Swift Observations of GRB 201216A

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

1. Introduction

Malacaria et al. (GCN Circ. 29072) reported the GRB detection. At 19:00:31.24 UT on 16 December 2020, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located GRB 201216A (trigger 629838036 / 201216792), which was also detected by the Swift/BAT (Tohuvavohu et al. 2020, GCN Circ. 29059) and initiated a Swift/XRT ToO (Evans 2020, GCN Circ. 29065). 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

Analysis of the initial XRT data was reported by Evans et al. (GCN Circ. 29137).

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
13h25m49.89s	+36°23'39.8"	3.0"	XRT	Evans et al. GCN Circ. 29137

Table 1. Positions from the Swift instruments.

Band	Authors	GCN Circ.	Subject	Observatory	Notes
Optical	Lipunov et al.	29060	Fermi GRB 201216A: Global MASTER-Net observations report	MASTER
Optical	Lipunov et al.	29062	Swift GRB201216.96: Global MASTER-Net observations report	MASTER
Gamma-ray	Fermi	29057	Fermi GBM Final Real-time Localization	Fermi GBM
Gamma-ray	Malacaria et al.	29072	Fermi GBM detection	Fermi GBM	Epeak=263±55 keV T90=25.6 seconds Fluence=2.343±0.330x10-6erg cm-2 (33rd percentile for long GRBs)

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

December 23, 2020