batgrbproduct analysis for trigger=1222885
batgrbproduct Analysis for Trigger=1222885
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): Fri Apr 19 16:34:41 EDT 2024
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1222885/GCN5_download_cron
======================================================================
Trigger: 01222885 Segment: 000
BAT Trigger Time: 735164681.472 [s; MET]
Trigger Stop: 735164689.664 [s; MET]
UTC: 2024-04-18T20:24:08.178240 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 239.321942835305 Dec: 23.6073757940438 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.96
Image Trigger?: NO
Rate S/N Ratio: 12.6491106406735 [ if not an image trigger ]
Image S/N Ratio: 7.96
Flight Position: [ source = BAT ]
RA: 239.321942835305 Dec: 23.6073757940438 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 239.341770066143 Dec: 23.6317784264034 [deg; J2000]
{ 15h 57m 22.0s , +23d 37' 54.4" }
+/- 2.26379041775631 [arcmin] (estimated 90% radius based on SNR)
+/- 1.31819881691618 [arcmin] (formal 1-sigma fit error)
SNR: 9.46693724259533
Angular difference between Flight and Ground position is 1.825322 arcmin
Partial Coding Fraction: 0.796875 [ including projection effects ]
Duration
T90: 12 +/- 3.60555127546399
Measured from: -0.471999883651733
to: 11.5280001163483 [s; relative to TRIGTIME]
T50: 5 +/- 3.16227766016838
Measured from: 2.52800011634827
to: 7.52800011634827 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 4.52799999713898
to: 5.52799999713898 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.472000002861023
to: 12.527999997139 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.186152 0.164892 0.083159 -0.008863
0.027911 0.025741 0.021303 0.017081 [error]
Peak 0.020810 0.022128 0.019253 -0.003654
0.007980 0.007446 0.006034 0.004613 [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 5.12e-08 6.98e-08 7.02e-08 1.28e-07 2.32e-07 3.19e-07 erg/cm2
Error 1.19e-08 1.17e-08 1.99e-08 7.21e-08 4.63e-08 9.43e-08 erg/cm2
Peak flux Power-law 1.65e-01 1.54e-01 9.98e-02 1.00e-01 4.60e-01 5.19e-01 ph/cm2/s
Error 9.97e-02 6.00e-02 4.81e-02 1.15e-01 1.74e-01 1.92e-01 ph/cm2/s
Fluence Cutoff-PL 4.81e-08 7.67e-08 6.72e-08 3.58e-08 2.15e-07 2.28e-07 erg/cm2
Error 1.34e-08 1.63e-08 2.37e-08 7.40e-08 5.12e-08 1.13e-07 erg/cm2
Peak flux Cutoff-PL 1.48e-01 1.62e-01 1.05e-01 5.73e-02 4.49e-01 4.73e-01 ph/cm2/s
Error 1.15e-01 6.92e-02 5.55e-02 1.11e-01 1.79e-01 2.12e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 1.47e-01 1.62e-01 1.06e-01 5.51e-02 4.48e-01 4.69e-01 ph/cm2/s
Error -------- -------- -------- -------- 1.79e-01 -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.992 0.311 - - 1.94e-03 4.05e-04 60.710 57
CPL 1.201 1.313 41.6 0.0 5.60e-03 0.00e+00 59.630 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.625 0.676 - - 3.55e-03 1.38e-03 53.470 57
CPL 1.063 2.246 84.4 0.0 6.78e-03 1.09e-01 53.280 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 13.000 -0.472 12.528
T90 12.000 -0.472 11.528
T50 5.000 2.528 7.528
Peak 1.000 4.528 5.528
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
239.3418 +23.6318 0.0203 20.4 -109.5 0.4781 9.5 TRIG_01222885
------------------------------------------
Foreground time interval of the image:
-0.472 12.528 (delta_t = 13.000 [sec])
Background time interval of the image:
-60.472 -0.472 (delta_t = 60.000 [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 -0.472 sec. to 12.528 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.99214 ( -0.298224 0.323113 )
Norm@50keV : 1.93897E-03 ( -0.000411453 0.000397999 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.71 using 59 PHA bins.
# Reduced chi-squared = 1.065 for 57 degrees of freedom
# Null hypothesis probability = 3.437186e-01
Photon flux (15-150 keV) in 13 sec: 0.289799 ( -0.0482419 0.0482601 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.32356e-07 ( -4.55644e-08 4.70653e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.472 sec. to 12.528 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.20144 ( -1.67125 0.954539 )
Epeak [keV] : 41.6305 ( )
Norm@50keV : 5.59702E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.63 using 59 PHA bins.
# Reduced chi-squared = 1.065 for 56 degrees of freedom
# Null hypothesis probability = 3.451228e-01
Photon flux (15-150 keV) in 13 sec: 0.281901 ( -0.049721 0.049838 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.15099e-07 ( -4.81117e-08 5.42477e-08 ) ergs/cm2
Band function
Time interval is from -0.472 sec. to 12.528 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -5 -5 )
beta : -2.14978 ( -0.44117 0.359182 )
Epeak [keV] : 22.3213 ( -22.3196 5.04547 )
Norm@50keV : 678.883 ( -111.477 2.71531e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.11 using 59 PHA bins.
# Reduced chi-squared = 1.075 for 55 degrees of freedom
# Null hypothesis probability = 3.279210e-01
Photon flux (15-150 keV) in 13 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] : 10.2216 (-1.86065 2.24604)
R^2/D10^2 : 0.124980 (-0.0667228 0.144857)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.64 using 59 PHA bins.
# Reduced chi-squared = 1.152 for 57 degrees of freedom
# Null hypothesis probability = 2.023096e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.482e-08 1.173e-08
25- 50 8.927e-08 2.250e-08
50-150 4.962e-08 2.059e-08
15-150 1.737e-07 4.818e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 65.4155 (-25.1729 56.8825)
Norm : 1.46946 (-0.355179 0.477997)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.862e-08 1.062e-08
25- 50 7.591e-08 1.652e-08
50-150 9.261e-08 4.535e-08
15-150 2.171e-07 6.142e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.25873 (-1.79261 3.76403)
R1^2/D10^2 : 2.17131 (-1.90229 27.9723)
kT2 [keV] : 14.3741 (-3.85189 13.9255)
R2^2/D10^2 : 2.73379E-02 (-0.025879 0.0729039)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.997e-08 2.744e-08
25- 50 7.388e-08 3.868e-08
50-150 8.164e-08 5.054e-08
15-150 2.055e-07 1.087e-07
Peak spectrum fit
Power-law model
Time interval is from 4.528 sec. to 5.528 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.62508 ( -0.652778 0.698446 )
Norm@50keV : 3.54963E-03 ( -0.00140685 0.00135487 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.47 using 59 PHA bins.
# Reduced chi-squared = 0.9380 for 57 degrees of freedom
# Null hypothesis probability = 6.083744e-01
Photon flux (15-150 keV) in 1 sec: 0.459758 ( -0.173368 0.174576 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.30998e-08 ( -1.3315e-08 1.37547e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 4.528 sec. to 5.528 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.06342 ( -3.26656 1.22513 )
Epeak [keV] : 84.4270 ( -85.1191 -85.1191 )
Norm@50keV : 6.78207E-03 ( -0.00673057 0.210271 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.28 using 59 PHA bins.
# Reduced chi-squared = 0.9514 for 56 degrees of freedom
# Null hypothesis probability = 5.785456e-01
Photon flux (15-150 keV) in 1 sec: 0.449176 ( -0.179042 0.17907 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.21252e-08 ( -1.35324e-08 1.42602e-08 ) ergs/cm2
Band function
Time interval is from 4.528 sec. to 5.528 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.985805 ( -1.01376 3.17795 )
beta : -9.35654 ( 9.37161 19.3716 )
Epeak [keV] : 81.8850 ( -50.4715 -81.9736 )
Norm@50keV : 7.33649E-03 ( -0.0073205 0.0221466 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.28 using 59 PHA bins.
# Reduced chi-squared = 0.9688 for 55 degrees of freedom
# Null hypothesis probability = 5.405472e-01
Photon flux (15-150 keV) in 1 sec: 0.447662 ( 6.55234 -0.177455 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.20537e-08 ( 0 0 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 16.1769 (-7.11062 10.397)
R^2/D10^2 : 3.90261E-02 (-0.0389395 0.264442)
(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 2.106e-09 1.422e-09
25- 50 8.947e-09 5.825e-09
50-150 1.643e-08 1.135e-08
15-150 2.749e-08 1.762e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 158.712 (-163.218 -163.218)
Norm : 1.88335 (-0.714861 1.1778)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.672e-09 2.811e-09
25- 50 8.932e-09 5.470e-09
50-150 1.926e-08 1.164e-08
15-150 3.286e-08 2.002e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.27329 (-5.27413 -5.27413)
R1^2/D10^2 : 1.42940 (-1.42865 -1.42865)
kT2 [keV] : 22.2722 (-22.2735 -22.2735)
R2^2/D10^2 : 1.06685E-02 (-0.010666 0.0781125)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.255e-09 3.497e-09
25- 50 8.368e-09 4.527e-09
50-150 1.939e-08 1.299e-08
15-150 3.302e-08 1.819e-08
Plot creation:
Fri Apr 19 16:37:05 EDT 2024