batgrbproduct analysis for trigger=1277277
batgrbproduct Analysis for Trigger=1277277
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 28 20:17:39 EST 2024
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1277277/batgroup_hand_proc
======================================================================
Trigger: 01277277 Segment: 000
BAT Trigger Time: 757051069.952 [s; MET]
Trigger Stop: 757051070.464 [s; MET]
UTC: 2024-12-28T03:57:15.160580 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 344.824008424848 Dec: 18.6040815474546 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 20.9
Image Trigger?: NO
Rate S/N Ratio: 97.1699542039616 [ if not an image trigger ]
Image S/N Ratio: 20.9
Flight Position: [ source = BAT ]
RA: 344.824008424848 Dec: 18.6040815474546 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 344.810117492842 Dec: 18.6079526906165 [deg; J2000]
{ 22h 59m 14.4s , +18d 36' 28.6" }
+/- 0.761828466267425 [arcmin] (estimated 90% radius based on SNR)
+/- 0.276427577147521 [arcmin] (formal 1-sigma fit error)
SNR: 44.8635683825315
Angular difference between Flight and Ground position is 0.823337 arcmin
Partial Coding Fraction: 0.390625 [ including projection effects ]
Duration
T90: 8.05599999427795 +/- 0.534658750758867
Measured from: -4.3400000333786
to: 3.71599996089935 [s; relative to TRIGTIME]
T50: 2.55199992656708 +/- 0.0665732703150054
Measured from: 0.103999972343445
to: 2.65599989891052 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.94400000572205
to: 2.94400000572205 [s; relative to TRIGTIME]
Total Fluence
Measured from: -5.1599999666214
to: 4.71200001239777 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.447660 2.233363 1.295337 0.213364
0.042411 0.048139 0.039382 0.025355 [error]
Peak 0.367713 0.696973 0.463132 0.065062
0.018638 0.023109 0.019299 0.009995 [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 5.81e-07 8.89e-07 1.02e-06 2.25e-06 3.16e-06 4.74e-06 erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Power-law 4.75e+00 4.52e+00 2.99e+00 3.08e+00 1.35e+01 1.53e+01 ph/cm2/s
Error -------- -------- -------- -------- -------- -------- ph/cm2/s
Fluence Cutoff-PL 4.94e-07 9.63e-07 1.07e-06 7.83e-07 2.99e-06 3.31e-06 erg/cm2
Error 3.54e-08 3.43e-08 4.51e-08 1.93e-07 1.07e-07 2.16e-07 erg/cm2
Peak flux Cutoff-PL 3.73e+00 5.23e+00 3.43e+00 9.67e-01 1.31e+01 1.34e+01 ph/cm2/s
Error 3.69e-01 2.63e-01 1.91e-01 2.36e-01 5.90e-01 6.28e-01 ph/cm2/s
Fluence Band 4.52e-07 1.00e-06 1.01e-06 1.55e-06 3.01e-06 4.02e-06 erg/cm2
Error 4.17e-08 3.96e-08 4.47e-08 2.52e-07 1.03e-07 2.69e-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 1.800 0.000 - - 3.48e-02 0.00e+00 129.770 57
CPL 0.905 0.244 61.0 5.2 9.76e-02 2.76e-02 82.230 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.596 0.000 - - 1.05e-01 0.00e+00 131.370 57
CPL 0.161 0.331 64.2 5.1 5.66e-01 2.23e-01 58.300 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: 7.552000 sec.
T50 in the 50-300 keV band: 2.368000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 9.872 -5.160 4.712
T90 8.056 -4.340 3.716
T50 2.552 0.104 2.656
Peak 1.000 1.944 2.944
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
344.8101 +18.6080 0.0043 32.4 -114.5 5.4946 44.9 TRIG_01277277
------------------------------------------
Foreground time interval of the image:
-5.160 4.712 (delta_t = 9.872 [sec])
Background time interval of the image:
-64.051 -5.160 (delta_t = 58.891 [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 -5.160 sec. to 4.712 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.79960 ( )
Norm@50keV : 3.47558E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 129.77 using 59 PHA bins.
# Reduced chi-squared = 2.2767 for 57 degrees of freedom
# Null hypothesis probability = 1.340394e-07
Photon flux (15-150 keV) in 9.872 sec: 4.78855 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.15872e-06 ( 0 0 ) ergs/cm2
Cutoff power-law model
Time interval is from -5.160 sec. to 4.712 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.904818 ( -0.250938 0.237509 )
Epeak [keV] : 61.0092 ( -4.39857 6.00426 )
Norm@50keV : 9.76478E-02 ( -0.023001 0.0322435 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 82.23 using 59 PHA bins.
# Reduced chi-squared = 1.468 for 56 degrees of freedom
# Null hypothesis probability = 1.278844e-02
Photon flux (15-150 keV) in 9.872 sec: 4.55586 ( -0.16242 0.16304 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.99011e-06 ( -1.06627e-07 1.06677e-07 ) ergs/cm2
Band function
Time interval is from -5.160 sec. to 4.712 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 7.00150E-03 ( -0.771435 1.73813 )
beta : -2.18544 ( -0.184033 0.142333 )
Epeak [keV] : 45.1771 ( -7.16967 8.36492 )
Norm@50keV : 0.359982 ( -0.329622 5.41122 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.13 using 59 PHA bins.
# Reduced chi-squared = 1.348 for 55 degrees of freedom
# Null hypothesis probability = 4.367885e-02
Photon flux (15-150 keV) in 9.872 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.00677e-06 ( -3.00671e-06 -1.02698e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.2221 ( )
R^2/D10^2 : 0.804016 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 245.32 using 59 PHA bins.
# Reduced chi-squared = 4.3039 for 57 degrees of freedom
# Null hypothesis probability = 3.300995e-25
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.942e-07 1.673e-08
25- 50 1.032e-06 3.653e-08
50-150 1.152e-06 6.713e-08
15-150 2.477e-06 7.799e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 110.444 (-13.2723 11.7583)
Norm : 20.4749 (-0.807572 1.0821)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.278e-07 3.426e-08
25- 50 9.303e-07 4.156e-08
50-150 1.592e-06 3.643e-07
15-150 3.050e-06 3.880e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.05007 (-0.815905 0.839172)
R1^2/D10^2 : 3.34388 (-0.851619 1.28892)
kT2 [keV] : 23.9313 (-2.86219 4.1661)
R2^2/D10^2 : 5.68971E-02 (-0.02747 0.0414393)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.458e-07 4.324e-08
25- 50 1.004e-06 7.251e-08
50-150 1.537e-06 2.172e-07
15-150 2.987e-06 2.976e-07
Peak spectrum fit
Power-law model
Time interval is from 1.944 sec. to 2.944 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.59575 ( )
Norm@50keV : 0.105379 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 131.37 using 59 PHA bins.
# Reduced chi-squared = 2.3047 for 57 degrees of freedom
# Null hypothesis probability = 8.383840e-08
Photon flux (15-150 keV) in 1 sec: 13.5240 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 9.86039e-07 ( 0 0 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.944 sec. to 2.944 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.161398 ( -0.342746 0.319063 )
Epeak [keV] : 64.2392 ( -4.48511 5.78566 )
Norm@50keV : 0.566177 ( -0.173362 0.273463 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.30 using 59 PHA bins.
# Reduced chi-squared = 1.041 for 56 degrees of freedom
# Null hypothesis probability = 3.906940e-01
Photon flux (15-150 keV) in 1 sec: 13.1348 ( -0.5894 0.59 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.38395e-07 ( -4.5631e-08 4.5822e-08 ) ergs/cm2
Band function
Time interval is from 1.944 sec. to 2.944 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.161266 ( -0.187844 0.250404 )
beta : -10.00000 ( 10 1.99628e-05 )
Epeak [keV] : 64.2260 ( -3.80665 4.12018 )
Norm@50keV : 0.566324 ( -0.0230283 0.274013 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.30 using 59 PHA bins.
# Reduced chi-squared = 1.060 for 55 degrees of freedom
# Null hypothesis probability = 3.549662e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 9.49505e-07 ( -9.49498e-07 -4.5281e-08 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.4016 (-0.620407 0.648312)
R^2/D10^2 : 1.90197 (-0.284318 0.33192)
(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 8.307e-08 6.425e-09
25- 50 3.176e-07 1.495e-08
50-150 4.400e-07 3.555e-08
15-150 8.407e-07 3.590e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 163.268 (-27.5007 32.1697)
Norm : 56.8936 (-2.59319 2.92115)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.450e-07 9.900e-09
25- 50 2.720e-07 1.955e-08
50-150 5.553e-07 1.453e-07
15-150 9.723e-07 1.612e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.95613 (-1.53034 1.66904)
R1^2/D10^2 : 5.91911 (-1.93567 3.50861)
kT2 [keV] : 22.7948 (-3.48958 7.30959)
R2^2/D10^2 : 0.226842 (-0.160452 0.26365)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.137e-07 1.672e-08
25- 50 3.103e-07 4.520e-08
50-150 5.227e-07 1.743e-07
15-150 9.466e-07 2.088e-07
Plot creation:
Sat Dec 28 20:24:38 EST 2024