batgrbproduct analysis for trigger=1250617
batgrbproduct Analysis for Trigger=1250617
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 Aug 29 14:30:22 EDT 2024
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1250617/batgroup_hand_proc
======================================================================
Trigger: 01250617 Segment: 000
BAT Trigger Time: 746294013.888 [s; MET]
Trigger Stop: 746294014.4 [s; MET]
UTC: 2024-08-25T15:52:59.832120 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 344.551212104986 Dec: 1.03600080556074 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.64
Image Trigger?: NO
Rate S/N Ratio: 17 [ if not an image trigger ]
Image S/N Ratio: 9.64
Flight Position: [ source = BAT ]
RA: 344.551212104986 Dec: 1.03600080556074 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 344.570301755061 Dec: 1.01915070402589 [deg; J2000]
{ 22h 58m 16.9s , +01d 01' 08.9" }
+/- 0.54833825377189 [arcmin] (estimated 90% radius based on SNR)
+/- 0.213541589534078 [arcmin] (formal 1-sigma fit error)
SNR: 71.7639232934279
Angular difference between Flight and Ground position is 1.527614 arcmin
Partial Coding Fraction: 0.5390625 [ including projection effects ]
Duration
T90: 57.2039999961853 +/- 8.5680233015862
Measured from: 1.4559999704361
to: 58.6599999666214 [s; relative to TRIGTIME]
T50: 2.73199999332428 +/- 0.0863481474235937
Measured from: 1.91199994087219
to: 4.64399993419647 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.43599998950958
to: 2.43599998950958 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0440000295639038
to: 216.763999938965 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 7.877731 12.445568 11.627110 3.956914
0.108561 0.120987 0.113403 0.090047 [error]
Peak 1.995782 4.194437 4.927005 1.816023
0.033421 0.047591 0.054164 0.040799 [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 2.34e-06 5.17e-06 8.99e-06 3.64e-05 2.46e-05 5.29e-05 erg/cm2
Error 8.40e-08 1.08e-07 1.39e-07 1.39e-06 3.64e-07 1.41e-06 erg/cm2
Peak flux Power-law 2.00e+01 2.91e+01 3.16e+01 6.42e+01 1.00e+02 1.45e+02 ph/cm2/s
Error 7.38e-01 6.53e-01 5.08e-01 2.29e+00 1.69e+00 2.49e+00 ph/cm2/s
Fluence Cutoff-PL 2.34e-06 5.17e-06 9.00e-06 3.61e-05 2.46e-05 5.26e-05 erg/cm2
Error 7.14e-08 1.08e-07 1.39e-07 1.44e-06 3.64e-07 1.45e-06 erg/cm2
Peak flux Cutoff-PL 1.82e+01 2.92e+01 3.27e+01 5.11e+01 9.93e+01 1.31e+02 ph/cm2/s
Error 1.02e+00 6.71e-01 7.06e-01 5.11e+00 1.76e+00 5.48e+00 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 9.44e-01 1.06e+00 6.76e-01 3.05e-01 2.88e+00 2.99e+00 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 1.201 0.029 - - 1.12e-02 1.76e-04 34.520 57
CPL 1.196 0.043 9997.6 0.0 1.12e-02 3.87e-04 34.690 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.882 0.029 - - 8.75e-01 1.47e-02 55.050 57
CPL 0.612 0.122 329.3 142.4 1.12e+00 1.22e-01 40.040 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: 9.024000 sec.
T50 in the 50-300 keV band: 1.664000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 216.808 -0.044 216.764
T90 57.204 1.456 58.660
T50 2.732 1.912 4.644
Peak 1.000 1.436 2.436
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
344.5703 +1.0192 0.0027 24.7 101.9 32.0666 71.8 TRIG_01250617
------------------------------------------
Foreground time interval of the image:
-0.044 10.413 (delta_t = 10.457 [sec])
Background time interval of the image:
-50.987 -0.044 (delta_t = 50.943 [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 -0.044 sec. to 216.764 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.20064 ( -0.028949 0.0288374 )
Norm@50keV : 1.11852E-02 ( -0.000176408 0.000175846 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 34.52 using 59 PHA bins.
# Reduced chi-squared = 0.6056 for 57 degrees of freedom
# Null hypothesis probability = 9.919503e-01
Photon flux (15-150 keV) in 216.8 sec: 1.31304 ( -0.0231567 0.0232655 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.45977e-05 ( -3.63561e-07 3.63634e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.044 sec. to 216.764 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.19559 ( -0.0573697 0.0290182 )
Epeak [keV] : 9997.59 ( -9998.11 -9998.11 )
Norm@50keV : 1.12381E-02 ( -0.000164824 0.000608243 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 34.69 using 59 PHA bins.
# Reduced chi-squared = 0.6195 for 56 degrees of freedom
# Null hypothesis probability = 9.887388e-01
Photon flux (15-150 keV) in 216.8 sec: 1.31226 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.46035e-05 ( -3.62706e-07 3.65091e-07 ) ergs/cm2
Band function
Time interval is from -0.044 sec. to 216.764 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.500485 ( 0.782734 5.31979 )
beta : -1.20463 ( 1.20414 0.0304937 )
Epeak [keV] : 55.7603 ( -55.7061 234.675 )
Norm@50keV : 3.57288E-02 ( -0.0359009 627689 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 34.04 using 59 PHA bins.
# Reduced chi-squared = 0.6190 for 55 degrees of freedom
# Null hypothesis probability = 9.881951e-01
Photon flux (15-150 keV) in 216.8 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] : 22.8310 ( )
R^2/D10^2 : 3.79969E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 933.48 using 59 PHA bins.
# Reduced chi-squared = 16.377 for 57 degrees of freedom
# Null hypothesis probability = 9.210497e-159
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.810e-07 2.699e-08
25- 50 4.219e-06 1.019e-07
50-150 1.643e-05 3.740e-07
15-150 2.143e-05 3.718e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 5.82969 ( )
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.147e-06 5.203e-08
25- 50 6.054e-06 1.051e-07
50-150 1.328e-05 2.374e-07
15-150 2.248e-05 3.794e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.94521 (-0.54898 0.577472)
R1^2/D10^2 : 0.510455 (-0.0935469 0.119923)
kT2 [keV] : 38.4726 (-2.41509 2.9463)
R2^2/D10^2 : 6.10040E-03 (-0.00124561 0.00140033)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.978e-06 1.139e-07
25- 50 5.369e-06 1.593e-07
50-150 1.729e-05 4.780e-07
15-150 2.464e-05 5.854e-07
Peak spectrum fit
Power-law model
Time interval is from 1.436 sec. to 2.436 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.881618 ( -0.0288034 0.0286749 )
Norm@50keV : 0.875305 ( -0.0147471 0.0147168 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.05 using 59 PHA bins.
# Reduced chi-squared = 0.9658 for 57 degrees of freedom
# Null hypothesis probability = 5.484736e-01
Photon flux (15-150 keV) in 1 sec: 100.457 ( -1.69017 1.69181 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.89422e-06 ( -1.62441e-07 1.62484e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.436 sec. to 2.436 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.611867 ( -0.123286 0.120177 )
Epeak [keV] : 329.346 ( -82.1304 202.737 )
Norm@50keV : 1.11937 ( -0.113788 0.129426 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.04 using 59 PHA bins.
# Reduced chi-squared = 0.7151 for 56 degrees of freedom
# Null hypothesis probability = 9.469672e-01
Photon flux (15-150 keV) in 1 sec: 99.2515 ( -1.7561 1.7595 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.84736e-06 ( 0 0 ) ergs/cm2
Band function
Time interval is from 1.436 sec. to 2.436 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99994 ( -0.000398389 -4.99994 )
beta : -0.907064 ( -0.0304009 0.0303981 )
Epeak [keV] : 29.8647 ( -4.122 2.97385 )
Norm@50keV : 1.86398E+04 ( -291.055 25369.2 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.80 using 59 PHA bins.
# Reduced chi-squared = 0.8327 for 55 degrees of freedom
# Null hypothesis probability = 8.070948e-01
Photon flux (15-150 keV) in 1 sec: 2.87971 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.0244e-07 ( 0 0 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 25.7800 ( )
R^2/D10^2 : 2.30434 ( )
(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 2.617e-07 8.200e-09
25- 50 1.508e-06 3.850e-08
50-150 7.393e-06 1.655e-07
15-150 9.162e-06 1.765e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 419.846 ( )
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.045e-06 1.750e-08
25- 50 2.011e-06 3.650e-08
50-150 4.411e-06 8.150e-08
15-150 7.467e-06 1.340e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 10.6029 (-0.92395 0.997824)
R1^2/D10^2 : 17.2925 (-3.55561 4.83863)
kT2 [keV] : 42.2675 (-3.44536 4.68909)
R2^2/D10^2 : 0.443230 (-0.119473 0.133457)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.010e-07 3.405e-08
25- 50 1.766e-06 6.400e-08
50-150 7.615e-06 3.550e-07
15-150 9.882e-06 3.555e-07
Plot creation:
Fri Aug 30 17:23:57 EDT 2024