Swift Observations of GRB 171010A

A. D'Ai (INAF-IASFPA) and A.A. Breeveld (UCL-MSSL) for the Swift team

1. Introduction

Omodei et al. (GCN Circ. 21985) reported the GRB detection. Table 1 contains the best reported positions from Swift.

Thorstensen and Halpern (GCN Circ. 21987) reported the position for the optical afterglow of this GRB. Breeveld and Siegel (GCN Circ. 22004) reported the detection with UVOT of an optical afterglow. Kankare et al. (GCN Circ. 22002) determined a redshift of 0.33 from PESSTO, and de Ugarte Postigo et al. (GCN Circ. 22096) determined a redshift of 0.33 from VLT. 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

The Swift/UVOT began settled observations (Breeveld and Siegel GCN Circ. 22004) of the field of GRB 171010A 69338 s after the LAT trigger (Omodei et al., GCN Circ. 21985). A afterglow (Thorstensen and Halpern, GCN Circ. 21987, Izzo and Malesani, GCN Circ. 21988, Guidorzi et al., GCN Circ. 21991, Malesani et al., GCN Circ. 22000, Harita et al., GCN Circ. 22001) is detected in the initial UVOT exposures. Table 3 gives preliminary magnitudes using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc., 1358, 373). No correction has been made for the expected extinction in the Milky Way corresponding to a reddening of E_B-V of 0.15 mag. in the direction of the GRB (Schlegel et al. 1998).

Figure 1. The BAT light curve is not available.

RA (J2000) Dec (J2000) Error Note Reference

04^h26^m19.47^s -10°27'46.0" 0.50" UVOT ?

04^h26^m19.42^s -10°27'47.7" 1.4" XRT D'Ai et al. GCN Circ. 21989

Table 1. Positions from the Swift instruments.

Band Authors GCN Circ. Subject Observatory Notes

Optical Izzo and Malesani 21988 optical observations iTelescope

Optical Guidorzi et al. 21991 LCO 1m telescope observations LCO detection

Optical Malesani et al. 22000 NOT optical observations NOT detection

Optical Harita et al. 22001 MITSuME Akeno Optical Observation MITSuME Akeno detection

Optical Kankare et al. 22002 ePESSTO NTT spectroscopic redshift PESSTO redshift

Optical Watson et al. 22011 RATIR Optical and NIR Observations RATIR detection

Optical Kumar et al. 22012 Optical observations from HCT Himalayan Chandra Telescope detection

Optical de Ugarte Postigo et al. 22096 VLT spectroscopic identification of the
associated SN 2017htp VLT

Optical Mazaeva et al. 22113 afterglow and SN 2017htp optical
observations Mondy detection

Radio Horesh et al. 22013 A detection of a radio source by AMI AMI detection

Radio Laskar et al. 22014 VLA Detection VLA detection

Radio Horesh et al. 22015 VLA Observations VLA

Gamma-ray Omodei et al. 21985 Fermi-LAT detection Fermi LAT E_max=7 GeV

Gamma-ray Sharma et al. 21990 AstroSat CZTI detection CZTI T₉₀=70.3 seconds

Gamma-ray Poolakkil and Meegan 21992 Fermi GBM observation Fermi GBM E_peak=154±1 keV
T₉₀=104 seconds

Gamma-ray Frederiks et al. 22003 Konus-Wind observation Konus-Wind E_peak=171 (-6,+7) keV
Duration=~155 seconds
Fluence=6.5±0.2x10^-4erg cm^-2

Other Thorstensen and Halpern 21987 OT, spectrum, and possible host galaxy

Other Cucchiara and Strolger 22107 possible SN component

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

Filter T_start(s) T_stop(s) Exp(s) Mag

white 69338 80991 4818 18.84 ą 0.02

RA (J2000)	Dec (J2000)	Error	Note	Reference
04^h26^m19.47^s	-10°27'46.0"	0.50"	UVOT	?
04^h26^m19.42^s	-10°27'47.7"	1.4"	XRT	D'Ai et al. GCN Circ. 21989

Band	Authors	GCN Circ.	Subject	Observatory	Notes
Optical	Izzo and Malesani	21988	optical observations	iTelescope
Optical	Guidorzi et al.	21991	LCO 1m telescope observations	LCO	detection
Optical	Malesani et al.	22000	NOT optical observations	NOT	detection
Optical	Harita et al.	22001	MITSuME Akeno Optical Observation	MITSuME Akeno	detection
Optical	Kankare et al.	22002	ePESSTO NTT spectroscopic redshift	PESSTO	redshift
Optical	Watson et al.	22011	RATIR Optical and NIR Observations	RATIR	detection
Optical	Kumar et al.	22012	Optical observations from HCT	Himalayan Chandra Telescope	detection
Optical	de Ugarte Postigo et al.	22096	VLT spectroscopic identification of the associated SN 2017htp	VLT
Optical	Mazaeva et al.	22113	afterglow and SN 2017htp optical observations	Mondy	detection
Radio	Horesh et al.	22013	A detection of a radio source by AMI	AMI	detection
Radio	Laskar et al.	22014	VLA Detection	VLA	detection
Radio	Horesh et al.	22015	VLA Observations	VLA
Gamma-ray	Omodei et al.	21985	Fermi-LAT detection	Fermi LAT	E_max=7 GeV
Gamma-ray	Sharma et al.	21990	AstroSat CZTI detection	CZTI	T₉₀=70.3 seconds
Gamma-ray	Poolakkil and Meegan	21992	Fermi GBM observation	Fermi GBM	E_peak=154±1 keV T₉₀=104 seconds
Gamma-ray	Frederiks et al.	22003	Konus-Wind observation	Konus-Wind	E_peak=171 (-6,+7) keV Duration=~155 seconds Fluence=6.5±0.2x10^-4erg cm^-2
Other	Thorstensen and Halpern	21987	OT, spectrum, and possible host galaxy
Other	Cucchiara and Strolger	22107	possible SN component

Filter	T_start(s)	T_stop(s)	Exp(s)	Mag
white	69338	80991	4818	18.84 ą 0.02

Table 3. UVOT observation reported by Breeveld and Siegel (GCN Circ. 22004). The start and stop time of the exposure are given in seconds since the BAT trigger. The preliminary detection is given. No correction has been made for extinction in the Milky Way.

November 10, 2017