batgrbproduct analysis for trigger=1270999
batgrbproduct Analysis for Trigger=1270999
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 Nov 29 19:58:31 EST 2024
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1270999/batgroup_hand_proc
======================================================================
Trigger: 01270999 Segment: 000
BAT Trigger Time: 754503308.864 [s; MET]
Trigger Stop: 754503312.96 [s; MET]
UTC: 2024-11-28T16:14:34.246600 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 273.723811228867 Dec: 33.4353166788259 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.43
Image Trigger?: NO
Rate S/N Ratio: 10.0995049383621 [ if not an image trigger ]
Image S/N Ratio: 8.43
Flight Position: [ source = BAT ]
RA: 273.723811228867 Dec: 33.4353166788259 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 273.723671987509 Dec: 33.49245867359 [deg; J2000]
{ 18h 14m 53.7s , +33d 29' 32.9" }
+/- 2.41340729667065 [arcmin] (estimated 90% radius based on SNR)
+/- 1.03029909677036 [arcmin] (formal 1-sigma fit error)
SNR: 8.63979039625564
Angular difference between Flight and Ground position is 3.428527 arcmin
Partial Coding Fraction: 0.5234375 [ including projection effects ]
Duration
T90: 238.324000000954 +/- 15.8339732041905
Measured from: 0.0279999971389771
to: 238.351999998093 [s; relative to TRIGTIME]
T50: 216.46799993515 +/- 209.349574487091
Measured from: 3.15200006961823
to: 219.620000004768 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2.8840000629425
to: 3.8840000629425 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.860000014305115
to: 244.080000042915 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.459178 0.835955 0.418665 0.046443
0.111807 0.118899 0.109914 0.092298 [error]
Peak 0.045698 0.046710 0.034252 0.008193
0.009526 0.010259 0.009237 0.007447 [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 1.55e-07 2.77e-07 3.81e-07 1.09e-06 1.10e-06 1.90e-06 erg/cm2
Error 4.46e-08 5.34e-08 1.01e-07 5.92e-07 2.46e-07 6.86e-07 erg/cm2
Peak flux Power-law 3.53e-01 3.45e-01 2.35e-01 2.52e-01 1.03e+00 1.18e+00 ph/cm2/s
Error 1.28e-01 8.13e-02 7.40e-02 1.59e-01 2.38e-01 2.83e-01 ph/cm2/s
Fluence Cutoff-PL 1.20e-07 3.53e-07 3.53e-07 7.52e-08 8.92e-07 9.01e-07 erg/cm2
Error 5.64e-08 8.51e-08 1.40e-07 3.08e-07 2.59e-07 4.07e-07 erg/cm2
Peak flux Cutoff-PL 3.30e-01 3.70e-01 2.39e-01 1.19e-01 1.01e+00 1.06e+00 ph/cm2/s
Error 1.45e-01 1.07e-01 8.41e-02 1.56e-01 2.45e-01 3.99e-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 1.541 0.315 - - 4.76e-04 9.74e-05 62.490 57
CPL -0.758 2.663 52.0 32.0 8.97e-03 3.06e-01 58.250 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.551 0.401 - - 8.16e-03 2.02e-03 71.990 57
CPL 0.973 1.591 79.5 -20.5 1.71e-02 1.41e-01 71.630 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: 8.704000 sec.
T50 in the 50-300 keV band: 4.480000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 244.940 -0.860 244.080
T90 238.324 0.028 238.352
T50 216.468 3.152 219.620
Peak 1.000 2.884 3.884
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
273.7237 +33.4925 0.0223 27.3 -77.8 0.9818 8.6 TRIG_01270999
------------------------------------------
Foreground time interval of the image:
-0.860 37.837 (delta_t = 38.697 [sec])
Background time interval of the image:
-239.864 -0.860 (delta_t = 239.004 [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 -0.860 sec. to 244.080 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.54116 ( -0.309491 0.320224 )
Norm@50keV : 4.76464E-04 ( -9.82292e-05 9.66588e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.49 using 59 PHA bins.
# Reduced chi-squared = 1.096 for 57 degrees of freedom
# Null hypothesis probability = 2.874609e-01
Photon flux (15-150 keV) in 244.9 sec: 6.01643E-02 ( -0.0114915 0.0114974 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.09985e-06 ( -2.42617e-07 2.50158e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.860 sec. to 244.080 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.757559 ( -3.35729 1.96832 )
Epeak [keV] : 52.0104 ( -10.5287 53.567 )
Norm@50keV : 8.96861E-03 ( -0.00928149 0.603441 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.25 using 59 PHA bins.
# Reduced chi-squared = 1.040 for 56 degrees of freedom
# Null hypothesis probability = 3.925186e-01
Photon flux (15-150 keV) in 244.9 sec: 5.53495E-02 ( -0.0121319 0.0122247 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.9174e-07 ( -2.28058e-07 2.90711e-07 ) ergs/cm2
Band function
Time interval is from -0.860 sec. to 244.080 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.32881 ( -2.67669 -2.51718 )
beta : -2.81320 ( 2.88826 1.24909 )
Epeak [keV] : 48.2246 ( -16.2212 38.9514 )
Norm@50keV : 1.99299E-02 ( -0.0198724 1.78506 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.56 using 59 PHA bins.
# Reduced chi-squared = 1.047 for 55 degrees of freedom
# Null hypothesis probability = 3.805997e-01
Photon flux (15-150 keV) in 244.9 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] : 12.7140 (-2.17171 2.74976)
R^2/D10^2 : 1.29411E-02 (-0.0065901 0.0123502)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.44 using 59 PHA bins.
# Reduced chi-squared = 1.025 for 57 degrees of freedom
# Null hypothesis probability = 4.222368e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.087e-07 4.277e-08
25- 50 3.652e-07 1.170e-07
50-150 3.683e-07 1.647e-07
15-150 8.422e-07 2.849e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 161.539 (-90.7607 -165.16)
Norm : 0.249853 (-0.0489147 0.0610547)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.561e-07 9.000e-08
25- 50 2.924e-07 1.633e-07
50-150 5.945e-07 3.464e-07
15-150 1.043e-06 5.985e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 200.000 (-200 -200)
R1^2/D10^2 : 3.87224E-06 (-3.87189e-06 -3.87189e-06)
kT2 [keV] : 11.5744 (-2.09419 2.91671)
R2^2/D10^2 : 1.67859E-02 (-0.00902281 0.012102)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.210e-07 6.649e-08
25- 50 3.530e-07 2.090e-07
50-150 3.877e-07 2.469e-07
15-150 8.618e-07 4.871e-07
Peak spectrum fit
Power-law model
Time interval is from 2.884 sec. to 3.884 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.55143 ( -0.393566 0.407996 )
Norm@50keV : 8.16278E-03 ( -0.00204828 0.00199809 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.99 using 59 PHA bins.
# Reduced chi-squared = 1.263 for 57 degrees of freedom
# Null hypothesis probability = 8.716586e-02
Photon flux (15-150 keV) in 1 sec: 1.03379 ( -0.238418 0.238569 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.68299e-08 ( -2.04948e-08 2.12251e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.884 sec. to 3.884 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.972554 ( -2.22835 0.953739 )
Epeak [keV] : 79.5162 ( -38.5522 -79.5677 )
Norm@50keV : 1.70931E-02 ( -0.0108094 0.271499 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.63 using 59 PHA bins.
# Reduced chi-squared = 1.279 for 56 degrees of freedom
# Null hypothesis probability = 7.779499e-02
Photon flux (15-150 keV) in 1 sec: 1.01260 ( -0.246648 0.24427 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.22175e-08 ( -2.30262e-08 2.4327e-08 ) ergs/cm2
Band function
Time interval is from 2.884 sec. to 3.884 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.94368 ( -4.94368 -4.94368 )
beta : -1.75685 ( -0.592464 0.47208 )
Epeak [keV] : 25.2846 ( -25.2846 7.82092 )
Norm@50keV : 829.365 ( -186.856 4.974e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.00 using 59 PHA bins.
# Reduced chi-squared = 1.273 for 55 degrees of freedom
# Null hypothesis probability = 8.383753e-02
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 7.27288e-08 ( 0 0 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.0771 (-3.32155 4.49381)
R^2/D10^2 : 0.190985 (-0.124396 0.349569)
(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 6.926e-09 3.877e-09
25- 50 2.401e-08 1.049e-08
50-150 2.605e-08 1.496e-08
15-150 5.698e-08 2.553e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 186.236 (-118.807 -184.29)
Norm : 4.23824 (-0.98189 1.3309)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.065e-08 6.245e-09
25- 50 2.031e-08 1.175e-08
50-150 4.353e-08 2.548e-08
15-150 7.448e-08 4.365e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.55473 (-2.77372 7.74253)
R1^2/D10^2 : 2.29660 (-2.09742 29.5933)
kT2 [keV] : 19.6307 (-7.37805 -19.6427)
R2^2/D10^2 : 3.60166E-02 (-0.0355083 0.184679)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.105e-08 6.235e-09
25- 50 2.027e-08 1.022e-08
50-150 3.823e-08 2.252e-08
15-150 6.956e-08 3.841e-08
Plot creation:
Fri Nov 29 20:17:42 EST 2024