Swift Observations of GRB 220909A

M. Capalbi (INAF-IASFPA) for the Swift team

1. Introduction

Raman et al. (GCN Circ. 32543) reported the GRB detection. Swift/BAT did not localize GRB 220909A onboard (T0: 2022-09-09T06:52:13 UTC, Fermi/GBM GCN Circ. 32539). 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 refined results are not available.

3. XRT Observations and Analysis

Analysis of the initial XRT data was reported by Capalbi et al. (GCN Circ. 32547). One uncatalogued X-ray source has been detected consistent with being within 296 arcsec of the Swift/BAT-GUANO position (Raman et al. GCN Circ. 32543), it is below the RASS limit and shows no definitive signs of fading.

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
14h24m10.75s	-08°51'18.4"	3'	BAT-GUANO	Raman et al. GCN Circ. 32543

Table 1. Positions from the Swift instruments.

Band	Authors	GCN Circ.	Subject	Observatory	Notes
Gamma-ray	Fermi	32539	Fermi GBM Final Real-time Localization	Fermi GBM
Gamma-ray	Malacaria and Meegan	32556	Fermi GBM observation	Fermi GBM	Epeak=154±25 keV T90=14.6 seconds Fluence=1.4±0.1x10-6erg cm-2 (brighter than 21% of long GRBs)

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

September 15, 2022