A.P. Beardmore (U. Leicester) and M.H. Siegel (PSU) for the Swift team
Hurley et al. (GCN Circ. 15888) reported the GRB detection. Table 1 contains the best reported positions from Swift.
Cenko et al. (GCN Circ. 15883) reported the position from iPTF for the optical afterglow of this GRB. Table 2 is a summary of GCN Circulars about this GRB from observatories other than Swift.
BAT did not observe this burst.
XRT results are not available.
Analysis of the UVOT data was reported by Siegel et al. (GCN Circ. 15894). Swift/UVOT started observations of GRB140226A/iPTF14yb (Cenko et al., GCN Circ. 15833) 25718 s after the IPN trigger (Hurley et al., GCN Circ. 15888). No optical counterpart is detected at the position of the iPTF or XRT positions (Beardmore et al., GCN Circ. 15884) in summed exposures. 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 0.02 mag. in the direction of the GRB (Schlegel et al. 1998).
Figure 1. The BAT light curve is not available.
Figure 2. The XRT light curve.
Any data from a cross-hatched region are not included in the fit.
RA (J2000) | Dec (J2000) | Error | Note | Reference |
---|---|---|---|---|
14h45m58.06s | +14°59'38.5" | 3.9" | XRT-final | UKSSDC |
14h45m58.03s | +14°59'38.3" | 3.7" | XRT | Beardmore et al. GCN Circ. 15884 |
Band | Authors | GCN Circ. | Subject | Observatory | Notes |
---|---|---|---|---|---|
Optical | Cenko et al. | 15883 | iPTF14yb: iPTF Discovery of an Optical Afterglow-like Transient |
iPTF | detection |
Optical | Cucchiara et al. | 15886 | iPTF14yb: RATIR Optical and NIR Observations of the optical transient |
RATIR | detection |
Optical | Varela et al. | 15887 | PTF14yb: GROND Transient Detection | GROND | detection |
Optical | Hurley et al. | 15888 | IPN triangulation of GRB 140226A, a possible GRB counterpart to iPTF14yb |
iPTF | possible detection |
Optical | Cucchiara et al. | 15892 | iPTF14yb: RATIR Optical and NIR Observations |
RATIR | detection |
Optical | Volnova et al. | 15893 | iPTF14yb: Mondy optical observations | Mondy | |
Optical | Gorosabel et al. | 15895 | iPTF14yb: 1.23m CAHA observations | CAHA | |
Optical | Volnova et al. | 16037 | iPTF14yb: Mondy optical observations | Mondy | |
Gamma-ray | Golenetskii et al. | 15889 | Konus-Wind observation | Konus-Wind | Epeak=414±79 keV Fluence=5.6±1.1x10-6erg cm-2 |
Filter | Tstart(s) | Tstop(s) | Exp(s) | Mag |
---|---|---|---|---|
uvm2 | 25718 | 43672 | 2180 | >21.24 |
v | 124093 | 136265 | 4877 | >20.96 |
v | 147705 | 154552 | 1822 | >20.54 |
Table 3. UVOT observations reported by Siegel et al. (GCN Circ. 15894). The start and stop times of the exposures are given in seconds since the BAT trigger. The preliminary 3-σ upper limits are given. No correction has been made for extinction in the Milky Way.
March 26, 2014