Gamma-Ray Burst: GRB010222
First Detection of a GRB optical afterglow in Japan

(Comparison of Kyoto image and the DSS)

(Kyoto points plotted on S. Holland's original light curve)

Alert by the BeppoSAX team

(vsnet-grb 66)

NUMBER:  959
SUBJECT: ALERT: GRB020223: the brightest GRB observed by BeppoSAX
DATE:    01/02/22 10:36:47 GMT
FROM:    Luigi Piro at IAS/CNR Frascati  
On Feb. 22, 07:23:30 U.T. a very bright GRB, possibly the brightest ever observed by BeppoSAX has been detected simultaneously by the GRBM and WFC1 aboard BeppoSAX.

Preliminary coordinates from WFC are:

R.A.(2000)= 223.069
DEC.(2000)= 43.035

The error radius at this stage of analysis is 5'.

We are planning a BeppoSAX-NFI observation.

Luigi Piro
BeppoSAX Mission Scientist
(vsnet-grb 67)

Re: GRB 010222

(What is the correct name of the burst?) Close to center of the error circle of the giant burst, detected by BeppoSAX on Feb. 22, there is a white dwarf, which may serve as a good local photometric calibration standard.

GSC3049.579 145214.68 +430141.7 (2000.0) 14.53 1
GSC3049.579 145214.75 +430141.1 (2000.0) 14.64 1
USNO1275.08641199 145214.724 +430140.90 (2000.0) 14.7 13.9
145213.3 +430139 (2000.0) FBS1450+432 14.5pg B1 DA 1 
145213.3 +430140 (2000.0) PG1450+432 14.56 DA 1
145217.9 +430059 (2000.0) DA1(Buscombe) V=14.50 B-V=-.22 U-B=-.89
(vsnet-grb 70)

NUMBER:  960
SUBJECT: GRB010222: BeppoSAX refined position
DATE:    01/02/22 11:39:13 GMT
FROM:    Luigi Piro at IAS/CNR Frascati  

GRB010222: BeppoSAX refined position

Refined  coordinates of GRB010222  from BeppoSAX WFC are:

R.A.(2000)= 223.051
DEC.(2000)= 43.012

The error radius at this stage of analysis is 2.5'.

Please note that in GCN 959 the burst has been named GRB020223 instead of
GRB010222 due to a trivial typo.

G. Gandolfi
on behalf of BeppoSAX Mission Scientist

Optical Counterpart

(vsnet-grb 71)

NUMBER:  961
DATE:    01/02/22 11:48:59 GMT
FROM:    Arne A. Henden at USNO/USRA  

A. Henden, on behalf of the USNO GRB team, reports:

A possible optical transient has been detected in the SAX
error box (GCN 960).  It is about 18th magnitude in V.  The
coordinates are:
  223.05238  43.01844
  14:52:12.0 +43:01:06  J2000 (corrected position in GCN 962)
Observations continue.
(vsnet-grb 75)

Dear colleagues,

We are observing GRB 010222 OT at Nyrola Observatory.
Our first summed image is posted to :

Image is taken February 22, 2001 17.40 UT. It is a sum of first nine five minute R-exposures. GRB magnitude is approximately 19 mag.

We will continue observing all night with BVR filters.

On behalf of Nyrola Observatory GRB team

Harry T. Hyvonen

Kyoto observation: positive detection!

(vsnet-grb 82)

M. Uemura, R. Ishioka, H. Iwamatsu, T. Kato, Kyoto Univ., and H. Yamaoka, Kyushu Univ., on behalf of VSNET-GRB collaboration report:

We observed the field of GRB 010222 starting at Feb. 22, 12:16 UT, with 0.30-m Schmidt-Cassegren telescope (+ unfiltered CCD) at Kyoto University. The GRB was detected on the images. The following photometry has been obtained:

      mid UT                    total exp. delta mag  detection level
   Feb. 22.534 (22.511-22.554)    2160s       3.09   (1.7 sigma)
        22.852 (22.842-22.861)    1350s       4.61   (6.2 sigma)
The magnitudes are relative to PG 1450+432 (V=14.50). By assuming Rc = 14.70 for this star (Henden et al.), the observed magnitudes are 17.8 and 19.3 respectively. The low detection level of the first run was a result of low-alititude haze.

This message may be cited.

Links to other pages on GRB010222

Astronomy Picture of the Day (APOD)

Greiner's page

For more reading (in Japanese)

Links to other GRBs on VSNET

GRB 990123

GRB 021004

GRB 021004 (in Japanese)

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