Swift Observations of GRB 171210A

D.N. Burrows (PSU) for the Swift team

1. Introduction

Bissaldi et al. (GCN Circ. 22228) reported the GRB detection. At 11:49:15.26 UT on December 10, 2017 Fermi-LAT detected high-energy emission from GRB 171210A, which was also detected by Fermi-GBM (trigger 534599360 / 171210493). Table 1 contains the best reported positions from Swift.

Table 2 is a summary of GCN Circulars about this GRB from observatories other than Swift.

2. BAT Observations and Analysis

BAT did not observe this burst.

3. XRT Observations and Analysis

XRT refined results are not available.

4. UVOT Observations and Analysis

Analysis of the UVOT data was reported by Burrows et al. (GCN Circ. 22235). 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. Table 3 gives preliminary magnitudes using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc., 1358, 373).

Figure 1. The BAT light curve is not available.

RA (J2000)	Dec (J2000)	Error	Note	Reference

Table 1. Positions from the Swift instruments.

Band	Authors	GCN Circ.	Subject	Observatory	Notes
Optical	Tyurina et al.	22238	MASTER-Net optical observations	MASTER
Gamma-ray	Bissaldi et al.	22228	Fermi-LAT detection	Fermi LAT
Gamma-ray	Poolakkil et al.	22233	Fermi GBM detection	Fermi GBM	Epeak=145±3 keV T90=143 seconds Fluence=7.33±0.08x10-5erg cm-2 (96.9 percentile for long GRBs)
Gamma-ray	Kozlova et al.	22244	Konus-Wind observation	Konus-Wind	Epeak=158 (-14,+16) keV Duration=~186.6 seconds Fluence=1.15(-0.10,+0.11)x10-4erg cm-2
Gamma-ray	Matsukawa et al.	22267	CALET Gamma-Ray Burst Monitor detection	CALET	T90=47.4±2.5 seconds

Table 2. Summary of GCN Circulars from other observatories sorted by band and then circular number.

Table 3. Found no UVOT observations.

December 23, 2017