batgrbproduct analysis for trigger=1227767
batgrbproduct Analysis for Trigger=1227767
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): Sun May 12 20:30:28 EDT 2024
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1227767/GCN5_download_cron
======================================================================
Trigger: 01227767 Segment: 000
BAT Trigger Time: 737143646.656 [s; MET]
Trigger Stop: 737143648.704 [s; MET]
UTC: 2024-05-11T18:06:53.226840 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 336.664509948977 Dec: 8.51351293746527 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.52
Image Trigger?: NO
Rate S/N Ratio: 14.8996644257513 [ if not an image trigger ]
Image S/N Ratio: 8.52
Flight Position: [ source = BAT ]
RA: 336.664509948977 Dec: 8.51351293746527 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 336.668521076857 Dec: 8.51416525750696 [deg; J2000]
{ 22h 26m 40.4s , +08d 30' 51.0" }
+/- 0.689232651612834 [arcmin] (estimated 90% radius based on SNR)
+/- 0.235260275407324 [arcmin] (formal 1-sigma fit error)
SNR: 51.7635815640006
Angular difference between Flight and Ground position is 0.241212 arcmin
Partial Coding Fraction: 0.8515625 [ including projection effects ]
Duration
T90: 148.536000013351 +/- 17.0657857031545
Measured from: -44.8279999494553
to: 103.708000063896 [s; relative to TRIGTIME]
T50: 59.9880000352859 +/- 2.39597334507173
Measured from: -15.095999956131
to: 44.892000079155 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 35.1480000019073
to: 36.1480000019073 [s; relative to TRIGTIME]
Total Fluence
Measured from: -92.0119999647141
to: 203.703999996185 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 4.891166 6.502661 4.679380 1.151685
0.099978 0.104191 0.089568 0.072790 [error]
Peak 0.074694 0.123857 0.094247 0.022257
0.007559 0.008561 0.007527 0.005405 [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 1.58e-06 2.75e-06 3.63e-06 9.81e-06 1.06e-05 1.78e-05 erg/cm2
Error 7.17e-08 7.12e-08 9.62e-08 6.03e-07 2.37e-07 6.46e-07 erg/cm2
Peak flux Power-law 8.14e-01 8.49e-01 6.26e-01 7.44e-01 2.57e+00 3.03e+00 ph/cm2/s
Error 1.10e-01 7.12e-02 5.99e-02 1.45e-01 2.03e-01 2.39e-01 ph/cm2/s
Fluence Cutoff-PL 1.51e-06 2.77e-06 3.70e-06 7.63e-06 1.05e-05 1.56e-05 erg/cm2
Error 9.54e-08 7.55e-08 1.09e-07 1.56e-06 2.66e-07 1.61e-06 erg/cm2
Peak flux Cutoff-PL 7.83e-01 8.68e-01 6.40e-01 5.74e-01 2.56e+00 2.87e+00 ph/cm2/s
Error 1.27e-01 8.48e-02 6.80e-02 2.31e-01 2.06e-01 3.51e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- 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 1.596 0.042 - - 4.43e-03 9.63e-05 43.610 57
CPL 1.399 0.172 169.8 310.0 5.43e-03 9.55e-04 39.660 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.440 0.131 - - 2.09e-02 1.64e-03 60.610 57
CPL 1.220 0.423 180.2 0.0 2.71e-02 1.57e-02 60.070 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: 104.064000 sec.
T50 in the 50-300 keV band: 52.544000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 295.716 -92.012 203.704
T90 148.536 -44.828 103.708
T50 59.988 -15.096 44.892
Peak 1.000 35.148 36.148
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
336.6685 +8.5142 0.0037 28.4 -173.5 9.1261 51.8 TRIG_01227767
------------------------------------------
Foreground time interval of the image:
-92.012 -13.852 (delta_t = 78.160 [sec])
-12.656 -12.426 (delta_t = 0.230 [sec])
-11.656 -11.546 (delta_t = 0.110 [sec])
-10.656 8.174 (delta_t = 18.830 [sec])
21.344 24.845 (delta_t = 3.501 [sec])
Background time interval of the image:
-239.656 -92.012 (delta_t = 147.644 [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
Multiple GTIs in the spectrum
tstart tstop
-92.012000 -13.851700
-12.656000 -12.426000
-11.656000 -11.546000
-10.656000 8.174000
21.344000 155.994000
157.344000 157.454000
158.344000 158.584000
159.344000 159.924000
180.344000 203.704000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.59564 ( -0.0420692 0.0420757 )
Norm@50keV : 4.42626E-03 ( -9.63136e-05 9.63134e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.61 using 59 PHA bins.
# Reduced chi-squared = 0.7650 for 57 degrees of freedom
# Null hypothesis probability = 9.040727e-01
Photon flux (15-150 keV) in 256.3 sec: 0.568029 ( -0.0144063 0.0144649 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.06152e-05 ( -2.36955e-07 2.371e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-92.012000 -13.851700
-12.656000 -12.426000
-11.656000 -11.546000
-10.656000 8.174000
21.344000 155.994000
157.344000 157.454000
158.344000 158.584000
159.344000 159.924000
180.344000 203.704000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.39912 ( -0.17524 0.168819 )
Epeak [keV] : 169.839 ( -54.4109 565.637 )
Norm@50keV : 5.42831E-03 ( -0.000853094 0.00105614 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.66 using 59 PHA bins.
# Reduced chi-squared = 0.7082 for 56 degrees of freedom
# Null hypothesis probability = 9.517335e-01
Photon flux (15-150 keV) in 256.3 sec: 0.558462 ( -0.016309 0.016416 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.04804e-05 ( -2.66373e-07 2.65014e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-92.012000 -13.851700
-12.656000 -12.426000
-11.656000 -11.546000
-10.656000 8.174000
21.344000 155.994000
157.344000 157.454000
158.344000 158.584000
159.344000 159.924000
180.344000 203.704000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.953042 ( -0.473671 0.809742 )
beta : -1.68382 ( -0.108074 0.0741465 )
Epeak [keV] : 67.4725 ( -24.1815 102.287 )
Norm@50keV : 9.92953E-03 ( -0.00464202 0.0239559 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.71 using 59 PHA bins.
# Reduced chi-squared = 0.6675 for 55 degrees of freedom
# Null hypothesis probability = 9.726140e-01
Photon flux (15-150 keV) in 256.3 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 16.2393 ( )
R^2/D10^2 : 4.53841E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 463.83 using 59 PHA bins.
# Reduced chi-squared = 8.1373 for 57 degrees of freedom
# Null hypothesis probability = 4.204741e-65
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.321e-07 2.973e-08
25- 50 2.694e-06 7.945e-08
50-150 4.993e-06 1.961e-07
15-150 8.318e-06 2.063e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-20.9455 -200)
Norm : 2.27391 (-0.049468 0.049468)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.452e-06 3.857e-08
25- 50 2.793e-06 7.561e-08
50-150 6.124e-06 1.576e-07
15-150 1.037e-05 2.781e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.23912 (-0.643946 0.66396)
R1^2/D10^2 : 0.341189 (-0.0761844 0.107124)
kT2 [keV] : 30.1163 (-2.75524 3.57805)
R2^2/D10^2 : 3.92312E-03 (-0.00127869 0.00165135)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.239e-06 1.010e-07
25- 50 2.897e-06 1.230e-07
50-150 6.209e-06 4.370e-07
15-150 1.034e-05 5.229e-07
Peak spectrum fit
Power-law model
Time interval is from 35.148 sec. to 36.148 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.43995 ( -0.130279 0.130918 )
Norm@50keV : 2.09452E-02 ( -0.00164121 0.00163708 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.61 using 59 PHA bins.
# Reduced chi-squared = 1.063 for 57 degrees of freedom
# Null hypothesis probability = 3.468941e-01
Photon flux (15-150 keV) in 1 sec: 2.57482 ( -0.203177 0.203371 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.00806e-07 ( -1.72437e-08 1.7331e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 35.148 sec. to 36.148 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.22004 ( -0.55536 0.290917 )
Epeak [keV] : 180.194 ( -180.221 -180.221 )
Norm@50keV : 2.70687E-02 ( -0.00751796 0.0238743 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.07 using 59 PHA bins.
# Reduced chi-squared = 1.073 for 56 degrees of freedom
# Null hypothesis probability = 3.306540e-01
Photon flux (15-150 keV) in 1 sec: 2.55653 ( -0.20397 0.2074 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.98179e-07 ( -1.8623e-08 1.8421e-08 ) ergs/cm2
Band function
Time interval is from 35.148 sec. to 36.148 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.457815 ( 0.186691 0.186691 )
beta : -1.57027 ( 1.5578 0.186779 )
Epeak [keV] : 40.4653 ( -40.5312 94.4293 )
Norm@50keV : 0.374969 ( -0.393852 420.394 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.24 using 59 PHA bins.
# Reduced chi-squared = 1.059 for 55 degrees of freedom
# Null hypothesis probability = 3.570730e-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] : 15.2750 (-1.48708 1.67955)
R^2/D10^2 : 0.280381 (-0.0860048 0.121041)
(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 1.365e-08 2.035e-09
25- 50 5.516e-08 5.555e-09
50-150 8.828e-08 1.162e-08
15-150 1.571e-07 1.510e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-35.8284 -200)
Norm : 10.6340 (-0.819798 0.819799)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.648e-08 2.500e-09
25- 50 5.093e-08 5.740e-09
50-150 1.117e-07 3.606e-08
15-150 1.891e-07 4.325e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.56443 (-2.04883 2.34573)
R1^2/D10^2 : 1.45045 (-0.727921 1.72145)
kT2 [keV] : 34.9313 (-10.9791 52.5065)
R2^2/D10^2 : 1.23109E-02 (-0.0109588 0.0318596)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.227e-08 5.440e-09
25- 50 5.347e-08 1.407e-08
50-150 1.242e-07 5.610e-08
15-150 1.999e-07 6.710e-08
Plot creation:
Sun May 12 20:33:37 EDT 2024