Gamma-ray Burst 170210A

(All information courtesy of the instrument teams.)

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Results of Observations

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Fri 10 Feb 17 02:48:03 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      47
TRIGGER_NUM:     508387661
GRB_RA:          171.517d {+11h 26m 04s} (J2000),
                 171.712d {+11h 26m 51s} (current),
                 170.948d {+11h 23m 48s} (1950)
GRB_DEC:         -59.583d {-59d 34' 59"} (J2000),
                 -59.678d {-59d 40' 38"} (current),
                 -59.308d {-59d 18' 28"} (1950)
GRB_ERROR:       25.02 [deg radius, statistical plus systematic]
GRB_INTEN:       60 [cnts/sec]
DATA_SIGNIF:     5.10 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        17794 TJD;    41 DOY;   17/02/10
GRB_TIME:        10056.58 SOD {02:47:36.58} UT
GRB_PHI:         103.00 [deg]
GRB_THETA:       100.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.59
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      95%  GRB
2nd_MOST_LIKELY:   4%  Generic Transient
DETECTORS:       0,0,1, 0,0,0, 0,0,0, 0,1,0, 0,0,
SUN_POSTN:       323.93d {+21h 35m 44s}  -14.32d {-14d 19' 03"}
SUN_DIST:        102.67 [deg]   Sun_angle= 10.1 [hr] (West of Sun)
MOON_POSTN:      131.93d {+08h 47m 44s}  +15.82d {+15d 48' 58"}
MOON_DIST:        82.06 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      292.31,  1.52 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      208.73,-55.18 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2017/bn170210116/quicklook/glg_lc_medres34_bn170210116.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 231.88,-25.57 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Fri 10 Feb 17 02:48:14 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      65
TRIGGER_NUM:     508387661
GRB_RA:          230.283d {+15h 21m 08s} (J2000),
                 230.768d {+15h 23m 04s} (current),
                 228.885d {+15h 15m 32s} (1950)
GRB_DEC:         -74.467d {-74d 28' 00"} (J2000),
                 -74.527d {-74d 31' 37"} (current),
                 -74.286d {-74d 17' 09"} (1950)
GRB_ERROR:       12.97 [deg radius, statistical plus systematic]
GRB_INTEN:       97 [cnts/sec]
DATA_SIGNIF:     7.20 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        17794 TJD;    41 DOY;   17/02/10
GRB_TIME:        10056.58 SOD {02:47:36.58} UT
GRB_PHI:          77.00 [deg]
GRB_THETA:       100.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.70
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      95%  GRB
2nd_MOST_LIKELY:   3%  Generic Transient
DETECTORS:       0,0,1, 0,0,0, 0,0,0, 0,1,0, 0,0,
SUN_POSTN:       323.93d {+21h 35m 44s}  -14.32d {-14d 19' 03"}
SUN_DIST:         77.05 [deg]   Sun_angle= 6.2 [hr] (West of Sun)
MOON_POSTN:      131.94d {+08h 47m 45s}  +15.82d {+15d 48' 56"}
MOON_DIST:       107.58 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      312.61,-14.48 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      253.35,-53.32 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2017/bn170210116/quicklook/glg_lc_medres34_bn170210116.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 231.88,-25.57 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Fri 10 Feb 17 02:48:17 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      56
TRIGGER_NUM:     508387661
GRB_RA:          168.240d {+11h 12m 58s} (J2000),
                 168.428d {+11h 13m 43s} (current),
                 167.692d {+11h 10m 46s} (1950)
GRB_DEC:         -58.170d {-58d 10' 11"} (J2000),
                 -58.263d {-58d 15' 47"} (current),
                 -57.898d {-57d 53' 51"} (1950)
GRB_ERROR:       9.59 [deg radius, statistical only]
DATA_SIGNIF:     5.10 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        17794 TJD;    41 DOY;   17/02/10
GRB_TIME:        10056.58 SOD {02:47:36.58} UT
GRB_PHI:         105.00 [deg]
GRB_THETA:        99.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4153 (Gnd S/W Version number)
SUN_POSTN:       323.93d {+21h 35m 44s}  -14.32d {-14d 19' 02"}
SUN_DIST:        104.68 [deg]   Sun_angle= 10.4 [hr] (West of Sun)
MOON_POSTN:      131.94d {+08h 47m 45s}  +15.82d {+15d 48' 56"}
MOON_DIST:        79.92 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      290.23,  2.25 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      204.87,-55.31 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2017/bn170210116/quicklook/glg_lc_medres34_bn170210116.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_508387661.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The LC_URL file will not be created/available until ~15 min after the trigger.  
COMMENTS:        The POS_MAP_URL file will not be created/available until ~1.5 min after the notice.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Fri 10 Feb 17 02:48:40 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      86
TRIGGER_NUM:     508387661
GRB_RA:          219.067d {+14h 36m 16s} (J2000),
                 219.437d {+14h 37m 45s} (current),
                 217.994d {+14h 31m 58s} (1950)
GRB_DEC:         -68.267d {-68d 16' 00"} (J2000),
                 -68.340d {-68d 20' 25"} (current),
                 -68.049d {-68d 02' 55"} (1950)
GRB_ERROR:       5.22 [deg radius, statistical plus systematic]
GRB_INTEN:       755 [cnts/sec]
DATA_SIGNIF:     30.80 [sigma]
INTEG_TIME:      1.024 [sec]
GRB_DATE:        17794 TJD;    41 DOY;   17/02/10
GRB_TIME:        10056.58 SOD {02:47:36.58} UT
GRB_PHI:          82.00 [deg]
GRB_THETA:       100.00 [deg]
DATA_TIME_SCALE: 1.0240 [sec]
HARD_RATIO:      0.60
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      95%  GRB
2nd_MOST_LIKELY:   4%  Generic Transient
DETECTORS:       0,0,1, 0,0,0, 0,0,0, 0,1,0, 0,0,
SUN_POSTN:       323.93d {+21h 35m 44s}  -14.32d {-14d 19' 02"}
SUN_DIST:         81.93 [deg]   Sun_angle= 7.0 [hr] (West of Sun)
MOON_POSTN:      131.94d {+08h 47m 46s}  +15.81d {+15d 48' 54"}
MOON_DIST:       103.76 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      312.42, -7.35 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      243.77,-49.41 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2017/bn170210116/quicklook/glg_lc_medres34_bn170210116.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 231.88,-25.57 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Fri 10 Feb 17 02:48:50 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      90
TRIGGER_NUM:     508387661
GRB_RA:          220.150d {+14h 40m 36s} (J2000),
                 220.515d {+14h 42m 04s} (current),
                 219.091d {+14h 36m 22s} (1950)
GRB_DEC:         -67.100d {-67d 05' 59"} (J2000),
                 -67.173d {-67d 10' 20"} (current),
                 -66.886d {-66d 53' 07"} (1950)
GRB_ERROR:       3.93 [deg radius, statistical plus systematic]
GRB_INTEN:       1530 [cnts/sec]
DATA_SIGNIF:     87.20 [sigma]
INTEG_TIME:      2.048 [sec]
GRB_DATE:        17794 TJD;    41 DOY;   17/02/10
GRB_TIME:        10056.58 SOD {02:47:36.58} UT
GRB_PHI:          82.00 [deg]
GRB_THETA:       100.00 [deg]
DATA_TIME_SCALE: 2.0480 [sec]
HARD_RATIO:      0.48
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      95%  GRB
2nd_MOST_LIKELY:   4%  Generic Transient
DETECTORS:       0,0,1, 0,0,0, 0,0,0, 0,1,0, 0,0,
SUN_POSTN:       323.93d {+21h 35m 44s}  -14.32d {-14d 19' 02"}
SUN_DIST:         81.91 [deg]   Sun_angle= 6.9 [hr] (West of Sun)
MOON_POSTN:      131.94d {+08h 47m 46s}  +15.81d {+15d 48' 53"}
MOON_DIST:       104.00 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      313.28, -6.45 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      243.50,-48.19 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2017/bn170210116/quicklook/glg_lc_medres34_bn170210116.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 231.88,-25.57 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN Circular #20660
O.J. Roberts (USRA/NASA) and B. Mailyan (UAH) report on behalf of the Fermi GBM Team:
"At 02:47:36.58 UT on February 10th 2017, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 170210A (trigger 508387661 / 170210116). The on-ground calculated location using the GBM trigger data is,
RA = 232.56, DEC = -58.59 (J2000 degrees), equivalent to J2000 15h 30m, -58d 35',
with an uncertainty of 1 degree (radius, 1-sigma containment, statistical only; there is additionally a systematic error which we have characterized as a core-plus-tail model, with 90% of GRBs having a 3.7 deg. error and a small tail suffering a larger than 10 deg. systematic error [Connaughton et al. 2015, ApJS, 216, 32]).
The initial angle from the Fermi-LAT boresight to the GBM ground-location is 109 degrees.
The GBM light curve shows a long burst with multiple episodes of bright emission over a duration (T90) of about 79 s (50-300 keV). The time-averaged spectrum from T0+9 s to T0+84 s is best fit by a Band function with alpha= -0.90 +/- 0.02, beta= -2.28 +/- 0.08 and Epeak is 361.5 +/- 14.1 keV.
The event fluence (10-1000 keV) in this time interval is (1.10 +/- 0.2) E-04 erg/cm^2. The 1s peak photon flux measured starting from T0+41.7 s in the 10-1000 keV band is 32.8 +/- 0.6 ph/s/cm^2.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN Circular #20661
K. Hurley, on behalf of the IPN,
I. G. Mitrofanov, D. Golovin, M. L. Litvak, and A. B. Sanin, on behalf of the HEND-Odyssey GRB team,
D. Svinkin, S. Golenetskii, R. Aptekar, D. Frederiks, A. Kozlova, and T. Cline on behalf of the Konus-Wind team,
V. Connaughton, M. S. Briggs, C. Meegan, V. Pelassa, and A. Goldstein, on behalf of the Fermi GBM team,
S. Barthelmy, J. Cummings, N. Gehrels, H. Krimm, and D. Palmer, on behalf of the Swift-BAT team,
and
W. Boynton, C. Fellows, K. Harshman, H. Enos, and R. Starr, on behalf of the GRS-Odyssey GRB team, report:
The long-duration GRB 170210A (Roberts and Mailyan, GCN Circ. 20660) has been detected by Fermi(GBM), Konus-Wind, Mars-Odyssey (HEND), and Swift (BAT), so far, at about 10056 s UT (02:47:36). The burst was outside the coded field of view of the BAT.
We have triangulated it to a preliminary, 3 sigma error box whose coordinates are:
```
   ---------------------------------------------
    RA(2000), deg                 Dec(2000), deg
   ---------------------------------------------
   Center:
    226.055 (15h 04m 13s) -65.101 (-65d 06' 02")
   Corners:
    228.764 (15h 15m 03s) -63.914 (-63d 54' 51")
    228.302 (15h 13m 12s) -64.342 (-64d 20' 31")
    223.147 (14h 52m 35s) -66.193 (-66d 11' 35")
    223.706 (14h 54m 49s) -65.801 (-65d 48' 04")
   ---------------------------------------------
```
The error box area is 1731 sq. arcmin, and its maximum dimension is 3.28 deg (the minimum one is 10.1 arcmin). The Sun distance was 80 deg.
This box may be improved.
A triangulation map is posted at http://www.ioffe.ru/LEA/GRBs/GRB170210_T10092/IPN
The Konus-Wind time history and spectrum will be given in a forthcoming GCN Circular.
GCN Circular #20665
Y.H. Wang (IHEP), M.Z. Feng (IHEP), Y. Zhao (IHEP), report on behalf of the POLAR collaboration:
At 2017-02-10T02:47:37 UT (T0), during a routine on-ground search of data, POLAR detected the long-duration GRB 170210A, which was also reported by the Fermi/GBM (O.J. Roberts et al, GCN Circ. 20660) and IPN Triangulation(K. Hurley et al, GCN Circ. 20661), and also detected by Konus-Wind.
The POLAR light curve shows a long burst consists of multiple peaks, with a duration (T90) of 62.27 s measured from T0+13.12 s. The 1-s peak rate measured from T0+41.0 s is 6673.75cnts/s. The total counts is about 106099 cnts. LC_URL: http://polar.ihep.ac.cn/grb/2017/02/GRB170210A/lc/POLAR_lc_grb170210A.png
The above results are not dead time corrected. The above measurements are in the energy range of about 20-500 keV.
Using the best location from the IPN Triangulation, which is (J2000):
```
RA:     226.055   [deg]
Dec:    -65.101   [deg]
Err:    1731      [sq. arcmin](3 sigma)
```
the incident angle in POLAR coordinate at T0 is:
```
theta:  80.6      [deg]
phi:    130.9     [deg]
```
The Minimum Detectable Polarization(MDP) for this burst is estimated to be ~7.3% [1-sigma, statistical only].
All analysis results presented above are preliminary.
POLAR is a dedicated Gamma-Ray Burst polarimeter (50-500 keV) on-board the Chinese space laboratory Tiangong-2 launched on Sep 15,2016. More information about POLAR can be found at http://polar.ihep.ac.cn/en/ , http://isdc.unige.ch/polar/ and http://polar.psi.ch/pub/.
GCN Circular #20668
D. Svinkin, S. Golenetskii, R. Aptekar, D. Frederiks, P. Oleynik, M. Ulanov, A. Tsvetkova, A. Lysenko, A.Kozlova, and T. Cline on behalf of the Konus-Wind team, report:
The long-duration, bright GRB 170210A (Fermi-GBM detection: Roberts and Mailyan, GCN Circ. 20660; IPN Triangulation: Hurley et al., GCN Circ. 20661; POLAR detection: Wang et al., GCN Circ. 20665) triggered Konus-Wind at T0=10092.18 s UT (02:48:12.180).
The burst light curve shows a multipeaked structure which starts at ~T0-41 s and has a total duration of ~124 s. The emission is seen up to ~10 MeV.
The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB170210_T10092/
As observed by Konus-Wind, the burst had a fluence of 1.40(-0.16,+0.16)x10^-4 erg/cm2, and a 64-ms peak flux, measured from T0+7.152 s, of 1.83(-0.33,+0.33)x10^-5 erg/cm2/s (both in the 20 keV - 10 MeV energy range).
The time-averaged spectrum of the burst (measured from T0 to T0+86.528 s) is best fit in the 20 keV - 15 MeV range by the GRB (Band) model with the following parameters: the low-energy photon index alpha = -0.99(-0.06,+0.07), the high energy photon index beta = -2.55(-0.68,+0.26), the peak energy Ep = 392(-40,+45) keV (chi2 = 105/97 dof)
The spectrum near the maximum count rate (measured from T0+5.888 to T0+7.680 s) is best fit in the 20 keV - 15 MeV range by the GRB (Band) model with the following parameters: the low-energy photon index alpha = -0.63(-0.14,+0.17), the high energy photon index beta = -2.30(-0.39,+0.21), the peak energy Ep = 410(-76,+90) keV (chi2 = 70/65 dof)
All the quoted errors are at the 90% confidence level. All the quoted values are preliminary.

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Jochen Greiner, last update: 13-Feb-2017 [Disclaimer]