batgrbproduct analysis for trigger=1251252
batgrbproduct Analysis for Trigger=1251252
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 Aug 30 07:04:24 EDT 2024
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1251252/GCN5_download_cron
======================================================================
Trigger: 01251252 Segment: 000
BAT Trigger Time: 746596622.528 [s; MET]
Trigger Stop: 746596623.552 [s; MET]
UTC: 2024-08-29T03:56:28.451440 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 143.059023378014 Dec: -18.7280334116614 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8
Image Trigger?: NO
Rate S/N Ratio: 15.6843871413581 [ if not an image trigger ]
Image S/N Ratio: 8
Flight Position: [ source = BAT ]
RA: 143.059023378014 Dec: -18.7280334116614 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 143.072274565919 Dec: -18.6903062888585 [deg; J2000]
{ 09h 32m 17.3s , -18d 41' 25.1" }
+/- 1.37399089972309 [arcmin] (estimated 90% radius based on SNR)
+/- 0.610714489883682 [arcmin] (formal 1-sigma fit error)
SNR: 19.3196202361429
Angular difference between Flight and Ground position is 2.385604 arcmin
Partial Coding Fraction: 0.1523438 [ including projection effects ]
Duration
T90: 43.2000000476837 +/- 10.4744931744979
Measured from: -0.391999840736389
to: 42.8080002069473 [s; relative to TRIGTIME]
T50: 18.944000005722 +/- 2.23263062135781
Measured from: 3.70400011539459
to: 22.6480001211166 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.187999963760376
to: 1.18799996376038 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.91199994087219
to: 57 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.618250 2.285895 1.651978 0.372975
0.124709 0.132213 0.111730 0.090043 [error]
Peak 0.091776 0.119581 0.146132 0.006626
0.017639 0.021032 0.019607 0.013065 [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 6.17e-07 1.00e-06 1.23e-06 2.98e-06 3.70e-06 5.84e-06 erg/cm2
Error 6.56e-08 6.72e-08 1.11e-07 5.55e-07 2.65e-07 6.51e-07 erg/cm2
Peak flux Power-law 1.20e+00 8.66e-01 4.13e-01 2.77e-01 2.61e+00 2.76e+00 ph/cm2/s
Error 2.74e-01 1.57e-01 9.50e-02 1.05e-01 4.80e-01 5.00e-01 ph/cm2/s
Fluence Cutoff-PL 5.73e-07 1.06e-06 1.27e-06 1.46e-06 3.58e-06 4.36e-06 erg/cm2
Error 7.61e-08 8.45e-08 1.21e-07 9.45e-07 2.87e-07 9.73e-07 erg/cm2
Peak flux Cutoff-PL 7.27e-01 1.28e+00 7.29e-01 8.66e-02 2.82e+00 2.82e+00 ph/cm2/s
Error 3.23e-01 2.29e-01 1.86e-01 6.09e-02 4.93e-01 4.96e-01 ph/cm2/s
Fluence Band 5.67e-07 1.05e-06 1.26e-06 1.63e-06 3.58e-06 4.56e-06 erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+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 1.703 0.112 - - 6.78e-03 4.65e-04 46.600 57
CPL 1.203 0.462 77.4 91.8 1.23e-02 7.18e-03 42.750 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.071 0.225 - - 1.69e-02 3.31e-03 87.790 57
CPL -0.964 1.422 53.4 7.4 5.39e-01 1.46e+00 66.480 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: 24.960000 sec.
T50 in the 50-300 keV band: 13.888000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 58.912 -1.912 57.000
T90 43.200 -0.392 42.808
T50 18.944 3.704 22.648
Peak 1.000 0.188 1.188
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
143.0723 -18.6903 0.0100 39.3 -67.4 6.4618 19.3 TRIG_01251252
------------------------------------------
Foreground time interval of the image:
-1.912 57.000 (delta_t = 58.912 [sec])
Background time interval of the image:
-239.528 -1.912 (delta_t = 237.616 [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 -1.912 sec. to 57.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.70255 ( -0.111718 0.113177 )
Norm@50keV : 6.78144E-03 ( -0.000466479 0.000463871 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.60 using 59 PHA bins.
# Reduced chi-squared = 0.8176 for 57 degrees of freedom
# Null hypothesis probability = 8.357048e-01
Photon flux (15-150 keV) in 58.91 sec: 0.901455 ( -0.0607634 0.0608537 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.69799e-06 ( -2.64721e-07 2.66256e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.912 sec. to 57.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.20311 ( -0.486543 0.438195 )
Epeak [keV] : 77.4468 ( -18.2293 165.301 )
Norm@50keV : 1.23256E-02 ( -0.00492648 0.00943821 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.75 using 59 PHA bins.
# Reduced chi-squared = 0.7634 for 56 degrees of freedom
# Null hypothesis probability = 9.036300e-01
Photon flux (15-150 keV) in 58.91 sec: 0.883048 ( -0.062863 0.062878 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.5759e-06 ( -2.87198e-07 2.87781e-07 ) ergs/cm2
Band function
Time interval is from -1.912 sec. to 57.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.21548 ( -0.423621 0.364538 )
beta : -9.36130 ( 9.3716 19.3716 )
Epeak [keV] : 78.6130 ( -17.0534 56.0861 )
Norm@50keV : 1.21163E-02 ( -0.00461595 0.00266413 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.76 using 59 PHA bins.
# Reduced chi-squared = 0.7774 for 55 degrees of freedom
# Null hypothesis probability = 8.854233e-01
Photon flux (15-150 keV) in 58.91 sec: 0.884152 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.57602e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.4578 (-1.07357 1.16752)
R^2/D10^2 : 0.144829 (-0.0382996 0.0518767)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 94.73 using 59 PHA bins.
# Reduced chi-squared = 1.662 for 57 degrees of freedom
# Null hypothesis probability = 1.256464e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.274e-07 3.956e-08
25- 50 1.170e-06 9.190e-08
50-150 1.366e-06 1.912e-07
15-150 2.863e-06 2.189e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 136.150 (-34.2402 47.4164)
Norm : 3.73679 (-0.293683 0.369105)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.695e-07 5.446e-08
25- 50 1.040e-06 1.146e-07
50-150 1.970e-06 6.651e-07
15-150 3.580e-06 7.540e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.28668 (-1.12549 1.34674)
R1^2/D10^2 : 1.46261 (-0.710924 1.55801)
kT2 [keV] : 22.0766 (-3.42725 5.40023)
R2^2/D10^2 : 1.82870E-02 (-0.0104467 0.0174782)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.794e-07 1.821e-07
25- 50 1.046e-06 2.082e-07
50-150 1.931e-06 6.595e-07
15-150 3.556e-06 7.461e-07
Peak spectrum fit
Power-law model
Time interval is from 0.188 sec. to 1.188 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.07076 ( -0.212613 0.23704 )
Norm@50keV : 1.68607E-02 ( -0.00333359 0.0032861 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 87.79 using 59 PHA bins.
# Reduced chi-squared = 1.540 for 57 degrees of freedom
# Null hypothesis probability = 5.474738e-03
Photon flux (15-150 keV) in 1 sec: 2.61479 ( -0.480123 0.480442 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.56258e-07 ( -2.95977e-08 2.9648e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.188 sec. to 1.188 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.963861 ( -1.62562 1.21753 )
Epeak [keV] : 53.4448 ( -7.40597 7.3861 )
Norm@50keV : 0.538719 ( -0.538992 2.38391 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.48 using 59 PHA bins.
# Reduced chi-squared = 1.187 for 56 degrees of freedom
# Null hypothesis probability = 1.594714e-01
Photon flux (15-150 keV) in 1 sec: 2.81516 ( -0.49395 0.49238 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.89986e-07 ( -3.3274e-08 3.3404e-08 ) ergs/cm2
Band function
Time interval is from 0.188 sec. to 1.188 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.958643 ( -1.19376 1.62871 )
beta : -9.37167 ( 9.37167 19.3707 )
Epeak [keV] : 53.4506 ( -7.26366 7.3524 )
Norm@50keV : 0.535553 ( -0.535571 2.42746 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.48 using 59 PHA bins.
# Reduced chi-squared = 1.209 for 55 degrees of freedom
# Null hypothesis probability = 1.380143e-01
Photon flux (15-150 keV) in 1 sec: 0.0 ( ) 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] : 13.9360 (-1.81315 1.81607)
R^2/D10^2 : 0.489000 (-0.185575 0.317691)
(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 2.007e-08 5.565e-09
25- 50 7.430e-08 1.509e-08
50-150 9.480e-08 2.979e-08
15-150 1.892e-07 3.840e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 70.7052 (-19.3406 27.9725)
Norm : 14.3000 (-3.01349 3.38925)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.673e-08 8.070e-09
25- 50 5.859e-08 1.070e-08
50-150 7.582e-08 2.610e-08
15-150 1.711e-07 3.700e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.16503 (-4.00974 11.4497)
R1^2/D10^2 : 9.69311 (-10.314 -10.314)
kT2 [keV] : 14.8410 (-2.11095 -14.8166)
R2^2/D10^2 : 0.358029 (-0.359509 0.284784)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.723e-08 1.349e-08
25- 50 6.939e-08 3.278e-08
50-150 9.713e-08 4.214e-08
15-150 1.937e-07 6.909e-08
Plot creation:
Fri Aug 30 07:09:38 EDT 2024