Swift Observations of GRB 200517A

B. Sbarufatti (PSU) for the Swift team

1. Introduction

Niwano et al. (GCN Circ. 27750) reported the GRB detection. The MAXI/GSC nova alert system triggered a bright uncatalogued X-ray transient source at 11:27:21 UT . 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

Analysis of the initial XRT data was reported by Gropp (GCN Circ. 27775).

We provide an update on the XRT light curve (Figure 2) evolution of the candidate X-ray afterglow of GRB 200517A (GCN Circ. 27750).

4. UVOT Observations and Analysis

UVOT results are not available.

Figure 1. The BAT light curve is not available.

XRT light curve

Figure 2. The XRT light curve. Any data from a crosshatched region are not included in the fit.

RA (J2000) Dec (J2000) Error Note Reference

01^h10^m47.61^s -50°55'20.7" 3.3" XRT Sbarufatti et al. GCN Circ. 27754

Table 1. Positions from the Swift instruments.

Band Authors GCN Circ. Subject Observatory Notes

X-ray Niwano et al. 27750 MAXI/GSC detection MAXI detection

Gamma-ray Fletcher 27758 Fermi GBM Sub-Threshold Detection Fermi GBM

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

RA (J2000)	Dec (J2000)	Error	Note	Reference
01^h10^m47.61^s	-50°55'20.7"	3.3"	XRT	Sbarufatti et al. GCN Circ. 27754

Band	Authors	GCN Circ.	Subject	Observatory	Notes
X-ray	Niwano et al.	27750	MAXI/GSC detection	MAXI	detection
Gamma-ray	Fletcher	27758	Fermi GBM Sub-Threshold Detection	Fermi GBM

May 22, 2020