batgrbproduct analysis for trigger=1263840
batgrbproduct Analysis for Trigger=1263840
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 Oct 31 20:40:30 EDT 2024
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1263840/GCN5_download_cron
======================================================================
Trigger: 01263840 Segment: 000
BAT Trigger Time: 752006095.36 [s; MET]
Trigger Stop: 752006097.408 [s; MET]
UTC: 2024-10-30T18:34:20.913240 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 50.7882858108845 Dec: 34.4325795095614 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.43
Image Trigger?: NO
Rate S/N Ratio: 28.3196045170126 [ if not an image trigger ]
Image S/N Ratio: 9.43
Flight Position: [ source = BAT ]
RA: 50.7882858108845 Dec: 34.4325795095614 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 50.7867300109062 Dec: 34.4394047427352 [deg; J2000]
{ 03h 23m 08.8s , +34d 26' 21.9" }
+/- 1.69324228530226 [arcmin] (estimated 90% radius based on SNR)
+/- 0.517950262021742 [arcmin] (formal 1-sigma fit error)
SNR: 14.3343102684664
Angular difference between Flight and Ground position is 0.416688 arcmin
Partial Coding Fraction: 0.1123047 [ including projection effects ]
Duration
T90: 6.73599994182587 +/- 1.55251546919483
Measured from: -1.03999984264374
to: 5.69600009918213 [s; relative to TRIGTIME]
T50: 2.68799996376038 +/- 0.56816901577529
Measured from: 0.256000161170959
to: 2.94400012493134 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.675999999046326
to: 1.67599999904633 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.58399999141693
to: 7.10399997234344 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.364414 0.706540 0.568669 0.163089
0.054351 0.060295 0.053910 0.041123 [error]
Peak 0.078562 0.141741 0.145050 0.041910
0.021486 0.024411 0.024298 0.017766 [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 1.45e-07 2.84e-07 4.30e-07 1.41e-06 1.21e-06 2.27e-06 erg/cm2
Error 2.40e-08 2.94e-08 5.05e-08 3.50e-07 1.26e-07 3.88e-07 erg/cm2
Peak flux Power-law 8.67e-01 1.02e+00 8.68e-01 1.25e+00 3.20e+00 4.01e+00 ph/cm2/s
Error 2.82e-01 2.14e-01 1.60e-01 4.57e-01 5.89e-01 6.96e-01 ph/cm2/s
Fluence Cutoff-PL 1.26e-07 3.06e-07 4.61e-07 5.51e-07 1.16e-06 1.44e-06 erg/cm2
Error 2.84e-08 3.62e-08 5.92e-08 4.50e-07 1.34e-07 4.59e-07 erg/cm2
Peak flux Cutoff-PL 7.37e-01 1.08e+00 9.62e-01 6.88e-01 3.17e+00 3.47e+00 ph/cm2/s
Error 3.40e-01 2.50e-01 2.27e-01 6.83e-01 5.90e-01 9.09e-01 ph/cm2/s
Fluence Band 1.17e-07 3.22e-07 4.36e-07 9.77e-07 1.16e-06 1.87e-06 erg/cm2
Error -------- -------- 7.40e-08 7.26e-07 1.30e-07 -------- erg/cm2
Peak flux Band -------- -------- -------- -------- -------- -------- 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 1.401 0.156 - - 1.44e-02 1.38e-03 63.400 57
CPL 0.622 0.694 93.0 92.4 3.45e-02 3.06e-02 58.930 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.235 0.271 - - 2.71e-02 4.72e-03 62.370 57
CPL 0.515 1.224 116.5 0.0 5.87e-02 0.00e+00 61.350 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: 5.568000 sec.
T50 in the 50-300 keV band: 2.240000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 8.688 -1.584 7.104
T90 6.736 -1.040 5.696
T50 2.688 0.256 2.944
Peak 1.000 0.676 1.676
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
50.7867 +34.4394 0.0134 38.7 70.7 1.8341 14.3 TRIG_01263840
------------------------------------------
Foreground time interval of the image:
-1.584 7.104 (delta_t = 8.688 [sec])
Background time interval of the image:
-103.959 -55.032 (delta_t = 48.927 [sec])
-54.360 -1.584 (delta_t = 52.776 [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 -1.584 sec. to 7.104 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.40075 ( -0.156001 0.156404 )
Norm@50keV : 1.43726E-02 ( -0.00138407 0.0013827 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.40 using 59 PHA bins.
# Reduced chi-squared = 1.112 for 57 degrees of freedom
# Null hypothesis probability = 2.608633e-01
Photon flux (15-150 keV) in 8.688 sec: 1.75060 ( -0.172864 0.173182 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.20639e-06 ( -1.25786e-07 1.26443e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.584 sec. to 7.104 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.622025 ( -0.749794 0.637809 )
Epeak [keV] : 92.9730 ( -23.8744 160.841 )
Norm@50keV : 3.44516E-02 ( -0.0173226 0.0438007 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.93 using 59 PHA bins.
# Reduced chi-squared = 1.052 for 56 degrees of freedom
# Null hypothesis probability = 3.689132e-01
Photon flux (15-150 keV) in 8.688 sec: 1.70531 ( -0.17693 0.17708 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.16225e-06 ( -1.33856e-07 1.33517e-07 ) ergs/cm2
Band function
Time interval is from -1.584 sec. to 7.104 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.621801 ( -0.727434 0.716763 )
beta : -10.0000 ( 10 7.10543e-15 )
Epeak [keV] : 92.9481 ( -22.2885 54.1254 )
Norm@50keV : 3.44595E-02 ( -0.0173241 0.0439447 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.93 using 59 PHA bins.
# Reduced chi-squared = 1.071 for 55 degrees of freedom
# Null hypothesis probability = 3.338980e-01
Photon flux (15-150 keV) in 8.688 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.16429e-06 ( -1.16423e-06 -1.30233e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 16.2088 (-1.80791 2.10231)
R^2/D10^2 : 0.160611 (-0.0558443 0.0821625)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.75 using 59 PHA bins.
# Reduced chi-squared = 1.311 for 57 degrees of freedom
# Null hypothesis probability = 5.746265e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.558e-08 1.276e-08
25- 50 3.215e-07 4.683e-08
50-150 5.934e-07 1.092e-07
15-150 9.905e-07 1.200e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-41.0145 -200)
Norm : 7.29750 (-0.698379 0.698379)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.579e-07 2.771e-08
25- 50 3.037e-07 8.614e-08
50-150 6.660e-07 3.350e-07
15-150 1.128e-06 3.908e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.10134 (-2.72313 2.85648)
R1^2/D10^2 : 0.700016 (-0.373163 0.669016)
kT2 [keV] : 28.9862 (-7.81992 21.2797)
R2^2/D10^2 : 1.53386E-02 (-0.0129509 0.0369828)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.165e-07 6.253e-08
25- 50 3.221e-07 1.494e-07
50-150 7.379e-07 3.863e-07
15-150 1.177e-06 5.473e-07
Peak spectrum fit
Power-law model
Time interval is from 0.676 sec. to 1.676 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.23494 ( -0.275531 0.266568 )
Norm@50keV : 2.71418E-02 ( -0.00472288 0.00470795 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.37 using 59 PHA bins.
# Reduced chi-squared = 1.094 for 57 degrees of freedom
# Null hypothesis probability = 2.910907e-01
Photon flux (15-150 keV) in 1 sec: 3.20248 ( -0.58762 0.59009 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.72725e-07 ( -4.86749e-08 4.87575e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.676 sec. to 1.676 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.514725 ( -1.53768 0.909553 )
Epeak [keV] : 116.499 ( )
Norm@50keV : 5.86627E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.35 using 59 PHA bins.
# Reduced chi-squared = 1.096 for 56 degrees of freedom
# Null hypothesis probability = 2.900749e-01
Photon flux (15-150 keV) in 1 sec: 3.16876 ( -0.58809 0.59209 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.70292e-07 ( -5.0302e-08 4.9727e-08 ) ergs/cm2
Band function
Time interval is from 0.676 sec. to 1.676 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.797615 ( -0.42858 -0.42858 )
beta : -1.62471 ( 1.62162 0.536242 )
Epeak [keV] : 61.2068 ( -60.3237 78.4256 )
Norm@50keV : 0.325787 ( -0.364942 70.1566 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.44 using 59 PHA bins.
# Reduced chi-squared = 1.099 for 55 degrees of freedom
# Null hypothesis probability = 2.859512e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.68859e-07 ( -2.68852e-07 -4.9363e-08 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 18.9540 (-3.29657 4.23894)
R^2/D10^2 : 0.188238 (-0.0956154 0.173045)
(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 1.330e-08 4.934e-09
25- 50 6.388e-08 1.795e-08
50-150 1.686e-07 4.765e-08
15-150 2.458e-07 6.070e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-53.7052 -200)
Norm : 13.6667 (-2.40111 2.40111)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.405e-08 1.981e-08
25- 50 6.550e-08 3.727e-08
50-150 1.437e-07 8.190e-08
15-150 2.432e-07 1.382e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 13.3133 (-5.72877 5.69679)
R1^2/D10^2 : 0.488240 (-0.297353 1.11659)
kT2 [keV] : 107.280 (-98.2786 -107.118)
R2^2/D10^2 : 9.57985E-04 (-0.000761076 0.0874623)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.971e-08 1.201e-08
25- 50 6.924e-08 4.009e-08
50-150 1.812e-07 8.895e-08
15-150 2.701e-07 1.324e-07
Plot creation:
Thu Oct 31 20:44:29 EDT 2024