Swift Observations of GRB 160221A

A. Melandri (INAF-OAB) for the Swift team

1. Introduction

Mereghetti et al. (GCN Circ. 19046) reported the GRB detection. A gamma ray burst lasting about 10 s has been detected by IBAS in the IBIS/ISGRI data at 23:49:42 UT of February 21, 2016. 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 did not observe this burst.

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.

XRT light curve

Figure 2. The XRT light curve. Any data from a crosshatched region are not included in the fit.

RA (J2000) Dec (J2000) Error Note Reference
15h28m21.68s -28°27'21.6" 2.6" XRT-final UKSSDC
15h28m21.48s -28°27'18.4" 4.1" XRT Melandri et al. GCN Circ. 19073

Table 1. Positions from the Swift instruments.

Band Authors GCN Circ. Subject Observatory Notes
Optical Buckley et al. 19049 MASTER-SAAO early observations Abastumani Astro. Obs.
Optical Bolmer et al. 19054 GROND upper limits GROND upper limits
Gamma-ray Mereghetti et al. 19046 A long GRB detected by INTEGRAL INTEGRAL Fluence=5x10-7erg cm-2
Gamma-ray Hui and Bissaldi 19056 Fermi GBM observation Fermi GBM Epeak=67±7 keV
T90=15 seconds
Fluence=1.55±0.14x10-6erg cm-2
(23rd percentile for long GRBs)

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

February 26, 2016