Swift Observations of GRB 131011A

1. Introduction

Jenke (GCN Circ. 15331) reported the GRB detection. At 17:47:34.99 UT on October 11 2013, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 131011A (trigger 403206457/131011741). 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

The Swift/UVOT began observations of the field of GRB 131011A starting 83.9 ks after the Fermi trigger 403206457 (Kasliwal et al., GCN Circ. 15324) (Hagen and Page GCN Circ. 15343). No optical afterglow consistent with the PTF position is detected in the initial UVOT exposures. Table 3 gives preliminary magnitudes using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc., 1358, 373). No correction has been made for the expected extinction in the Milky Way corresponding to a reddening of E_B-V of 0.02 mag. in the direction of the GRB (Schlegel et al. 1998).

Figure 1. The BAT light curve is not available.

RA (J2000)	Dec (J2000)	Error	Note	Reference
02h10m06.11s	-04°24'42.5"	4.2"	XRT-final	UKSSDC
02h10m06.12s	-04°24'42.1"	4.1"	XRT	GCN Circ. 15329

Table 1. Positions from the Swift instruments.

Band	Authors	GCN Circ.	Subject	Observatory	Notes
Optical	Sudilovsky et al.	15328	GROND afterglow observations	GROND	detection
Optical	Volnova et al.	15341	Fermi 403206457 / GRB 131011A: AAO optical observations	Abastumani
Radio	Hancock et al.	15395	ATCA 34GHz upper limit	ATCA	upper limits
Gamma-ray	Jenke	15331	Fermi GBM detection	Fermi GBM	Epeak = 220 ± 30 keV

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

Filter	Tstart(s)	Tstop(s)	Exp(s)	Mag
w2	83920	97601	4896	>22.10

Table 3. UVOT observation reported by Hagen and Page (GCN Circ. 15343). The start and stop time of the exposure are given in seconds since the BAT trigger. The preliminary 3-σ upper limit is given. No correction has been made for extinction in the Milky Way.