batgrbproduct analysis for trigger=1270788
batgrbproduct Analysis for Trigger=1270788
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 Nov 29 19:51:17 EST 2024
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1270788/batgroup_hand_proc
======================================================================
Trigger: 01270788 Segment: 000
BAT Trigger Time: 754436630.848 [s; MET]
Trigger Stop: 754436631.872 [s; MET]
UTC: 2024-11-27T21:43:16.235160 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 327.922202326549 Dec: -56.6853428664162 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 12.63
Image Trigger?: NO
Rate S/N Ratio: 12.0415945787923 [ if not an image trigger ]
Image S/N Ratio: 12.63
Flight Position: [ source = BAT ]
RA: 327.922202326549 Dec: -56.6853428664162 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 327.910584489106 Dec: -56.6522630984451 [deg; J2000]
{ 21h 51m 38.5s , -56d 39' 08.1" }
+/- 1.66860326164609 [arcmin] (estimated 90% radius based on SNR)
+/- 0.695334741286271 [arcmin] (formal 1-sigma fit error)
SNR: 14.6376416620161
Angular difference between Flight and Ground position is 2.021406 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 26.0159999132156 +/- 3.62606123888008
Measured from: -19.4400000572205
to: 6.57599985599518 [s; relative to TRIGTIME]
T50: 13.3239998817444 +/- 4.5827869131154
Measured from: -11.7680000066757
to: 1.55599987506866 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.0920000076293945
to: 1.09200000762939 [s; relative to TRIGTIME]
Total Fluence
Measured from: -20.8320000171661
to: 9.12799990177155 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.881719 0.686421 0.107502 0.011682
0.046756 0.052859 0.050121 0.044334 [error]
Peak 0.107747 0.110023 0.053799 0.014853
0.009365 0.010321 0.009512 0.007855 [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 2.71e-07 2.50e-07 1.60e-07 1.57e-07 7.46e-07 8.38e-07 erg/cm2
Error 2.82e-08 2.67e-08 3.60e-08 6.47e-08 8.37e-08 1.20e-07 erg/cm2
Peak flux Power-law 1.05e+00 7.73e-01 3.80e-01 2.65e-01 2.32e+00 2.47e+00 ph/cm2/s
Error 1.43e-01 8.17e-02 7.28e-02 9.40e-02 2.39e-01 2.64e-01 ph/cm2/s
Fluence Cutoff-PL 2.59e-07 2.80e-07 1.05e-07 1.02e-08 6.53e-07 6.54e-07 erg/cm2
Error 3.07e-08 3.42e-08 4.76e-08 2.72e-08 8.27e-08 8.77e-08 erg/cm2
Peak flux Cutoff-PL 1.01e+00 8.41e-01 3.47e-01 8.19e-02 2.26e+00 2.28e+00 ph/cm2/s
Error 1.51e-01 1.15e-01 1.01e-01 1.53e-01 2.43e-01 2.85e-01 ph/cm2/s
Fluence Band 2.56e-07 2.79e-07 1.05e-07 1.02e-08 6.51e-07 6.52e-07 erg/cm2
Error -------- 3.41e-08 -------- -------- 8.20e-08 -------- erg/cm2
Peak flux Band 1.01e+00 8.69e-01 3.21e-01 1.57e-01 2.28e+00 2.36e+00 ph/cm2/s
Error 1.65e-01 1.14e-01 6.53e-02 -------- 2.43e-01 2.69e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.648 0.210 - - 2.38e-03 3.93e-04 60.150 57
CPL 1.102 1.011 19.0 0.0 2.50e-02 0.00e+00 52.960 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.026 0.199 - - 1.53e-02 2.21e-03 65.990 57
CPL 1.302 1.003 35.3 0.0 4.37e-02 0.00e+00 63.820 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: 1.024000 sec.
T50 in the 50-300 keV band: 0.576000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 29.960 -20.832 9.128
T90 26.016 -19.440 6.576
T50 13.324 -11.768 1.556
Peak 1.000 0.092 1.092
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
327.9106 -56.6523 0.0132 11.8 -178.1 1.7641 14.6 TRIG_01270788
------------------------------------------
Foreground time interval of the image:
-20.832 9.128 (delta_t = 29.960 [sec])
Background time interval of the image:
-60.848 -20.832 (delta_t = 40.016 [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 -20.832 sec. to 9.128 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.64806 ( -0.201826 0.218259 )
Norm@50keV : 2.38277E-03 ( -0.000390378 0.000396591 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.15 using 59 PHA bins.
# Reduced chi-squared = 1.055 for 57 degrees of freedom
# Null hypothesis probability = 3.624134e-01
Photon flux (15-150 keV) in 29.96 sec: 0.513967 ( -0.043893 0.043905 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.46175e-07 ( -8.19026e-08 8.55661e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -20.832 sec. to 9.128 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.10216 ( -1.27892 0.743129 )
Epeak [keV] : 18.9801 ( )
Norm@50keV : 2.49653E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.96 using 59 PHA bins.
# Reduced chi-squared = 0.9458 for 56 degrees of freedom
# Null hypothesis probability = 5.905192e-01
Photon flux (15-150 keV) in 29.96 sec: 0.490649 ( -0.044569 0.045063 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.52804e-07 ( -7.61194e-08 8.93317e-08 ) ergs/cm2
Band function
Time interval is from -20.832 sec. to 9.128 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.13216 ( -1.00753 0.624339 )
beta : -9.37167 ( 9.37167 19.3716 )
Epeak [keV] : 18.7763 ( -8.81194 7.13983 )
Norm@50keV : 2.37497E-02 ( -0.0237573 0.161549 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.97 using 59 PHA bins.
# Reduced chi-squared = 0.9630 for 55 degrees of freedom
# Null hypothesis probability = 5.526808e-01
Photon flux (15-150 keV) in 29.96 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 6.51151e-07 ( -6.50941e-07 -7.48101e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 6.72451 (-0.643462 0.696906)
R^2/D10^2 : 1.12008 (-0.37979 0.599929)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.26 using 59 PHA bins.
# Reduced chi-squared = 1.110 for 57 degrees of freedom
# Null hypothesis probability = 2.649043e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.334e-07 3.138e-08
25- 50 2.953e-07 3.949e-08
50-150 4.223e-08 1.492e-08
15-150 5.709e-07 6.666e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 26.1672 (-4.85615 6.30937)
Norm : 4.62966 (-0.862149 1.13404)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.614e-07 2.746e-08
25- 50 2.758e-07 3.381e-08
50-150 1.253e-07 4.770e-08
15-150 6.625e-07 7.879e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.53612 (-1.43434 1.55178)
R1^2/D10^2 : 10.3157 (-7.81956 165.055)
kT2 [keV] : 9.21769 (-1.80284 3.44422)
R2^2/D10^2 : 0.221599 (-0.180839 0.428897)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.608e-07 1.331e-07
25- 50 2.826e-07 1.464e-07
50-150 1.008e-07 6.112e-08
15-150 6.442e-07 3.257e-07
Peak spectrum fit
Power-law model
Time interval is from 0.092 sec. to 1.092 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.02557 ( -0.192744 0.205316 )
Norm@50keV : 1.53150E-02 ( -0.00223393 0.00219507 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.99 using 59 PHA bins.
# Reduced chi-squared = 1.158 for 57 degrees of freedom
# Null hypothesis probability = 1.941143e-01
Photon flux (15-150 keV) in 1 sec: 2.32468 ( -0.239083 0.239152 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.41444e-07 ( -1.88807e-08 1.95503e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.092 sec. to 1.092 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.30224 ( -1.17537 0.830445 )
Epeak [keV] : 35.3389 ( )
Norm@50keV : 4.36592E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.82 using 59 PHA bins.
# Reduced chi-squared = 1.140 for 56 degrees of freedom
# Null hypothesis probability = 2.207223e-01
Photon flux (15-150 keV) in 1 sec: 2.26421 ( -0.24719 0.23966 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.27435e-07 ( -2.2788e-08 2.5057e-08 ) ergs/cm2
Band function
Time interval is from 0.092 sec. to 1.092 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.64000 ( -5.21129 -4.64 )
beta : -2.42895 ( -0.399509 0.312118 )
Epeak [keV] : 24.7847 ( -3.06872 2.92646 )
Norm@50keV : 1576.68 ( -159.144 7957.03 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.26 using 59 PHA bins.
# Reduced chi-squared = 1.059 for 55 degrees of freedom
# Null hypothesis probability = 3.562509e-01
Photon flux (15-150 keV) in 1 sec: 2.28436 ( 4.71564 -0.24196 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.305e-07 ( -1.30493e-07 -1.9765e-08 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.04994 (-0.905543 1.05662)
R^2/D10^2 : 2.50090 (-0.954438 1.49541)
(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 2.944e-08 4.885e-09
25- 50 5.208e-08 6.855e-09
50-150 1.396e-08 4.987e-09
15-150 9.548e-08 1.331e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 55.6747 (-15.4991 25.0117)
Norm : 12.6512 (-2.09683 2.53647)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.138e-08 4.190e-09
25- 50 4.664e-08 5.720e-09
50-150 4.979e-08 1.494e-08
15-150 1.278e-07 1.995e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.18811 (-1.11486 1.19788)
R1^2/D10^2 : 5.65545 (-2.38672 4.91524)
kT2 [keV] : 23.0897 (-8.89987 25.7399)
R2^2/D10^2 : 2.39221E-02 (-0.017746 0.0867838)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.235e-08 1.536e-08
25- 50 4.456e-08 1.841e-08
50-150 5.327e-08 3.174e-08
15-150 1.302e-07 5.815e-08
Plot creation:
Fri Nov 29 19:57:55 EST 2024