batgrbproduct analysis for trigger=1258721
batgrbproduct Analysis for Trigger=1258721
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): Mon Oct 7 19:50:25 EDT 2024
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1258721/GCN5_download_cron
======================================================================
Trigger: 01258721 Segment: 000
BAT Trigger Time: 749944352.576 [s; MET]
Trigger Stop: 749944368.96 [s; MET]
UTC: 2024-10-06T21:51:58.270480 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 304.794264846893 Dec: -40.7959833433653 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.04
Image Trigger?: NO
Rate S/N Ratio: 13.4164078649987 [ if not an image trigger ]
Image S/N Ratio: 11.04
Flight Position: [ source = BAT ]
RA: 304.794264846893 Dec: -40.7959833433653 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 304.781780512405 Dec: -40.8060197366704 [deg; J2000]
{ 20h 19m 07.6s , -40d 48' 21.7" }
+/- 1.80247208407316 [arcmin] (estimated 90% radius based on SNR)
+/- 0.72644388795384 [arcmin] (formal 1-sigma fit error)
SNR: 13.1096737499109
Angular difference between Flight and Ground position is 0.827130 arcmin
Partial Coding Fraction: 0.65625 [ including projection effects ]
Duration
T90: 47.9520000219345 +/- 9.72215615943751
Measured from: -3.9119998216629
to: 44.0400002002716 [s; relative to TRIGTIME]
T50: 17.6800000667572 +/- 8.02622905394277
Measured from: 4.34400010108948
to: 22.0240001678467 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 9.94800007343292
to: 10.9480000734329 [s; relative to TRIGTIME]
Total Fluence
Measured from: -7.14399993419647
to: 47.8159999847412 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.440857 0.579261 0.485710 0.088790
0.063508 0.064467 0.055794 0.047223 [error]
Peak 0.027475 0.029815 0.018216 0.007178
0.008387 0.008784 0.007508 0.006429 [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 1.41e-07 2.56e-07 3.56e-07 1.03e-06 1.02e-06 1.79e-06 erg/cm2
Error 2.61e-08 2.99e-08 5.48e-08 3.33e-07 1.33e-07 3.79e-07 erg/cm2
Peak flux Power-law 1.94e-01 2.09e-01 1.60e-01 2.00e-01 6.38e-01 7.62e-01 ph/cm2/s
Error 1.04e-01 7.17e-02 6.11e-02 1.59e-01 2.04e-01 2.47e-01 ph/cm2/s
Fluence Cutoff-PL 1.27e-07 2.78e-07 3.66e-07 3.57e-07 9.60e-07 1.13e-06 erg/cm2
Error 3.03e-08 3.88e-08 6.14e-08 4.62e-07 1.47e-07 4.87e-07 erg/cm2
Peak flux Cutoff-PL 1.74e-01 2.26e-01 1.68e-01 8.89e-02 6.23e-01 6.57e-01 ph/cm2/s
Error 1.16e-01 9.12e-02 5.44e-02 1.25e-01 2.07e-01 2.83e-01 ph/cm2/s
Fluence Band 1.26e-07 2.77e-07 3.65e-07 4.33e-07 9.58e-07 1.20e-06 erg/cm2
Error 3.04e-08 -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 1.64e-01 2.39e-01 1.61e-01 1.28e-01 6.21e-01 6.92e-01 ph/cm2/s
Error -------- -------- -------- -------- 2.18e-01 -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.524 0.194 - - 1.97e-03 2.33e-04 65.800 57
CPL 0.768 0.863 78.0 2970.6 4.90e-03 6.52e-03 63.060 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.387 0.538 - - 5.25e-03 1.67e-03 51.740 57
CPL 0.666 2.628 89.2 0.0 1.25e-02 5.23e-01 51.370 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: 17.920000 sec.
T50 in the 50-300 keV band: 8.960000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 54.960 -7.144 47.816
T90 47.952 -3.912 44.040
T50 17.680 4.344 22.024
Peak 1.000 9.948 10.948
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
304.7818 -40.8060 0.0147 24.6 49.5 1.6903 13.1 TRIG_01258721
------------------------------------------
Foreground time interval of the image:
-7.144 47.816 (delta_t = 54.960 [sec])
Background time interval of the image:
-239.576 -7.144 (delta_t = 232.432 [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 -7.144 sec. to 47.816 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.52402 ( -0.192385 0.194931 )
Norm@50keV : 1.96837E-03 ( -0.000234118 0.000232295 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.80 using 59 PHA bins.
# Reduced chi-squared = 1.154 for 57 degrees of freedom
# Null hypothesis probability = 1.985799e-01
Photon flux (15-150 keV) in 54.96 sec: 0.247351 ( -0.0284407 0.0284728 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.02236e-06 ( -1.31959e-07 1.33752e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -7.144 sec. to 47.816 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.768133 ( -0.948478 0.778052 )
Epeak [keV] : 77.9525 ( -21.9087 5919.32 )
Norm@50keV : 4.89657E-03 ( -0.00292365 0.010125 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.06 using 59 PHA bins.
# Reduced chi-squared = 1.126 for 56 degrees of freedom
# Null hypothesis probability = 2.410035e-01
Photon flux (15-150 keV) in 54.96 sec: 0.239924 ( -0.02952 0.029496 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.60014e-07 ( -1.44886e-07 1.48628e-07 ) ergs/cm2
Band function
Time interval is from -7.144 sec. to 47.816 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.771922 ( -0.640594 0.561423 )
beta : -9.37152 ( 9.37167 19.3717 )
Epeak [keV] : 78.1728 ( -19.4853 6864.15 )
Norm@50keV : 4.87143E-03 ( -0.00298192 0.00189869 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.06 using 59 PHA bins.
# Reduced chi-squared = 1.146 for 55 degrees of freedom
# Null hypothesis probability = 2.128864e-01
Photon flux (15-150 keV) in 54.96 sec: 0.243281 ( 6.75672 -0.029889 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.5836e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.2216 (-1.85904 2.18554)
R^2/D10^2 : 3.41761E-02 (-0.013623 0.0220889)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.65 using 59 PHA bins.
# Reduced chi-squared = 1.310 for 57 degrees of freedom
# Null hypothesis probability = 5.832681e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.012e-08 1.690e-08
25- 50 3.026e-07 4.886e-08
50-150 4.062e-07 9.313e-08
15-150 7.890e-07 1.173e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.124 (-85.6575 -199.146)
Norm : 1.01370 (-0.114352 0.127402)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.388e-07 7.700e-08
25- 50 2.669e-07 1.451e-07
50-150 5.850e-07 3.229e-07
15-150 9.907e-07 5.411e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.40858 (-2.25315 3.52544)
R1^2/D10^2 : 0.304029 (-0.221252 1.1485)
kT2 [keV] : 21.2347 (-5.06323 15.3255)
R2^2/D10^2 : 6.58676E-03 (-0.00542663 0.012448)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.303e-07 7.117e-08
25- 50 2.732e-07 1.391e-07
50-150 5.479e-07 3.064e-07
15-150 9.514e-07 4.919e-07
Peak spectrum fit
Power-law model
Time interval is from 9.948 sec. to 10.948 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.38675 ( -0.54263 0.533683 )
Norm@50keV : 5.25459E-03 ( -0.00167869 0.00166649 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.74 using 59 PHA bins.
# Reduced chi-squared = 0.9078 for 57 degrees of freedom
# Null hypothesis probability = 6.719284e-01
Photon flux (15-150 keV) in 1 sec: 0.638011 ( -0.203717 0.204557 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.09134e-08 ( -1.7556e-08 1.80911e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 9.948 sec. to 10.948 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.666349 ( -3.6095 1.64734 )
Epeak [keV] : 89.2344 ( -89.2451 -89.2451 )
Norm@50keV : 1.25405E-02 ( -0.012538 1.0326 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.37 using 59 PHA bins.
# Reduced chi-squared = 0.9174 for 56 degrees of freedom
# Null hypothesis probability = 6.504024e-01
Photon flux (15-150 keV) in 1 sec: 0.623079 ( -0.208835 0.205944 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.79462e-08 ( -1.938e-08 1.97633e-08 ) ergs/cm2
Band function
Time interval is from 9.948 sec. to 10.948 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.98177 ( -4.98177 -4.98177 )
beta : -1.60910 ( -0.868777 0.629833 )
Epeak [keV] : 27.6829 ( -27.6829 15.5826 )
Norm@50keV : 289.420 ( -88.7418 3.17122e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.43 using 59 PHA bins.
# Reduced chi-squared = 0.9169 for 55 degrees of freedom
# Null hypothesis probability = 6.495599e-01
Photon flux (15-150 keV) in 1 sec: 0.621440 ( 6.37856 -0.207637 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.76277e-08 ( 0 0 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.5747 (-4.61103 8.27403)
R^2/D10^2 : 8.34336E-02 (-0.0832766 0.233273)
(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 3.727e-09 2.372e-09
25- 50 1.441e-08 8.735e-09
50-150 2.056e-08 1.385e-08
15-150 3.870e-08 2.481e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.359 (-199.361 -199.361)
Norm : 2.64592 (-0.830049 0.830998)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.589e-09 4.191e-09
25- 50 1.267e-08 7.845e-09
50-150 2.780e-08 1.695e-08
15-150 4.706e-08 2.844e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.69471 (-9.69471 8.85631)
R1^2/D10^2 : 0.251108 (-0.251107 -0.251107)
kT2 [keV] : 38.5388 (-38.5398 -38.5398)
R2^2/D10^2 : 2.08390E-03 (-0.00208373 0.0150687)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.162e-09 3.456e-09
25- 50 1.407e-08 9.000e-09
50-150 3.062e-08 1.625e-08
15-150 4.985e-08 2.579e-08
Plot creation:
Mon Oct 7 19:54:35 EDT 2024