batgrbproduct Analysis for Trigger=549841
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): Wed Feb 27 15:50:27 EST 2013
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger549841/GCN5_download_cron
======================================================================
Trigger: 00549841 Segment: 000
BAT Trigger Time: 383620911.092 [s; MET]
Trigger Stop: 383620911.124 [s; MET]
UTC: 2013-02-27T01:21:40.828620 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 272.182940122723 Dec: -20.3927283534388 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 10.59
Image Trigger?: NO
Rate S/N Ratio: 29.9165506033032 [ if not an image trigger ]
Image S/N Ratio: 10.59
Flight Position: [ source = BAT ]
RA: 272.182940122723 Dec: -20.3927283534388 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 272.158401893098 Dec: -20.3992559516043 [deg; J2000]
{ 18h 08m 38.0s , -20d 23' 57.3" }
+/- 1.73818020320213 [arcmin] (estimated 90% radius based on SNR)
+/- 0.614322080793411 [arcmin] (formal 1-sigma fit error)
SNR: 13.8078420233556
Angular difference between Flight and Ground position is 1.434492 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 0.0519999861717224 +/- 0.01442223432929
Measured from: -0.0159999132156372
to: 0.0360000729560852 [s; relative to TRIGTIME]
T50: 0.0199999213218689 +/- 0.00565686571343518
Measured from: 0.00400012731552124
to: 0.0240000486373901 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.490000009536743
to: 0.509999990463257 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0239999890327454
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 0.021236 0.021821 0.006994 0.002317
0.002417 0.002323 0.001720 0.001036 [error]
Peak 0.023989 0.018446 0.018755 -0.001679
0.006264 0.005811 0.004762 0.004230 [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 6.59e-09 6.93e-09 5.15e-09 6.20e-09 2.11e-08 2.49e-08 erg/cm2
Error 1.06e-09 9.65e-10 1.30e-09 2.88e-09 3.20e-09 4.83e-09 erg/cm2
Peak flux Power-law 1.83e-01 1.54e-01 8.85e-02 7.54e-02 4.59e-01 5.02e-01 ph/cm2/s
Error 7.71e-02 4.40e-02 3.74e-02 6.34e-02 1.31e-01 1.45e-01 ph/cm2/s
Fluence Cutoff-PL 6.19e-09 8.07e-09 4.73e-09 1.12e-09 1.99e-08 2.01e-08 erg/cm2
Error 1.18e-09 1.40e-09 1.67e-09 2.46e-09 3.25e-09 3.98e-09 erg/cm2
Peak flux Cutoff-PL 1.66e-01 1.68e-01 9.09e-02 3.13e-02 4.47e-01 4.56e-01 ph/cm2/s
Error 8.75e-02 5.42e-02 4.28e-02 5.37e-02 1.33e-01 1.91e-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 4.60e-01 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 2.427 0.245 - - 3.35e-02 6.33e-03 49.540 57
CPL 1.230 1.231 25.1 0.0 1.79e-01 0.00e+00 45.660 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.802 0.515 - - 3.33e-03 1.10e-03 51.590 57
CPL 1.027 0.000 56.6 0.0 8.86e-03 0.00e+00 50.970 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 0.064 -0.024 0.040
T90 0.052 -0.016 0.036
T50 0.020 0.004 0.024
Peak 1.000 -0.490 0.510
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
272.1584 -20.3993 0.0139 6.6 12.1 0.0531 13.8 TRIG_00549841
------------------------------------------
Foreground time interval of the image:
-0.024 0.040 (delta_t = 0.064 [sec])
Background time interval of the image:
-239.092 -55.562 (delta_t = 183.530 [sec])
-54.092 -50.462 (delta_t = 3.630 [sec])
-49.092 -41.002 (delta_t = 8.090 [sec])
-40.092 -39.512 (delta_t = 0.580 [sec])
-38.092 -37.605 (delta_t = 0.487 [sec])
-36.092 -35.502 (delta_t = 0.590 [sec])
-32.092 -31.802 (delta_t = 0.290 [sec])
-31.092 -30.416 (delta_t = 0.676 [sec])
-12.092 -11.832 (delta_t = 0.260 [sec])
-10.092 -0.024 (delta_t = 10.068 [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 -0.024 sec. to 0.040 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.42672 ( -0.231375 0.258195 )
Norm@50keV : 3.35152E-02 ( -0.00641031 0.00624014 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.54 using 59 PHA bins.
# Reduced chi-squared = 0.8692 for 57 degrees of freedom
# Null hypothesis probability = 7.480501e-01
Photon flux (15-150 keV) in 0.064 sec: 6.29948 ( -0.822051 0.822161 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.10536e-08 ( -3.17776e-09 3.23061e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.024 sec. to 0.040 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.22956 ( -1.40299 1.05888 )
Epeak [keV] : 25.1490 ( )
Norm@50keV : 0.178565 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.66 using 59 PHA bins.
# Reduced chi-squared = 0.8153 for 56 degrees of freedom
# Null hypothesis probability = 8.366727e-01
Photon flux (15-150 keV) in 0.064 sec: 6.20785 ( -0.82736 0.82699 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.98798e-08 ( -3.1593e-09 3.344e-09 ) ergs/cm2
Band function
Time interval is from -0.024 sec. to 0.040 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.22955 ( -0.446502 1.59234 )
beta : -10.00000 ( 10 20 )
Epeak [keV] : 25.1435 ( -6.03131 10.3417 )
Norm@50keV : 0.178553 ( -0.0229914 1.16863 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.66 using 59 PHA bins.
# Reduced chi-squared = 0.8301 for 55 degrees of freedom
# Null hypothesis probability = 8.112115e-01
Photon flux (15-150 keV) in 0.064 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] : 8.24221 (-1.12595 1.26153)
R^2/D10^2 : 6.30444 (-2.77895 5.14481)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.13 using 59 PHA bins.
# Reduced chi-squared = 0.9497 for 57 degrees of freedom
# Null hypothesis probability = 5.833977e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.063e-09 1.140e-09
25- 50 9.326e-09 1.814e-09
50-150 2.699e-09 1.085e-09
15-150 1.709e-08 3.037e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 37.6337 (-9.50592 13.573)
Norm : 43.3383 (-9.5398 12.709)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.70 using 59 PHA bins.
# Reduced chi-squared = 0.8017 for 57 degrees of freedom
# Null hypothesis probability = 8.587153e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.234e-09 1.036e-09
25- 50 7.982e-09 1.222e-09
50-150 5.769e-09 2.257e-09
15-150 1.998e-08 3.206e-09
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.72201 (-1.90235 2.7431)
R1^2/D10^2 : 95.9406 (-83.5792 6186.79)
kT2 [keV] : 11.2737 (-2.62541 6.75368)
R2^2/D10^2 : 1.37580 (-1.25337 1.97923)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.51 using 59 PHA bins.
# Reduced chi-squared = 0.8275 for 55 degrees of freedom
# Null hypothesis probability = 8.154391e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.245e-09 3.322e-09
25- 50 7.992e-09 4.294e-09
50-150 5.020e-09 3.040e-09
15-150 1.926e-08 9.926e-09
Peak spectrum fit
Power-law model
Time interval is from -0.490 sec. to 0.510 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.80235 ( -0.491156 0.539065 )
Norm@50keV : 3.32980E-03 ( -0.00111994 0.00107329 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.59 using 59 PHA bins.
# Reduced chi-squared = 0.9051 for 57 degrees of freedom
# Null hypothesis probability = 6.775438e-01
Photon flux (15-150 keV) in 1 sec: 0.459259 ( -0.131023 0.131171 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.0652e-08 ( -1.00034e-08 1.05263e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.490 sec. to 0.510 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.02664 ( )
Epeak [keV] : 56.6240 ( )
Norm@50keV : 8.86461E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.97 using 59 PHA bins.
# Reduced chi-squared = 0.9102 for 56 degrees of freedom
# Null hypothesis probability = 6.650898e-01
Photon flux (15-150 keV) in 1 sec: 0.446773 ( -0.132718 0.132539 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.88112e-08 ( -9.9399e-09 1.11404e-08 ) ergs/cm2
Band function
Time interval is from -0.490 sec. to 0.510 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.04518 ( -1.68463 2.19285 )
beta : -10.0000 ( 10 1.42109e-14 )
Epeak [keV] : 57.0423 ( -42.1758 -57.0423 )
Norm@50keV : 8.64834E-03 ( -0.00864837 0.137333 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.97 using 59 PHA bins.
# Reduced chi-squared = 0.9268 for 55 degrees of freedom
# Null hypothesis probability = 6.291565e-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] : 12.9672 (-4.90892 6.11833)
R^2/D10^2 : 8.29361E-02 (-0.0813695 0.386997)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.23 using 59 PHA bins.
# Reduced chi-squared = 0.9514 for 57 degrees of freedom
# Null hypothesis probability = 5.795662e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.958e-09 1.860e-09
25- 50 1.016e-08 6.225e-09
50-150 1.078e-08 7.880e-09
15-150 2.390e-08 1.487e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 95.4162 (-55.8386 -95.4204)
Norm : 2.06790 (-0.679542 1.09365)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.04 using 59 PHA bins.
# Reduced chi-squared = 0.8955 for 57 degrees of freedom
# Null hypothesis probability = 6.969684e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.403e-09 3.311e-09
25- 50 9.253e-09 5.595e-09
50-150 1.459e-08 1.144e-08
15-150 2.925e-08 1.986e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.13030 (-2.31576 3.81539)
R1^2/D10^2 : 1.72494 (-1.59287 5.5576)
kT2 [keV] : 19.4080 (-6.96653 16.7281)
R2^2/D10^2 : 1.52752E-02 (-0.0138146 0.0695686)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.46 using 59 PHA bins.
# Reduced chi-squared = 0.8992 for 55 degrees of freedom
# Null hypothesis probability = 6.855865e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.767e-09 3.502e-09
25- 50 8.708e-09 4.643e-09
50-150 1.537e-08 9.490e-09
15-150 2.985e-08 1.640e-08
Plot creation:
Wed Feb 27 16:06:54 EST 2013