Swift Observations of GRB 130821A

K.L. Page (U. Leicester) for the Swift team

1. Introduction

Kocevski et al. (GCN Circ. 15115) reported the GRB detection. At 16:10:28.011 UT on 21 Aug 2013, Fermi-LAT detected high energy emission from GRB 130821A, which was also detected by Fermi-GBM (trigger 398794231/130821674 -- GCN Circ. 15113). 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

We have analysed xx ks of XRT data for the Fermi/LAT-detected burst: GRB 130821A, from 0 s to 0 s after the Fermi/LAT trigger. The data are entirely in Photon Counting (PC) mode. We cannot determine at the present time whether the source is fading.

4. UVOT Observations and Analysis

UVOT results are not available.

Figure 1. The BAT light curve is unavailable.

RA (J2000) Dec (J2000) Error Note Reference
20h56m38.44s -12°02'36.53" XRT Page et al. GCN Circ. 15123

Table 1. Positions from the Swift instruments.

Band Authors GCN Circ. Subject Observatory Notes
Optical Xu et al. 15124 Weihai optical upper limit Weihai upper limits
Gamma-ray Jenke 15113 Fermi GBM Detection Fermi GBM Epeak = 165 ± 5 keV
Gamma-ray Kocevski et al. 15115 Fermi-LAT detection of a burst Fermi LAT detection
Gamma-ray Golenetskii et al. 15125 Konus-Wind observation Konus-Wind Epeak = 260 ± 47 keV
Gamma-ray Hurley et al. 15127 IPN triangulation IPN
Gamma-ray Hurley et al. 15132 IPN triangulation IPN

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

August 30, 2013