batgrbproduct analysis for trigger=1215912
batgrbproduct Analysis for Trigger=1215912
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 Feb 19 22:31:28 EST 2024
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1215912/GCN5_download_cron
======================================================================
Trigger: 01215912 Segment: 000
BAT Trigger Time: 729914433.6 [s; MET]
Trigger Stop: 729914434.624 [s; MET]
UTC: 2024-02-18T02:00:00.666040 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 161.780800958629 Dec: 1.30403195307657 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.54
Image Trigger?: NO
Rate S/N Ratio: 11.3578166916005 [ if not an image trigger ]
Image S/N Ratio: 6.54
Flight Position: [ source = BAT ]
RA: 161.780800958629 Dec: 1.30403195307657 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 161.809994725513 Dec: 1.29450286104981 [deg; J2000]
{ 10h 47m 14.4s , +01d 17' 40.2" }
+/- 1.30429979755249 [arcmin] (estimated 90% radius based on SNR)
+/- 0.442494316030125 [arcmin] (formal 1-sigma fit error)
SNR: 20.8110256481878
Angular difference between Flight and Ground position is 1.842148 arcmin
Partial Coding Fraction: 0.3671875 [ including projection effects ]
Duration
T90: 66.9279999732971 +/- 11.2754600847181
Measured from: -18.8799998760223
to: 48.0480000972748 [s; relative to TRIGTIME]
T50: 24.6400001049042 +/- 1.67175117700055
Measured from: -0.0799999237060547
to: 24.5600001811981 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 21.6200000047684
to: 22.6200000047684 [s; relative to TRIGTIME]
Total Fluence
Measured from: -38.9279999732971
to: 63.5519999265671 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.102438 3.073910 2.458048 0.606351
0.103381 0.110554 0.095694 0.078517 [error]
Peak 0.069931 0.136162 0.121070 0.025685
0.012344 0.013837 0.012946 0.009214 [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 7.38e-07 1.35e-06 1.89e-06 5.54e-06 5.41e-06 9.51e-06 erg/cm2
Error 5.57e-08 6.07e-08 9.65e-08 6.23e-07 2.36e-07 6.85e-07 erg/cm2
Peak flux Power-law 9.21e-01 9.78e-01 7.37e-01 9.01e-01 2.98e+00 3.54e+00 ph/cm2/s
Error 1.75e-01 1.19e-01 1.01e-01 2.45e-01 3.42e-01 4.08e-01 ph/cm2/s
Fluence Cutoff-PL 6.62e-07 1.40e-06 1.97e-06 2.87e-06 5.24e-06 6.90e-06 erg/cm2
Error 6.95e-08 7.04e-08 1.10e-07 1.07e-06 2.59e-07 1.08e-06 erg/cm2
Peak flux Cutoff-PL 7.36e-01 1.07e+00 8.20e-01 3.43e-01 2.87e+00 2.97e+00 ph/cm2/s
Error 2.13e-01 1.46e-01 1.25e-01 2.56e-01 3.52e-01 4.30e-01 ph/cm2/s
Fluence Band 6.54e-07 1.40e-06 1.96e-06 3.47e-06 5.23e-06 7.48e-06 erg/cm2
Error 7.04e-08 -------- -------- -------- 2.60e-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 1.512 0.073 - - 5.57e-03 2.28e-04 71.300 57
CPL 0.996 0.316 103.1 45.5 9.82e-03 3.42e-03 62.590 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.409 0.181 - - 2.44e-02 2.78e-03 69.030 57
CPL 0.284 0.909 79.3 45.0 8.67e-02 1.11e-01 63.260 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: 54.336000 sec.
T50 in the 50-300 keV band: 23.232000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 102.480 -38.928 63.552
T90 66.928 -18.880 48.048
T50 24.640 -0.080 24.560
Peak 1.000 21.620 22.620
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
161.8100 +1.2945 0.0093 35.1 131.1 3.6717 20.8 TRIG_01215912
------------------------------------------
Foreground time interval of the image:
-38.928 8.601 (delta_t = 47.529 [sec])
Background time interval of the image:
-239.600 -38.928 (delta_t = 200.672 [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 -38.928 sec. to 63.552 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.51192 ( -0.0725048 0.0726414 )
Norm@50keV : 5.57370E-03 ( -0.000228378 0.000228277 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.30 using 59 PHA bins.
# Reduced chi-squared = 1.251 for 57 degrees of freedom
# Null hypothesis probability = 9.642278e-02
Photon flux (15-150 keV) in 102.5 sec: 0.698070 ( -0.0303957 0.0304671 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.40927e-06 ( -2.361e-07 2.36651e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -38.928 sec. to 63.552 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.995765 ( -0.326899 0.304889 )
Epeak [keV] : 103.128 ( -21.1764 69.8514 )
Norm@50keV : 9.82027E-03 ( -0.00273444 0.00411503 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.59 using 59 PHA bins.
# Reduced chi-squared = 1.118 for 56 degrees of freedom
# Null hypothesis probability = 2.538997e-01
Photon flux (15-150 keV) in 102.5 sec: 0.677396 ( -0.032442 0.032592 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.23833e-06 ( -2.5953e-07 2.58659e-07 ) ergs/cm2
Band function
Time interval is from -38.928 sec. to 63.552 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.985480 ( -0.308843 0.699957 )
beta : -2.21507 ( 2.1789 0.556568 )
Epeak [keV] : 101.695 ( -44.6739 69.5904 )
Norm@50keV : 9.94463E-03 ( -0.00289334 0.0165105 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.56 using 59 PHA bins.
# Reduced chi-squared = 1.137 for 55 degrees of freedom
# Null hypothesis probability = 2.256425e-01
Photon flux (15-150 keV) in 102.5 sec: 0.676732 ( 6.32327 -0.03275 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.22615e-06 ( -5.22543e-06 -2.58177e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 15.9764 ( )
R^2/D10^2 : 6.29616E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 160.60 using 59 PHA bins.
# Reduced chi-squared = 2.8176 for 57 degrees of freedom
# Null hypothesis probability = 8.416796e-12
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.407e-07 2.814e-08
25- 50 1.432e-06 7.739e-08
50-150 2.553e-06 1.876e-07
15-150 4.326e-06 2.060e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-22.522 -200)
Norm : 2.86500 (-0.116519 0.116519)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.313e-07 3.429e-08
25- 50 1.407e-06 6.509e-08
50-150 3.085e-06 1.445e-07
15-150 5.224e-06 2.496e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.22254 (-1.31221 1.4718)
R1^2/D10^2 : 0.567320 (-0.247426 0.559788)
kT2 [keV] : 24.4196 (-3.05572 4.7689)
R2^2/D10^2 : 1.12636E-02 (-0.00560641 0.00781842)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.239e-07 1.069e-07
25- 50 1.410e-06 1.901e-07
50-150 3.145e-06 5.801e-07
15-150 5.179e-06 6.170e-07
Peak spectrum fit
Power-law model
Time interval is from 21.620 sec. to 22.620 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.40922 ( -0.179862 0.182343 )
Norm@50keV : 2.44074E-02 ( -0.00278428 0.00277708 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.03 using 59 PHA bins.
# Reduced chi-squared = 1.211 for 57 degrees of freedom
# Null hypothesis probability = 1.319177e-01
Photon flux (15-150 keV) in 1 sec: 2.97865 ( -0.341262 0.341743 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.354e-07 ( -2.93002e-08 2.95248e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 21.620 sec. to 22.620 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.284200 ( -0.99813 0.820588 )
Epeak [keV] : 79.3342 ( -17.2488 72.6776 )
Norm@50keV : 8.66940E-02 ( -0.0515444 0.170968 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.26 using 59 PHA bins.
# Reduced chi-squared = 1.130 for 56 degrees of freedom
# Null hypothesis probability = 2.356069e-01
Photon flux (15-150 keV) in 1 sec: 2.86870 ( -0.35219 0.35177 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.22773e-07 ( -3.1282e-08 3.1521e-08 ) ergs/cm2
Band function
Time interval is from 21.620 sec. to 22.620 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.278274 ( -0.803078 3.82109 )
beta : -2.79096 ( 2.75817 4.50041 )
Epeak [keV] : 78.8317 ( -42.1296 69.1263 )
Norm@50keV : 8.73261E-02 ( -0.0301438 0.744901 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.18 using 59 PHA bins.
# Reduced chi-squared = 1.149 for 55 degrees of freedom
# Null hypothesis probability = 2.098405e-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] : 16.2660 (-1.97234 2.26342)
R^2/D10^2 : 0.274315 (-0.0996383 0.153584)
(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 1.495e-08 3.165e-09
25- 50 6.379e-08 9.745e-09
50-150 1.187e-07 2.393e-08
15-150 1.975e-07 2.850e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-53.9656 -200)
Norm : 12.3714 (-1.38748 1.38748)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.081e-08 1.702e-08
25- 50 5.926e-08 3.161e-08
50-150 1.300e-07 7.160e-08
15-150 2.200e-07 1.195e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.39853 (-3.75635 5.82221)
R1^2/D10^2 : 2.58795 (-2.10241 9.40743)
kT2 [keV] : 20.5093 (-3.97607 15.7333)
R2^2/D10^2 : 0.105296 (-0.0962189 0.12754)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.381e-08 1.305e-08
25- 50 6.035e-08 3.033e-08
50-150 1.359e-07 7.756e-08
15-150 2.201e-07 1.148e-07
Plot creation:
Mon Feb 19 22:38:47 EST 2024