batgrbproduct Analysis for Trigger=503526
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): Tue Sep 20 11:43:35 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger503526/GCN5_download_cron
======================================================================
Trigger: 00503526 Segment: 000
BAT Trigger Time: 338160351.692 [s; MET]
Trigger Stop: 338160351.708 [s; MET]
UTC: 2011-09-19T21:25:44.309620 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 251.78253290015 Dec: -45.8721472697937 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 9.58
Image Trigger?: NO
Rate S/N Ratio: 21.51743479135 [ if not an image trigger ]
Image S/N Ratio: 9.58
Flight Position: [ source = BAT ]
RA: 251.78253290015 Dec: -45.8721472697937 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 251.791996821554 Dec: -45.8400216585775 [deg; J2000]
{ 16h 47m 10.1s , -45d 50' 24.1" }
+/- 2.07429054018002 [arcmin] (estimated 90% radius based on SNR)
+/- 1.058032929009 [arcmin] (formal 1-sigma fit error)
SNR: 10.7262407825205
Angular difference between Flight and Ground position is 1.967689 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 0.0320000052452087 +/- 0.0126490608803104
Measured from: 1.19209289550781e-07
to: 0.0320001244544983 [s; relative to TRIGTIME]
T50: 0.015999972820282 +/- 0.00894429003608426
Measured from: 0.00400012731552124
to: 0.0200001001358032 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.477999985218048
to: 0.522000014781952 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.0400000214576721 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.009372 0.017477 0.002135 0.001235
0.001778 0.001961 0.001099 0.000801 [error]
Peak 0.011793 0.025404 0.003542 -0.002504
0.006358 0.005954 0.004740 0.004222 [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 3.06e-09 3.16e-09 2.29e-09 2.67e-09 9.55e-09 1.12e-08 erg/cm2
Error 6.80e-10 6.51e-10 7.18e-10 1.43e-09 2.07e-09 2.83e-09 erg/cm2
Peak flux Power-law 1.44e-01 1.08e-01 5.39e-02 3.85e-02 3.24e-01 3.44e-01 ph/cm2/s
Error 7.62e-02 4.48e-02 3.35e-02 5.09e-02 1.34e-01 1.44e-01 ph/cm2/s
Fluence Cutoff-PL 2.81e-09 6.93e-09 5.11e-10 3.96e-14 1.03e-08 1.03e-08 erg/cm2
Error 6.16e-10 1.31e-09 6.56e-10 1.86e-12 1.79e-09 1.79e-09 erg/cm2
Peak flux Cutoff-PL 1.26e-01 2.08e-01 5.33e-03 2.06e-08 3.38e-01 3.37e-01 ph/cm2/s
Error 5.55e-02 7.02e-02 8.87e-03 3.23e-06 1.06e-01 1.07e-01 ph/cm2/s
Fluence Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.465 0.274 - - 2.41e-02 6.08e-03 96.180 57
CPL -7.378 0.000 31.2 2.5 7.94e+04 0.00e+00 54.960 56
The chi2 of BB fit is 62.93 which shows a significant improvement in the fit over a PL.
Check the BB fit.
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.995 0.690 - - 2.16e-03 1.08e-03 62.760 57
CPL -9.930 0.000 31.0 3.8 2.47e+05 6.93e+05 50.620 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 0.040 0.000 0.040
T90 0.032 0.000 0.032
T50 0.016 0.004 0.020
Peak 1.000 -0.478 0.522
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
251.7920 -45.8400 0.0179 0.0 99.3 0.0301 10.7 TRIG_00503526
------------------------------------------
Foreground time interval of the image:
0.000 0.040 (delta_t = 0.040 [sec])
Background time interval of the image:
-239.692 0.000 (delta_t = 239.692 [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 0.000 sec. to 0.040 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.46531 ( -0.256242 0.292082 )
Norm@50keV : 2.40680E-02 ( -0.00607577 0.00608373 )
------------------------------------------------------------
# Chi-Squared = 96.18 using 59 PHA bins.
# Reduced chi-squared = 1.687 for 57 degrees of freedom
# Null hypothesis probability = 9.079597e-04
Photon flux (15-150 keV) in 0.04 sec: 4.62901 ( -0.915995 0.916084 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.5516e-09 ( -2.0528e-09 2.08359e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.040 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -7.37786 ( )
Epeak [keV] : 31.1563 ( -2.49025 2.54576 )
Norm@50keV : 7.93664E+04 ( )
------------------------------------------------------------
# Chi-Squared = 54.96 using 59 PHA bins.
# Reduced chi-squared = 0.9814 for 56 degrees of freedom
# Null hypothesis probability = 5.143824e-01
Photon flux (15-150 keV) in 0.04 sec: 5.53064 ( -0.93117 0.93551 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.02502e-08 ( -1.76652e-09 1.81928e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.040 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99735 ( -732.28 -722.28 )
beta : -9.99312 ( 467.835 477.835 )
Epeak [keV] : 31.5542 ( -2.65217 2.66852 )
Norm@50keV : 1993.08 ( -1068.12 1549.37 )
------------------------------------------------------------
# Chi-Squared = 55.80 using 59 PHA bins.
# Reduced chi-squared = 1.015 for 55 degrees of freedom
# Null hypothesis probability = 4.446099e-01
Photon flux (15-150 keV) in 0.04 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] : 8.01948 (-0.865384 0.933367)
R^2/D10^2 : 7.13914 (-2.69523 4.18012)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 62.93 using 59 PHA bins.
# Reduced chi-squared = 1.104 for 57 degrees of freedom
# Null hypothesis probability = 2.745208e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.327e-09 8.794e-10
25- 50 5.848e-09 1.370e-09
50-150 1.548e-09 6.844e-10
15-150 1.072e-08 2.082e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 32.8031 (-7.76707 10.8167)
Norm : 39.9706 (-10.2309 12.7634)
------------------------------------------------------------
# Chi-Squared = 82.43 using 59 PHA bins.
# Reduced chi-squared = 1.446 for 57 degrees of freedom
# Null hypothesis probability = 1.543918e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.397e-09 7.562e-10
25- 50 4.070e-09 9.254e-10
50-150 2.498e-09 1.258e-09
15-150 9.965e-09 2.462e-09
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.02220 (-8.02021 -8.02021)
R1^2/D10^2 : 2.87436 (-2.87379 -2.87379)
kT2 [keV] : 8.01633 (-8.01869 191.97)
R2^2/D10^2 : 4.26756 (-4.26696 -4.26696)
------------------------------------------------------------
# Chi-Squared = 62.93 using 59 PHA bins.
# Reduced chi-squared = 1.144 for 55 degrees of freedom
# Null hypothesis probability = 2.161004e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.327e-09 1.220e-01
25- 50 5.847e-09 1.144e+00
50-150 1.547e-09 2.996e+01
15-150 1.072e-08 3.308e+01
Peak spectrum fit
Power-law model
Time interval is from -0.478 sec. to 0.522 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.99485 ( -0.65714 0.72342 )
Norm@50keV : 2.16280E-03 ( -0.00107935 0.00107585 )
------------------------------------------------------------
# Chi-Squared = 62.76 using 59 PHA bins.
# Reduced chi-squared = 1.101 for 57 degrees of freedom
# Null hypothesis probability = 2.796136e-01
Photon flux (15-150 keV) in 1 sec: 0.323681 ( -0.133946 0.133986 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.98893e-08 ( -9.10944e-09 9.99274e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.478 sec. to 0.522 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -9.93040 ( )
Epeak [keV] : 30.9809 ( -3.70921 3.84737 )
Norm@50keV : 2.46786E+05 ( -258952 1.12649e+06 )
------------------------------------------------------------
# Chi-Squared = 50.62 using 59 PHA bins.
# Reduced chi-squared = 0.9040 for 56 degrees of freedom
# Null hypothesis probability = 6.778620e-01
Photon flux (15-150 keV) in 1 sec: 0.338393 ( -0.106519 0.106447 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.55859e-08 ( -4.9064e-09 4.9376e-09 ) ergs/cm2
Band function
Time interval is from -0.478 sec. to 0.522 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99971 ( -6680.17 -6665.18 )
beta : -6.75251 ( 5.69601 2.85976 )
Epeak [keV] : 31.2672 ( -4.56176 5.56333 )
Norm@50keV : 129.952 ( -138.963 272.877 )
------------------------------------------------------------
# Chi-Squared = 53.31 using 59 PHA bins.
# Reduced chi-squared = 0.9693 for 55 degrees of freedom
# Null hypothesis probability = 5.392867e-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] : 7.90786 (-1.75523 2.50456)
R^2/D10^2 : 0.453112 (-0.453112 0.783766)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 57.05 using 59 PHA bins.
# Reduced chi-squared = 1.001 for 57 degrees of freedom
# Null hypothesis probability = 4.730893e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.079e-09 3.199e-09
25- 50 8.712e-09 5.645e-09
50-150 2.202e-09 1.705e-09
15-150 1.599e-08 1.038e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 45.9367 (-25.4001 -45.9632)
Norm : 2.01395 (-1.03606 1.89448)
------------------------------------------------------------
# Chi-Squared = 61.39 using 59 PHA bins.
# Reduced chi-squared = 1.077 for 57 degrees of freedom
# Null hypothesis probability = 3.215368e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.822e-09 2.987e-09
25- 50 6.711e-09 4.283e-09
50-150 6.001e-09 5.035e-09
15-150 1.753e-08 1.160e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 199.999 ( )
R1^2/D10^2 : 1.66778E-05 (-1.64482e-05 4.28398e-05)
kT2 [keV] : 7.61420 (-1.70761 2.51525)
R2^2/D10^2 : 0.506257 (-0.340462 0.852748)
------------------------------------------------------------
# Chi-Squared = 57.05 using 59 PHA bins.
# Chi-Squared = 56.70 using 59 PHA bins.
# Reduced chi-squared = 1.037 for 55 degrees of freedom
# Reduced chi-squared = 1.031 for 55 degrees of freedom
# Null hypothesis probability = 3.986492e-01
# Null hypothesis probability = 4.113632e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.076e-09 7.320e-01
25- 50 8.713e-09 6.235e+00
50-150 2.205e-09 1.537e+02
15-150 1.599e-08 1.514e+02
Plot creation:
Tue Sep 20 11:52:38 EDT 2011