Swift Observations of GRB 140110A

A. Maselli (INAF-IASFPA) and D. Xu (DARK/NBI) for the Swift team

1. Introduction

Bissaldi et al. (GCN Circ. 15714) reported the GRB detection. Starting at 06:18:37.94 on January 10th, 2014, Fermi LAT detected high energy emission from GRB 140110A, which was also detected by Fermi-GBM (trigger 411027520). Table 1 contains the best reported positions from Swift.

Xu (GCN Circ. 15719) reported the detection with UVOT of an optical afterglow. 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

XRT results are not available.

4. UVOT Observations and Analysis

The Swift/UVOT observed the error circle of the Fermi/LAT GRB 140110A (Bissaldi et al., GCN Circ. 15714) in a series of u band observations tiled on the sky (Oates and Stamatikos GCN Circ. 15724). The total exposure time is 12.7 ks spread over 7 fields; each field was observed typically for 1.8 ks. 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 0.01 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

01^h57^m11.98^s -36°17'48.2" 0.6" UVOT-refined Oates and Stamatikos GCN Circ. 15724

01^h54^m19.99^s -36°29'43.9" 5.2" XRT-final UKSSDC

01^h55^m46.76^s -36°25'50.8" 6.2" XRT GCN Circ. 15721

Table 1. Positions from the Swift instruments.

Band Authors GCN Circ. Subject Observatory Notes

Gamma-ray Bissaldi et al. 15714 Fermi-LAT detection of a burst Fermi LAT detection

Gamma-ray von Kienlin and Connaughton 15716 Fermi GBM observation Fermi GBM E_peak = 1550 (+300/-250) keV

Gamma-ray Hurley et al. 15725 IPN Triangulation IPN

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

RA (J2000)	Dec (J2000)	Error	Note	Reference
01^h57^m11.98^s	-36°17'48.2"	0.6"	UVOT-refined	Oates and Stamatikos GCN Circ. 15724
01^h54^m19.99^s	-36°29'43.9"	5.2"	XRT-final	UKSSDC
01^h55^m46.76^s	-36°25'50.8"	6.2"	XRT	GCN Circ. 15721

Band	Authors	GCN Circ.	Subject	Observatory	Notes
Gamma-ray	Bissaldi et al.	15714	Fermi-LAT detection of a burst	Fermi LAT	detection
Gamma-ray	von Kienlin and Connaughton	15716	Fermi GBM observation	Fermi GBM	E_peak = 1550 (+300/-250) keV
Gamma-ray	Hurley et al.	15725	IPN Triangulation	IPN

Table 3. Found no UVOT observations.

January 23, 2014