Swift Observations of GRB 160629A

A. D'Ai (INAF-IASFPA) and B.G. Balzer (PSU) for the Swift team

1. Introduction

Gotz et al. (GCN Circ. 19621) reported the GRB detection. A gamma ray burst lasting about 100 s has been detected by IBAS in the IBIS/ISGRI data at 22:19:30 UT of 2016 June 29. Table 1 contains the best reported positions from Swift.

Sokolov et al. (GCN Circ. 19623) reported the position from SAO RAS for the optical afterglow of this GRB. Castro-Tirado et al. (GCN Circ. 19632) determined a redshift of 3.332 from BTA. 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 began settled observations (Balzer and Markwardt GCN Circ. 19643) of the field of GRB 160629A 77035 s after the INTEGRAL trigger (Gotz et al., GCN Circ. 19621). No optical afterglow consistent with the optical position (Klotz et al., GCN Circ. 19622, Sokolov, et al. GCN Circ. 19623) or the XRT position (D’Ai’ et al., GCN Circ. 19641) is detected. 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 EB-V of 0.40 mag. in the direction of the GRB (Schlegel et al. 1998).

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
00h19m27.49s +76°58'01.8" 2.7" XRT-final UKSSDC
00h19m27.69s +76°58'01.3" 3.4" XRT D'Ai et al. GCN Circ. 19641

Table 1. Positions from the Swift instruments.

Band Authors GCN Circ. Subject Observatory Notes
Optical Klotz et al. 19622 TAROT Calern observatory optical
detection		 TAROT detection
Optical Sokolov et al. 19623 SAO RAS independent OT detection SAO RAS detection
Optical Castro-Tirado et al. 19632 BTA and GTC redshift BTA redshift
Optical Rebolo et al. 19638 Global MASTER Net Prompt OT observations MASTER light curve
Optical Mazaeva et al. 19646 AbAO optical observations Abastumani detection
Optical Mazaeva et al. 19669 AbAO optical observations Abastumani
Optical Mazaeva et al. 19670 Mondy optical observations Mondy detection
Radio Mooley et al. 19689 15 GHz detections and upper limits from
AMI		 AMI upper limits
Gamma-ray Gotz et al. 19621 a long GBB detected by INTEGRAL INTEGRAL Fluence=6.x10-6erg cm-2
Gamma-ray Toelge 19628 Fermi GBM observation Fermi GBM Epeak=295.50±19.30 keV
T90=66.6 seconds
Fluence=1.9±0.1x10-5erg cm-2
(86th percentile for long GRBs)
Gamma-ray Frederiks et al. 19635 Konus-Wind observation Konus-Wind Epeak=227 (-41,+41) keV
Fluence=1.5(-0.4,+0.6)x10-5erg cm-2

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

Filter Tstart(s) Tstop(s) Exp(s) Mag
u 77035 89233 2633 >21.4

Table 3. UVOT observation reported by Balzer and Markwardt (GCN Circ. 19643). The start and stop time of the exposure are given in seconds since the BAT trigger. The preliminary 3-σ upper limit is given. No correction has been made for extinction in the Milky Way.

July 13, 2016