Analysis Summary
Notes:
- 1) No attempt has been made to eliminate the non-significant decimal places.
- 2) This batgrbproduct analysis is done using the HEASARC data.
- 3) This batgrbproduct analysis is using the flight position for the mask-weighting calculation.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time: Wed Jun 1 15:33:33 EDT 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger684098
======================================================================
Trigger: 00684098 Segment: 000
BAT Trigger Time: 483319587.52 [s; MET]
Trigger Stop: 483319587.776 [s; MET]
UTC: 2016-04-25T23:26:11.341240 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 280.313549845198 Dec: -54.3595799473253 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.8
Image Trigger?: NO
Rate S/N Ratio: 32.9545141065682 [ if not an image trigger ]
Image S/N Ratio: 11.8
Analysis Position: [ source = BAT ]
RA: 280.313549845198 Dec: -54.3595799473253 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 280.339542485094 Dec: -54.3430780907743 [deg; J2000]
{ 18h 41m 21.5s , -54d 20' 35.1" }
+/- 3.4657821618324 [arcmin] (estimated 90% radius based on SNR)
+/- 2.20061728779268 [arcmin] (formal 1-sigma fit error)
SNR: 5.15197467851014
Angular difference between the analysis and refined position is 1.344053 arcmin
Partial Coding Fraction: 0.71875 [ including projection effects ]
Duration
T90: 304.595999896526 +/- 15.0280336609888
Measured from: 0.200000047683716
to: 304.79599994421 [s; relative to TRIGTIME]
T50: 117.583999931812 +/- 104.658093173912
Measured from: 164.168000042439
to: 281.751999974251 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.271999955177307
to: 0.728000044822693 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.532000005245209
to: 319.800000011921 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.739598 1.574377 0.748659 0.172580
0.115527 0.113035 0.096214 0.085781 [error]
Peak 0.098932 0.123245 0.099734 0.018190
0.008858 0.009167 0.008112 0.005850 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 320.332 -0.532 319.800
T90 304.596 0.200 304.796
T50 117.584 164.168 281.752
Peak 1.000 -0.272 0.728
====== Spectral Analysis Summary =====================================
Model : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index : photon index: E^{Ph_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 both the PL model and CPL model
Nomr_90err : 90% error of the normalization
chi2 : Chi-Squared
dof : degree of freedo
=== Time-averaged spectral analysis ===
(Best model with acceptable fit: PL)
Model Ph_index Ph_90err_low Ph_90err_hi Epeak Epeak_90err_low Epeak_90err_hi Norm Nomr_90err_low Norm_90err_hi chi2 dof
PL -2.177 -0.181 0.172 - - - 6.70e-04 -7.79e-05 7.62e-05 53.250 57
CPL -1.975 1.975 0.558 5.251 N/A N/A 8.70e-04 N/A N/A 53.380 56
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: PL)
Model Ph_index Ph_90err_low Ph_90err_hi Epeak Epeak_90err_low Epeak_90err_hi Norm Nomr_90err_low Norm_90err_hi chi2 dof
PL -1.544 -0.136 0.134 - - - 2.24e-02 -1.84e-03 1.83e-03 58.800 57
CPL -1.258 -0.356 0.523 129.068 N/A N/A 3.14e-02 N/A N/A 57.740 56
=== 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 PL 5.20e-07 6.34e-07 5.61e-07 8.55e-07 2.01e-06 2.57e-06 erg/cm2
90%_error_low -6.13e-08 -5.34e-08 -8.97e-08 -2.44e-07 -1.99e-07 -3.52e-07 erg/cm2
90%_error_hi 6.28e-08 5.33e-08 9.22e-08 3.04e-07 2.04e-07 3.97e-07 erg/cm2
Peak flux PL 9.62e-01 9.44e-01 6.47e-01 6.98e-01 2.83e+00 3.25e+00 ph/cm2/s
90%_error_low -1.25e-01 -7.83e-02 -6.69e-02 -1.35e-01 -2.26e-01 -2.59e-01 ph/cm2/s
90%_error_hi 1.29e-01 7.79e-02 6.64e-02 1.54e-01 2.26e-01 2.60e-01 ph/cm2/s
Fluence CPL 5.18e-07 6.38e-07 5.61e-07 8.59e-07 2.01e-06 2.56e-06 erg/cm2
90%_error_low -6.23e-08 -1.48e-07 -8.99e-08 -1.68e-07 -1.97e-07 -1.99e-07 erg/cm2
90%_error_hi 7.07e-08 5.15e-08 9.31e-08 4.47e-07 2.22e-07 5.57e-07 erg/cm2
Peak flux CPL 9.18e-01 9.72e-01 6.64e-01 4.99e-01 2.80e+00 3.05e+00 ph/cm2/s
90%_error_low -1.45e-01 -9.09e-02 -7.28e-02 -2.12e-01 -2.30e-01 -3.23e-01 ph/cm2/s
90%_error_hi 1.48e-01 9.33e-02 7.44e-02 2.51e-01 2.31e-01 3.70e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 280.3395 -54.3431 0.0373 24.6767 -127.0068 0.9256070 5.152 TRIG_00684098 Foreground time interval of the image: -0.532 140.781 (delta_t = 141.313 [sec]) Background time interval of the image: -239.520 -0.532 (delta_t = 238.988 [sec])
Light Curves
Note: The mask-weighted lightcurves have units of either count/det or counts/sec/det, where a det is 0.4 x 0.4 = 0.16 sq cm.
Full-time range; 1 s binning
Other quick-look light curves:
- 64 ms binning (zoomed)
- 16 ms binning (zoomed)
- 8 ms binning (zoomed)
- 2 ms binning (zoomed)
- SN=5 or 10 s binning (full-time range)
- Raw light curve
Spectra
- 64 ms binning (zoomed)
- 16 ms binning (zoomed)
- 8 ms binning (zoomed)
- 2 ms binning (zoomed)
- SN=5 or 10 s binning (full-time range)
- Raw light curve
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) When the burst includes telescope slew time periods, the fitting uses an average response file made from multiple 5-s response files through out the slew time plus single time preiod for the non-slew times, and weighted by the total counts in the corresponding time period using addrmf. An average response file is needed becuase a spectral fit using 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.
Time averaged spectrum fit using the average DRM
Power-law model
Time interval is from -0.532 sec. to 319.800 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.17677 ( -0.180775 0.171632 ) Norm@50keV : 6.70337E-04 ( -7.79085e-05 7.62261e-05 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 53.25 using 59 PHA bins. # Reduced chi-squared = 0.9342 for 57 degrees of freedom # Null hypothesis probability = 6.165036e-01 Photon flux (15-150 keV) in 320.3 sec: 0.109649 ( -0.009081 0.009089 ) ph/cm2/s Energy fluence (15-150 keV) : 2.01278e-06 ( -1.9937e-07 2.03763e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.532 sec. to 319.800 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.21123 ( 1.99383 0.576839 ) Epeak [keV] : 258.943 ( ) Norm@50keV : 6.40787E-04 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 53.29 using 59 PHA bins. # Reduced chi-squared = 0.9516 for 56 degrees of freedom # Null hypothesis probability = 5.782096e-01 Photon flux (15-150 keV) in 320.3 sec: 0.109364 ( -0.009064 0.009866 ) ph/cm2/s Energy fluence (15-150 keV) : 2.00871e-06 ( -1.97004e-07 2.22125e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.272 sec. to 0.728 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.54388 ( -0.135831 0.134137 ) Norm@50keV : 2.24149E-02 ( -0.00183708 0.0018264 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 58.80 using 59 PHA bins. # Reduced chi-squared = 1.032 for 57 degrees of freedom # Null hypothesis probability = 4.092957e-01 Photon flux (15-150 keV) in 1 sec: 2.83267 ( -0.2263 0.22649 ) ph/cm2/s Energy fluence (15-150 keV) : 2.11232e-07 ( -1.87412e-08 1.88963e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.272 sec. to 0.728 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.2582 ( -0.356223 0.523176 ) Epeak [keV] : 129.068 ( ) Norm@50keV : 3.14208E-02 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 57.74 using 59 PHA bins. # Reduced chi-squared = 1.031 for 56 degrees of freedom # Null hypothesis probability = 4.106203e-01 Photon flux (15-150 keV) in 1 sec: 2.80362 ( -0.23 0.23138 ) ph/cm2/s Energy fluence (15-150 keV) : 2.07195e-07 ( -2.01225e-08 2.00582e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 304.596 sec. Hardness ratio (energy fluence ratio) = 0.88472865858
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 1.1539659e-06 S(50-150 keV) = 8.588082e-07
The dash-dotted line and the dashed line traces the fluences calculated from the Band function with Epeak = 15 and 150 keV, respectively. Both lines assume a canonical values of alpha = -1 and beta = -2.5.
Mask shadow pattern
IMX = -2.765502225343917E-01, IMY = 3.669045055672575E-01
Spacecraft aspect plot
Bright source in the pre-burst/pre-slew/post-slew images
Pre-burst image of 15-350 keV band
Time interval of the image: -239.520000 -0.532000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 170.2268 -60.6217 3.7 35.0 -2.8 1.0638 3.1 2.6 Cen X-3 186.6876 -62.7620 2.7 26.9 -3.4 1.1736 4.2 1.0 GX 301-2 245.0110 -15.6431 0.6 39.1 136.9 11.9425 18.8 1.8 Sco X-1 256.0123 -37.8485 1.6 20.8 170.5 1.7431 7.2 1.2 4U 1700-377 256.4063 -36.3391 3.2 22.3 169.2 0.9285 3.6 5.2 GX 349+2 262.9635 -24.7398 6.0 35.2 168.2 0.6507 1.9 2.5 GX 1+4 264.8177 -44.5039 4.2 20.2 -162.5 0.6815 2.7 4.6 4U 1735-44 270.3021 -25.1283 3.6 38.0 178.3 1.1496 3.2 3.1 GX 5-1 270.4101 -25.7797 3.3 37.5 179.0 1.1785 3.5 6.2 GRS 1758-258 274.1345 -14.0292 4.8 49.5 175.1 1.6192 2.4 7.5 GX 17+2 275.7275 -30.4418 0.0 36.3 -170.1 0.2783 0.9 11.2 H1820-303 284.9048 -25.0259 8.9 45.6 -165.3 -0.6543 -1.3 9.5 HT1900.1-2455 263.0084 -34.0321 153.0 27.1 177.2 -0.0202 -0.1 11.9 GX 354-0 218.5750 -17.6154 2.9 39.5 96.3 3.7469 3.9 ------ UNKNOWN 145.7294 -45.3628 2.8 55.5 3.7 4.2354 4.1 ------ UNKNOWN 141.2178 -48.6605 2.7 55.3 -1.8 3.4889 4.3 ------ UNKNOWN 132.6466 -60.2148 3.2 50.8 -16.5 1.7877 3.6 ------ UNKNOWN 313.0835 -50.5329 4.5 44.1 -117.1 2.9640 2.6 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.532000 140.780600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 170.1663 -60.6305 3.1 35.0 -2.8 -0.7530 -3.8 4.4 Cen X-3 186.8140 -62.7401 7.5 26.9 -3.4 -0.2907 -1.5 4.7 GX 301-2 245.0964 -15.5601 2.5 39.2 137.1 -1.8886 -4.7 8.3 Sco X-1 255.9554 -37.9211 4.5 20.7 170.5 -0.4384 -2.6 4.8 4U 1700-377 256.4437 -36.6247 0.0 22.0 169.6 0.2995 1.8 12.1 GX 349+2 263.0662 -24.6599 3.0 35.3 168.3 -0.8927 -3.9 6.0 GX 1+4 264.9390 -44.4925 7.0 20.3 -162.4 -0.2643 -1.6 8.8 4U 1735-44 270.4151 -25.0255 7.3 38.1 178.4 0.3994 1.6 7.8 GX 5-1 270.3913 -25.7566 5.1 37.5 179.0 -0.5499 -2.2 4.9 GRS 1758-258 273.9649 -14.0296 5.5 49.4 174.9 -0.8732 -2.1 2.4 GX 17+2 276.0804 -30.2716 56.5 36.6 -169.9 0.0430 0.2 9.9 H1820-303 285.0927 -24.7930 7.9 45.8 -165.3 0.4447 1.5 8.3 HT1900.1-2455 262.9410 -33.7693 8.3 27.3 176.8 0.2417 1.4 4.6 GX 354-0 285.9583 -52.5712 2.4 28.4 -128.1 0.8736 4.8 ------ UNKNOWN 112.4513 -58.1000 2.3 59.1 -24.5 5.0101 5.1 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 187.580590 962.511800 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 170.1714 -60.7145 461.8 52.3 24.3 0.0563 0.0 6.9 Cen X-3 186.3954 -62.8586 6.4 45.2 28.8 2.1514 1.8 8.9 GX 301-2 255.9752 -37.8480 2.0 23.4 113.8 4.5291 5.8 0.6 4U 1700-377 256.3159 -36.4003 3.7 24.4 116.5 2.5326 3.1 5.9 GX 349+2 262.8863 -24.7563 8.2 32.3 138.3 -1.3842 -1.4 6.7 GX 1+4 264.7924 -44.6227 12.3 13.9 116.8 0.5481 0.9 10.6 4U 1735-44 270.2304 -25.0581 2.6 30.2 150.6 3.5642 4.4 3.2 GX 5-1 270.3322 -25.7967 2.1 29.5 150.4 4.1572 5.4 3.6 GRS 1758-258 274.1395 -14.0290 5.0 40.6 159.7 2.7109 2.3 7.8 GX 17+2 276.0218 -30.3607 3.2 24.2 159.9 2.3015 3.6 5.0 H1820-303 285.1870 -24.8849 98.2 29.7 177.9 0.0824 0.1 8.5 HT1900.1-2455 262.9955 -33.9680 36.2 23.7 131.1 0.2336 0.3 8.0 GX 354-0 222.3120 -65.6766 2.2 29.8 33.5 3.8025 5.3 ------ UNKNOWN 277.5196 -31.5385 3.3 22.9 162.8 1.9957 3.5 ------ UNKNOWN 283.0435 -13.7761 2.8 40.6 173.0 3.6952 4.2 ------ UNKNOWN 203.1845 -86.1804 3.1 35.0 -4.6 2.9133 3.7 ------ UNKNOWN 78.7568 -68.1977 4.7 56.4 -20.6 7.6380 2.5 ------ UNKNOWN 308.8756 -1.3654 6.0 57.9 -156.8 8.5675 1.9 ------ UNKNOWN 325.4204 -21.4316 3.2 47.2 -127.1 13.3433 3.6 ------ UNKNOWN