Swift Observations of GRB 210626A

M. Perri (SSDC and INAF-OAR) for the Swift team

1. Introduction

Tohuvavohu et al. (GCN Circ. 30325) reported the GRB detection. Swift/BAT did not trigger on GRB 210626A (T0: 2021-06-26 08:16:15.9 UTC, Fermi/GBM GCN Circ. 30323). 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 refined results are not available.

3. XRT Observations and Analysis

Analysis of the initial XRT data was reported by D'Aì and Tohuvavohu (GCN Circ. 30341).

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

14^h46^m05.95^s -01°09'21.4" 5.5" XRT-final UKSSDC

14^h46^m05.83^s -01°09'22.5" 5.7" XRT Perri et al. GCN Circ. 30329

14^h46^m28.78^s -01°09'04.3" 5' BAT-GUANO Tohuvavohu et al. GCN Circ. 30325

Table 1. Positions from the Swift instruments.

Band Authors GCN Circ. Subject Observatory Notes

Optical Lipunov et al. 30327 Fermi GRB 210626A: Global MASTER-Net
observations report MASTER

Optical Kumar et al. 30336 GIT optical upper limit GROWTH-India Tel. upper limits

Optical Jelinek et al. 30337 Ondrejov D50 optical limit D50 upper limits

Optical Hu et al. 30339 CAHA 2.2m telescope optical limit CAHA upper limits

Gamma-ray Fermi 30323 Fermi GBM Final Real-time Localization Fermi GBM

Gamma-ray von Kienlin and Meegan 30340 Fermi GBM observation Fermi GBM E_peak=86±18 keV
T₉₀=34 seconds
Fluence=5.1±0.4x10^-6erg cm^-2
(57^th percentile for long GRBs)

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

RA (J2000)	Dec (J2000)	Error	Note	Reference
14^h46^m05.95^s	-01°09'21.4"	5.5"	XRT-final	UKSSDC
14^h46^m05.83^s	-01°09'22.5"	5.7"	XRT	Perri et al. GCN Circ. 30329
14^h46^m28.78^s	-01°09'04.3"	5'	BAT-GUANO	Tohuvavohu et al. GCN Circ. 30325

Band	Authors	GCN Circ.	Subject	Observatory	Notes
Optical	Lipunov et al.	30327	Fermi GRB 210626A: Global MASTER-Net observations report	MASTER
Optical	Kumar et al.	30336	GIT optical upper limit	GROWTH-India Tel.	upper limits
Optical	Jelinek et al.	30337	Ondrejov D50 optical limit	D50	upper limits
Optical	Hu et al.	30339	CAHA 2.2m telescope optical limit	CAHA	upper limits
Gamma-ray	Fermi	30323	Fermi GBM Final Real-time Localization	Fermi GBM
Gamma-ray	von Kienlin and Meegan	30340	Fermi GBM observation	Fermi GBM	E_peak=86±18 keV T₉₀=34 seconds Fluence=5.1±0.4x10^-6erg cm^-2 (57^th percentile for long GRBs)

July 13, 2021