batgrbproduct analysis for trigger=1274039
batgrbproduct Analysis for Trigger=1274039
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): Sat Dec 14 06:12:25 EST 2024
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1274039/GCN5_download_cron
======================================================================
Trigger: 01274039 Segment: 000
BAT Trigger Time: 755749174.848 [s; MET]
Trigger Stop: 755749175.872 [s; MET]
UTC: 2024-12-13T02:19:00.145500 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 116.147921531733 Dec: 35.280440225944 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 20.83
Image Trigger?: NO
Rate S/N Ratio: 127.59702190882 [ if not an image trigger ]
Image S/N Ratio: 20.83
Flight Position: [ source = BAT ]
RA: 116.147921531733 Dec: 35.280440225944 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 116.163354810704 Dec: 35.2685342405032 [deg; J2000]
{ 07h 44m 39.2s , +35d 16' 06.7" }
+/- 0.786150520569822 [arcmin] (estimated 90% radius based on SNR)
+/- 0.209019574556224 [arcmin] (formal 1-sigma fit error)
SNR: 42.8939402372322
Angular difference between Flight and Ground position is 1.040102 arcmin
Partial Coding Fraction: 0.4414062 [ including projection effects ]
Duration
T90: 10.3359999656677 +/- 3.11083785204133
Measured from: -3.70399987697601
to: 6.63200008869171 [s; relative to TRIGTIME]
T50: 2.51199996471405 +/- 0.195304953604232
Measured from: -0.359999895095825
to: 2.15200006961823 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.235999941825867
to: 1.23599994182587 [s; relative to TRIGTIME]
Total Fluence
Measured from: -10.7920000553131
to: 16.5359998941422 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.268946 2.103183 1.958025 0.598642
0.055648 0.061760 0.056332 0.043221 [error]
Peak 0.221630 0.457766 0.494933 0.143757
0.015524 0.020050 0.020462 0.014413 [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 4.12e-07 8.79e-07 1.47e-06 5.63e-06 4.05e-06 8.39e-06 erg/cm2
Error 2.70e-08 3.41e-08 5.47e-08 4.78e-07 1.39e-07 5.06e-07 erg/cm2
Peak flux Power-law 2.37e+00 3.14e+00 3.06e+00 5.32e+00 1.03e+01 1.39e+01 ph/cm2/s
Error 2.10e-01 1.74e-01 1.55e-01 5.55e-01 4.85e-01 6.99e-01 ph/cm2/s
Fluence Cutoff-PL 3.88e-07 8.94e-07 1.51e-06 4.09e-06 4.00e-06 6.88e-06 erg/cm2
Error 3.41e-08 3.70e-08 6.47e-08 1.17e-06 1.47e-07 1.15e-06 erg/cm2
Peak flux Cutoff-PL 2.02e+00 3.29e+00 3.33e+00 2.89e+00 1.01e+01 1.15e+01 ph/cm2/s
Error 2.57e-01 1.98e-01 2.00e-01 7.99e-01 4.93e-01 9.12e-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 1.256 0.058 - - 1.48e-02 4.80e-04 55.240 57
CPL 1.009 0.227 227.8 840.6 1.92e-02 4.40e-03 51.580 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.039 0.075 - - 8.95e-02 4.13e-03 53.910 57
CPL 0.368 0.332 137.3 50.0 1.82e-01 6.35e-02 40.060 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: 5.440000 sec.
T50 in the 50-300 keV band: 1.920000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 27.328 -10.792 16.536
T90 10.336 -3.704 6.632
T50 2.512 -0.360 2.152
Peak 1.000 0.236 1.236
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
116.1634 +35.2685 0.0045 28.8 91.6 6.1216 42.9 TRIG_01274039
------------------------------------------
Foreground time interval of the image:
-10.792 12.853 (delta_t = 23.645 [sec])
Background time interval of the image:
-146.647 -107.778 (delta_t = 38.869 [sec])
-106.848 -38.538 (delta_t = 68.310 [sec])
-37.848 -10.792 (delta_t = 27.056 [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 -10.792 sec. to 16.536 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.25604 ( -0.0579853 0.0577371 )
Norm@50keV : 1.48356E-02 ( -0.000480349 0.000480212 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.24 using 59 PHA bins.
# Reduced chi-squared = 0.9692 for 57 degrees of freedom
# Null hypothesis probability = 5.412996e-01
Photon flux (15-150 keV) in 27.33 sec: 1.75640 ( -0.0608041 0.060917 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.05137e-06 ( -1.38992e-07 1.39175e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -10.792 sec. to 16.536 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00866 ( -0.233437 0.221066 )
Epeak [keV] : 227.816 ( -83.03 1598.15 )
Norm@50keV : 1.91578E-02 ( -0.00376935 0.00504011 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.58 using 59 PHA bins.
# Reduced chi-squared = 0.9211 for 56 degrees of freedom
# Null hypothesis probability = 6.426787e-01
Photon flux (15-150 keV) in 27.33 sec: 1.73288 ( -0.06404 0.06413 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.00423e-06 ( -1.47063e-07 1.46571e-07 ) ergs/cm2
Band function
Time interval is from -10.792 sec. to 16.536 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.106798 ( -2.18115 -0.344339 )
beta : -1.31881 ( 1.31215 0.0803409 )
Epeak [keV] : 54.7018 ( -28.3163 225.31 )
Norm@50keV : 7.86364E-02 ( -0.0806715 396.99 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.19 using 59 PHA bins.
# Reduced chi-squared = 0.9307 for 55 degrees of freedom
# Null hypothesis probability = 6.210382e-01
Photon flux (15-150 keV) in 27.33 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] : 19.5436 ( )
R^2/D10^2 : 8.49760E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 230.86 using 59 PHA bins.
# Reduced chi-squared = 4.0503 for 57 degrees of freedom
# Null hypothesis probability = 8.718291e-23
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.725e-07 1.197e-08
25- 50 8.462e-07 4.550e-08
50-150 2.388e-06 1.295e-07
15-150 3.406e-06 1.257e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.362 ( )
Norm : 7.43243 ( )
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.058e-07 1.817e-08
25- 50 9.730e-07 3.416e-08
50-150 2.134e-06 7.488e-08
15-150 3.613e-06 1.421e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.91258 (-0.98435 1.105)
R1^2/D10^2 : 0.992392 (-0.333697 0.550848)
kT2 [keV] : 31.0760 (-3.20608 4.48974)
R2^2/D10^2 : 1.53569E-02 (-0.00559809 0.00704465)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.666e-07 4.018e-08
25- 50 9.110e-07 8.076e-08
50-150 2.742e-06 2.491e-07
15-150 4.019e-06 3.389e-07
Peak spectrum fit
Power-law model
Time interval is from 0.236 sec. to 1.236 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.03931 ( -0.0752053 0.0746262 )
Norm@50keV : 8.94693E-02 ( -0.00413034 0.0041285 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.91 using 59 PHA bins.
# Reduced chi-squared = 0.9458 for 57 degrees of freedom
# Null hypothesis probability = 5.916593e-01
Photon flux (15-150 keV) in 1 sec: 10.3254 ( -0.484835 0.48505 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.54344e-07 ( -4.80521e-08 4.81493e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.236 sec. to 1.236 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.367689 ( -0.344665 0.31977 )
Epeak [keV] : 137.272 ( -28.5697 71.4319 )
Norm@50keV : 0.181602 ( -0.0507503 0.0763104 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.06 using 59 PHA bins.
# Reduced chi-squared = 0.7153 for 56 degrees of freedom
# Null hypothesis probability = 9.467615e-01
Photon flux (15-150 keV) in 1 sec: 10.1461 ( -0.49273 0.4927 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.31172e-07 ( -5.0785e-08 5.0566e-08 ) ergs/cm2
Band function
Time interval is from 0.236 sec. to 1.236 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 9.40145E-02 ( -0.740048 2.06102 )
beta : -1.37890 ( 1.37688 0.216864 )
Epeak [keV] : 88.0804 ( -41.092 98.6483 )
Norm@50keV : 0.336833 ( -0.216484 7.2148 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.21 using 59 PHA bins.
# Reduced chi-squared = 0.7129 for 55 degrees of freedom
# Null hypothesis probability = 9.468116e-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] : 20.7095 (-1.18676 1.28583)
R^2/D10^2 : 0.458689 (-0.0807018 0.0959626)
(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 3.739e-08 3.390e-09
25- 50 1.905e-07 1.280e-08
50-150 6.082e-07 4.340e-08
15-150 8.361e-07 4.930e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 41.4963 ( )
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.033e-07 5.145e-09
25- 50 1.988e-07 1.135e-08
50-150 4.359e-07 6.675e-08
15-150 7.380e-07 4.220e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 10.3612 (-2.24244 2.50449)
R1^2/D10^2 : 2.13911 (-0.838953 1.82863)
kT2 [keV] : 34.4331 (-6.3822 14.5068)
R2^2/D10^2 : 7.01293E-02 (-0.047658 0.0755214)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.920e-08 1.258e-08
25- 50 2.009e-07 3.715e-08
50-150 6.777e-07 2.470e-07
15-150 9.378e-07 2.722e-07
Plot creation:
Sat Dec 14 06:15:47 EST 2024