GCN Circular 32656

N. P. M. Kuin (UCL-MSSL) and S. Dichiara (PSU) report on behalf

of the Swift/UVOT team:


The Swift/UVOT began settled observations of the field of

GRB 221009 179 s after the BAT trigger (Dichiara et al.,

GCN Circ. 32632
Not found
 
 
, and 32633
Not found
 
 
).  This GRB was initially reported as being

a new bright hard X-ray transient and named SwiftJ1913.1+1946.

Further analysis shows this is a GRB (Kennea et al, GCN Circ.

32635
Not found
 
 
, and 32651
Not found
 
 
).

The  preliminary UVOT position was reported in the Dichiara et al. GCN.

The GRB was also detected by Fermi (Veres et al. GCN Circ 32636
Not found
 
 
;

Bissaldi et al. GCN Circ. 32637
Not found
 
 
; Lesage etal. GCN Circ. 32642
Not found
 
 
),

IPN (Svinkin et al.,  GCN Circ. 32641
Not found
 
 
); Agile (Ursi et al. GCN

Circ 32650
Not found
 
 
). A redshift of 0.151 has been reported by de Ugarte

Postigo et al. (GCN Circ. 32648
Not found
 
 
), and optical detections were

reported also (MASTER: Lipunov et al., GCN Circ. 32634
Not found
 
 
 and 32639
Not found
 
 
;

Liverpool Telescope photometry and spectrum: Perley GCN Circ

32638
Not found
 
 
;  VVS: Broens, GCN Circ. 32640
Not found
 
 
; BOOTES-2/TELMA: Hu et al., GCN

Circ. 32644
Not found
 
 
; Mondy: Belkin et al. GCN Circ. 32645
Not found
 
 
; MeerLICHT: de Wet et al.

GCN Circ. 32646
Not found
 
 
; Nanshan/NEXT photometry and Xinglong-2.16m

spectroscopy Xu et al. GCN Circ. 32647
Not found
 
 
; Al Khatim Observatory:

Odeh, GCN Circ. 32649
Not found
 
 
; REM: Brivio et al. GCN Circ. 32652
Not found
 
 
). Near IR

was reported for PRIME by Durbak et al. GCN Circ. 32654
Not found
 
 
 and radio

AMI-LA: Bright et al. GCN Circ. 32653
Not found
 
 
 and ATA:Farah et al.  GCN Circ. 32655
Not found
 
 
.

Pre-discovery limits from ZTF: Karambelkar et al. GCN Circ. 32643
Not found
 
 
.


Preliminary detections and 3-sigma upper limits using the UVOT photometric

system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early

exposures are:

Filter         T_start(s)   T_stop(s)      Exp(s)           Mag

white              179          329          147         16.68 +/- 0.03
v                  668          688           20         15.55 +/- 0.10
b                  593          613           20         17.05 +/- 0.11
u                  337          587          246         17.68 +/- 0.06
w1                 718         1293           58        >18.2
w2                 817         1219           39        >19.1

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 1.563 in the direction of the burst
(Schlegel et al. 1998).