Swift Observations of GRB 170209A

B. Mingo (U. Leicester) for the Swift team

1. Introduction

Roberts and Meegan (GCN Circ. 20652) reported the GRB detection. At 01:08:38.08 UT on the 9th of February 2017, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 170209A (trigger 508295323 / 170209048), for which MASTER reported an OT in follow-up observations of the reported GBM location region (Podesta et al. 2017, GCN Circ. 20650). Table 1 contains the best reported positions from Swift.

Schady et al. (GCN Circ. 20680) reported the position from GROND for the optical afterglow of this GRB. 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

UVOT results are not available.

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	Schady et al.	20680	GROND confirmation of MASTER afterglow	GROND	detection
Gamma-ray	Roberts and Meegan	20652	Fermi GBM Detection	Fermi GBM	Epeak=132±9 keV T90=40 seconds Fluence=9.34±0.37x10-6erg cm-2 (74th percentile for long GRBs)
Gamma-ray	Hurley et al.	20656	IPN Triangulation	IPN
Gamma-ray	Svinkin et al.	20659	Konus-Wind observation	Konus-Wind	Epeak=126 (-13,+18) keV Duration=~40 seconds Fluence=8.35(-0.69,+0.76)x10-6erg cm-2
Gamma-ray	Sharma et al.	20670	AstroSat CZTI detection	CZTI	T90=40.4 seconds

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

February 16, 2017