GCN Circular 11490

Subject

GRB 101224A: Swift/UVOT Upper Limits

Event

Date

2010-12-24T17:38:45Z (15 years ago)

From

Wayne Landsman at GSFC/SSAI <wayne.b.landsman@nasa.gov>

W. Landsman (GSFC/Adnet) and H.A. Krimm (CRESST/NASA/USRA) report on 
behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 101224A 83 
s after the BAT trigger (Krimm et al., GCN Circ. 11484Loading...
 
 ).    No optical 
afterglow consistent with the XRT position   (Pagani et al., GCN Circ.  
11488Loading...
 
 )  is detected in the initial UVOT exposures.   Preliminary 3-sigma 
upper limits using the UVOT photometric system (Poole et al. 2008, 
MNRAS, 383, 627) for the first finding chart (FC) exposure and 
subsequent exposures are:

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

white_FC            83          233          147 > 20.8
u_FC               296          546          246 > 19.6
white               83         7201          659 > 21.9
v                  628        12647         1173 > 20.2
b                  551        24555         1030 > 21.4
u                  296        23977         1583 > 20.8
w1                 677        30339         1644 > 20.8
m2                 652        30016         2569 > 20.8
w2                 601        11734         1179 > 20.7

The values quoted above are not corrected for the Galactic extinction 
due to the reddening of E(B-V) = 0.05 in the direction of the burst 
(Schlegel et al. 1998).