Table 2: Main characteristics of the three selected short-event light curves; d is the projected distance from the centre of M 31.
C3 C4 C5

$\alpha$ (J2000) $\rm00^h42^m12.5^s$ $\rm00^h42^m25.6^s$ $\rm00^h41^m52.8^s$

$\delta$ (J2000) $41^\circ21'30''$ $41^\circ 26' 27''$ $41^\circ 17' 18''$

d 8'01'' 10'53'' 9'45''

$\chi^2/\textrm{d.o.f.}$ 2.90 2.32 2.47

${\rm d}w_R$ 2.48 2.01 1.78

${\rm d}w_I$ 1.62 2.23 1.92

t_1/2 (days) $16 \pm 2$ $13 \pm 2$ $14\pm 2$

$R_{\rm max}$ $21.0 \pm 0.1$ $21.3 \pm 0.1$ $21.8\pm 0.1$

R-I $2.2\pm 0.2$ $1.1 \pm 0.2$ $0.5\pm 0.2$

INT data inconclusive inconclusive no extension

**Table 2:** Main characteristics of the three selected short-event light curves; d is the projected distance from the centre of M 31.
	C3	C4	C5
$\alpha$ (J2000)	$\rm00^h42^m12.5^s$	$\rm00^h42^m25.6^s$	$\rm00^h41^m52.8^s$
$\delta$ (J2000)	$41^\circ21'30''$	$41^\circ 26' 27''$	$41^\circ 17' 18''$
d	8'01''	10'53''	9'45''
$\chi^2/\textrm{d.o.f.}$	2.90	2.32	2.47
${\rm d}w_R$	2.48	2.01	1.78
${\rm d}w_I$	1.62	2.23	1.92
t_1/2 (days)	$16 \pm 2$	$13 \pm 2$	$14\pm 2$
$R_{\rm max}$	$21.0 \pm 0.1$	$21.3 \pm 0.1$	$21.8\pm 0.1$
R-I	$2.2\pm 0.2$	$1.1 \pm 0.2$	$0.5\pm 0.2$
INT data	inconclusive	inconclusive	no extension

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