Gamma-ray Burst 171210A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

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Results of Observations

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sun 10 Dec 17 11:49:40 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      44
TRIGGER_NUM:     534599360
GRB_RA:          338.800d {+22h 35m 12s} (J2000),
                 339.004d {+22h 36m 01s} (current),
                 338.232d {+22h 32m 56s} (1950)
GRB_DEC:         +35.633d {+35d 37' 60"} (J2000),
                 +35.726d {+35d 43' 35"} (current),
                 +35.374d {+35d 22' 27"} (1950)
GRB_ERROR:       11.97 [deg radius, statistical plus systematic]
GRB_INTEN:       177 [cnts/sec]
DATA_SIGNIF:     9.10 [sigma]
INTEG_TIME:      1.024 [sec]
GRB_DATE:        18097 TJD;   344 DOY;   17/12/10
GRB_TIME:        42555.26 SOD {11:49:15.26} UT
GRB_PHI:          78.00 [deg]
GRB_THETA:        40.00 [deg]
DATA_TIME_SCALE: 1.0240 [sec]
HARD_RATIO:      0.36
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      84%  GRB
2nd_MOST_LIKELY:  13%  Cyg X-1
DETECTORS:       0,1,0, 0,0,0, 0,0,0, 1,0,0, 0,0,
SUN_POSTN:       257.62d {+17h 10m 29s}  -22.95d {-22d 56' 53"}
SUN_DIST:         96.64 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:      172.44d {+11h 29m 45s}   +6.27d {+06d 16' 07"}
MOON_DIST:       136.15 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:       94.06,-19.49 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      357.14, 40.65 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2017/bn171210493/quicklook/glg_lc_medres34_bn171210493.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 75.20,25.47 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sun 10 Dec 17 11:49:49 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      58
TRIGGER_NUM:     534599360
GRB_RA:          339.083d {+22h 36m 20s} (J2000),
                 339.288d {+22h 37m 09s} (current),
                 338.515d {+22h 34m 03s} (1950)
GRB_DEC:         +35.600d {+35d 36' 00"} (J2000),
                 +35.693d {+35d 41' 36"} (current),
                 +35.340d {+35d 20' 26"} (1950)
GRB_ERROR:       4.22 [deg radius, statistical plus systematic]
GRB_INTEN:       1072 [cnts/sec]
DATA_SIGNIF:     107.40 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        18097 TJD;   344 DOY;   17/12/10
GRB_TIME:        42555.26 SOD {11:49:15.26} UT
GRB_PHI:          78.00 [deg]
GRB_THETA:        40.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.56
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      93%  GRB
2nd_MOST_LIKELY:   4%  Generic Transient
DETECTORS:       0,1,0, 0,0,0, 0,0,0, 1,0,0, 0,0,
SUN_POSTN:       257.62d {+17h 10m 29s}  -22.95d {-22d 56' 53"}
SUN_DIST:         96.84 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:      172.44d {+11h 29m 45s}   +6.27d {+06d 16' 05"}
MOON_DIST:       136.25 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:       94.25,-19.64 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      357.38, 40.51 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2017/bn171210493/quicklook/glg_lc_medres34_bn171210493.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 75.20,25.47 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sun 10 Dec 17 11:50:41 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      2
TRIGGER_NUM:     534599360
GRB_RA:          338.400d {+22h 33m 36s} (J2000),
                 338.609d {+22h 34m 26s} (current),
                 337.818d {+22h 31m 16s} (1950)
GRB_DEC:         +29.610d {+29d 36' 36"} (J2000),
                 +29.703d {+29d 42' 11"} (current),
                 +29.352d {+29d 21' 06"} (1950)
GRB_ERROR:       1.22 [deg radius, statistical only]
DATA_SIGNIF:     82.20 [sigma]
DATA_INTERVAL:   7.168 [sec]
GRB_DATE:        18097 TJD;   344 DOY;   17/12/10
GRB_TIME:        42555.26 SOD {11:49:15.26} UT
GRB_PHI:          77.00 [deg]
GRB_THETA:        46.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41531 (Gnd S/W Version number)
SUN_POSTN:       257.62d {+17h 10m 29s}  -22.95d {-22d 56' 53"}
SUN_DIST:         93.89 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:      172.45d {+11h 29m 47s}   +6.27d {+06d 15' 56"}
MOON_DIST:       141.65 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:       90.24,-24.37 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      353.15, 35.49 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2017/bn171210493/quicklook/glg_lc_medres34_bn171210493.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_534599360.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        In the LAT Field-of-view.  
COMMENTS:        Bright hard burst in the GBM.  
COMMENTS:        This is likely a Long GRB.  
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:     Sun 10 Dec 17 11:50:41 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      2
TRIGGER_NUM:     534599360
GRB_RA:          338.400d {+22h 33m 36s} (J2000),
                 338.609d {+22h 34m 26s} (current),
                 337.818d {+22h 31m 16s} (1950)
GRB_DEC:         +29.610d {+29d 36' 36"} (J2000),
                 +29.703d {+29d 42' 11"} (current),
                 +29.352d {+29d 21' 06"} (1950)
GRB_ERROR:       1.22 [deg radius, statistical only]
DATA_SIGNIF:     82.20 [sigma]
DATA_INTERVAL:   7.168 [sec]
GRB_DATE:        18097 TJD;   344 DOY;   17/12/10
GRB_TIME:        42555.26 SOD {11:49:15.26} UT
GRB_PHI:          77.00 [deg]
GRB_THETA:        46.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41531 (Gnd S/W Version number)
SUN_POSTN:       257.62d {+17h 10m 29s}  -22.95d {-22d 56' 53"}
SUN_DIST:         93.89 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:      172.45d {+11h 29m 47s}   +6.27d {+06d 15' 56"}
MOON_DIST:       141.65 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:       90.24,-24.37 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      353.15, 35.49 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2017/bn171210493/quicklook/glg_lc_medres34_bn171210493.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_534599360.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        In the LAT Field-of-view.  
COMMENTS:        Bright hard burst in the GBM.  
COMMENTS:        This is likely a Long GRB.  
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:     Sun 10 Dec 17 11:50:41 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      2
TRIGGER_NUM:     534599360
GRB_RA:          338.400d {+22h 33m 36s} (J2000),
                 338.609d {+22h 34m 26s} (current),
                 337.818d {+22h 31m 16s} (1950)
GRB_DEC:         +29.610d {+29d 36' 36"} (J2000),
                 +29.703d {+29d 42' 11"} (current),
                 +29.352d {+29d 21' 06"} (1950)
GRB_ERROR:       1.22 [deg radius, statistical only]
DATA_SIGNIF:     82.20 [sigma]
DATA_INTERVAL:   7.168 [sec]
GRB_DATE:        18097 TJD;   344 DOY;   17/12/10
GRB_TIME:        42555.26 SOD {11:49:15.26} UT
GRB_PHI:          77.00 [deg]
GRB_THETA:        46.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41531 (Gnd S/W Version number)
SUN_POSTN:       257.62d {+17h 10m 29s}  -22.95d {-22d 56' 53"}
SUN_DIST:         93.89 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:      172.45d {+11h 29m 47s}   +6.27d {+06d 15' 56"}
MOON_DIST:       141.65 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:       90.24,-24.37 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      353.15, 35.49 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2017/bn171210493/quicklook/glg_lc_medres34_bn171210493.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_534599360.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        In the LAT Field-of-view.  
COMMENTS:        Bright hard burst in the GBM.  
COMMENTS:        This is likely a Long GRB.  
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:     Sun 10 Dec 17 11:50:41 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      2
TRIGGER_NUM:     534599360
GRB_RA:          338.400d {+22h 33m 36s} (J2000),
                 338.609d {+22h 34m 26s} (current),
                 337.818d {+22h 31m 16s} (1950)
GRB_DEC:         +29.610d {+29d 36' 36"} (J2000),
                 +29.703d {+29d 42' 11"} (current),
                 +29.352d {+29d 21' 06"} (1950)
GRB_ERROR:       1.22 [deg radius, statistical only]
DATA_SIGNIF:     82.20 [sigma]
DATA_INTERVAL:   7.168 [sec]
GRB_DATE:        18097 TJD;   344 DOY;   17/12/10
GRB_TIME:        42555.26 SOD {11:49:15.26} UT
GRB_PHI:          77.00 [deg]
GRB_THETA:        46.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41531 (Gnd S/W Version number)
SUN_POSTN:       257.62d {+17h 10m 29s}  -22.95d {-22d 56' 53"}
SUN_DIST:         93.89 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:      172.45d {+11h 29m 47s}   +6.27d {+06d 15' 56"}
MOON_DIST:       141.65 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:       90.24,-24.37 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      353.15, 35.49 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2017/bn171210493/quicklook/glg_lc_medres34_bn171210493.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_534599360.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        In the LAT Field-of-view.  
COMMENTS:        Bright hard burst in the GBM.  
COMMENTS:        This is likely a Long GRB.  
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:     Sun 10 Dec 17 17:06:32 UT
NOTICE_TYPE:     Fermi-LAT Offline Position
TRIGGER_NUM:     534599360     
GRB_RA:          335.310d {+22h 21m 14s} (J2000),
                 335.521d {+22h 22m 05s} (current),
                 334.723d {+22h 18m 53s} (1950)
GRB_DEC:         +24.440d {+24d 26' 24"} (J2000),
                 +24.531d {+24d 31' 51"} (current),
                 +24.188d {+24d 11' 16"} (1950)
GRB_ERROR:       10.20 [arcmin radius, 90% containment, statistical only]
GRB_DATE:        18097 TJD;   344 DOY;   17/12/10
GRB_TIME:        42555.26 SOD {11:49:15.26} UT
TRIGGER_ID:      0x20000000
MISC:            0x40000000
SUN_POSTN:       257.86d {+17h 11m 27s}  -22.97d {-22d 58' 01"}
SUN_DIST:         89.03 [deg]   Sun_angle= -5.2 [hr] (East of Sun)
MOON_POSTN:      175.21d {+11h 40m 50s}   +5.32d {+05d 19' 25"}
MOON_DIST:       144.52 [deg]
MOON_ILLUM:      46 [%]
GAL_COORDS:       84.42,-26.98 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      347.44, 32.06 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi LAT Offline position.
COMMENTS:        This Notice was ground-generated -- not flight-generated.
COMMENTS:        It is the result of human-in-the-loop processing.
COMMENTS:        This is a human generated position of a LAT ground detection.
COMMENTS:        This source corresponds to GBM trigger 171012493.

GCN Circular #22228
E. Bissaldi (Politecnico & INFN Bari), F. Longo (Univ & INFN Trieste) and D. Kocevski (MSFC) report=A0on behalf of the Fermi-LAT team:
"At 11:49:15.26 UT on December 10, 2017 Fermi-LAT detected high-energy emission from GRB 171210A,=A0which was also detected by Fermi-GBM (trigger 534599360 / 171210493).
The best LAT on-ground location is found to be
RA, Dec =3D 335.29, 24.44 (J2000)
with an error radius of 0.15 deg (90 % containment, statistical error only).=A0
This was 50 deg from the LAT boresight at the time of the trigger=A0and triggered an autonomous repoint of the spacecraft.
The data from the Fermi-LAT show a significant increase in the event rate that is spatially correlated with the trigger with high significance.=A0
The highest-energy photon is a 12=A0GeV=A0event which is observed=A01400=A0= seconds after the GBM trigger.
A Swift ToO has been requested for this burst.
The Fermi-LAT point of contact for this burst is Elisabetta Bissaldi (Elisabetta.Bissaldi@ba.infn.it).
The Fermi-LAT is a pair conversion telescope designed to cover the energy band from 20 MeV to greater than 300 GeV. It is the product of an international collaboration between NASA and DOE in the U.S. and many scientific institutions across France, Italy, Japan and Sweden."
GCN Circular #22232
P. A. Evans (U. Leicester) reports on behalf of the Swift team:
Swift has initiated a ToO observation of the Fermi/LAT GRB 171210A. Automated analysis of the XRT data will be presented online at http://www.swift.ac.uk/ToO_GRBs/00020785
Any uncatalogued X-ray sources detected in this analysis will be reported on this website and via GCN COUNTERPART notices. These are not necessarily related to the Fermi/LAT event. Any X-ray source considered to be a probable afterglow candidate will be reported via a GCN Circular after manual consideration.
Details of the XRT automated analysis methods are detailed in Evans et al. (2007, A&A, 469, 379; 2009, MNRAS, 397, 1177 and 2014, ApJS, 210, 8).
This circular is an official product of the Swift-XRT team.
GCN Circular #22233
S. Poolakkil (UAH), C. Meegan (UAH) and A. von Kienlin (MPE) report on behalf of the Fermi GBM Team:
"At 11:49:15.26 UT on 10 December 2017, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 171210A (trigger 534599360 / 171210493) which was also detected by the Fermi LAT (E. Bissaldi et al. 2017, GCN 22228). The GBM on-ground location is consistent with the LAT position.
The trigger resulted in an Autonomous Repoint Request (ARR) by the GBM Flight Software owing to the high peak flux of the GRB. This ARR was accepted and the spacecraft slewed to the GBM in-flight location. The initial angle from the Fermi LAT boresight to the best location is 51 degrees.
The GBM light curve consists of a single bright peak with a duration (T90) of about 143 s (50-300 keV). The time-averaged spectrum from T0-1.02 s to T0+103.42 s is best fit by a Band function with Epeak= 145 +/- 3 keV, alpha = -0.65 +/- 0.02 and beta = -2.34 +/- 0.05.
The event fluence (10-1000 keV) in this time interval is (7.33 +/- 0.08)E-05 erg/cm^2. The 1-sec peak photon flux measured starting from T0+6.46 s in the 10-1000 keV band is 16.7 +/- 0.36 ph/s/cm^2.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN Circular #22235
D.N. Burrows (PSU), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester), V. D'Elia (ASDC), A. D'Ai (INAF-IASFPA), A. Melandri (INAF-OAB), A. Tohuvavohu (PSU), S. J. LaPorte (PSU), P.A. Evans (U. Leicester), P. D'Avanzo (INAF-OAB) and N. P. M. Kuin (UCL-MSSL) report on behalf of the Swift team:
Swift-XRT has performed follow-up observations of the Fermi/LAT-detected burst GRB 171210A (Bissaldi et al. GCN Circ. 22228),
collecting 5.0 ks of Photon Counting (PC) mode data between T0+34.7 ks and T0+46.3 ks.
Five uncatalogued X-ray sources have been detected, however none of them is above the RASS limit or shows definitive signs of fading. Therefore, at the present time we cannot identify which, if any, is the
afterglow. Details of these sources are given below:
Source 1:
```
  RA (J2000.0):  335.26545  =  22:21:3.71
  Dec (J2000.0): +24.47028  =  +24:28:13.0
  Error: 2.9 arcsec (radius, 90% conf. [Enhanced position])
  Count-rate: (7.5 [+1.5, -1.4])e-3 ct s^-1   
  Distance: 182 arcsec from Fermi/LAT position.
  Flux: (2.20 [+0.45, -0.41])e-13 erg cm^-2 s^-1 (observed, 0.3-10 keV)
```
This source lies 5.0" away from SDSS J222103.88+242817.4, which is catalogued as a candidate quasar (Brescia et al., 2015, MNRAS, 450, 3893).
Source 2:
```
  RA (J2000.0):  335.2458  =  22:20:58.99
  Dec (J2000.0): +24.6016  =  +24:36:05.7
  Error: 5.7 arcsec (radius, 90% conf.)
  Count-rate: (2.23 [+0.98, -0.76])e-3 ct s^-1	 
  Distance: 618 arcsec from Fermi/LAT position.
  Flux: (2.44 [+1.07, -0.83])e-14 erg cm^-2 s^-1 (observed, 0.3-10 keV)
```
This source lies 6.4" away from SDSS J222058.65+243610.1, which is catalogued as a candidate quasar (Brescia et al., 2015, MNRAS, 450, 3893).
Source 3:
```
  RA (J2000.0):  335.4135  =  22:21:39.23
  Dec (J2000.0): +24.5534  =  +24:33:12.4
  Error: 7.0 arcsec (radius, 90% conf.)
  Count-rate: (3.01 [+1.11, -0.90])e-3 ct s^-1	 
  Distance: 530 arcsec from Fermi/LAT position.
  Flux: (8.4 [+3.1, -2.5])e-14 erg cm^-2 s^-1 (observed, 0.3-10 keV)
```
This source lies 2.6" away from SDSS J222139.19+243314.9, which is catalogued as a candidate quasar (Brescia et al., 2015, MNRAS, 450, 3893).
Source 4:
```
  RA (J2000.0):  335.42877  =  22:21:42.90
  Dec (J2000.0): +24.30996  =  +24:18:35.9
  Error: 2.4 arcsec (radius, 90% conf. [Enhanced position])
  Count-rate: 0.0137 +/- 0.0022 ct s^-1   
  Distance: 608 arcsec from Fermi/LAT position.
  Flux: (4.08 [+0.66, -0.64])e-13 erg cm^-2 s^-1 (observed, 0.3-10 keV)
```
This source lies 1.3" away from SDSS J222142.87+241837.0, which is catalogued as a candidate quasar (Brescia et al., 2015, MNRAS, 450, 3893).
Source 5:
```
  RA (J2000.0):  335.37378  =  22:21:29.71
  Dec (J2000.0): +24.49242  =  +24:29:32.7
  Error: 2.3 arcsec (radius, 90% conf. [Enhanced position])
  Count-rate: (8.8 [+1.9, -1.8])e-3 ct s^-1   
  Distance: 281 arcsec from Fermi/LAT position.
  Flux: (3.00 [+0.65, -0.63])e-13 erg cm^-2 s^-1 (observed, 0.3-10 keV)
```
This source lies 1.7" away from SDSS J222129.58+242933.1, which is catalogued as a candidate quasar (Brescia et al., 2015, MNRAS, 450, 3893).
The results of the XRT-team automatic analysis of the XRT observations,
including a position-specific upper limit calculator, are available at http://www.swift.ac.uk/ToO_GRBs/00020785.
Simultaneous with the XRT, the UVOT observed the target region of GRB 171210A. Due to the smaller field of view, two of the candidate sources (#2 and #4) are not on the UVOT image. The other candidate regions have been examined but do not show any new sources. A further comparison of the whole UVOT observation to the DSS survey shows no new sources.
We acknowledge the use of the VizieR catalogue access tool, CDS, Strasbourg, France.
This circular is an official product of the Swift team.
GCN Circular #22238
N.Tyurina, V. Lipunov, E. Gorbovskoy,V.Kornilov, D.Kuvshinov, A.V.Krylov, I.Gorbunov, P.Balanutsa, A.Kuznetsov, V.V.Chazov, D. Vlasenko Lomonosov Moscow State University, Sternberg Astronomical Institut of MSU
R.Podesta, C.Lopez, F. Podesta Observatorio Astronomico Felix Aguilar (OAFA), National University of San Juan, Argentina
H. Levato, C. Saffe Instituto de Ciencias Astronomicas,de la Tierra y del Espacio (ICATE), San Juan, Argentina
D.Buckley, S. Potter, A.Kniazev, M.Kotze South African Astronomical Observatory
R. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres The Instituto de Astrofisica de Canarias
O.Gres, K.Ivanov, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev, V.A.Poleshchuk, Irkutsk State University
V.Yurkov, Yu.Sergienko Blagoveschensk Educational State University, Blagoveschensk
A. Tlatov, V.Senik, A.V. Parhomenko, D. Dormidontov Kislovodsk Solar Station of the Pulkovo Observatory
MASTER-IAC robotic telescope (http://observ.pereplet.ru) started Fermi LAT GRB171210A (Bissaldi et al. GCN 22228, t_trigger=2017-12-10 11:49:15.26UT, RA, Dec = 335.29, 24.44 (J2000), 0.15deg (90%) stat.err.rad.) inspection at 2017-12-10 19:08:16UT (07h19m00.7s after trigger time) just after sunset.
The unfiltered mlim on the single images is 20.4 (180s exposition), and on the sum is 21m.
MASTER auto-detection System (Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) didn't find optical counterpart.
http://observ.pereplet.ru/images/MASTERGRB171210AFermi.jpg
Observations were made on zenit distance = 14 degrees, galaxy latitude b = -27 degree.
```
Dist. to Moon: 144.183815
Moon coord.: (176.084576 d, 5.105187 d
Lunar disk: 0.451595
Lunar phase: 95.555548
The sun  altitude  is -12.79
```
This message can be cited.
GCN Circular #22244
A.Kozlova, S. Golenetskii, R. Aptekar, D. Frederiks, P. Oleynik, M. Ulanov, D. Svinkin, A. Tsvetkova, A. Lysenko, and T. Cline on behalf of the Konus-Wind team, report:
The long-duration GRB 171210A (Fermi-LAT detection: Bissaldi et al., GCN 22228, Fermi-GBM observation: Poolakkil et al., GCN 22233) triggered Konus-Wind at T0=42556.704 s UT (11:49:16.704).
The burst light curve shows a single pulse started at ~T0-6.1 s with a total duration of ~186.6 s. The emission is seen up to ~10 MeV.
As observed by Konus-Wind, the burst had a fluence of 1.15(-0.10,+0.11)x10^-4 erg/cm2, and a 64-ms peak flux, measured from T0+2.816 s, of 7.85(-1.73,+1.79)x10^-6 erg/cm2/s (both in the 20 keV - 10 MeV energy range).
The time-averaged spectrum of the burst (measured from T0 to T0+140.544 s) is best fit in the 20 keV - 10 MeV range by the GRB (Band) model with the following parameters: the low-energy photon index alpha = -0.76(-0.13,+0.15), the high energy photon index beta = -2.42(-0.21,+0.14), the peak energy Ep = 158(-14,+16) keV (chi2 = 99/88 dof)
The spectrum near the maximum count rate (measured from T0+0.256 to T0+5.376 s) is best fit in the 20 keV - 10 MeV range by the GRB (Band) model with the following parameters: the low-energy photon index alpha = -0.64(-0.09,+0.11), the high energy photon index beta = -2.83(-1.36,+0.40), the peak energy Ep = 426(-46,+46) keV (chi2 = 70/79 dof)
The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB171210_T42556/
All the quoted errors are at the 90% confidence level. All the quoted values are preliminary.
GCN Circular #22261
P. D=E2=80=99Avanzo, A. Melandri (INAF-OAB) and P.A. Evans (U. Leicester) report on behalf of the Swift team:
Swift-XRT has performed a second epoch of observations of the Fermi/LAT-detected burst GRB 171210A (Bissaldi et al. GCN Circ. 22228), collecting 4.4 ks of Photon Counting (PC) mode data between T0+563.0 ks and T0+662.2 ks. None of the five XRT-detected sources reported in Burrows at al. (GCN Circ. 22235) show any sign of significant fading between the two epochs of observation. We conclude that we have not detected the GRB afterglow. This circular is an official product of the Swift-XRT team.
GCN Circular #22267
S. Matsukawa, A. Yoshida, T. Sakamoto, V. Pal'shin, Y. Kawakubo, M. Moriyama, Y. Yamada, A. Tezuka (AGU), K. Yamaoka (Nagoya U), S. Nakahira (RIKEN), I. Takahashi (IPMU), Y. Asaoka, S. Ozawa, S. Torii (Waseda U), Y. Shimizu, T. Tamura (Kanagawa U), W. Ishizaki (ICRR), M. L. Cherry (LSU), S. Ricciarini (U of Florence), A. V. Penacchioni, P. S. Marrocchesi (U of Siena) and the CALET collaboration:
The long-duration GRB 171210A (Bissaldi et al., GCN circ. 22228; Poolakkil et al., GCN circ. 22233; Kozlova et al., GCN circ. 22244) triggered the CALET Gamma-ray Burst Monitor (CGBM) at 11:49:17.22 on 10 December 2017. The burst signal was seen by all the instruments. Because of a problem in one of the ground alert processing scripts, the GCN notice was not distributed automatically for this event.
The light curve of the SGM shows a single FRED-like pulse. The emission starts at T-5 sec, peaks at T+5 sec and ends at T+50 sec. The T90 duration measured by the SGM data is 47.4 +- 2.5 sec (40-1000 keV).
The emission is seen up to ~T+180 s in the low energy ranges of the HXM data.
The ground processed light curve is available at
http://cgbm.calet.jp/cgbm_trigger/ground/1196941607/
The CALET data used in this analysis are provided by the Waseda CALET Operation Center located at the Waseda University.

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Jochen Greiner, last update: 23-Dec-2017 [Disclaimer]