The ASM has detected a new gamma-ray burst. The event began at about 09:10:40 UTC on 26 Jan 2001. It appears to be singly-peaked and to have lasted around 20 seconds. It was detected in a single camera. Here is the background-subtracted light curve, in Crab flux units.

From the position histogram data, an error box could be derived that is 1.5 degrees long and 3.5 arcminutes wide. There are no sources in the ASM catalog near this localization. The center of the error box is at R.A. = 11h 55m 11s, Decl. = +49d 15' 11" (J2000.0).

The corners of this box are:

179.4482d{11h57m48s}49.8633d{49o51'48"}
179.3926d{11h57m34s}49.8870d{49o53'13"}
178.1519d{11h52m36s}48.6408d{48o38'27"}
178.2054d{11h52m49s}48.6182d{48o37'06"}

Kevin Hurley reports that this burst was detected weakly with Ulysses, and a preliminary analysis using the RXTE/ASM light curve as part of the IPN indicates that the burst came from the northern part of the ASM error box, above a declination of about 49° 20'. If the burst was also detected by NEAR and/or Konus/WIND, this localization may be refined considerably.

After a detection with Konus/WIND, an IPN annulus was calculated through triangulation of the bursts as seen by Konus and Ulysses. Below, we show a close-up of the region of intersection between this annulus and the RXTE error box. Asterisks mark the boundaries of the joint error box, and the coordinates of these boundaries are given in GCN Circular #922.

This page maintained by Don Smith