batgrbproduct Analysis for Trigger=661253
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 10 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time (local time): Sat Oct 24 13:00:20 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger661253/GCN5_download_cron
======================================================================
Trigger: 00661253 Segment: 000
BAT Trigger Time: 467300600.128 [s; MET]
Trigger Stop: 467300601.152 [s; MET]
UTC: 2015-10-23T13:43:04.815600 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 271.019585617029 Dec: -8.3228306705058 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.49
Image Trigger?: NO
Rate S/N Ratio: 16.7332005306815 [ if not an image trigger ]
Image S/N Ratio: 8.49
Flight Position: [ source = BAT ]
RA: 271.019585617029 Dec: -8.3228306705058 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 271.012278705235 Dec: -8.28879895048902 [deg; J2000]
{ 18h 04m 02.9s , -08d 17' 19.7" }
+/- 1.81493199384027 [arcmin] (estimated 90% radius based on SNR)
+/- 0.852435058241283 [arcmin] (formal 1-sigma fit error)
SNR: 12.9812905558254
Angular difference between Flight and Ground position is 2.087478 arcmin
Partial Coding Fraction: 0.8359375 [ including projection effects ]
Duration
T90: 10.6559999585152 +/- 4.40692729039692
Measured from: -0.404000043869019
to: 10.2519999146461 [s; relative to TRIGTIME]
T50: 3.19999998807907 +/- 1.20122601752342
Measured from: 0.535999953746796
to: 3.73599994182587 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.0279999971389771
to: 0.972000002861023 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.65200001001358
to: 12.1639999747276 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.209851 0.226157 0.080771 0.010075
0.023597 0.021359 0.017582 0.015086 [error]
Peak 0.052157 0.048389 0.024813 0.004966
0.007118 0.006528 0.005317 0.004284 [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 6.97e-08 8.20e-08 6.95e-08 9.99e-08 2.57e-07 3.21e-07 erg/cm2
Error 1.11e-08 9.98e-09 1.59e-08 4.43e-08 3.64e-08 6.39e-08 erg/cm2
Peak flux Power-law 4.88e-01 3.59e-01 1.75e-01 1.21e-01 1.08e+00 1.14e+00 ph/cm2/s
Error 1.05e-01 5.23e-02 4.41e-02 5.91e-02 1.58e-01 1.67e-01 ph/cm2/s
Fluence Cutoff-PL 6.54e-08 9.06e-08 6.21e-08 2.09e-08 2.34e-07 2.39e-07 erg/cm2
Error 1.24e-08 1.40e-08 2.03e-08 5.78e-08 4.10e-08 7.52e-08 erg/cm2
Peak flux Cutoff-PL 4.88e-01 3.59e-01 1.75e-01 1.21e-01 1.08e+00 1.14e+00 ph/cm2/s
Error 1.10e-01 6.10e-02 4.52e-02 9.41e-02 1.61e-01 1.88e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- 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 2.238 0.239 - - 2.12e-03 3.52e-04 52.960 57
CPL 1.288 1.044 28.8 19.5 7.94e-03 2.78e-02 50.670 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.035 0.290 - - 7.08e-03 1.33e-03 47.940 57
CPL 1.997 0.606 4.6 -0.2 7.38e-03 2.40e-03 47.940 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: 2.560000 sec.
T50 in the 50-300 keV band: 1.152000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 12.816 -0.652 12.164
T90 10.656 -0.404 10.252
T50 3.200 0.536 3.736
Peak 1.000 -0.028 0.972
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
271.0123 -8.2888 0.0147 18.0 133.0 0.5547 13.0 TRIG_00661253
------------------------------------------
Foreground time interval of the image:
-0.652 12.164 (delta_t = 12.816 [sec])
Background time interval of the image:
-240.128 -0.652 (delta_t = 239.476 [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 -0.652 sec. to 12.164 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.23787 ( -0.229941 0.247668 )
Norm@50keV : 2.11836E-03 ( -0.000355537 0.000347876 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.96 using 59 PHA bins.
# Reduced chi-squared = 0.9291 for 57 degrees of freedom
# Null hypothesis probability = 6.274059e-01
Photon flux (15-150 keV) in 12.82 sec: 0.357834 ( -0.0419701 0.0419832 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.56782e-07 ( -3.59106e-08 3.69813e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.652 sec. to 12.164 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.28830 ( -1.37058 0.716535 )
Epeak [keV] : 28.7727 ( -27.444 11.6329 )
Norm@50keV : 7.94496E-03 ( -0.007945 0.0476813 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.67 using 59 PHA bins.
# Reduced chi-squared = 0.9049 for 56 degrees of freedom
# Null hypothesis probability = 6.760564e-01
Photon flux (15-150 keV) in 12.82 sec: 0.345194 ( -0.043711 0.04407 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.33569e-07 ( -3.8069e-08 4.38521e-08 ) ergs/cm2
Band function
Time interval is from -0.652 sec. to 12.164 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.36201 ( 1.36192 1.36192 )
beta : -4.45752 ( 3.50575 13.4871 )
Epeak [keV] : 28.9979 ( -28.3189 11.787 )
Norm@50keV : 6.98194E-03 ( -0.00331536 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.71 using 59 PHA bins.
# Reduced chi-squared = 0.9221 for 55 degrees of freedom
# Null hypothesis probability = 6.390167e-01
Photon flux (15-150 keV) in 12.82 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] : 8.60812 (-1.07396 1.2366)
R^2/D10^2 : 0.291064 (-0.121451 0.207231)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.74 using 59 PHA bins.
# Reduced chi-squared = 1.048 for 57 degrees of freedom
# Null hypothesis probability = 3.763865e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.251e-08 1.085e-08
25- 50 1.040e-07 1.697e-08
50-150 3.455e-08 1.179e-08
15-150 1.910e-07 3.384e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 44.6559 (-11.7721 18.8136)
Norm : 2.15434 (-0.427177 0.575483)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.68 using 59 PHA bins.
# Reduced chi-squared = 0.8891 for 57 degrees of freedom
# Null hypothesis probability = 7.095624e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.561e-08 1.022e-08
25- 50 9.033e-08 1.341e-08
50-150 7.850e-08 2.758e-08
15-150 2.344e-07 3.622e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.06131 (-3.61592 2.49305)
R1^2/D10^2 : 1.51511 (-1.07195 2339.46)
kT2 [keV] : 13.8938 (-4.96783 16.164)
R2^2/D10^2 : 2.91756E-02 (-0.0269474 0.190687)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.26 using 59 PHA bins.
# Reduced chi-squared = 0.9320 for 55 degrees of freedom
# Null hypothesis probability = 6.183387e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.485e-08 3.461e-08
25- 50 8.970e-08 4.565e-08
50-150 7.276e-08 4.443e-08
15-150 2.273e-07 1.180e-07
Peak spectrum fit
Power-law model
Time interval is from -0.028 sec. to 0.972 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.03475 ( -0.278935 0.301354 )
Norm@50keV : 7.08418E-03 ( -0.00135974 0.00130908 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.94 using 59 PHA bins.
# Reduced chi-squared = 0.8410 for 57 degrees of freedom
# Null hypothesis probability = 7.981695e-01
Photon flux (15-150 keV) in 1 sec: 1.07997 ( -0.158056 0.158168 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.54664e-08 ( -1.13666e-08 1.16913e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.028 sec. to 0.972 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.99692 ( -1.19252 0.0200865 )
Epeak [keV] : 4.59022 ( -3.81809 -4.17628 )
Norm@50keV : 7.37725E-03 ( -0.00236115 0.00244071 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.94 using 59 PHA bins.
# Reduced chi-squared = 0.8561 for 56 degrees of freedom
# Null hypothesis probability = 7.695914e-01
Photon flux (15-150 keV) in 1 sec: 1.07959 ( -0.163869 0.15804 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.54579e-08 ( -1.34812e-08 1.15691e-08 ) ergs/cm2
Band function
Time interval is from -0.028 sec. to 0.972 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.86439 ( 1.6061 1.6061 )
beta : -2.06646 ( 2.11311 0.35438 )
Epeak [keV] : 19.3692 ( -28.0243 -28.0243 )
Norm@50keV : 14.0168 ( -14.0362 3089.65 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.84 using 59 PHA bins.
# Reduced chi-squared = 0.8698 for 55 degrees of freedom
# Null hypothesis probability = 7.423315e-01
Photon flux (15-150 keV) in 1 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] : 9.29616 (-1.59331 1.97557)
R^2/D10^2 : 0.643779 (-0.339592 0.703765)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.34 using 59 PHA bins.
# Reduced chi-squared = 1.059 for 57 degrees of freedom
# Null hypothesis probability = 3.561012e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.100e-08 3.244e-09
25- 50 2.459e-08 5.735e-09
50-150 1.035e-08 4.134e-09
15-150 4.594e-08 1.066e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 63.9625 (-23.9049 51.3053)
Norm : 5.45147 (-1.25272 1.71406)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.01 using 59 PHA bins.
# Reduced chi-squared = 0.8598 for 57 degrees of freedom
# Null hypothesis probability = 7.652686e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.383e-08 2.880e-09
25- 50 2.146e-08 3.775e-09
50-150 2.572e-08 1.159e-08
15-150 6.101e-08 1.477e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.86737 (-2.49251 2.51182)
R1^2/D10^2 : 3.00343 (-2.12893 24.1115)
kT2 [keV] : 22.9273 (-10.5089 69.3216)
R2^2/D10^2 : 1.43128E-02 (-0.0135754 0.148607)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.81 using 59 PHA bins.
# Reduced chi-squared = 0.8875 for 55 degrees of freedom
# Null hypothesis probability = 7.087124e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.466e-08 8.142e-09
25- 50 2.002e-08 1.045e-08
50-150 3.010e-08 1.731e-08
15-150 6.477e-08 3.405e-08
Plot creation:
Sat Oct 24 13:06:02 EDT 2015