batgrbproduct analysis for trigger=1248132
batgrbproduct Analysis for Trigger=1248132
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 Aug 12 20:45:13 EDT 2024
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1248132/GCN5_download_cron
======================================================================
Trigger: 01248132 Segment: 000
BAT Trigger Time: 745078087.168 [s; MET]
Trigger Stop: 745078088.192 [s; MET]
UTC: 2024-08-11T14:07:33.195260 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 226.373405898408 Dec: 28.8543974887752 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.37
Image Trigger?: NO
Rate S/N Ratio: 8.88819441731559 [ if not an image trigger ]
Image S/N Ratio: 7.37
Flight Position: [ source = BAT ]
RA: 226.373405898408 Dec: 28.8543974887752 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 226.32810416859 Dec: 28.8841797874286 [deg; J2000]
{ 15h 05m 18.7s , +28d 53' 03.0" }
+/- 1.77731942020282 [arcmin] (estimated 90% radius based on SNR)
+/- 1.05241413426037 [arcmin] (formal 1-sigma fit error)
SNR: 13.3755159135014
Angular difference between Flight and Ground position is 2.976409 arcmin
Partial Coding Fraction: 0.71875 [ including projection effects ]
Duration
T90: 66.5439999103546 +/- 5.07424877432148
Measured from: -32.6479998826981
to: 33.8960000276566 [s; relative to TRIGTIME]
T50: 15.3879998922348 +/- 2.17532804921121
Measured from: 1.90400016307831
to: 17.2920000553131 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 11.3040000200272
to: 12.3040000200272 [s; relative to TRIGTIME]
Total Fluence
Measured from: -42.9520000219345
to: 41.3240000009537 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.460779 1.859059 1.237285 0.187093
0.082056 0.073285 0.061123 0.050628 [error]
Peak 0.083247 0.132947 0.106077 0.021626
0.010400 0.010209 0.009148 0.006767 [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 4.91e-07 7.97e-07 9.78e-07 2.36e-06 2.94e-06 4.63e-06 erg/cm2
Error 4.05e-08 3.93e-08 6.15e-08 3.21e-07 1.47e-07 3.66e-07 erg/cm2
Peak flux Power-law 9.77e-01 9.58e-01 6.58e-01 7.10e-01 2.88e+00 3.30e+00 ph/cm2/s
Error 1.47e-01 9.09e-02 7.30e-02 1.58e-01 2.62e-01 2.93e-01 ph/cm2/s
Fluence Cutoff-PL 4.64e-07 8.22e-07 9.93e-07 1.45e-06 2.86e-06 3.73e-06 erg/cm2
Error 4.79e-08 4.62e-08 6.55e-08 5.07e-07 1.64e-07 7.01e-07 erg/cm2
Peak flux Cutoff-PL 8.49e-01 1.02e+00 7.03e-01 3.63e-01 2.79e+00 2.93e+00 ph/cm2/s
Error 1.79e-01 1.07e-01 8.63e-02 2.22e-01 2.72e-01 3.53e-01 ph/cm2/s
Fluence Band 4.44e-07 8.37e-07 9.58e-07 2.09e-06 2.87e-06 4.34e-06 erg/cm2
Error 5.45e-08 4.96e-08 4.81e-08 -------- 1.54e-07 -------- erg/cm2
Peak flux Band 8.63e-01 1.01e+00 7.01e-01 4.00e-01 2.81e+00 2.97e+00 ph/cm2/s
Error -------- -------- 8.54e-02 -------- -------- -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.705 0.085 - - 3.77e-03 1.81e-04 65.520 57
CPL 1.376 0.330 93.7 290.3 5.52e-03 2.14e-03 62.330 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.543 0.149 - - 2.28e-02 2.05e-03 72.060 57
CPL 0.835 0.654 85.0 93.0 5.08e-02 4.24e-02 67.970 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: 29.952000 sec.
T50 in the 50-300 keV band: 8.512000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 84.276 -42.952 41.324
T90 66.544 -32.648 33.896
T50 15.388 1.904 17.292
Peak 1.000 11.304 12.304
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
226.3281 +28.8842 0.0144 33.0 -23.4 2.9220 13.4 TRIG_01248132
------------------------------------------
Foreground time interval of the image:
-42.952 9.533 (delta_t = 52.485 [sec])
Background time interval of the image:
-60.168 -42.952 (delta_t = 17.216 [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 -42.952 sec. to 41.324 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.70508 ( -0.0849801 0.0853891 )
Norm@50keV : 3.76603E-03 ( -0.000180748 0.00018026 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.52 using 59 PHA bins.
# Reduced chi-squared = 1.149 for 57 degrees of freedom
# Null hypothesis probability = 2.053299e-01
Photon flux (15-150 keV) in 84.28 sec: 0.501062 ( -0.0248951 0.0249666 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.9376e-06 ( -1.46479e-07 1.46978e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -42.952 sec. to 41.324 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.37627 ( -0.342662 0.316394 )
Epeak [keV] : 93.7423 ( -25.5889 554.963 )
Norm@50keV : 5.52320E-03 ( -0.0016583 0.00262435 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.33 using 59 PHA bins.
# Reduced chi-squared = 1.113 for 56 degrees of freedom
# Null hypothesis probability = 2.611752e-01
Photon flux (15-150 keV) in 84.28 sec: 0.491213 ( -0.026514 0.026563 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.86147e-06 ( -1.64675e-07 1.64304e-07 ) ergs/cm2
Band function
Time interval is from -42.952 sec. to 41.324 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.35967 ( -0.294751 0.270731 )
beta : -4.65804 ( 8.42974 18.4297 )
Epeak [keV] : 92.4150 ( -43.1083 65.2857 )
Norm@50keV : 5.61156E-03 ( -0.00175051 0.00107858 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.34 using 59 PHA bins.
# Reduced chi-squared = 1.133 for 55 degrees of freedom
# Null hypothesis probability = 2.314861e-01
Photon flux (15-150 keV) in 84.28 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.86984e-06 ( -2.86925e-06 -1.52985e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.6106 ( )
R^2/D10^2 : 7.41846E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 170.07 using 59 PHA bins.
# Reduced chi-squared = 2.9837 for 57 degrees of freedom
# Null hypothesis probability = 3.479646e-13
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.452e-07 2.288e-08
25- 50 8.864e-07 5.065e-08
50-150 1.065e-06 9.819e-08
15-150 2.197e-06 1.155e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 140.454 (-29.0447 34.7801)
Norm : 2.04890 (-0.118838 0.151997)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.458e-07 3.637e-08
25- 50 8.183e-07 5.942e-08
50-150 1.571e-06 4.488e-07
15-150 2.835e-06 4.918e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.99235 (-0.870686 0.947293)
R1^2/D10^2 : 0.593052 (-0.212346 0.364992)
kT2 [keV] : 25.8167 (-3.63676 5.27295)
R2^2/D10^2 : 5.52605E-03 (-0.0026969 0.0042924)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.452e-07 6.671e-08
25- 50 8.415e-07 1.008e-07
50-150 1.591e-06 3.498e-07
15-150 2.877e-06 4.450e-07
Peak spectrum fit
Power-law model
Time interval is from 11.304 sec. to 12.304 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.54298 ( -0.147667 0.149988 )
Norm@50keV : 2.27756E-02 ( -0.00205718 0.00204962 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.06 using 59 PHA bins.
# Reduced chi-squared = 1.264 for 57 degrees of freedom
# Null hypothesis probability = 8.630870e-02
Photon flux (15-150 keV) in 1 sec: 2.87745 ( -0.261548 0.26205 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.14629e-07 ( -2.07725e-08 2.08979e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 11.304 sec. to 12.304 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.834981 ( -0.7047 0.60429 )
Epeak [keV] : 85.0008 ( -20.9581 165.128 )
Norm@50keV : 5.08199E-02 ( -0.024764 0.0600522 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.97 using 59 PHA bins.
# Reduced chi-squared = 1.214 for 56 degrees of freedom
# Null hypothesis probability = 1.311773e-01
Photon flux (15-150 keV) in 1 sec: 2.79218 ( -0.27132 0.27172 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.06624e-07 ( -2.234e-08 2.2291e-08 ) ergs/cm2
Band function
Time interval is from 11.304 sec. to 12.304 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.834919 ( -0.548221 0.671666 )
beta : -10.0000 ( 10 1.77636e-15 )
Epeak [keV] : 84.9838 ( -17.7464 165.222 )
Norm@50keV : 5.08211E-02 ( -0.0247605 0.060083 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.97 using 59 PHA bins.
# Reduced chi-squared = 1.236 for 55 degrees of freedom
# Null hypothesis probability = 1.125622e-01
Photon flux (15-150 keV) in 1 sec: 2.80719 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.06508e-07 ( 0 0 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 15.2181 (-1.57399 1.76592)
R^2/D10^2 : 0.313855 (-0.101175 0.147829)
(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 1.518e-08 2.595e-09
25- 50 6.112e-08 7.330e-09
50-150 9.694e-08 1.788e-08
15-150 1.732e-07 1.945e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.229 (-67.4401 -199.271)
Norm : 11.7878 (-1.0283 1.12924)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.936e-08 3.920e-09
25- 50 5.647e-08 9.830e-09
50-150 1.238e-07 4.881e-08
15-150 2.096e-07 7.904e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.05658 (-2.37451 2.84295)
R1^2/D10^2 : 2.53899 (-1.61969 5.28393)
kT2 [keV] : 23.0620 (-4.84366 10.562)
R2^2/D10^2 : 5.63492E-02 (-0.0434645 0.0890322)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.590e-08 1.288e-08
25- 50 5.796e-08 2.674e-08
50-150 1.219e-07 6.008e-08
15-150 2.058e-07 8.533e-08
Plot creation:
Mon Aug 12 20:47:44 EDT 2024