Swift Observations of GRB 131209A

D. Grupe (PSU) for the Swift team

1. Introduction

Vianello and Omodei (GCN Circ. 15587) reported the GRB detection. At 13:07:56.97on December 9, 2013, Fermi LAT detected a faint high energy signal from GRB131209A, which was also detected by Fermi-GBM (trigger 408287279/131209547). 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 results are not available.

3. XRT Observations and Analysis

XRT 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
09h07m19.20s	-33°51'20.0"	5.3"	XRT	GCN Circ. 15592

Table 1. Positions from the Swift instruments.

Band	Authors	GCN Circ.	Subject	Observatory	Notes
Gamma-ray	Vianello and Omodei	15587	Fermi-LAT detection of a burst	Fermi LAT	detection
Gamma-ray	Hurley et al.	15588	IPN Triangulation	IPN
Gamma-ray	Golenetskii et al.	15589	Konus-Wind observation	Konus-Wind	Epeak = 235 ± 29 keV
Gamma-ray	von Kienlin and Meegan	15591	Fermi GBM observation	Fermi GBM	Epeak = 287 (+12/-11) keV

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

Filter	Tstart(hrs)	Tstop(hrs)	Exp(s)	Mag
white	33.16	33.37	754	>21.8
v	33.37	33.60	801	>20.1
u	32.94	34.78	1367	>21.1

Table 3. UVOT observations reported by Grupe and Breeveld (GCN Circ. 15592). The start and stop times of the exposures are given in seconds since the BAT trigger. The preliminary 3-σ upper limits are given. No correction has been made for extinction in the Milky Way.

January 5, 2014