batgrbproduct analysis for trigger=1281241
batgrbproduct Analysis for Trigger=1281241
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): Tue Jan 21 09:45:12 EST 2025
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1281241/batgroup_hand_proc
======================================================================
Trigger: 01281241 Segment: 000
BAT Trigger Time: 758532834.368 [s; MET]
Trigger Stop: 758532838.464 [s; MET]
UTC: 2025-01-14T07:33:19.475360 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 166.590269450428 Dec: -15.1431759434439 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.87
Image Trigger?: NO
Rate S/N Ratio: 9.38083151964686 [ if not an image trigger ]
Image S/N Ratio: 6.87
Flight Position: [ source = BAT ]
RA: 166.590269450428 Dec: -15.1431759434439 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 166.57326303913 Dec: -15.1259127661014 [deg; J2000]
{ 11h 06m 17.6s , -15d 07' 33.3" }
+/- 1.93962552300671 [arcmin] (estimated 90% radius based on SNR)
+/- 0.777549869128453 [arcmin] (formal 1-sigma fit error)
SNR: 11.8057293453966
Angular difference between Flight and Ground position is 1.429361 arcmin
Partial Coding Fraction: 0.2128906 [ including projection effects ]
Duration
T90: 293.999999880791 +/- 11.6913108780233
Measured from: -1.23199999332428
to: 292.767999887466 [s; relative to TRIGTIME]
T50: 247.799999952316 +/- 13.3155770081395
Measured from: 15.9839999675751
to: 263.783999919891 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.73199999332428
to: 2.73199999332428 [s; relative to TRIGTIME]
Total Fluence
Measured from: -8.52799999713898
to: 305.987999916077 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.873293 2.750325 1.617055 0.158898
0.145640 0.152613 0.129226 0.108118 [error]
Peak 0.034810 0.100065 0.033620 0.008854
0.014338 0.016588 0.013529 0.010543 [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 7.66e-07 1.14e-06 1.26e-06 2.64e-06 3.96e-06 5.80e-06 erg/cm2
Error 7.88e-08 7.82e-08 1.25e-07 5.22e-07 3.01e-07 6.49e-07 erg/cm2
Peak flux Power-law 5.05e-01 4.96e-01 3.41e-01 3.70e-01 1.49e+00 1.71e+00 ph/cm2/s
Error 2.03e-01 1.36e-01 1.02e-01 2.07e-01 3.94e-01 4.38e-01 ph/cm2/s
Fluence Cutoff-PL 6.26e-07 1.33e-06 1.29e-06 4.69e-07 3.60e-06 3.71e-06 erg/cm2
Error 9.40e-08 1.08e-07 1.52e-07 2.89e-07 3.15e-07 4.16e-07 erg/cm2
Peak flux Cutoff-PL 3.13e-01 8.69e-01 1.58e-01 2.93e-04 1.34e+00 1.34e+00 ph/cm2/s
Error 2.37e-01 3.24e-01 2.16e-01 1.10e-01 4.19e-01 4.24e-01 ph/cm2/s
Fluence Band 6.21e-07 1.32e-06 1.28e-06 5.59e-07 3.60e-06 3.79e-06 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 1.851 0.115 - - 1.37e-03 1.03e-04 66.770 57
CPL 0.342 0.628 50.4 6.0 8.82e-03 7.82e-03 43.830 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.539 0.375 - - 1.18e-02 3.05e-03 52.690 57
CPL -5.653 0.532 39.0 30.8 2.90e+02 9.29e+04 47.930 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: 288.704000 sec.
T50 in the 50-300 keV band: 182.976000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 314.516 -8.528 305.988
T90 294.000 -1.232 292.768
T50 247.800 15.984 263.784
Peak 1.000 1.732 2.732
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
166.5733 -15.1259 0.0163 41.2 39.3 2.3632 11.8 TRIG_01281241
------------------------------------------
Foreground time interval of the image:
-8.528 34.933 (delta_t = 43.461 [sec])
Background time interval of the image:
-189.467 -8.528 (delta_t = 180.939 [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 -8.528 sec. to 305.988 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.85069 ( -0.113786 0.116611 )
Norm@50keV : 1.37078E-03 ( -0.000103664 0.000102851 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.77 using 59 PHA bins.
# Reduced chi-squared = 1.171 for 57 degrees of freedom
# Null hypothesis probability = 1.764520e-01
Photon flux (15-150 keV) in 314.5 sec: 0.192731 ( -0.0134828 0.013502 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.96396e-06 ( -3.00052e-07 3.01969e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -8.528 sec. to 305.988 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.342386 ( -0.669405 0.587429 )
Epeak [keV] : 50.3747 ( -5.09982 6.92976 )
Norm@50keV : 8.82011E-03 ( -0.00449615 0.0111357 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.83 using 59 PHA bins.
# Reduced chi-squared = 0.7827 for 56 degrees of freedom
# Null hypothesis probability = 8.813132e-01
Photon flux (15-150 keV) in 314.5 sec: 0.181878 ( -0.013982 0.014021 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.6004e-06 ( -3.09814e-07 3.19563e-07 ) ergs/cm2
Band function
Time interval is from -8.528 sec. to 305.988 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.342199 ( -0.493706 0.710501 )
beta : -10.00000 ( 10 20 )
Epeak [keV] : 50.3641 ( -5.08395 6.92857 )
Norm@50keV : 8.82293E-03 ( -0.00449768 0.0111805 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.83 using 59 PHA bins.
# Reduced chi-squared = 0.7969 for 55 degrees of freedom
# Null hypothesis probability = 8.604648e-01
Photon flux (15-150 keV) in 314.5 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.6014e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.1294 (-0.841465 0.902929)
R^2/D10^2 : 4.60292E-02 (-0.0109922 0.0143526)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.02 using 59 PHA bins.
# Reduced chi-squared = 1.070 for 57 degrees of freedom
# Null hypothesis probability = 3.335985e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.508e-07 5.441e-08
25- 50 1.437e-06 1.175e-07
50-150 1.280e-06 1.863e-07
15-150 3.168e-06 2.518e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 87.3536 (-16.598 23.5122)
Norm : 0.893116 (-0.0845571 0.0956202)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.322e-07 8.114e-08
25- 50 1.230e-06 8.381e-08
50-150 1.839e-06 6.196e-07
15-150 3.801e-06 6.211e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.93324 (-2.09395 2.48725)
R1^2/D10^2 : 0.286293 (-0.181271 1.17005)
kT2 [keV] : 15.8272 (-2.36644 4.70346)
R2^2/D10^2 : 1.32985E-02 (-0.00963729 0.0147033)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.315e-07 2.864e-07
25- 50 1.308e-06 5.502e-07
50-150 1.614e-06 6.625e-07
15-150 3.554e-06 1.297e-06
Peak spectrum fit
Power-law model
Time interval is from 1.732 sec. to 2.732 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.53949 ( -0.377608 0.372064 )
Norm@50keV : 1.18058E-02 ( -0.00305193 0.00304173 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.69 using 59 PHA bins.
# Reduced chi-squared = 0.9243 for 57 degrees of freedom
# Null hypothesis probability = 6.374441e-01
Photon flux (15-150 keV) in 1 sec: 1.49021 ( -0.393123 0.39549 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.11294e-07 ( -2.98917e-08 3.0246e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.732 sec. to 2.732 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -5.65264 ( 4.26477 5.32827 )
Epeak [keV] : 39.0426 ( -7.11116 54.573 )
Norm@50keV : 290.047 ( -309.608 185565 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.93 using 59 PHA bins.
# Reduced chi-squared = 0.8559 for 56 degrees of freedom
# Null hypothesis probability = 7.698885e-01
Photon flux (15-150 keV) in 1 sec: 1.33742 ( -0.375272 0.46188 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.45869e-08 ( -2.18393e-08 5.01381e-08 ) ergs/cm2
Band function
Time interval is from 1.732 sec. to 2.732 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -3.62936 -5 )
beta : -2.68059 ( -1.96631 0.821803 )
Epeak [keV] : 37.4957 ( -7.00756 6.79444 )
Norm@50keV : 150.338 ( -34.6277 361.764 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.22 using 59 PHA bins.
# Reduced chi-squared = 0.7858 for 55 degrees of freedom
# Null hypothesis probability = 8.750038e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.04557e-07 ( -1.0455e-07 -2.90041e-08 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.9545 (-2.44516 3.68255)
R^2/D10^2 : 0.429770 (-0.276798 0.580064)
(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 1.299e-08 6.011e-09
25- 50 4.069e-08 1.882e-08
50-150 3.487e-08 1.922e-08
15-150 8.855e-08 3.553e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 169.507 (-100.254 -168.503)
Norm : 6.32331 (-1.65488 2.25744)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.605e-08 9.620e-09
25- 50 3.026e-08 1.733e-08
50-150 6.268e-08 3.802e-08
15-150 1.090e-07 6.375e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 39.2332 (-39.1553 -39.1553)
R1^2/D10^2 : 2.92035E-03 (-0.00299663 0.530562)
kT2 [keV] : 9.92821 (-9.92262 3.47653)
R2^2/D10^2 : 0.709714 (-0.710136 1.25822)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Plot creation:
Tue Jan 21 09:57:09 EST 2025