Gamma-ray Burst 130513A

(All information courtesy of the instrument teams.)

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Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Mon 13 May 13 07:41:45 UT
NOTICE_TYPE:    INTEGRAL Refined
TRIGGER_NUM:    6842,   Sub_Num: 2
GRB_RA:         144.7460d {+09h 38m 59s} (J2000),
                144.9133d {+09h 39m 39s} (current),
                144.1200d {+09h 36m 29s} (1950)
GRB_DEC:         -5.2375d {-05d 14' 14"} (J2000),
                 -5.2983d {-05d 17' 53"} (current),
                 -5.0110d {-05d 00' 39"} (1950)
GRB_ERROR:      2.88 [arcmin, radius, statistical only]
GRB_INTEN:      11.94 [sigma]
GRB_TIME:       27537.19 SOD {07:38:57.19} UT
GRB_DATE:       16425 TJD;   133 DOY;   13/05/13
SC_RA:          149.60 [deg] (J2000)
SC_DEC:         -14.25 [deg] (J2000)
SUN_POSTN:       50.31d {+03h 21m 15s}  +18.45d {+18d 26' 57"}
SUN_DIST:        96.03 [deg]   Sun_angle= -6.3 [hr] (East of Sun)
MOON_POSTN:      88.75d {+05h 55m 00s}  +19.84d {+19d 50' 12"}
MOON_DIST:       60.64 [deg]
GAL_COORDS:     240.34, 33.37 [deg] galactic lon,lat of the burst
ECL_COORDS:     148.87,-18.20 [deg] ecliptic lon,lat of the burst
COMMENTS:       INTEGRAL GRB Coordinates.  
COMMENTS:       Time_Scale=20.0000 and Time_Error=20.0000.  
COMMENTS:       Possibly real GRB event

red DSS finding chart ps-file
GCN Circular #14630
S.Mereghetti (IASF-Milano), D.Gotz (CEA, Saclay), C.Ferrigno, E.Bozzo, P.Bordas (ISDC, Versoix), and J.Borkowski (CAMK, Torun) on behalf of the IBAS Localization Team report:
a gamma ray burst lasting about 50 s has been detected by IBAS in the IBIS/ISGRI data at 07:38:00 UT of May 13.
The refined coordinates (J2000) are:
R.A.= 144.77525 deg DEC.= -5.24393 deg
with an uncertainty of 2 arcmin (90% c.l.).
The burst had a peak flux of 0.7 counts/cm2/s (20-200 keV, 1-s integration time) and a fluence in the same energy range of about 1e-6 erg/cmq.
A plot of the light curve will be posted at http://ibas.iasf-milano.inaf.it/IBAS_Results.html

GCN NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Mon 13 May 13 16:06:38 UT
NOTICE_TYPE:    INTEGRAL Offline
TRIGGER_NUM:    6842,   Sub_Num: 4
GRB_RA:         144.7751d {+09h 39m 06s} (J2000),
                144.9424d {+09h 39m 46s} (current),
                144.1492d {+09h 36m 36s} (1950)
GRB_DEC:         -5.2439d {-05d 14' 37"} (J2000),
                 -5.3047d {-05d 18' 16"} (current),
                 -5.0173d {-05d 01' 01"} (1950)
GRB_ERROR:      2.00 [arcmin, radius, statistical only]
GRB_INTEN:      11.94 [sigma]
GRB_TIME:       27537.19 SOD {07:38:57.19} UT
GRB_DATE:       16425 TJD;   133 DOY;   13/05/13
SC_RA:          149.60 [deg] (J2000)
SC_DEC:         -14.25 [deg] (J2000)
SUN_POSTN:       50.66d {+03h 22m 38s}  +18.53d {+18d 32' 05"}
SUN_DIST:        95.73 [deg]   Sun_angle= -6.3 [hr] (East of Sun)
MOON_POSTN:      93.15d {+06h 12m 35s}  +19.54d {+19d 32' 17"}
MOON_DIST:       56.67 [deg]
GAL_COORDS:     240.37, 33.39 [deg] galactic lon,lat of the burst
ECL_COORDS:     148.91,-18.20 [deg] ecliptic lon,lat of the burst
COMMENTS:       INTEGRAL GRB Coordinates.  
COMMENTS:       Time_Scale=20.0000 and Time_Error=20.0000.  
COMMENTS:       refined_coordinates_after_offline_analysis_delayed_for_technical_reasons

GCN Circular #14635
P.A. Evans (U. Leicester) and F. E. Marshall (NASA/GSFC) report on behalf of the Swift-XRT team:
We have analysed 3.9 ks of XRT data for the INTEGRAL-detected burst: GRB 130513A (Mereghetti et al., GCN 14630), from 25.4 ks to 37.2 ks after the INTEGRAL trigger. The data are entirely in Photon Counting (PC) mode. An X-ray source is detected within the INTEGRAL error circle. Using 2486 s of PC mode data and 2 UVOT images, we find an enhanced XRT position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 144.76167, -5.24171 which is equivalent to:
```
RA (J2000): 09h 39m 02.80s
Dec(J2000): -05d 14' 30.1"
```
with an uncertainty of 2.7 arcsec (radius, 90% confidence). This position is 49 arcsec from the INTEGRAL position.
The source is fading, and the light curve can be modelled with a power-law of index 3.3 (+1.1, -0.45). We therefore conclude that it is the afterglow of the GRB.
We detect only 24 photons from this source, so the spectrum is poorly constrained. The photon index is 2.9 (+2.1, -1.1); the absorption is consistent with the Galactic value of 3.4e20 cm^-2 (Kalberla et al. 2005) however within the errors on the spectral fit, could be as high as 5e21 cm^-2.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00020274.
This circular is an official product of the Swift-XRT team.
GCN Circular #14639
S. Schmidl, D. A. Kann (both TLS Tautenburg) and J. Greiner (MPE Garching) report on behalf of the GROND team:
We observed the field GRB 130513A (INTEGRAL trigger 6842; Mereghetti et al., GCN 14630) simultaneously in g'r'i'z'JHKs with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2 m MPG/ESO telescope at La Silla Observatory (Chile).
Observations started in twilight at 22:54:57 UT on May 13th, 15.3 hours after the IBAS trigger. They were performed at an average seeing of 1".0 and at an average airmass of 1.1.
Inside the 2".7 refined XRT error circle (Evans et al., GCN 14635), we do not detect any sources. Based on an observation with 1500 s integration time in g'r'i'z' and 1200 s integration time in JHK, centered at 0.6959 days after the trigger, we estimate preliminary 3-sigma upper limits (all in AB system) of
```
g' > 25.4,
r' > 24.9,
i' > 24.2,
z' > 23.9,
J  > 21.4,
H  > 20.6 and
K  > 20.2.
```
We note that if the XRT source is indeed the afterglow, then it is very faint optically. Galactic extinction is negligible.
Given magnitudes are calibrated against GROND zero points (g'r'i'z') as well as 2MASS field stars (JHK) and are not corrected for the expected Galactic foreground extinction corresponding to a reddening of E_(B-V)=0.03 mag in the direction of the burst (Schlegel et al. 1998).
GCN Circular #14641
F. E. Marshall (NASA/GSFC) reports on behalf of the Swift team:
The Swift/UVOT began settled observations of the field of GRB 130513A 25261 s after the INTEGRAL trigger (Mereghetti et al., GCN Circ. 14630). No optical afterglow consistent with the XRT position (Evans and Marshall GCN Circ. 14635) is detected in the initial UVOT exposures. Preliminary 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the initial exposures are:
```
Filter         T_start(s)   T_stop(s)      Exp(s)         Mag
  
white            25885        32269         1218         >21.9
v                26510        32924         1267         >20.6
u                25261        37138         1399         >21.6
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.03 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #14642
Nat Butler (ASU), Alan M. Watson (UNAM), Alexander Kutyrev (GSFC), William H. Lee (UNAM), Michael G. Richer (UNAM), Chris Klein (UCB), Ori Fox (UCB) J. Xavier Prochaska (UCSC), Josh Bloom (UCB), Antonino Cucchiara (UCSC), Eleonora Troja (GSFC), Owen Littlejohns (ASU), Enrico Ramirez-Ruiz (UCSC), Jos=E9 A. de Diego (UNAM), Leonid Georgiev (UNAM), Jes=FAs Gonz=E1lez (UNAM), Carlos Rom=E1n-Z=FA=F1iga (UNAM), Neil Gehrels= (GSFC), and Harvey Moseley (GSFC) report:
We observed the field of GRB 130513A (Mereghetti, et al., GCN Circular 14630) with the Reionization and Transients Infrared Camera (RATIR; www.ratir.org) on the 1.5m Harold Johnson Telescope at the Observatorio Astron=F3mico Nacional on Sierra San Pedro M=E1rtir from 2013/05 14.15 to 2013/05 14.16 UTC (19.97 to 20.30 hours after the BAT trigger), obtaining a total of 0.18 hours exposure in the r' and i' bands and 0.07 hours exposure in the Z, Y, J, and H bands.
For a source within the Swift-XRT error circle (Evans & Marshall, GCN Circular 14635), in comparison with USNO-B1 and 2MASS, we obtain the following upper limits (3-sigma):
```
 r'	> 22.64
 i'	> 22.65
 Z	> 21.34
 Y	> 20.65
 J	> 20.26
 H	> 19.71
```
These magnitudes are in the AB system and not corrected for Galactic extinction in the direction of the GRB.
We thank the staff of the Observatorio Astron=F3mico Nacional in San Pedr= o=20 M=E1rtir.
GCN Circular #14647
U.Quadri, L.Strabla, R.Girelli and A.Quadri report:
We imaged the field of GRB 130513A (INTEGRAL trigger 6842; Mereghetti et al., GCN 14630) with the robotic telescope of (IAU station 565) Bassano Bresciano Observatory, Italy.
The observations started (after the dusk) 12h 19m after the GRB trigger, with our Schmidt telescope D=400 mm F/D=3
Weather conditions were very good.
We co-added 2 series of 10 unfiltered CCD exposures of 120s each.
We did not found any optical counterpart in the Swift-XRT error circle (Evans & Marshall, GCN Circular 14635) at our following limiting magnitude: .
```
Start      End       Mlim
T0+        T0+
12.3h      13.0h     19.0
```
Magnitudes were estimated with the USNO-B1 cat. and are not corrected for galactic dust extinction.
The message may be cited.
GCN Report 427.1
GCN_Report 427.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_427_1.pdf by F.E. Marshall at NASA/GSFC titled: "Swift Observations of INTEGRAL GRB 130513A"

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Jochen Greiner, last update: 14-May-2013 [Disclaimer]