batgrbproduct Analysis for Trigger=635795
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 02:03:22 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger635795/GCN5_download_cron
======================================================================
Trigger: 00635795 Segment: 000
BAT Trigger Time: 448708784 [s; MET]
Trigger Stop: 448708848 [s; MET]
UTC: 2015-03-22T09:19:30.657080 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 245.197466043188 Dec: -15.0177976124249 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 18.3
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 18.3
Flight Position: [ source = BAT ]
RA: 245.197466043188 Dec: -15.0177976124249 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 245.19854822143 Dec: -15.0176200466392 [deg; J2000]
{ 16h 20m 47.7s , -15d 01' 03.4" }
+/- 1.24576269593993 [arcmin] (estimated 90% radius based on SNR)
+/- 0.442934339549977 [arcmin] (formal 1-sigma fit error)
SNR: 22.2219520350869
Angular difference between Flight and Ground position is 0.063612 arcmin
Partial Coding Fraction: 0.9296875 [ 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 2.025215 0.168934 -0.014847 0.009267
0.052491 0.048944 0.041704 0.035509 [error]
Peak 2.025215 0.168934 -0.014847 0.009267
0.052491 0.048944 0.041704 0.035509 [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 6.41e-07 9.05e-08 5.74e-09 3.86e-10 7.38e-07 7.38e-07 erg/cm2
Error 6.78e-08 2.09e-08 3.25e-09 3.84e-10 7.07e-08 7.07e-08 erg/cm2
Peak flux Power-law 3.53e-01 2.92e-02 9.25e-04 3.03e-05 3.83e-01 3.83e-01 ph/cm2/s
Error 3.86e-02 6.42e-03 5.11e-04 2.92e-05 3.87e-02 3.87e-02 ph/cm2/s
Fluence Cutoff-PL 6.50e-07 6.79e-08 3.70e-10 2.55e-14 7.19e-07 7.19e-07 erg/cm2
Error 7.18e-08 3.19e-08 3.81e-09 3.05e-10 7.32e-08 7.32e-08 erg/cm2
Peak flux Cutoff-PL 3.56e-01 2.29e-02 6.63e-05 2.42e-09 3.79e-01 3.79e-01 ph/cm2/s
Error 4.09e-02 9.68e-03 6.09e-04 2.36e-05 4.02e-02 4.02e-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 5.979 0.475 - - 9.52e-05 4.38e-05 46.170 57
CPL 1.000 0.000 50.0 0.0 2.20e-03 0.00e+00 274.670 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 5.979 0.475 - - 9.52e-05 4.38e-05 46.170 57
CPL 1.000 0.000 50.0 0.0 2.20e-03 0.00e+00 274.670 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
245.1985 -15.0176 0.0086 25.1 -159.8 2.2554 22.2 TRIG_00635795
------------------------------------------
Foreground time interval of the image:
0.000 64.000 (delta_t = 64.000 [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
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 5.97857 ( -0.46668 0.482652 )
Norm@50keV : 9.51619E-05 ( -3.58962e-05 5.16776e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.17 using 59 PHA bins.
# Reduced chi-squared = 0.8099 for 57 degrees of freedom
# Null hypothesis probability = 8.469911e-01
Photon flux (15-150 keV) in 64 sec: 0.383280 ( -0.0386472 0.0387436 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.37536e-07 ( -7.07187e-08 7.07558e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 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 : 2.20091E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 274.67 using 59 PHA bins.
# Reduced chi-squared = 4.9048 for 56 degrees of freedom
# Null hypothesis probability = 1.358975e-30
Photon flux (15-150 keV) in 64 sec: 0.379440 ( -0.040391 0.040055 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.18771e-07 ( -7.3376e-08 7.29792e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.74655 ( 1.74507 1.74507 )
beta : -10.0000 ( 10 10 )
Epeak [keV] : 1.21560 ( -0.156927 1.23186 )
Norm@50keV : 0.322938 ( -0.182893 2433.73 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.27 using 59 PHA bins.
# Reduced chi-squared = 0.8049 for 55 degrees of freedom
# Null hypothesis probability = 8.493167e-01
Photon flux (15-150 keV) in 64 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] : 2.51408 (-0.208224 0.240454)
R^2/D10^2 : 179.326 (-91.6341 184.113)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.60 using 59 PHA bins.
# Reduced chi-squared = 0.8000 for 57 degrees of freedom
# Null hypothesis probability = 8.609740e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.557e-07 1.768e-07
25- 50 4.931e-08 1.505e-08
50-150 1.646e-11 1.316e-11
15-150 7.050e-07 1.832e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 4.45886 (-0.544225 0.67453)
Norm : 135.196 (-60.4185 110.439)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.31 using 59 PHA bins.
# Reduced chi-squared = 0.7774 for 57 degrees of freedom
# Null hypothesis probability = 8.899898e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.530e-07 1.273e-07
25- 50 6.294e-08 1.934e-08
50-150 1.771e-10 1.364e-10
15-150 7.162e-07 1.410e-07
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.50893 (-0.226663 0.263351)
R1^2/D10^2 : 182.014 (-92.0003 206.557)
kT2 [keV] : 200.000 ( )
R2^2/D10^2 : 2.87202E-06 (-2.87202e-06 -2.87202e-06)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.60 using 59 PHA bins.
#Fit statistic : Chi-Squared = 44.94 using 59 PHA bins.
# Reduced chi-squared = 0.8291 for 55 degrees of freedom
# Reduced chi-squared = 0.8171 for 55 degrees of freedom
# Null hypothesis probability = 8.127798e-01
# Null hypothesis probability = 8.315552e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.547e-07 1.386e-07
25- 50 4.949e-08 1.504e-08
50-150 1.853e-11 1.270e-11
15-150 7.041e-07 1.540e-07
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 5.97857 ( -0.46668 0.482652 )
Norm@50keV : 9.51619E-05 ( -3.58962e-05 5.16776e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.17 using 59 PHA bins.
# Reduced chi-squared = 0.8099 for 57 degrees of freedom
# Null hypothesis probability = 8.469911e-01
Photon flux (15-150 keV) in 64 sec: 0.383280 ( -0.0386472 0.0387436 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.37536e-07 ( -7.07187e-08 7.07558e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 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 : 2.20091E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 274.67 using 59 PHA bins.
# Reduced chi-squared = 4.9048 for 56 degrees of freedom
# Null hypothesis probability = 1.358975e-30
Photon flux (15-150 keV) in 64 sec: 0.379440 ( -0.040391 0.040055 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.18771e-07 ( -7.3376e-08 7.29792e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.74655 ( 1.74507 1.74507 )
beta : -10.0000 ( 10 10 )
Epeak [keV] : 1.21560 ( -0.156927 1.23185 )
Norm@50keV : 0.322938 ( -0.182893 3212.57 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.27 using 59 PHA bins.
# Reduced chi-squared = 0.8049 for 55 degrees of freedom
# Null hypothesis probability = 8.493167e-01
Photon flux (15-150 keV) in 64 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] : 2.51408 (-0.208224 0.240454)
R^2/D10^2 : 179.326 (-91.6341 184.113)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.60 using 59 PHA bins.
# Reduced chi-squared = 0.8000 for 57 degrees of freedom
# Null hypothesis probability = 8.609740e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.557e-07 1.708e-07
25- 50 4.931e-08 1.520e-08
50-150 1.646e-11 1.284e-11
15-150 7.050e-07 1.431e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 4.45886 (-0.544225 0.67453)
Norm : 135.196 (-60.4185 110.439)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.31 using 59 PHA bins.
# Reduced chi-squared = 0.7774 for 57 degrees of freedom
# Null hypothesis probability = 8.899898e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.530e-07 1.315e-07
25- 50 6.294e-08 1.693e-08
50-150 1.771e-10 1.365e-10
15-150 7.162e-07 1.448e-07
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.50893 (-0.226663 0.263351)
R1^2/D10^2 : 182.014 (-92.0003 206.557)
kT2 [keV] : 200.000 ( )
R2^2/D10^2 : 2.87202E-06 (-2.87202e-06 -2.87202e-06)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.60 using 59 PHA bins.
#Fit statistic : Chi-Squared = 44.94 using 59 PHA bins.
# Reduced chi-squared = 0.8291 for 55 degrees of freedom
# Reduced chi-squared = 0.8171 for 55 degrees of freedom
# Null hypothesis probability = 8.127798e-01
# Null hypothesis probability = 8.315552e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.547e-07 1.536e-07
25- 50 4.949e-08 1.549e-08
50-150 1.853e-11 1.381e-11
15-150 7.041e-07 1.474e-07
Plot creation:
Mon Mar 23 02:06:58 EDT 2015