batgrbproduct Analysis for Trigger=635802
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): Mon Mar 23 01:53:22 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger635802/GCN5_download_cron
======================================================================
Trigger: 00635802 Segment: 000
BAT Trigger Time: 448710888 [s; MET]
Trigger Stop: 448710952 [s; MET]
UTC: 2015-03-22T09:54:34.656960 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 245.399160102901 Dec: -14.832341861777 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.55
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.55
Flight Position: [ source = BAT ]
RA: 245.399160102901 Dec: -14.832341861777 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 245.410396556333 Dec: -14.8443618028357 [deg; J2000]
{ 16h 21m 38.5s , -14d 50' 39.7" }
+/- 2.29249377725128 [arcmin] (estimated 90% radius based on SNR)
+/- 0.870714783762392 [arcmin] (formal 1-sigma fit error)
SNR: 9.29806181853581
Angular difference between Flight and Ground position is 0.972030 arcmin
Partial Coding Fraction: 0.4101562 [ including projection effects ]
Duration
T90: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
T50: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 64 second)
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.450674 0.261018 0.130025 0.217440
0.117415 0.119089 0.105941 0.085809 [error]
Peak 2.450674 0.261018 0.130025 0.217440
0.117415 0.119089 0.105941 0.085809 [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 8.17e-07 1.11e-07 6.70e-09 4.28e-10 9.35e-07 9.35e-07 erg/cm2
Error 1.07e-07 4.58e-08 6.80e-09 8.81e-10 1.26e-07 1.26e-07 erg/cm2
Peak flux Power-law 4.61e-01 3.66e-02 1.11e-03 3.44e-05 4.98e-01 4.98e-01 ph/cm2/s
Error 6.12e-02 1.44e-02 1.09e-03 6.83e-05 6.44e-02 6.44e-02 ph/cm2/s
Fluence Cutoff-PL 8.24e-07 9.53e-08 2.21e-09 1.08e-11 9.21e-07 9.22e-07 erg/cm2
Error 1.20e-07 7.25e-08 8.02e-09 8.69e-10 1.34e-07 1.35e-07 erg/cm2
Peak flux Cutoff-PL 4.60e-01 3.65e-02 1.10e-03 3.39e-05 4.98e-01 4.98e-01 ph/cm2/s
Error 6.15e-02 2.63e-02 1.30e-03 6.77e-05 6.43e-02 6.43e-02 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 6.050 0.759 - - 1.15e-04 9.36e-05 50.470 57
CPL 1.000 0.000 50.0 0.0 4.73e-03 0.00e+00 162.380 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 6.050 0.759 - - 1.15e-04 9.36e-05 50.470 57
CPL 1.000 0.000 50.0 0.0 4.73e-03 0.00e+00 162.380 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 64.000 0.000 64.000
T90 64.000 0.000 64.000
T50 64.000 0.000 64.000
Peak 64.000 0.000 64.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
245.4104 -14.8444 0.0207 29.9 122.9 3.0944 9.3 TRIG_00635802
------------------------------------------
Foreground time interval of the image:
0.000 42.610 (delta_t = 42.610 [sec])
44.000 64.000 (delta_t = 20.000 [sec])
Background time interval of the image:
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
Multiple GTIs in the spectrum
tstart tstop
0.000000 42.610000
44.000000 64.000000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 6.04955 ( -0.731719 0.78675 )
Norm@50keV : 1.15237E-04 ( -6.49548e-05 0.000122209 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.47 using 59 PHA bins.
# Reduced chi-squared = 0.8854 for 57 degrees of freedom
# Null hypothesis probability = 7.168676e-01
Photon flux (15-150 keV) in 62.61 sec: 0.498435 ( -0.0643672 0.0643671 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.35011e-07 ( -1.25251e-07 1.26169e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
0.000000 42.610000
44.000000 64.000000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 4.73229E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 162.38 using 59 PHA bins.
# Reduced chi-squared = 2.8996 for 56 degrees of freedom
# Null hypothesis probability = 2.699344e-12
Photon flux (15-150 keV) in 62.61 sec: 0.497807 ( -0.064217 0.064286 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.20693e-07 ( -1.28325e-07 1.39288e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
0.000000 42.610000
44.000000 64.000000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.76010 ( 1.76804 1.76804 )
beta : -6.68745 ( 6.70489 1.32257 )
Epeak [keV] : 1.04518 ( -1.04518 1.17759 )
Norm@50keV : 0.608868 ( -0.396084 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.79 using 59 PHA bins.
# Reduced chi-squared = 0.9053 for 55 degrees of freedom
# Null hypothesis probability = 6.733999e-01
Photon flux (15-150 keV) in 62.61 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] : 2.32406 (-0.270989 0.321573)
R^2/D10^2 : 428.438 (-270.952 762.807)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.94 using 59 PHA bins.
# Reduced chi-squared = 0.8937 for 57 degrees of freedom
# Null hypothesis probability = 7.004857e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.514e-07 4.011e-07
25- 50 4.616e-08 2.725e-08
50-150 6.940e-12 7.581e-12
15-150 8.975e-07 4.716e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 4.07544 (-0.707844 0.95106)
Norm : 257.467 (-149.067 377.579)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.61 using 59 PHA bins.
# Reduced chi-squared = 0.8879 for 57 degrees of freedom
# Null hypothesis probability = 7.121128e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.415e-07 3.190e-07
25- 50 6.443e-08 3.118e-08
50-150 1.067e-10 1.040e-10
15-150 9.061e-07 3.336e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.27649 (-0.288813 0.325656)
R1^2/D10^2 : 497.265 (-248.882 1714.99)
kT2 [keV] : 25.4564 (-18.3895 -25.3614)
R2^2/D10^2 : 1.05031E-03 (-0.00106244 3.96792)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.98 using 59 PHA bins.
# Reduced chi-squared = 0.8724 for 55 degrees of freedom
# Null hypothesis probability = 7.374534e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.482e-07 4.461e-07
25- 50 8.365e-08 4.374e-08
50-150 2.011e-07 1.874e-07
15-150 1.133e-06 5.027e-07
Peak spectrum fit
Power-law model
Time interval is from 44.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 6.04955 ( -0.731719 0.78675 )
Norm@50keV : 1.15237E-04 ( -6.49548e-05 0.000122209 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.47 using 59 PHA bins.
# Reduced chi-squared = 0.8854 for 57 degrees of freedom
# Null hypothesis probability = 7.168676e-01
Photon flux (15-150 keV) in 62.61 sec: 0.498435 ( -0.0643672 0.0643671 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.35011e-07 ( -1.25251e-07 1.26169e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 44.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 4.73229E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 162.38 using 59 PHA bins.
# Reduced chi-squared = 2.8996 for 56 degrees of freedom
# Null hypothesis probability = 2.699344e-12
Photon flux (15-150 keV) in 62.61 sec: 0.497807 ( -0.064217 0.064286 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.20693e-07 ( -1.28325e-07 1.39288e-07 ) ergs/cm2
Band function
Time interval is from 44.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.76010 ( 1.76804 1.76804 )
beta : -6.68745 ( 6.70489 1.32257 )
Epeak [keV] : 1.04518 ( -1.04518 1.17759 )
Norm@50keV : 0.608868 ( -0.396084 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.79 using 59 PHA bins.
# Reduced chi-squared = 0.9053 for 55 degrees of freedom
# Null hypothesis probability = 6.733999e-01
Photon flux (15-150 keV) in 62.61 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] : 2.32406 (-0.270989 0.321573)
R^2/D10^2 : 428.438 (-270.952 762.807)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.94 using 59 PHA bins.
# Reduced chi-squared = 0.8937 for 57 degrees of freedom
# Null hypothesis probability = 7.004857e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.514e-07 4.231e-07
25- 50 4.616e-08 2.566e-08
50-150 6.940e-12 7.502e-12
15-150 8.975e-07 4.601e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 4.07544 (-0.707844 0.95106)
Norm : 257.467 (-149.067 377.579)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.61 using 59 PHA bins.
# Reduced chi-squared = 0.8879 for 57 degrees of freedom
# Null hypothesis probability = 7.121128e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.415e-07 3.374e-07
25- 50 6.443e-08 3.108e-08
50-150 1.067e-10 1.100e-10
15-150 9.061e-07 3.651e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.27649 (-0.288818 0.325656)
R1^2/D10^2 : 497.265 (-248.882 1714.99)
kT2 [keV] : 25.4564 (-24.9085 -25.3614)
R2^2/D10^2 : 1.05031E-03 (-0.00106244 3.96792)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.98 using 59 PHA bins.
# Reduced chi-squared = 0.8724 for 55 degrees of freedom
# Null hypothesis probability = 7.374534e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.482e-07 4.552e-07
25- 50 8.365e-08 4.333e-08
50-150 2.011e-07 1.592e-07
15-150 1.133e-06 5.303e-07
Plot creation:
Mon Mar 23 01:57:54 EDT 2015