batgrbproduct analysis for trigger=1246989
batgrbproduct Analysis for Trigger=1246989
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): Tue Aug 6 19:23:28 EDT 2024
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1246989/GCN5_download_cron
======================================================================
Trigger: 01246989 Segment: 000
BAT Trigger Time: 744560968.064 [s; MET]
Trigger Stop: 744560969.088 [s; MET]
UTC: 2024-08-05T14:28:54.126720 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 254.239139683668 Dec: 18.3233256365182 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.47
Image Trigger?: NO
Rate S/N Ratio: 10.9087121146357 [ if not an image trigger ]
Image S/N Ratio: 7.47
Flight Position: [ source = BAT ]
RA: 254.239139683668 Dec: 18.3233256365182 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 254.214720111381 Dec: 18.3138524951306 [deg; J2000]
{ 16h 56m 51.5s , +18d 18' 49.9" }
+/- 1.35646489152634 [arcmin] (estimated 90% radius based on SNR)
+/- 0.478928524645433 [arcmin] (formal 1-sigma fit error)
SNR: 19.677199897567
Angular difference between Flight and Ground position is 1.502577 arcmin
Partial Coding Fraction: 0.859375 [ including projection effects ]
Duration
T90: 64.9879999160767 +/- 2.56272667544376
Measured from: 3.0200001001358
to: 68.0080000162125 [s; relative to TRIGTIME]
T50: 30.2639999389648 +/- 1.04240493807176
Measured from: 17.9080001115799
to: 48.1720000505447 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 15.9479999542236
to: 16.9479999542236 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.75600004196167
to: 96.6759999990463 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.483883 3.235100 2.018544 0.346990
0.071194 0.070120 0.061001 0.054908 [error]
Peak 0.065408 0.117416 0.096495 0.018098
0.008157 0.008655 0.007878 0.006314 [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 8.11e-07 1.31e-06 1.60e-06 3.84e-06 4.81e-06 7.56e-06 erg/cm2
Error 4.36e-08 4.08e-08 6.38e-08 3.39e-07 1.50e-07 3.81e-07 erg/cm2
Peak flux Power-law 6.84e-01 7.71e-01 6.21e-01 8.34e-01 2.38e+00 2.91e+00 ph/cm2/s
Error 9.91e-02 7.04e-02 6.27e-02 1.70e-01 2.01e-01 2.55e-01 ph/cm2/s
Fluence Cutoff-PL 7.14e-07 1.37e-06 1.63e-06 1.63e-06 4.54e-06 5.35e-06 erg/cm2
Error 5.49e-08 4.80e-08 6.96e-08 4.94e-07 1.80e-07 5.26e-07 erg/cm2
Peak flux Cutoff-PL 5.78e-01 8.39e-01 6.70e-01 3.33e-01 2.30e+00 2.42e+00 ph/cm2/s
Error 1.18e-01 8.65e-02 7.43e-02 1.94e-01 2.08e-01 2.78e-01 ph/cm2/s
Fluence Band 6.86e-07 1.39e-06 1.59e-06 2.66e-06 4.56e-06 6.33e-06 erg/cm2
Error 6.18e-08 5.58e-08 7.98e-08 -------- 1.76e-07 -------- erg/cm2
Peak flux Band 5.70e-01 8.49e-01 6.58e-01 4.71e-01 2.30e+00 2.55e+00 ph/cm2/s
Error -------- 1.23e-01 9.93e-02 -------- 2.07e-01 -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.712 0.056 - - 5.34e-03 1.60e-04 59.870 57
CPL 1.069 0.258 72.1 12.0 1.11e-02 3.27e-03 38.840 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.311 0.137 - - 1.99e-02 1.68e-03 82.210 57
CPL 0.382 0.637 88.0 41.7 5.82e-02 4.78e-02 74.400 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: 59.200000 sec.
T50 in the 50-300 keV band: 29.376000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 97.432 -0.756 96.676
T90 64.988 3.020 68.008
T50 30.264 17.908 48.172
Peak 1.000 15.948 16.948
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
254.2147 +18.3139 0.0098 19.8 30.8 0.9171 19.7 TRIG_01246989
------------------------------------------
Foreground time interval of the image:
-0.756 8.837 (delta_t = 9.593 [sec])
Background time interval of the image:
-239.064 -0.756 (delta_t = 238.308 [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 -0.756 sec. to 96.676 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.71171 ( -0.0558375 0.05609 )
Norm@50keV : 5.34024E-03 ( -0.000160119 0.000159865 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.87 using 59 PHA bins.
# Reduced chi-squared = 1.050 for 57 degrees of freedom
# Null hypothesis probability = 3.719597e-01
Photon flux (15-150 keV) in 97.43 sec: 0.712168 ( -0.0224652 0.0225359 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.81305e-06 ( -1.50096e-07 1.50506e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.756 sec. to 96.676 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.06878 ( -0.265577 0.249955 )
Epeak [keV] : 72.0622 ( -8.3069 15.6139 )
Norm@50keV : 1.11034E-02 ( -0.00269627 0.00384562 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.84 using 59 PHA bins.
# Reduced chi-squared = 0.6935 for 56 degrees of freedom
# Null hypothesis probability = 9.608231e-01
Photon flux (15-150 keV) in 97.43 sec: 0.678540 ( -0.02538 0.025523 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.54395e-06 ( -1.80187e-07 1.80557e-07 ) ergs/cm2
Band function
Time interval is from -0.756 sec. to 96.676 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.772595 ( -0.440076 0.747908 )
beta : -2.08291 ( 2.08278 0.198229 )
Epeak [keV] : 59.1155 ( -14.1788 20.9443 )
Norm@50keV : 1.65777E-02 ( -0.00723307 0.0324079 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.16 using 59 PHA bins.
# Reduced chi-squared = 0.6756 for 55 degrees of freedom
# Null hypothesis probability = 9.689118e-01
Photon flux (15-150 keV) in 97.43 sec: 0.673988 ( 6.32601 -0.026014 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.56294e-06 ( -4.56226e-06 -1.76641e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.6828 ( )
R^2/D10^2 : 0.103350 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 195.93 using 59 PHA bins.
# Reduced chi-squared = 3.4373 for 57 degrees of freedom
# Null hypothesis probability = 3.900843e-17
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.990e-07 2.411e-08
25- 50 1.450e-06 5.164e-08
50-150 1.766e-06 1.106e-07
15-150 3.615e-06 1.125e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 128.893 (-15.4424 21.3951)
Norm : 2.96864 (-0.123019 0.123626)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.508e-07 4.599e-08
25- 50 1.359e-06 6.674e-08
50-150 2.511e-06 5.641e-07
15-150 4.621e-06 6.065e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.69830 (-1.03349 1.05491)
R1^2/D10^2 : 0.530504 (-0.167276 0.305287)
kT2 [keV] : 23.8363 (-3.20062 4.82762)
R2^2/D10^2 : 9.72043E-03 (-0.00495819 0.00784115)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.333e-07 6.484e-08
25- 50 1.409e-06 1.130e-07
50-150 2.448e-06 3.420e-07
15-150 4.491e-06 4.779e-07
Peak spectrum fit
Power-law model
Time interval is from 15.948 sec. to 16.948 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.31069 ( -0.136751 0.136691 )
Norm@50keV : 1.99259E-02 ( -0.00167722 0.00167498 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 82.21 using 59 PHA bins.
# Reduced chi-squared = 1.442 for 57 degrees of freedom
# Null hypothesis probability = 1.607731e-02
Photon flux (15-150 keV) in 1 sec: 2.38196 ( -0.201305 0.201466 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.96393e-07 ( -1.84338e-08 1.85858e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 15.948 sec. to 16.948 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.381961 ( -0.685158 0.589439 )
Epeak [keV] : 87.9731 ( -18.9998 64.3688 )
Norm@50keV : 5.82370E-02 ( -0.0282307 0.0673327 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.40 using 59 PHA bins.
# Reduced chi-squared = 1.329 for 56 degrees of freedom
# Null hypothesis probability = 5.052313e-02
Photon flux (15-150 keV) in 1 sec: 2.30341 ( -0.20775 0.20763 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.83861e-07 ( -2.0231e-08 2.0373e-08 ) ergs/cm2
Band function
Time interval is from 15.948 sec. to 16.948 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.880712 ( -1.79852 -0.895078 )
beta : -1.63567 ( 1.63504 0.265246 )
Epeak [keV] : 48.7904 ( -17.5193 82.9026 )
Norm@50keV : 0.409851 ( -0.444568 194.461 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.82 using 59 PHA bins.
# Reduced chi-squared = 1.342 for 55 degrees of freedom
# Null hypothesis probability = 4.604114e-02
Photon flux (15-150 keV) in 1 sec: 2.30180 ( 4.6982 -0.20729 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.84316e-07 ( 0 0 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 16.3719 (-1.59551 1.80085)
R^2/D10^2 : 0.214133 (-0.0640549 0.0896521)
(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 1.180e-08 1.907e-09
25- 50 5.065e-08 6.255e-09
50-150 9.569e-08 1.464e-08
15-150 1.581e-07 1.790e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-28.0593 -200)
Norm : 9.83781 (-0.823884 0.823884)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.449e-08 2.605e-09
25- 50 4.712e-08 1.073e-08
50-150 1.033e-07 4.077e-08
15-150 1.750e-07 6.147e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.13677 (-2.51959 3.5095)
R1^2/D10^2 : 1.15680 (-0.688965 2.31704)
kT2 [keV] : 25.0150 (-5.56229 18.6038)
R2^2/D10^2 : 3.87298E-02 (-0.0335282 0.0647435)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.823e-08 9.284e-09
25- 50 4.915e-08 1.936e-08
50-150 1.178e-07 5.996e-08
15-150 1.852e-07 8.979e-08
Plot creation:
Tue Aug 6 19:26:56 EDT 2024