GRB - HETE 2177/2178

 

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Transiente Raio X - XTEJ0929-314
GRB - HETE 2177/2178

 

GRB Optical Counterpart Suspect that turns out in an artifact

 

Burst Info

GRB Detection Date: 02/08/01 12:58:41.89 UT

GRB Notice Date: Thu 01 Aug 02 14:54:54 UT

Center of Error Pattern RA: 314.786d {+20h 59m 09s} (J2000), Dec: -51.924d {-51d 55' 25"} (J2000), Error Pattern Size (arc min): 777.85min

Type of Notice (see web page for details): HETE Ground Analysis Comments from GCN: Definite GRB. Burst_Validity flag is true. HETE GRB Coordinates.

WXM S/N is less than a reasonable value.

WXM data refined since S/C_Last Notice.

Long event (~300s)

WXM X localization is very good, but the Y localization

is weak. The error box here is calculated using the X

localization and an assumption of Y localization

limits based on the illumination pattern of the wires

in the WXM X detector.

The same localization is found for HETE burst 2178,

detected ~300s after 2177.

 

Trying to detect optical counterpart of HETE 2177/2178 we shot two images of region in Indus as below. Each image was a composite of some 60x30 seconds in a 10"SCT

 

 

One thing strange was the very very far away galaxy APMUKS(BJ) B205539.73-520903.4, located some 2.5 arc min from central position as imaged below in DSS2. The pink cross is the center position of HETE burst. The arrow indicates the galaxy.

Photometry      19.1C

Position           20h 59m 14.7s  -51d 57m 21.5s

Images taken at 00:30 UT and 01:00 UT  08.02.2002 with a 10"SCT F4 and HX516CCD

Comparing details of the two images and DSS2 suggests that we can have a supernova as indicated from elongated image of galaxy near the center of images and double profile as below

DSS detail above. Note that the galaxy at left is elongated spiral and the object at center is more like an elliptical.

Details of my two images. Note elongation in same direction of the two galaxies.

Below the double peak profile of galaxy image at center suggesting a supernova or anything like it

The image Ive obtained in the next day shows that it was probably an artifact as shown below.