Gamma-ray Burst 010412

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN notice #1033 = BeppoSAX MAIL n. 01/09
On Apr. 12, 21:46 U.T. a GRB has been detected simultaneously by the GRBM and WFC1 aboard BeppoSAX.
Preliminary coordinates from WFC are:
```
R.A.(2000)= 294.89
DEC.(2000)= 13.62
```
The error radius at this stage of analysis is 10'.
We are not planning a follow-up observation of this burst, due to the on-going pointing of another TOO
Luigi Piro BeppoSAX Mission Scientist
GCN notice #1035 = BeppoSAX MAIL n. 01/10
Refined coordinates from WFC are:
```
R.A.(2000)= 294.913
DEC.(2000)= 13.618
```
The error radius is 6'.

GCN/BACODINE POSITION NOTICE


TITLE:           GCN/SAX_WFC BURST POSITION NOTICE
NOTICE_DATE:     Fri 13 Apr 01 12:57:53 UT
NOTICE_TYPE:     SAX-WFC Final
GRB_DATE:        12011 TJD;   102 DOY;   01/04/12
GRB_TIME:        78387.00 SOD {21:46:27.00} UT
GRB_SAX_RA:      294.913d {+19h 39m 39s} (J2000),
                 294.928d {+19h 39m 43s} (current),
                 294.333d {+19h 37m 20s} (1950)
GRB_SAX_DEC:     +13.618d {+13d 37' 07"} (J2000),
                 +13.621d {+13d 37' 17"} (current),
                 +13.503d {+13d 30' 09"} (1950)
GRB_SAX_ERROR:   0.100 [deg radius (stat+sys), 1-sigma]
GRB_SAX_INTEN:   1100.00 [mCrab]
SUN_POSTN:        21.32d {+01h 25m 18s}   +8.96d {+08d 57' 33"}
SUN_DIST:         84.43 [deg]
MOON_POSTN:      261.95d {+17h 27m 48s}  -21.77d {-21d 46' 07"}
MOON_DIST:        47.95 [deg]
COMMENTS:        SAX-WFC GRB Coordinates.  
COMMENTS:          
COMMENTS:        GRB010412: refined positions  
COMMENTS:          
COMMENTS:          
COMMENTS:        Refined  coordinates from WFC are:  
COMMENTS:          
COMMENTS:        R.A.(2000)= 294.913  
COMMENTS:        DEC.(2000)= 13.618  
COMMENTS:          
COMMENTS:        The error radius  is 6'.  
COMMENTS:          
COMMENTS:        Luigi Piro  
COMMENTS:        BeppoSAX Mission Scientist

red DSS finding chart ps-file
GCN notice #1036
K. Hurley, on behalf of the Ulysses GRB team, and C. Guidorzi, E. Montanari, and F. Frontera, on behalf of the BeppoSAX GRBM team, report:
Ulysses and BeppoSAX GRBM observed this burst (GCN 1035). As observed by Ulysses, it had a duration ~80 s, a 25-100 keV fluence of 9.4x10^-6 erg/cm^2, and a peak flux over 0.5 s of ~9 x 10^-7 erg/cm^2 s. These numbers are subject to more than the usual uncertainties because Ulysses is recording a solar proton event which raises its background by a factor of 2 or so. Triangulation gives an annulus centered at RA(2000), Decl(2000)=3.671, -21.012 deg., with radius 75.856 +/- 0.034 deg. (3 sigma). This intersects the WFC error circle to form an error box whose area is approximately 47 sq. arcmin. and whose corners are at
```
          RA(2000)                             DEC(2000)
     294.842577=19 h 39 m 22.22 s      13.545103= 13 o 32 ' 42.37 "
     294.929439=19 h 39 m 43.07 s      13.716716= 13 o 43 '  0.18 "
     294.906675=19 h 39 m 37.60 s      13.518189= 13 o 31 '  5.48 "
     294.990525=19 h 39 m 57.73 s      13.683762= 13 o 41 '  1.54 "
```
This error box can be refined by further processing.
GCN notice #1037
A. Paolino, BeppoSAX Scientific Operation Centre (SOC), Telespazio, Rome, R.G. Kaptein, SOC and Space Research Organisation Netherlands (SRON), Utrecht, J.J.M. in 't Zand, Astronomical Institute, Utrecht University and SRON, C. Guidorzi and F. Frontera, Phys. Dept. University of Ferrara, L. Amati, Istituto TESRE / CNR, Bologna and L. Piro, Istituto di Astrofisica Spaziale / CNR, report:
"GRB010412 was triggered by the BeppoSAX Gamma Ray Burst Monitor (GRBM) on April 12.907280 U.T and was also detected by the Wide Field Camera (WFC) unit 1 onboard the same satellite. A preliminary analysis of the GRBM data shows a very complex, multi-pulse time profile. The duration is about 75 s and the peak count rate 1896 +/- 59 cts/s, corresponding to a 1 s peak flux of (1.71 +/- 0.06) x 10^(-6) erg/cm2/s in the 40-700 keV energy band. The WFC data show a duration of about 90 s and a peak flux of 2.3 Crab (2-28 keV). The position of the X-ray counterpart is R.A.= 19h 39m 39.0s, Decl.=+13d 37'06.6' (equinox 2000.0) with an error radius of 6', that includes uncertainties due to a non-optimum attitude control configuration. No follow-up observation with the BeppoSAX NFI was scheduled, due to an on-going other TOO."
This message may be cited.
GCN notice #1038
P.A. Price, T.S. Axelrod and B.P. Schmidt (RSAA, ANU) report:
"We have observed the error box of GRB 010412 (Piro et al., GCN #1033; Hurley et al., GCN #1036) with the robotic 50-inch telescope at Mount Stromlo Observatory at 2001 Apr 13.73 UT. Our 3x300 sec exposures cover the entire error box to a limiting magnitude of R ~ 20.0 mag, based on common stars with the USNO-A2.0 catalogue. We do not detect any optical transient within the error box, based on visual comparison with the Digital Palomar Sky Survey. The high stellar density and large Galactic reddening (A_V ~ 1.5 mag) at this low Galactic latitude (-4.2 deg) may, however, obscure a potential OT."
This message may be cited.
GCN notice #1039
P.A. Price (Caltech/RSAA,ANU), P. Gorham (JPL), S.A. Yost and S.R. Kulkarni (Caltech) report on behalf of the larger Caltech/NRAO/CARA GRB collaboration:
"P. Gorham observed the error box of GRB 010412 with the Palomar 60-inch telescope around 2001 Apr 13.5 UT (0.6 days after the GRB). The observations consisted of 2x450 sec integrations in I-band at each of four pointings to cover the entire original error-circle (GCN #1033). Within the IPN error-box (GCN #1036), we find no optical transient, on visual comparison with the Digital Palomar Observatory Sky Survey plates. We estimate the limiting magnitude of our images to be I ~ 20.5 mag."
This message may be cited.
GCN notice #1042
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 center of the error box for GRB010412 with the USNOFS 1.0-m telescope on one photometric night. Stars brighter than V=13.5 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/grb010412.dat The current photometry has a potential external zero-point error of about two 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. Since this is a crowded field, you should check the DSS images and only use stars for calibration that do not have neighbors. Further calibration of this field will be performed if an optical afterglow is identified.

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Jochen Greiner, last update: 18-Apr-2001 [Disclaimer]