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.939 0.181 - - 2.21e-02 2.25e-03 43.550 57
CPL 0.841 0.503 687.3 0.0 2.44e-02 1.52e-02 43.480 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: 63.744000 sec.
T50 in the 50-300 keV band: 35.456000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 194.036 -0.116 193.920
T90 181.848 0.112 181.960
T50 54.088 1.660 55.748
Peak 1.000 0.440 1.440
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
96.7276 +30.2967 0.0274 26.2 -73.6 2.0745 7.0 TRIG_01243868
------------------------------------------
Foreground time interval of the image:
-0.116 193.920 (delta_t = 194.036 [sec])
Background time interval of the image:
-239.120 -45.830 (delta_t = 193.290 [sec])
-45.120 -0.116 (delta_t = 45.004 [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 -0.116 sec. to 193.920 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.47334 ( -0.217447 0.21982 )
Norm@50keV : 9.58759E-04 ( -0.000116413 0.000115661 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.74 using 59 PHA bins.
# Reduced chi-squared = 0.9779 for 57 degrees of freedom
# Null hypothesis probability = 5.224698e-01
Photon flux (15-150 keV) in 194 sec: 0.118853 ( -0.0144581 0.0145006 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.77244e-06 ( -2.3667e-07 2.39214e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.116 sec. to 193.920 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.47062 ( -0.7291 1.73528 )
Epeak [keV] : 1.00000E+04 ( -10000 -10000 )
Norm@50keV : 9.61784E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.74 using 59 PHA bins.
# Reduced chi-squared = 0.9954 for 56 degrees of freedom
# Null hypothesis probability = 4.845936e-01
Photon flux (15-150 keV) in 194 sec: 0.118896 ( -0.014673 0.0144 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.77283e-06 ( -2.45292e-07 2.36992e-07 ) ergs/cm2
Band function
Time interval is from -0.116 sec. to 193.920 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.21109 ( 1.21109 1.21109 )
beta : -1.47333 ( -0.219685 0.217542 )
Epeak [keV] : 31.7372 ( -31.7372 -31.7372 )
Norm@50keV : 1.87413E-03 ( -0.00102852 23.1413 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.74 using 59 PHA bins.
# Reduced chi-squared = 1.013 for 55 degrees of freedom
# Null hypothesis probability = 4.468113e-01
Photon flux (15-150 keV) in 194 sec: 0.172859 ( ) 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] : 16.4458 (-2.6188 3.17183)
R^2/D10^2 : 9.61734E-03 (-0.00436049 0.00794151)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.23 using 59 PHA bins.
# Reduced chi-squared = 1.355 for 57 degrees of freedom
# Null hypothesis probability = 3.848254e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.037e-07 2.646e-08
25- 50 4.465e-07 8.487e-08
50-150 8.526e-07 2.010e-07
15-150 1.403e-06 2.354e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-67.0296 -200)
Norm : 0.486655 (-0.0576487 0.0576487)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.351e-07 1.331e-07
25- 50 4.523e-07 2.514e-07
50-150 9.920e-07 5.443e-07
15-150 1.679e-06 9.296e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.79027 (-2.41751 2.69857)
R1^2/D10^2 : 0.240685 (-0.17884 2.35314)
kT2 [keV] : 25.7439 (-6.35673 13.7339)
R2^2/D10^2 : 1.78120E-03 (-0.00134445 0.00314021)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.364e-07 1.260e-07
25- 50 4.074e-07 1.827e-07
50-150 1.117e-06 6.221e-07
15-150 1.761e-06 7.449e-07
Peak spectrum fit
Power-law model
Time interval is from 0.440 sec. to 1.440 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.939334 ( -0.182731 0.178519 )
Norm@50keV : 2.20696E-02 ( -0.00225453 0.00224769 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.55 using 59 PHA bins.
# Reduced chi-squared = 0.7640 for 57 degrees of freedom
# Null hypothesis probability = 9.052021e-01
Photon flux (15-150 keV) in 1 sec: 2.53482 ( -0.260469 0.260992 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.43992e-07 ( -2.7447e-08 2.76118e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.440 sec. to 1.440 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.841339 ( -0.745042 0.260744 )
Epeak [keV] : 687.323 ( -687.323 -687.323 )
Norm@50keV : 2.43964E-02 ( -0.00415845 0.0262025 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.48 using 59 PHA bins.
# Reduced chi-squared = 0.7765 for 56 degrees of freedom
# Null hypothesis probability = 8.887811e-01
Photon flux (15-150 keV) in 1 sec: 2.52593 ( -0.2663 0.26613 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.43112e-07 ( -2.8681e-08 2.8297e-08 ) ergs/cm2
Band function
Time interval is from 0.440 sec. to 1.440 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.821544 ( 0.821544 0.821544 )
beta : -0.939320 ( -0.178526 0.18291 )
Epeak [keV] : 38.6287 ( -38.6287 -38.6287 )
Norm@50keV : 3.35698E-02 ( -0.0137361 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.55 using 59 PHA bins.
# Reduced chi-squared = 0.7917 for 55 degrees of freedom
# Null hypothesis probability = 8.673364e-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] : 23.1676 (-3.19086 3.94456)
R^2/D10^2 : 7.84142E-02 (-0.0297036 0.0453551)
(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 7.601e-09 1.649e-09
25- 50 4.140e-08 6.860e-09
50-150 1.660e-07 3.060e-08
15-150 2.150e-07 3.060e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-20.0811 -200)
Norm : 9.99649 (-1.06893 1.06893)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.489e-08 1.385e-08
25- 50 4.789e-08 2.627e-08
50-150 1.050e-07 5.745e-08
15-150 1.778e-07 9.385e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.60192 (-3.75797 5.11986)
R1^2/D10^2 : 0.885917 (-0.62946 5.16091)
kT2 [keV] : 37.5506 (-10.8223 60.6225)
R2^2/D10^2 : 1.57837E-02 (-0.0144809 0.0306593)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.545e-08 8.214e-09
25- 50 4.470e-08 2.227e-08
50-150 1.854e-07 1.011e-07
15-150 2.456e-07 1.166e-07
Plot creation:
Sun Jul 21 06:42:40 EDT 2024