batgrbproduct Analysis for Trigger=735188
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 15 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time (local time): Fri Jan 27 19:34:05 EST 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger735188
======================================================================
Trigger: 00735188 Segment: 000
BAT Trigger Time: 507123060.8 [s; MET]
Trigger Stop: 507123061.824 [s; MET]
UTC: 2017-01-26T11:30:42.281540 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 263.579092607182 Dec: -64.7575950508616 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.35
Image Trigger?: NO
Rate S/N Ratio: 36.5239647354993 [ if not an image trigger ]
Image S/N Ratio: 7.35
Flight Position: [ source = BAT ]
RA: 263.579092607182 Dec: -64.7575950508616 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 263.622615001143 Dec: -64.7552442343973 [deg; J2000]
{ 17h 34m 29.4s , -64d 45' 18.9" }
+/- 1.56973204093526 [arcmin] (estimated 90% radius based on SNR)
+/- 0.5826828147446 [arcmin] (formal 1-sigma fit error)
SNR: 15.9723063997728
Angular difference between Flight and Ground position is -5235.990145 arcmin
Partial Coding Fraction: 0.04003906 [ including projection effects ]
Duration
T90: 9.53600001335144 +/- 1.58068339013808
Measured from: -0.184000015258789
to: 9.35199999809265 [s; relative to TRIGTIME]
T50: 3.90400004386902 +/- 0.891416807562371
Measured from: 0.839999973773956
to: 4.74400001764297 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.307999968528748
to: 1.30799996852875 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.759999990463257
to: 10.8880000114441 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.075510 1.799157 1.286661 0.451270
0.118057 0.127477 0.111818 0.086729 [error]
Peak 0.256590 0.368200 0.257477 0.109069
0.040015 0.046910 0.044544 0.033263 [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 3.98e-07 7.14e-07 9.82e-07 2.80e-06 2.83e-06 4.90e-06 erg/cm2
Error 5.62e-08 6.26e-08 1.06e-07 6.36e-07 2.58e-07 7.19e-07 erg/cm2
Peak flux Power-law 2.33e+00 2.41e+00 1.75e+00 2.05e+00 7.28e+00 8.54e+00 ph/cm2/s
Error 5.91e-01 3.82e-01 3.44e-01 8.20e-01 1.10e+00 1.33e+00 ph/cm2/s
Fluence Cutoff-PL 3.84e-07 7.35e-07 1.00e-06 1.94e-06 2.79e-06 4.06e-06 erg/cm2
Error 6.40e-08 7.67e-08 1.15e-07 8.88e-07 2.75e-07 1.08e-06 erg/cm2
Peak flux Cutoff-PL 2.38e+00 2.42e+00 1.73e+00 1.97e+00 7.29e+00 8.48e+00 ph/cm2/s
Error 5.92e-01 3.77e-01 3.46e-01 1.04e+00 1.10e+00 1.29e+00 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 1.540 0.141 - - 2.58e-02 2.18e-03 74.200 57
CPL 1.297 0.469 145.3 -37.1 3.43e-02 3.34e-02 73.570 56
The chi2 of BB fit is Chi-Squared Chi-Squared 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 1.457 0.262 - - 5.90e-02 9.19e-03 53.640 57
CPL 1.467 0.406 9999.4 0.0 5.88e-02 3.14e-02 53.660 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: 5.696000 sec.
T50 in the 50-300 keV band: 2.816000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 11.648 -0.760 10.888
T90 9.536 -0.184 9.352
T50 3.904 0.840 4.744
Peak 1.000 0.308 1.308
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
263.6226 -64.7552 0.0121 40.9155 -90.1683 3.6988965 15.972 TRIG_00735188
Foreground time interval of the image:
-0.308 11.701 (delta_t = 12.009 [sec])
Background time interval of the image:
-239.800 -0.308 (delta_t = 239.492 [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 -0.760 sec. to 10.888 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.54029 ( -0.14027 0.141159 )
Norm@50keV : 2.57870E-02 ( -0.00218659 0.00217923 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.20 using 59 PHA bins.
# Reduced chi-squared = 1.302 for 57 degrees of freedom
# Null hypothesis probability = 6.251687e-02
Photon flux (15-150 keV) in 11.65 sec: 3.25539 ( -0.279396 0.279812 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.83216e-06 ( -2.57314e-07 2.58571e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.760 sec. to 10.888 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.29737 ( -0.578704 0.359732 )
Epeak [keV] : 145.323 ( -71.1867 -145.325 )
Norm@50keV : 3.43057E-02 ( -0.0343055 0.0324355 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.57 using 59 PHA bins.
# Reduced chi-squared = 1.314 for 56 degrees of freedom
# Null hypothesis probability = 5.772023e-02
Photon flux (15-150 keV) in 11.65 sec: 3.22814 ( -0.28528 0.2854 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.7915e-06 ( -2.76722e-07 2.73868e-07 ) ergs/cm2
Band function
Time interval is from -0.760 sec. to 10.888 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.216489 ( 0.471288 5.31818 )
beta : -1.71299 ( 1.7108 0.241268 )
Epeak [keV] : 47.6322 ( -47.4955 220.876 )
Norm@50keV : 0.169323 ( -0.179011 1702.24 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.82 using 59 PHA bins.
# Reduced chi-squared = 1.306 for 55 degrees of freedom
# Null hypothesis probability = 6.343867e-02
Photon flux (15-150 keV) in 11.65 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] : 14.0881 (-1.45523 1.69765)
R^2/D10^2 : 0.458571 (-0.154686 0.221831)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 109.80 using 59 PHA bins.
# Reduced chi-squared = 1.9264 for 57 degrees of freedom
# Null hypothesis probability = 3.346191e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.238e-07 3.559e-08
25- 50 8.377e-07 9.530e-08
50-150 1.098e-06 1.883e-07
15-150 2.160e-06 2.301e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.361 (-61.3348 -199.363)
Norm : 13.3270 (-1.10267 1.10443)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.58 using 59 PHA bins.
# Reduced chi-squared = 1.291 for 57 degrees of freedom
# Null hypothesis probability = 6.880534e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.866e-07 3.641e-08
25- 50 7.437e-07 1.219e-07
50-150 1.631e-06 6.522e-07
15-150 2.761e-06 6.198e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.49319 (-1.62073 1.75257)
R1^2/D10^2 : 2.02291 (-0.908742 1.99621)
kT2 [keV] : 35.4919 (-10.1456 28.2647)
R2^2/D10^2 : 1.34868E-02 (-0.0108538 0.0295157)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.45 using 59 PHA bins.
# Reduced chi-squared = 1.281 for 55 degrees of freedom
# Null hypothesis probability = 7.830841e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.480e-07 9.396e-08
25- 50 8.025e-07 2.028e-07
50-150 1.689e-06 7.857e-07
15-150 2.839e-06 1.044e-06
Peak spectrum fit
Power-law model
Time interval is from 0.308 sec. to 1.308 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.45712 ( -0.260042 0.263774 )
Norm@50keV : 5.89849E-02 ( -0.00925142 0.00913354 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.64 using 59 PHA bins.
# Reduced chi-squared = 0.9410 for 57 degrees of freedom
# Null hypothesis probability = 6.019397e-01
Photon flux (15-150 keV) in 1 sec: 7.28199 ( -1.10286 1.10335 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.63712e-07 ( -9.75899e-08 9.86213e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.308 sec. to 1.308 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.46709 ( -0.558977 0.253841 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 5.87631E-02 ( -0.0091435 0.0536752 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.66 using 59 PHA bins.
# Reduced chi-squared = 0.9582 for 56 degrees of freedom
# Null hypothesis probability = 5.640054e-01
Photon flux (15-150 keV) in 1 sec: 7.29368 ( -1.1105 1.0934 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.62634e-07 ( -9.6567e-08 9.9781e-08 ) ergs/cm2
Band function
Time interval is from 0.308 sec. to 1.308 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.96522 ( -4.96522 -4.96522 )
beta : -1.55417 ( -0.324686 0.293376 )
Epeak [keV] : 23.3361 ( -23.3361 7.45161 )
Norm@50keV : 8980.64 ( -1337.95 2.93163e+07 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.35 using 59 PHA bins.
# Reduced chi-squared = 0.9518 for 55 degrees of freedom
# Null hypothesis probability = 5.765453e-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] : 12.2308 (-2.56947 3.67316)
R^2/D10^2 : 1.66137 (-1.65206 2.15012)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.97 using 59 PHA bins.
# Reduced chi-squared = 1.280 for 57 degrees of freedom
# Null hypothesis probability = 7.544346e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.264e-08 1.471e-08
25- 50 1.694e-07 4.410e-08
50-150 1.543e-07 5.884e-08
15-150 3.763e-07 9.180e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-81.4484 -199.363)
Norm : 29.8350 (-4.49724 4.49724)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.14 using 59 PHA bins.
# Reduced chi-squared = 0.9674 for 57 degrees of freedom
# Null hypothesis probability = 5.451492e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.429e-08 4.211e-08
25- 50 1.429e-07 8.080e-08
50-150 3.134e-07 1.783e-07
15-150 5.306e-07 3.010e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.08006 (-1.76738 2.13095)
R1^2/D10^2 : 6.09660 (-3.45198 5.48054)
kT2 [keV] : 82.7342 (-48.3356 -82.873)
R2^2/D10^2 : 4.87091E-03 (-0.00399219 0.0344839)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.33 using 59 PHA bins.
# Reduced chi-squared = 0.8606 for 55 degrees of freedom
# Null hypothesis probability = 7.591190e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.490e-08 3.181e-08
25- 50 1.480e-07 7.010e-08
50-150 3.724e-07 2.309e-07
15-150 5.954e-07 3.271e-07
Plot creation:
Fri Jan 27 19:59:36 EST 2017