batgrbproduct analysis for trigger=1142997
batgrbproduct Analysis for Trigger=1142997
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): Sat Dec 3 18:57:13 EST 2022
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1142997/GCN5_download_cron
======================================================================
Trigger: 01142997 Segment: 000
BAT Trigger Time: 691704400.896 [s; MET]
Trigger Stop: 691704404.992 [s; MET]
UTC: 2022-12-02T20:06:10.572640 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 77.0950930217306 Dec: -59.8061378421313 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.44
Image Trigger?: NO
Rate S/N Ratio: 11.6189500386223 [ if not an image trigger ]
Image S/N Ratio: 7.44
Flight Position: [ source = BAT ]
RA: 77.0950930217306 Dec: -59.8061378421313 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 77.0019149933964 Dec: -59.8358214427098 [deg; J2000]
{ 05h 08m 00.5s , -59d 50' 09.0" }
+/- 2.13598900258352 [arcmin] (estimated 90% radius based on SNR)
+/- 1.16982318428007 [arcmin] (formal 1-sigma fit error)
SNR: 10.2863819909798
Angular difference between Flight and Ground position is 3.327262 arcmin
Partial Coding Fraction: 0.8515625 [ including projection effects ]
Duration
T90: 10.336000084877 +/- 1.21188779375741
Measured from: 1.2720000743866
to: 11.6080001592636 [s; relative to TRIGTIME]
T50: 5.75999999046326 +/- 2.24151368053652
Measured from: 2.82400012016296
to: 8.58400011062622 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 3.30799996852875
to: 4.30799996852875 [s; relative to TRIGTIME]
Total Fluence
Measured from: 1.03199994564056
to: 12.4399999380112 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.167286 0.225836 0.128939 0.024783
0.027444 0.028876 0.024986 0.021882 [error]
Peak 0.023665 0.043277 0.026660 0.005327
0.008259 0.008648 0.007622 0.006475 [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 5.00e-08 8.44e-08 1.08e-07 2.79e-07 3.20e-07 5.22e-07 erg/cm2
Error 1.08e-08 1.23e-08 2.35e-08 1.23e-07 5.60e-08 1.46e-07 erg/cm2
Peak flux Power-law 2.22e-01 2.37e-01 1.80e-01 2.22e-01 7.24e-01 8.62e-01 ph/cm2/s
Error 9.82e-02 6.63e-02 5.89e-02 1.51e-01 1.90e-01 2.33e-01 ph/cm2/s
Fluence Cutoff-PL 4.61e-08 9.34e-08 1.08e-07 8.18e-08 2.96e-07 3.30e-07 erg/cm2
Error 1.22e-08 1.71e-08 2.73e-08 2.23e-07 6.24e-08 1.83e-07 erg/cm2
Peak flux Cutoff-PL 2.08e-01 2.49e-01 1.86e-01 1.33e-01 7.13e-01 7.75e-01 ph/cm2/s
Error 1.12e-01 8.13e-02 6.58e-02 1.97e-01 1.95e-01 2.42e-01 ph/cm2/s
Fluence Band 4.47e-08 9.67e-08 1.02e-07 1.74e-07 3.02e-07 4.20e-07 erg/cm2
Error -------- -------- -------- -------- -------- -------- 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 1.640 0.251 - - 3.01e-03 4.89e-04 33.720 57
CPL 0.832 1.127 64.2 -23.5 8.47e-03 2.39e-02 31.870 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.398 0.453 - - 5.95e-03 1.58e-03 58.930 57
CPL 0.974 1.963 117.7 0.0 9.90e-03 9.18e-02 58.770 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 11.408 1.032 12.440
T90 10.336 1.272 11.608
T50 5.760 2.824 8.584
Peak 1.000 3.308 4.308
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
77.0019 -59.8358 0.0188 14.1 -73.7 0.5373 10.3 TRIG_01142997
------------------------------------------
Foreground time interval of the image:
1.032 12.440 (delta_t = 11.408 [sec])
Background time interval of the image:
-239.896 1.032 (delta_t = 240.928 [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 1.032 sec. to 12.440 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.64025 ( -0.245572 0.256027 )
Norm@50keV : 3.01100E-03 ( -0.000494336 0.000484295 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 33.72 using 59 PHA bins.
# Reduced chi-squared = 0.5916 for 57 degrees of freedom
# Null hypothesis probability = 9.940022e-01
Photon flux (15-150 keV) in 11.41 sec: 0.391907 ( -0.0569933 0.0570042 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.19838e-07 ( -5.53134e-08 5.67009e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.032 sec. to 12.440 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.831808 ( -1.33649 0.917868 )
Epeak [keV] : 64.2098 ( -17.265 -64.2098 )
Norm@50keV : 8.47358E-03 ( -0.00847358 0.0394179 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 31.87 using 59 PHA bins.
# Reduced chi-squared = 0.5691 for 56 degrees of freedom
# Null hypothesis probability = 9.961078e-01
Photon flux (15-150 keV) in 11.41 sec: 0.381374 ( -0.058485 0.058485 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.95748e-07 ( -6.07708e-08 6.3985e-08 ) ergs/cm2
Band function
Time interval is from 1.032 sec. to 12.440 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 6.75043E-02 ( -2.37397 -0.708399 )
beta : -2.06941 ( 1.98637 0.477531 )
Epeak [keV] : 44.3787 ( -38.4185 122.498 )
Norm@50keV : 3.34117E-02 ( -0.0321321 85.5819 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 31.56 using 59 PHA bins.
# Reduced chi-squared = 0.5738 for 55 degrees of freedom
# Null hypothesis probability = 9.953373e-01
Photon flux (15-150 keV) in 11.41 sec: 0.384028 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.01529e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.0011 (-1.94005 2.41897)
R^2/D10^2 : 9.83697E-02 (-0.0477872 0.0878854)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.56 using 59 PHA bins.
# Reduced chi-squared = 0.6765 for 57 degrees of freedom
# Null hypothesis probability = 9.709102e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.419e-08 9.236e-09
25- 50 1.076e-07 2.218e-08
50-150 9.320e-08 3.247e-08
15-150 2.350e-07 4.786e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 140.643 (-64.014 -138.835)
Norm : 1.64295 (-0.256148 0.339117)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.839e-08 2.715e-08
25- 50 8.884e-08 4.877e-08
50-150 1.706e-07 1.055e-07
15-150 3.079e-07 1.771e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.72935 (-3.58205 3.27179)
R1^2/D10^2 : 0.327152 (-0.211615 1.94877)
kT2 [keV] : 24.8240 (-16.2586 110.96)
R2^2/D10^2 : 4.62134E-03 (-0.00456391 0.0404295)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.493e-08 2.593e-08
25- 50 9.670e-08 5.075e-08
50-150 1.616e-07 9.037e-08
15-150 3.033e-07 1.579e-07
Peak spectrum fit
Power-law model
Time interval is from 3.308 sec. to 4.308 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.39838 ( -0.452324 0.453948 )
Norm@50keV : 5.94654E-03 ( -0.00158717 0.00156862 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.93 using 59 PHA bins.
# Reduced chi-squared = 1.034 for 57 degrees of freedom
# Null hypothesis probability = 4.046070e-01
Photon flux (15-150 keV) in 1 sec: 0.723913 ( -0.189651 0.190015 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.74778e-08 ( -1.67907e-08 1.72633e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 3.308 sec. to 4.308 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.974167 ( -2.46811 1.45874 )
Epeak [keV] : 117.733 ( -117.75 -117.75 )
Norm@50keV : 9.89596E-03 ( -0.00547203 0.178162 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.77 using 59 PHA bins.
# Reduced chi-squared = 1.049 for 56 degrees of freedom
# Null hypothesis probability = 3.745221e-01
Photon flux (15-150 keV) in 1 sec: 0.713095 ( -0.195612 0.194617 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.54598e-08 ( -1.87754e-08 1.87622e-08 ) ergs/cm2
Band function
Time interval is from 3.308 sec. to 4.308 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.376490 ( 0.330604 0.330604 )
beta : -1.63712 ( 1.64765 0.66413 )
Epeak [keV] : 61.8656 ( -58.7269 182.711 )
Norm@50keV : 2.36941E-02 ( -0.0293983 391.601 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.54 using 59 PHA bins.
# Reduced chi-squared = 1.064 for 55 degrees of freedom
# Null hypothesis probability = 3.469149e-01
Photon flux (15-150 keV) in 1 sec: ( ) 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] : 14.9432 (-4.40966 6.65763)
R^2/D10^2 : 8.56583E-02 (-0.0615589 0.20163)
(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 4.007e-09 2.429e-09
25- 50 1.587e-08 8.920e-09
50-150 2.407e-08 1.555e-08
15-150 4.394e-08 2.453e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.362 (-119.004 -199.363)
Norm : 2.98257 (-0.772722 0.773675)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.427e-09 4.477e-09
25- 50 1.429e-08 8.585e-09
50-150 3.133e-08 1.877e-08
15-150 5.305e-08 3.239e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.09339 (-7.33967 7.0435)
R1^2/D10^2 : 0.341434 (-0.160027 345.92)
kT2 [keV] : 37.5045 (-35.7943 -37.5045)
R2^2/D10^2 : 2.74242E-03 (-0.00265656 0.0981352)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.047e-09 3.678e-09
25- 50 1.542e-08 9.200e-09
50-150 3.538e-08 2.003e-08
15-150 5.685e-08 2.950e-08
Plot creation:
Sat Dec 3 19:00:34 EST 2022