batgrbproduct Analysis for Trigger=635794
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 02:08:06 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger635794/GCN5_download_cron
======================================================================
Trigger: 00635794 Segment: 000
BAT Trigger Time: 448707832 [s; MET]
Trigger Stop: 448707896 [s; MET]
UTC: 2015-03-22T09:03:38.657120 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 83.8554676556244 Dec: 21.5399692891845 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 21.05
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 21.05
Flight Position: [ source = BAT ]
RA: 83.8554676556244 Dec: 21.5399692891845 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 83.8523268726303 Dec: 21.5423003803039 [deg; J2000]
{ 05h 35m 24.6s , +21d 32' 32.3" }
+/- 0.94098129433977 [arcmin] (estimated 90% radius based on SNR)
+/- 0.298311195133645 [arcmin] (formal 1-sigma fit error)
SNR: 33.1787349078738
Angular difference between Flight and Ground position is 0.224248 arcmin
Partial Coding Fraction: 1 [ 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 1.163183 1.034500 0.481567 0.121533
0.043922 0.044549 0.037479 0.030726 [error]
Peak 1.163183 1.034500 0.481567 0.121533
0.043922 0.044549 0.037479 0.030726 [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 3.24e-07 4.14e-07 3.88e-07 6.38e-07 1.34e-06 1.76e-06 erg/cm2
Error 2.69e-08 2.16e-08 3.62e-08 1.22e-07 8.04e-08 1.57e-07 erg/cm2
Peak flux Power-law 1.65e-01 1.17e-01 5.47e-02 3.59e-02 3.54e-01 3.73e-01 ph/cm2/s
Error 1.40e-02 6.12e-03 4.92e-03 6.38e-03 1.92e-02 1.95e-02 ph/cm2/s
Fluence Cutoff-PL 3.24e-07 4.15e-07 3.87e-07 6.30e-07 1.34e-06 1.76e-06 erg/cm2
Error 2.12e-08 2.25e-08 3.60e-08 2.22e-07 8.75e-08 2.49e-07 erg/cm2
Peak flux Cutoff-PL 1.65e-01 1.17e-01 5.46e-02 3.54e-02 3.54e-01 3.73e-01 ph/cm2/s
Error 1.40e-02 4.92e-03 4.93e-03 1.10e-02 1.46e-02 2.33e-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 2.097 0.110 - - 2.26e-03 1.48e-04 47.230 57
CPL 2.141 0.000 138.0 0.0 2.13e-03 1.10e-03 47.200 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.097 0.110 - - 2.26e-03 1.48e-04 47.230 57
CPL 2.141 0.000 138.0 0.0 2.13e-03 1.10e-03 47.200 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
83.8523 +21.5423 0.0058 0.2 -147.9 2.8203 33.2 TRIG_00635794
------------------------------------------
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: 2.09674 ( -0.10867 0.111548 )
Norm@50keV : 2.25512E-03 ( -0.000149315 0.000147268 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.23 using 59 PHA bins.
# Reduced chi-squared = 0.8286 for 57 degrees of freedom
# Null hypothesis probability = 8.184729e-01
Photon flux (15-150 keV) in 64 sec: 0.354218 ( -0.0191542 0.0192101 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.34054e-06 ( -7.99674e-08 8.07443e-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: 2.14053 ( )
Epeak [keV] : 137.989 ( )
Norm@50keV : 2.13199E-03 ( -0.00066172 0.0015309 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.20 using 59 PHA bins.
# Reduced chi-squared = 0.8429 for 56 degrees of freedom
# Null hypothesis probability = 7.926166e-01
Photon flux (15-150 keV) in 64 sec: 0.354205 ( -0.010191 0.019037 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.33963e-06 ( -9.35104e-08 8.15552e-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 : -1.56033 ( 1.56305 1.56305 )
beta : -2.11881 ( 2.1189 0.127513 )
Epeak [keV] : 21.4632 ( -21.5316 30.2602 )
Norm@50keV : 5.53115E-03 ( -0.00318289 2353.75 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.08 using 59 PHA bins.
# Reduced chi-squared = 0.8560 for 55 degrees of freedom
# Null hypothesis probability = 7.674458e-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] : 9.72947 ( )
R^2/D10^2 : 0.169201 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 138.16 using 59 PHA bins.
# Reduced chi-squared = 2.4239 for 57 degrees of freedom
# Null hypothesis probability = 1.087094e-08
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.067e-07 1.930e-08
25- 50 4.941e-07 2.979e-08
50-150 2.381e-07 3.536e-08
15-150 9.389e-07 6.208e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 60.9750 (-9.77941 12.5552)
Norm : 1.78951 (-0.175205 0.182233)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.03 using 59 PHA bins.
# Reduced chi-squared = 0.9829 for 57 degrees of freedom
# Null hypothesis probability = 5.115879e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.886e-07 2.330e-08
25- 50 4.414e-07 2.269e-08
50-150 5.089e-07 6.790e-08
15-150 1.239e-06 7.392e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.78858 (-1.00458 1.06523)
R1^2/D10^2 : 1.00562 (-0.455821 1.05104)
kT2 [keV] : 21.3841 (-4.6356 8.13957)
R2^2/D10^2 : 5.76261E-03 (-0.00386758 0.00932813)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.01 using 59 PHA bins.
# Reduced chi-squared = 1.000 for 55 degrees of freedom
# Null hypothesis probability = 4.741156e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.033e-07 5.709e-08
25- 50 4.146e-07 5.338e-08
50-150 5.805e-07 1.781e-07
15-150 1.298e-06 2.512e-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: 2.09674 ( -0.10867 0.111548 )
Norm@50keV : 2.25512E-03 ( -0.000149315 0.000147268 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.23 using 59 PHA bins.
# Reduced chi-squared = 0.8286 for 57 degrees of freedom
# Null hypothesis probability = 8.184729e-01
Photon flux (15-150 keV) in 64 sec: 0.354218 ( -0.0191542 0.0192101 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.34054e-06 ( -7.99674e-08 8.07443e-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: 2.14053 ( )
Epeak [keV] : 137.989 ( )
Norm@50keV : 2.13199E-03 ( -0.00066172 0.0015309 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.20 using 59 PHA bins.
# Reduced chi-squared = 0.8429 for 56 degrees of freedom
# Null hypothesis probability = 7.926166e-01
Photon flux (15-150 keV) in 64 sec: 0.354205 ( -0.010191 0.019037 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.33963e-06 ( -9.35104e-08 8.15552e-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 : -1.56033 ( 1.56305 1.56305 )
beta : -2.11881 ( 2.1189 0.127513 )
Epeak [keV] : 21.4632 ( -21.5316 30.2602 )
Norm@50keV : 5.53115E-03 ( -0.00318289 2420.43 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.08 using 59 PHA bins.
# Reduced chi-squared = 0.8560 for 55 degrees of freedom
# Null hypothesis probability = 7.674458e-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] : 9.72947 ( )
R^2/D10^2 : 0.169201 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 138.16 using 59 PHA bins.
# Reduced chi-squared = 2.4239 for 57 degrees of freedom
# Null hypothesis probability = 1.087094e-08
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.067e-07 2.083e-08
25- 50 4.941e-07 2.842e-08
50-150 2.381e-07 3.555e-08
15-150 9.389e-07 5.600e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 60.9750 (-9.77941 12.5552)
Norm : 1.78951 (-0.175205 0.182233)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.03 using 59 PHA bins.
# Reduced chi-squared = 0.9829 for 57 degrees of freedom
# Null hypothesis probability = 5.115879e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.886e-07 2.390e-08
25- 50 4.414e-07 2.291e-08
50-150 5.089e-07 6.554e-08
15-150 1.239e-06 8.032e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.78858 (-1.00458 1.06523)
R1^2/D10^2 : 1.00562 (-0.455821 1.05104)
kT2 [keV] : 21.3841 (-4.6356 8.13957)
R2^2/D10^2 : 5.76261E-03 (-0.00386758 0.00932813)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.01 using 59 PHA bins.
# Reduced chi-squared = 1.000 for 55 degrees of freedom
# Null hypothesis probability = 4.741156e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.033e-07 5.024e-08
25- 50 4.146e-07 6.106e-08
50-150 5.805e-07 1.850e-07
15-150 1.298e-06 3.453e-07
Plot creation:
Mon Mar 23 02:11:05 EDT 2015