Gamma-ray Burst 010220

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN notice #952 = BeppoSAX MAIL n. 01/04
On Feb. 20, 22:51:07 U.T. a GRB (GRB010220) has been detected simultaneously by the GRBM and WFC2 aboard BeppoSAX.
Preliminary coordinates from WFC are:
```
R.A.(2000)= 39.4
DEC.(2000)= 61.708
```
The error radius at this stage of analysis is 6'.
We are planning a BeppoSAX-NFI observation.

GCN/BACODINE POSITION NOTICE


TITLE:           GCN/SAX_WFC BURST POSITION NOTICE
NOTICE_DATE:     Wed 21 Feb 01 04:52:32 UT
NOTICE_TYPE:     SAX-WFC Initial
GRB_DATE:        11960 TJD;    51 DOY;   01/02/20
GRB_TIME:        82267.00 SOD {22:51:07.00} UT
GRB_SAX_RA:       39.400d {+02h 37m 36s} (J2000),
                  39.422d {+02h 37m 41s} (current),
                  38.436d {+02h 33m 45s} (1950)
GRB_SAX_DEC:     +61.708d {+61d 42' 29"} (J2000),
                 +61.713d {+61d 42' 46"} (current),
                 +61.491d {+61d 29' 29"} (1950)
GRB_SAX_ERROR:   0.100 [deg radius (stat+sys), 1-sigma]
GRB_SAX_INTEN:   unknown
SUN_POSTN:       334.35d {+22h 17m 25s}  -10.63d {-10d 37' 38"}
SUN_DIST:         88.06 [deg]
MOON_POSTN:      309.15d {+20h 36m 36s}  -20.50d {-20d 29' 58"}
MOON_DIST:       108.09 [deg]
COMMENTS:        SAX-WFC GRB Coordinates.  
COMMENTS:        We are planning a BeppoSAX-NFI observation.

red DSS finding chart ps-file
GCN notice #953 = BeppoSAX MAIL n. 01/05
Refined coordinates of GRB010210 from BeppoSAX/WFC are:
```
R.A.(2000)= 39.246
DEC.(2000)= 61.766
```
The error radius at this stage of analysis is 4'.
GCN notice #956
R. Manzo, BeppoSAX Science Operation Center (SOC), Telespazio, Rome R. G. Kaptein, SOC and Space Research Organization Netherlands (SRON), Utrecht, and J.J.M. in' t Zand, Astronomical Institute, Utrecht University and SRON, L. Piro, M. Feroci, G. Gandolfi, P. Soffitta and E. Costa, Istituto di Astrofisica Spaziale del CNR, Rome, F. Frontera and C. Guidorzi, Universita' di Ferrara, Ferrara and L. Amati, Istituto di Tecnologia e Studio delle Radiazioni Extraterrestri del CNR, Bologna.
"The BeppoSAX Gamma Ray Burst Monitor (GRBM) and the Wide Field Camera (WFC) unit 2 observed the GRB 010220 on February 20.952164 UT (GCN 952). The event detected by the GRBM shows a single pulse with a time duration of 40 s and a peak count rate of about 660 cts/s in the 40-700 keV energy band. In the WFC, the duration is about 150 s and the peak flux is 0.7 Crab (2-26 keV). The centroid position of the X-ray counterpart from the WFC image is R.A. = 2h36m59s, Dec = 61o46'.0 (equinox 2000.0) with an error radius of 4' that includes uncertainties due to a non-optimum attitude control configuration (GCN 953).
A follow-up observation with BeppoSAX narrow-field instrument is in progress."
GCN notice #957
GRB 010220, simultaneous optical observations by BOOTES-1
Alberto Castro-Tirado, IAA-CSIC (Granada) and LAEFF-INTA (Madrid) José María Castro Cerón, ROA (San Fernando) Tomás Mateo, CEDEA-INTA (Arenosillo) René Hudec and Jan Soldán, ASU (Ondrejov) Petr Páta and Martin Bernas, CVUT-FEL (Prague) José Ángel Berná, Univ. de Alicante (Alicante) Javier Gorosabel, DSRI (Copenhagen) Benito de la Morena, CEDEA-INTA (Arenosillo) José Torres, DEC-INTA (Madrid) on behalf of the BOOTES-1 Team
report:
"We have obtained about 30 images of a field containing the BSAX/WFC error box for the 150 s long GRB 010220 (Piro et al. GCN 953, Manzo et al. GCN 957) with the ultra wide-field CCD of BOOTES-1 during the time interval Feb 21.93-Feb 21.97 UT (+/- 0.5 h around the GRB occurrence). The exposures, with integration time of 60 s, cover a field of 40 x 28 deg² and reach a limiting magnitude of about R = 10. None of the frames, including the one ending at 22:51:15 UT, i.e. covering the first 8 s of the event, reveals an optical transient within the BSAX/WFC error circle. The next frame started at 22:52:15 UT and covers the time interval t_0 + 68 s to t_0 + 128 s. We notice that the galactic nebula IC 1805 lies along the line of sight of the GRB, at a galactic latitude of b = +1.38 deg, i.e. the extinction is high (A_v = 3.3 mag). Images and additional information can be found at http://www.LAEFF.ESA.Es/~ajct/GRBs/GRB010220/.
This message can be cited."
GCN notice #958
E. Berger (Caltech), D. A. Frail (NRAO), P. A. Price , J. S. Bloom, T. J. Galama (Caltech), R. Kudritzki (IFA), and F. Bresolin (ESO) report on behalf of a larger collaboration:
"Beginning on February 22.21 UT we observed the entire BeppoSAX error circle of GRB010220 (GCN#953) with the VLA at 4.86 and 8.46 GHz. Inside this region we detect one weak source (6.5 sigma), which is not cataloged in the NRAO VLA Sky Survey (NVSS), at RA=02:36:52.1, DEC=61:43:49.1, with a conservative error of 0.3" in each. The detected source is clearly seen in the 4.86 GHz image, but it is only marginally detected at 8.46 GHz (~ 4 sigma). We also detect several sources which correspond to cataloged NVSS sources. We note that the uncataloged source is at the detection threshold of NVSS. Further observations at the VLA are planned.
In addition, R. Kudritzki and F. Bresolin obtained a single I- (100 s) and R-band (300 s) exposure using the Low-Resolution Imaging Spectrometer (LRIS; Oke et al. 1995) on both nights (21.313 and 22.293 Feb 2001 UT). Using ~200 tie stars from the USNO A2.0 catalogue, an astrometric plate solution was obtained for the Keck images. No object is present at either epoch and either filter at the position of the radio source. There is a very bright star ~12 arcsec to the southwest of the radio position. We preliminarily estimate the 3-sigma upper-limit to be R ~ 23.5 mag using an unsaturated star common to the USNO-A2.0 and the R-band image of the second night. Given the proximity to the Galactic plane, infrared observations are encouraged."
This message may be cited.
GCN notice #979
G. Li Causi, A. Di Paola, L.A. Antonelli, S. Puccetti, Osservatorio Astronomico di Roma, Italy, G. Valentini, Osservatorio Astronomico di Teramo, Italy, on behalf of a larger collaboration report:
"On Feb. 21 and Feb. 22 we observed the WFC error circle of GRB 010220 (Piro, GCN #953 and Manzo et al. GCN #956) in J and K band with the AZT-24 1.1-meter telescope at Campo Imperatore (AQ).
At a preliminary investigation of the images we do not find any obvious candidate for the GRB 010220 afterglow. The limiting magnitudes reached in the four observations are reported in the table below:
```
           Date                                
  Band  Feb 2001(UT)  Lim.Mag.   Texp(s)  S/N  
  ===========================================
                                       
    J     21.8841    18.4+/-0.2   2700     3 
    K     21.9258    17.5+/-0.2   3000     3 
    K     22.7627    17.1+/-0.2   2200     3       
    J     22.7990    18.6+/-0.2   2700     3
```
Due to the contamination from the nearby bright star we are not able to detect any object at the radio position quoted by Berger et al., GCN #958.
The Feb. 21 K-band image is posted at http://argos.mporzio.astro.it/angelo/grb010220/
This message is citable."
GCN notice #981
G. G. Williams, R. Uglesich, Mike Bradshaw (Steward Observatory), H. S. Park (LLNL), D. H. Hartmann (Clemson University) report on behalf of the LOTIS collaboration.
We observed the BeppoSAX error box of GRB010220 (GCNs 953, 956) with the 0.6-m Super-LOTIS telescope between Feb. 21.223 and Feb. 21.262 or 6.50 to 7.45 hours after the burst. Comparison between the sum of 11 unfiltered images (total time of t~1360 s) and the DSS-II red scan revealed no candidate optical counterpart brighter than m~20.2. Image subtraction between the first and second half of the observations revealed no new variable source within the error box.
Additional images obtained beginning Feb 22.16 (28.95 hours after the burst) also reveal no counterpart, however the analysis is still in progress.
This message may be cited.
GCN notice #1001
D. Fugazza (Brera Astronomical Observatory), A. Moitinho, H. Plana, S. Monrroy (Observatorio Astronomico Nacional, Mexico), S. Covino, G. Ghisellini (Brera Astronomical Observatory)
We have observed the error box of GRB010220 (GCN 953) with the 0.84m telescope of the Observatorio Astronomico Nacional at San Pedro Martir (Mexico) equipped with the SITE CCD on 22 Feb at 3:00 UT (28.15 hours after the burst). We obtained three 120sec exposures in the R band and 8 120sec exposures in the B band.
No obvious counterpart has been detected and no sources lay at the position of the radio source reported by Berger et al. (GCN 958). The position however is very close to a bright star that may hidden any faint object.
By unsaturated stars common to the USNO-A2.0 we estimate the 3-sigma B and R upper limits at ~23.
This message may be cited
GCN notice #1025
A. Henden (USRA/USNO) reports on behalf of the USNO GRB team:
We have acquired shallow BVRcIc all-sky photometry for an 11x11 arcmin field that covers the BeppoSAX error circle for GRB010220 (GCN 956) with the USNOFS 1.0-m telescope on one marginally photometric night. Stars brighter than V=13 are saturated and should be used with care. We have placed the photometric data on our anonymous ftp site: ftp://ftp.nofs.navy.mil/pub/outgoing/aah/grb/grb010220.dat The current photometry has a potential external zero-point error of about three percent. The astrometry in this file is based on linear plate solutions with respect to USNO-A2.0. The internal errors are less than 100mas. Crowding will yield some unphysical stars due to astrometric and photometric blends. Further calibration of this field will not be performed this season as the field is disappearing into twilight.

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Jochen Greiner, last update: 28-Mar-2001 [Disclaimer]