Swift Observations of GRB 190823A

E. Ambrosi (INAF-IASFPA) for the Swift team

1. Introduction

Iwakiri et al. (GCN Circ. 25456) reported the GRB detection. The MAXI/GSC nova alert system triggered a bright uncatalogued X-ray transient source at 13:30:22 UT on 2019 August 23. 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 D'Elia et al. (GCN Circ. 25680). The source previously reported by Ambrosi et al. (GCN Circ. 25476) is fading with 3-sigma significance, and is therefore likely the GRB afterglow. The source is fading with α >0.7.

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
18h38m44.97s	-43°31'40.4"	8.7"	XRT	D'Elia et al. GCN Circ. 25680

Table 1. Positions from the Swift instruments.

Band	Authors	GCN Circ.	Subject	Observatory	Notes
X-ray	Iwakiri et al.	25456	MAXI/GSC detection	MAXI	detection
Gamma-ray	Gaikwad et al.	25541	AstroSat CZTI detection	CZTI	T90=7.3 seconds

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

September 7, 2019