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Gamma Ray Burst 041218
Position (2000) :
01h 39m 07.7s
+71° 20' 28.8"

Distance : x xxx mill l.y. ( ? )

GRB approx. Mag 18.0 CR

Exposure time : 8 X 60 sec.

Exposure start - end :
16:07:04 - 16:15:51 UT

Telescope :
0.25m f/6.85 MX916 CCD



Blink with DSS1.





TITLE: GCN GRB OBSERVATION REPORT
NUMBER: 2877
SUBJECT: GRB041218: optical observations
DATE: 04/12/19 18:03:25 GMT
FROM: Arto Oksanen at Nyrola Obs., Finland

O. Trondal (otrondal@online.no) Oslo, Norway reports:

"I observed the error region of GRB041218 for the INTEGRAL burst GRB041218 (Mereghetti et al., GCN 2858) with my 25cm Schmidt-Cassegrain telescope and unfiltered CCD (MX916) under clear sky conditions.

I took 8 unfilterd 60 s images. The afterglow reported by Torii (GCN 2860) and Gorosabel et. al. (GCN 2861) is visible in the co-added image at RA 01:39:07.57 Dec +71:20:28.5 (2000.0, USNOA2.0 reference, average residual 0.4 arc secs), at magnitude V=18.6 +/- 0.2 using the field calibration by Henden (GCN 2896).

The observation started 16:07:04 UT and ended 16:15:51 UT on December 18, 2004.









Dana Berry, SkyWorks Digital


                        Gamma Ray Burst 041218

 Pos. (2000) : 01h 39m 07.7s  +71° 20' 28.8" 

 t0 = Dec 18.6565 UT ( 15:45:25 UT  GRB burst).

 2. Coloumn, time in houres after burst
 3. Coloumn show magnitude


  UT  Day      t-t0   mag        Oservatory
-----------------------------------------------------------------------------
Dec 18.6565    0.0    ***        ***               GRB " burst "

Dec 18.674     0.42   18.6    25cm Automatic Imaging Telescope Oslo

Dec 18.760     2.5    19.5   152cm telescope Loiano (Bologna University)  

Dec 18.837     4.3    20.6   200cm Liverpool  telescope at La Palma

Dec 18.912     6.1    21.37  182cm Copernicus telescope Asiago observatoriet Italy

Dec 19.061     9.7    22.41  182cm Copernicus telescope Asiago observatoriet
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