Gamma-Ray Burst: GRB 010222

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

TITLE:   GCN GRB OBSERVATION REPORT
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)

TITLE:   GCN GRB OBSERVATION REPORT
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)

TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  961
SUBJECT: GRB010222
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 :

http://nyrola.jklsirius.fi/grb/

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.

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