batgrbproduct analysis for trigger=1277428
batgrbproduct Analysis for Trigger=1277428
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 Dec 29 22:23:07 EST 2024
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1277428/batgroup_hand_proc
======================================================================
Trigger: 01277428 Segment: 000
BAT Trigger Time: 757129010.752 [s; MET]
Trigger Stop: 757129011.776 [s; MET]
UTC: 2024-12-29T01:36:15.955240 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 274.149125849278 Dec: 74.7138330676705 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 15.88
Image Trigger?: NO
Rate S/N Ratio: 39.7240481320824 [ if not an image trigger ]
Image S/N Ratio: 15.88
Flight Position: [ source = BAT ]
RA: 274.149125849278 Dec: 74.7138330676705 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 274.139639422753 Dec: 74.6943037113503 [deg; J2000]
{ 18h 16m 33.5s , +74d 41' 39.5" }
+/- 1.22698191870708 [arcmin] (estimated 90% radius based on SNR)
+/- 0.376325163076137 [arcmin] (formal 1-sigma fit error)
SNR: 22.709455365888
Angular difference between Flight and Ground position is 1.181343 arcmin
Partial Coding Fraction: 0.3984375 [ including projection effects ]
Duration
T90: 5.0479998588562 +/- 0.648752741372382
Measured from: -2.10799992084503
to: 2.93999993801117 [s; relative to TRIGTIME]
T50: 1.50399994850159 +/- 0.392448801217247
Measured from: -0.0799999237060547
to: 1.42400002479553 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.0559999942779541
to: 0.944000005722046 [s; relative to TRIGTIME]
Total Fluence
Measured from: -2.6159999370575
to: 3.37999999523163 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.339263 0.496197 0.335499 0.036564
0.027514 0.029626 0.023916 0.017394 [error]
Peak 0.122288 0.209274 0.145468 0.025050
0.012772 0.014730 0.012250 0.007646 [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 1.21e-07 1.97e-07 2.43e-07 5.92e-07 7.30e-07 1.15e-06 erg/cm2
Error 1.32e-08 1.38e-08 2.28e-08 1.14e-07 5.51e-08 1.34e-07 erg/cm2
Peak flux Power-law 1.42e+00 1.35e+00 8.95e-01 9.21e-01 4.04e+00 4.59e+00 ph/cm2/s
Error 1.84e-01 1.17e-01 9.21e-02 1.80e-01 3.41e-01 3.81e-01 ph/cm2/s
Fluence Cutoff-PL 1.08e-07 2.15e-07 2.55e-07 2.21e-07 6.98e-07 7.99e-07 erg/cm2
Error 1.56e-08 1.77e-08 2.58e-08 1.32e-07 5.84e-08 1.42e-07 erg/cm2
Peak flux Cutoff-PL 1.12e+00 1.55e+00 1.03e+00 3.09e-01 3.93e+00 4.01e+00 ph/cm2/s
Error 2.21e-01 1.53e-01 1.17e-01 1.53e-01 3.47e-01 3.74e-01 ph/cm2/s
Fluence Band 1.07e-07 2.14e-07 2.55e-07 2.25e-07 6.99e-07 8.02e-07 erg/cm2
Error -------- 1.73e-08 2.37e-08 -------- 5.55e-08 -------- erg/cm2
Peak flux Band 1.15e+00 1.53e+00 1.02e+00 3.60e-01 3.96e+00 4.07e+00 ph/cm2/s
Error -------- -------- -------- -------- 3.59e-01 -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.699 0.115 - - 1.31e-02 9.48e-04 55.860 57
CPL 0.929 0.505 68.3 22.6 3.28e-02 2.09e-02 47.780 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.595 0.126 - - 3.15e-02 2.68e-03 63.520 57
CPL 0.233 0.670 65.7 12.2 1.54e-01 1.36e-01 47.290 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: 5.184000 sec.
T50 in the 50-300 keV band: 1.792000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 5.996 -2.616 3.380
T90 5.048 -2.108 2.940
T50 1.504 -0.080 1.424
Peak 1.000 -0.056 0.944
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
274.1396 +74.6943 0.0085 30.0 69.2 1.2608 22.7 TRIG_01277428
------------------------------------------
Foreground time interval of the image:
-2.616 3.380 (delta_t = 5.996 [sec])
Background time interval of the image:
-239.752 -2.616 (delta_t = 237.136 [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 -2.616 sec. to 3.380 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.69867 ( -0.113979 0.11584 )
Norm@50keV : 1.31473E-02 ( -0.000950409 0.000944974 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.86 using 59 PHA bins.
# Reduced chi-squared = 0.9800 for 57 degrees of freedom
# Null hypothesis probability = 5.179617e-01
Photon flux (15-150 keV) in 5.996 sec: 1.74530 ( -0.122739 0.122893 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.29959e-07 ( -5.49386e-08 5.52124e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.616 sec. to 3.380 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.928936 ( -0.532837 0.476878 )
Epeak [keV] : 68.2569 ( -11.6996 33.4418 )
Norm@50keV : 3.27563E-02 ( -0.0138832 0.027953 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.78 using 59 PHA bins.
# Reduced chi-squared = 0.8533 for 56 degrees of freedom
# Null hypothesis probability = 7.746115e-01
Photon flux (15-150 keV) in 5.996 sec: 1.69534 ( -0.12655 0.12658 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.9839e-07 ( -5.81672e-08 5.85929e-08 ) ergs/cm2
Band function
Time interval is from -2.616 sec. to 3.380 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.929199 ( -0.449474 0.545646 )
beta : -10.0000 ( 10 1.77636e-15 )
Epeak [keV] : 68.2539 ( -11.7013 33.3041 )
Norm@50keV : 3.27436E-02 ( -0.0138679 0.0279839 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.78 using 59 PHA bins.
# Reduced chi-squared = 0.8688 for 55 degrees of freedom
# Null hypothesis probability = 7.441950e-01
Photon flux (15-150 keV) in 5.996 sec: 1.70204 ( 5.29796 -0.13194 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.98864e-07 ( -6.98822e-07 -5.90846e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.7065 (-1.07557 1.16918)
R^2/D10^2 : 0.268826 (-0.0699359 0.0939123)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 85.52 using 59 PHA bins.
# Reduced chi-squared = 1.500 for 57 degrees of freedom
# Null hypothesis probability = 8.588702e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.408e-08 8.676e-09
25- 50 2.333e-07 1.919e-08
50-150 2.854e-07 4.158e-08
15-150 5.828e-07 4.890e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 134.635 (-33.575 47.279)
Norm : 7.28242 (-0.594519 0.729269)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.131e-07 1.091e-08
25- 50 2.061e-07 2.219e-08
50-150 3.884e-07 1.328e-07
15-150 7.076e-07 1.587e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.03606 (-1.44638 1.72145)
R1^2/D10^2 : 2.89227 (-1.6377 5.31722)
kT2 [keV] : 19.9983 (-2.9392 4.63504)
R2^2/D10^2 : 5.34578E-02 (-0.0309958 0.0497977)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.094e-07 4.142e-08
25- 50 2.086e-07 4.722e-08
50-150 3.730e-07 1.074e-07
15-150 6.910e-07 1.886e-07
Peak spectrum fit
Power-law model
Time interval is from -0.056 sec. to 0.944 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.59516 ( -0.12505 0.127357 )
Norm@50keV : 3.15245E-02 ( -0.00268839 0.00267801 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.52 using 59 PHA bins.
# Reduced chi-squared = 1.114 for 57 degrees of freedom
# Null hypothesis probability = 2.576229e-01
Photon flux (15-150 keV) in 1 sec: 4.04499 ( -0.341158 0.341471 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.94998e-07 ( -2.65478e-08 2.6651e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.056 sec. to 0.944 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.232562 ( -0.720353 0.619587 )
Epeak [keV] : 65.6594 ( -8.59534 15.7125 )
Norm@50keV : 0.153985 ( -0.0777631 0.193792 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.29 using 59 PHA bins.
# Reduced chi-squared = 0.8445 for 56 degrees of freedom
# Null hypothesis probability = 7.899202e-01
Photon flux (15-150 keV) in 1 sec: 3.93233 ( -0.34675 0.34666 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.8242e-07 ( -2.7333e-08 2.755e-08 ) ergs/cm2
Band function
Time interval is from -0.056 sec. to 0.944 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.232421 ( -0.42699 1.34061 )
beta : -10.0000 ( 10 1.77636e-15 )
Epeak [keV] : 65.6459 ( -8.60234 15.7147 )
Norm@50keV : 0.154024 ( -0.0778386 0.194491 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.29 using 59 PHA bins.
# Reduced chi-squared = 0.8598 for 55 degrees of freedom
# Null hypothesis probability = 7.605855e-01
Photon flux (15-150 keV) in 1 sec: 3.96444 ( 3.03556 -0.39033 ) 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] : 14.6590 (-1.18639 1.29563)
R^2/D10^2 : 0.536504 (-0.142857 0.190803)
(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 2.422e-08 3.515e-09
25- 50 9.420e-08 9.335e-09
50-150 1.363e-07 2.095e-08
15-150 2.547e-07 2.575e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 165.151 (-45.3147 -162.422)
Norm : 17.0347 (-1.53493 1.64399)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.336e-08 4.805e-09
25- 50 8.146e-08 1.462e-08
50-150 1.671e-07 6.519e-08
15-150 2.919e-07 8.780e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.03145 (-2.45281 5.67619)
R1^2/D10^2 : 8.41452 (-7.34079 195.927)
kT2 [keV] : 17.3181 (-2.28678 9.63953)
R2^2/D10^2 : 0.260488 (-0.229405 0.20571)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.681e-08 1.571e-08
25- 50 8.498e-08 2.283e-08
50-150 1.536e-07 4.183e-08
15-150 2.754e-07 6.670e-08
Plot creation:
Sun Dec 29 22:27:56 EST 2024