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Gamma Ray Burst 030226
11h 33m 04.92s
+25� 53' 55.62"
2000

Distance : 10 000 mill l.y. ( ? )

GRB approx. Mag 19.5 CR

Exposure time : 14 X 60 sec.
0.61m f/4.3 MX916 CCD
+LUMICON Deep Sky Filter
Transm. : 440nm - 540nm and 625nm -

26.95 Feb 2003

Reference stars :
A Rmag 15.39
B Rmag 17.06
C Rmag 18.0



One of the best images taken 26.3 Feb 2003 at Tenagra II by Michael Schwartz.





The plot show measurements from many different observatories in the world. The Afterglow, The Optical Transient ( OT ), decreases approximately after the simple formula t-alpha ( flux, not magnitude ) where the Decay Index alpha = 0.88 and t = hours after the event. An interesting break ( alpha = 1 - 2 ) occured on Feb 27th.
The plot also show when the Gamma-Event occurred and when the Alarm went ( almost 2 hours ). The first measurement at mag 20 was done with the 2.5m Dupont-telescope at Las Campanas Observatory. Maximum ( 17.8 ) was measured with the 8.2m Subaru-telescope at Mauna Kea. Whats interesting too is that light-maximum came a good while after the gamma rays, an indication of the the sequence of events that occurred. There was also measured a red-shift z = 2 which should give a distance more than 10 000 million light-years.


Plottet viser m�linger fra mange forskjellige observatorier i verden. Ettergl�den, den Optiske Transient ( OT ) avtar tiln�rmet etter den enkle formelen t-alpha ( flux, ikke magnitude ) hvor " Decay Indeksen " alpha = 0.88 og t = timer etter begivenheten. Et interessant brudd ( alpha = 1 - 2 ) intraff den 27 Feb.
Det viser ogs� n�r Gamma-Begivenheten intraff og n�r Alarmen gikk ( nesten 2 timer ). Den f�rste m�lingen p� mag 20 ble gjort med 2.5m Dupont-teleskop p� Las Campanas Observatoriet. Maksimum ( 17.8 ) ble m�lt med 8.2m Subaru-teleskopet p� Mauna Kea. Det som ogs� er interessant er at lys-maksimum kommer en god stund etter gamma str�lingen, en indikasjon p� begivenetenes gang. Det ble ogs� m�lt en r�dforskyvning i spekteret p� z = 2 som skulle gi en avstand p� over 10 milliarder lys�r.


Melding fra Institutt for Teoretisk Astrofysikk

Norsk gammaglimt-nettverk

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