batgrbproduct analysis for trigger=1290305
batgrbproduct Analysis for Trigger=1290305
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 24 16:43:17 EST 2025
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1290305/batgroup_hand_proc
======================================================================
Trigger: 01290305 Segment: 000
BAT Trigger Time: 761801712.192 [s; MET]
Trigger Stop: 761801714.24 [s; MET]
UTC: 2025-02-21T03:34:37.076040 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 59.4766170518887 Dec: -15.1387040573162 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.54
Image Trigger?: NO
Rate S/N Ratio: 22.7156333832011 [ if not an image trigger ]
Image S/N Ratio: 10.54
Flight Position: [ source = BAT ]
RA: 59.4766170518887 Dec: -15.1387040573162 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 59.4764737284256 Dec: -15.1366072250949 [deg; J2000]
{ 03h 57m 54.4s , -15d 08' 11.8" }
+/- 1.90066163546569 [arcmin] (estimated 90% radius based on SNR)
+/- 0.820259321477584 [arcmin] (formal 1-sigma fit error)
SNR: 12.152984361924
Angular difference between Flight and Ground position is 0.126083 arcmin
Partial Coding Fraction: 0.1972656 [ including projection effects ]
Duration
T90: 1.79999995231628 +/- 0.32323363806906
Measured from: -0.136000037193298
to: 1.66399991512299 [s; relative to TRIGTIME]
T50: 0.879999995231628 +/- 0.234776417879915
Measured from: 0.339999914169312
to: 1.21999990940094 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.424000024795532
to: 1.42400002479553 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.220000028610229
to: 1.84399998188019 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.141009 0.200276 0.199731 0.044088
0.024022 0.027147 0.024431 0.020063 [error]
Peak 0.080319 0.109494 0.141456 0.018507
0.016971 0.019603 0.018072 0.013865 [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 4.87e-08 9.35e-08 1.39e-07 4.44e-07 3.92e-07 7.25e-07 erg/cm2
Error 1.14e-08 1.34e-08 2.35e-08 1.63e-07 5.79e-08 1.80e-07 erg/cm2
Peak flux Power-law 8.59e-01 9.32e-01 7.20e-01 9.12e-01 2.85e+00 3.42e+00 ph/cm2/s
Error 2.47e-01 1.71e-01 1.41e-01 3.57e-01 4.86e-01 5.78e-01 ph/cm2/s
Fluence Cutoff-PL 4.64e-08 9.61e-08 1.42e-07 3.04e-07 3.86e-07 5.89e-07 erg/cm2
Error 1.36e-08 1.60e-08 2.65e-08 2.46e-07 6.13e-08 2.64e-07 erg/cm2
Peak flux Cutoff-PL 6.02e-01 9.96e-01 8.47e-01 3.69e-01 2.70e+00 2.81e+00 ph/cm2/s
Error 3.25e-01 2.05e-01 1.91e-01 3.44e-01 5.14e-01 6.27e-01 ph/cm2/s
Fluence Band 4.56e-08 9.62e-08 1.42e-07 3.46e-07 3.85e-07 6.29e-07 erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 6.59e-01 9.78e-01 8.22e-01 4.87e-01 2.76e+00 2.96e+00 ph/cm2/s
Error -------- 1.99e-01 -------- -------- -------- -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.429 0.231 - - 1.98e-02 2.66e-03 54.210 57
CPL 1.164 0.769 165.2 0.0 2.67e-02 3.31e-02 53.960 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.373 0.268 - - 2.36e-02 3.92e-03 65.360 57
CPL 0.022 1.482 83.9 108.6 9.44e-02 2.31e-01 61.730 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: 2.304000 sec.
T50 in the 50-300 keV band: 1.152000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 2.064 -0.220 1.844
T90 1.800 -0.136 1.664
T50 0.880 0.340 1.220
Peak 1.000 0.424 1.424
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
59.4765 -15.1366 0.0158 40.2 -59.6 0.6159 12.2 TRIG_01290305
------------------------------------------
Foreground time interval of the image:
-0.220 1.844 (delta_t = 2.064 [sec])
Background time interval of the image:
-194.491 -0.220 (delta_t = 194.271 [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 -0.220 sec. to 1.844 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.42949 ( -0.230198 0.231518 )
Norm@50keV : 1.97527E-02 ( -0.00266548 0.00265662 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.21 using 59 PHA bins.
# Reduced chi-squared = 0.9511 for 57 degrees of freedom
# Null hypothesis probability = 5.803466e-01
Photon flux (15-150 keV) in 2.064 sec: 2.42211 ( -0.332553 0.333276 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.91644e-07 ( -5.76455e-08 5.81251e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.220 sec. to 1.844 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.16385 ( -1.05293 0.48457 )
Epeak [keV] : 165.238 ( -165.236 -165.236 )
Norm@50keV : 2.66532E-02 ( -0.00936504 0.0567782 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.96 using 59 PHA bins.
# Reduced chi-squared = 0.9637 for 56 degrees of freedom
# Null hypothesis probability = 5.522854e-01
Photon flux (15-150 keV) in 2.064 sec: 2.39717 ( -0.34456 0.34327 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.86168e-07 ( -6.14804e-08 6.10965e-08 ) ergs/cm2
Band function
Time interval is from -0.220 sec. to 1.844 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.03548 ( 1.07542 5.27389 )
beta : -1.82168 ( 1.7552 0.543592 )
Epeak [keV] : 126.493 ( -133.448 -133.448 )
Norm@50keV : 3.08905E-02 ( -0.00999823 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.94 using 59 PHA bins.
# Reduced chi-squared = 0.9808 for 55 degrees of freedom
# Null hypothesis probability = 5.149747e-01
Photon flux (15-150 keV) in 2.064 sec: 0.0 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.84661e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 16.8427 (-2.59654 3.1454)
R^2/D10^2 : 0.188802 (-0.0848393 0.14896)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.70 using 59 PHA bins.
# Reduced chi-squared = 1.153 for 57 degrees of freedom
# Null hypothesis probability = 2.008881e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.257e-08 6.388e-09
25- 50 9.912e-08 2.249e-08
50-150 2.002e-07 4.819e-08
15-150 3.219e-07 6.151e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-66.5617 -200)
Norm : 10.0170 (-1.33676 1.33676)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.149e-08 2.935e-08
25- 50 9.905e-08 5.485e-08
50-150 2.172e-07 1.218e-07
15-150 3.678e-07 2.062e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.99793 (-2.18677 3.71792)
R1^2/D10^2 : 7.39009 (-6.37353 109.507)
kT2 [keV] : 22.1432 (-4.68757 10.5564)
R2^2/D10^2 : 6.47858E-02 (-0.0492357 0.0578907)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.913e-08 2.713e-08
25- 50 8.838e-08 4.175e-08
50-150 2.363e-07 1.241e-07
15-150 3.738e-07 1.739e-07
Peak spectrum fit
Power-law model
Time interval is from 0.424 sec. to 1.424 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.37252 ( -0.266071 0.270593 )
Norm@50keV : 2.35814E-02 ( -0.0039185 0.00391273 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.36 using 59 PHA bins.
# Reduced chi-squared = 1.147 for 57 degrees of freedom
# Null hypothesis probability = 2.092509e-01
Photon flux (15-150 keV) in 1 sec: 2.85430 ( -0.48473 0.486428 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.29177e-07 ( -4.12107e-08 4.15606e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.424 sec. to 1.424 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.19825E-02 ( -1.74002 1.22392 )
Epeak [keV] : 83.8759 ( -19.9168 197.246 )
Norm@50keV : 9.44038E-02 ( -0.0946819 0.368243 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.73 using 59 PHA bins.
# Reduced chi-squared = 1.102 for 56 degrees of freedom
# Null hypothesis probability = 2.788526e-01
Photon flux (15-150 keV) in 1 sec: 2.70233 ( -0.51708 0.51076 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.2166e-07 ( -4.1591e-08 4.2443e-08 ) ergs/cm2
Band function
Time interval is from 0.424 sec. to 1.424 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -2.07195E-02 ( -1.09731 2.10595 )
beta : -10.0000 ( 10 1.77636e-15 )
Epeak [keV] : 83.4907 ( -19.6773 166.613 )
Norm@50keV : 9.51410E-02 ( -0.0949565 0.368887 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.73 using 59 PHA bins.
# Reduced chi-squared = 1.122 for 55 degrees of freedom
# Null hypothesis probability = 2.482372e-01
Photon flux (15-150 keV) in 1 sec: 2.76300 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.31175e-07 ( -2.31168e-07 -2.7936e-08 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 18.7504 (-2.91914 3.54812)
R^2/D10^2 : 0.166715 (-0.0750162 0.129689)
(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 1.157e-08 3.574e-09
25- 50 5.516e-08 1.305e-08
50-150 1.421e-07 3.953e-08
15-150 2.089e-07 5.020e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-70.9061 -200)
Norm : 11.9183 (-1.97086 1.97086)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.968e-08 1.684e-08
25- 50 5.709e-08 3.226e-08
50-150 1.252e-07 7.210e-08
15-150 2.120e-07 1.185e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.48078 (-2.68805 3.563)
R1^2/D10^2 : 36.5623 (-35.2405 7.75091e+07)
kT2 [keV] : 20.7327 (-3.56655 4.94999)
R2^2/D10^2 : 0.111542 (-0.0599386 0.103828)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.536e-08 1.262e-08
25- 50 5.031e-08 2.039e-08
50-150 1.486e-07 5.959e-08
15-150 2.243e-07 7.909e-08
Plot creation:
Tue Feb 25 08:52:40 EST 2025