Gamma-ray Burst 070615

(All information courtesy of the instrument teams.)

Previous IAU Circulars

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Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Fri 15 Jun 07 02:21:23 UT
NOTICE_TYPE:    INTEGRAL Wakeup
TRIGGER_NUM:    4632,   Sub_Num: 0
GRB_RA:          44.3015d {+02h 57m 12s} (J2000),
                 44.3947d {+02h 57m 35s} (current),
                 43.6762d {+02h 54m 42s} (1950)
GRB_DEC:         -4.3996d {-04d 23' 57"} (J2000),
                 -4.3699d {-04d 22' 11"} (current),
                 -4.5999d {-04d 35' 59"} (1950)
GRB_ERROR:      2.97 [arcmin, radius, statistical only]
GRB_INTEN:      10.77 [sigma]
GRB_TIME:       8445.94 SOD {02:20:45.94} UT
GRB_DATE:       14266 TJD;   166 DOY;   07/06/15
SC_RA:           38.30 [deg] (J2000)
SC_DEC:         -10.57 [deg] (J2000)
SUN_POSTN:       83.07d {+05h 32m 18s}  +23.29d {+23d 17' 06"}
SUN_DIST:        46.78 [deg]   Sun_angle= 2.6 [hr] (West of Sun)
MOON_POSTN:      82.26d {+05h 29m 02s}  +28.11d {+28d 06' 23"}
MOON_DIST:       48.82 [deg]
GAL_COORDS:     181.36,-52.38 [deg] galactic lon,lat of the burst
ECL_COORDS:      40.45,-20.33 [deg] ecliptic lon,lat of the burst
COMMENTS:       INTEGRAL GRB Coordinates.  
COMMENTS:       Possibly real GRB event

red DSS finding chart ps-file

GCN NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Fri 15 Jun 07 03:16:17 UT
NOTICE_TYPE:    INTEGRAL Offline
TRIGGER_NUM:    4632,   Sub_Num: 1
GRB_RA:          44.3077d {+02h 57m 14s} (J2000),
                 44.4009d {+02h 57m 36s} (current),
                 43.6824d {+02h 54m 44s} (1950)
GRB_DEC:         -4.4078d {-04d 24' 27"} (J2000),
                 -4.3781d {-04d 22' 40"} (current),
                 -4.6080d {-04d 36' 28"} (1950)
GRB_ERROR:      2.00 [arcmin, radius, statistical only]
GRB_INTEN:      10.77 [sigma]
GRB_TIME:       8445.94 SOD {02:20:45.94} UT
GRB_DATE:       14266 TJD;   166 DOY;   07/06/15
SC_RA:           38.30 [deg] (J2000)
SC_DEC:         -10.57 [deg] (J2000)
SUN_POSTN:       83.11d {+05h 32m 27s}  +23.29d {+23d 17' 13"}
SUN_DIST:        46.81 [deg]   Sun_angle= 2.6 [hr] (West of Sun)
MOON_POSTN:      82.88d {+05h 31m 31s}  +28.12d {+28d 07' 24"}
MOON_DIST:       49.28 [deg]
GAL_COORDS:     181.38,-52.38 [deg] galactic lon,lat of the burst
ECL_COORDS:      40.46,-20.34 [deg] ecliptic lon,lat of the burst
COMMENTS:       INTEGRAL GRB Coordinates.  
COMMENTS:       refined_coordinates_after_offline_analysis

GCN Circular #6537
S.Mereghetti, A.Paizis (IASF-Milano), D.Gotz (CEA-Saclay), V.Beckmmann, M. Beck, C.Steiner (ISDC, Versoix), and J. Borkowski (CAMK, Torun) on behalf of the IBAS Localization Team report:
A GRB lasting about 30 s has been detected by IBAS in IBIS/ISGRI data on June 15 at 02:20:45 UT
The coordinates (J2000) are:
```
RA: 44.307736 [degrees] 
DEC: -4.407888 [degrees]
```
with an uncertainty of 2 arcmin (90% c.l.).
The light curve is a single, FRED-like peak
This message can be cited.
GCN Circular #6538
John French (University College Dublin), Petr Kubanek (GACE Valencia), Gary Melady (University College Dublin), Martin Jelinek IAA CSIC Granada)
report on behalf of the Watcher collaboration:
The Watcher 40cm robotic telescope, located at Boyden Observatory, South Africa, began imaging the field of INTEGRAL GRB 070615 (Mereghetti et al., GCN 6537) at 02:22:08 UT, 1m22s after the IBAS trigger.
Initial observations were performed at high airmass and show no new source down to an R-band limiting magnitude of approximately 15 (in comparison with USNO-B1). Observations and analysis are ongoing.
This message may be cited.
GCN Circular #6540
P.Schady (MSSL-UCL) and N. Lyons (Leicster) report on behalf of the UVOT team
Swift/UVOT began observing the field of the INTEGRAL burst GRB070615 10.7hrs after the IBAS trigger in the V and white filters. No afterglow is detected in any of the individual or co-added observations down to the following 5-sigma upper limits:
```
Filter           T_mid (s) Exp (s)   UL Mag (5sig)
====================================
V		46354	2887	19.59
White	51435	36		18.07
====================================
```
where T_mid corresponds to weighted mid time of the observation. The values quoted above are not corrected for the expected Galactic reddening of E(B-V) = 0.12 mag (Schlegel et al. 1998).
GCN Circular #6544
O. Godet, N. Lyons, K.L. Page, P.A. Evans, J. Osborne, R. Starling (U. Leicester) and G. Tagliaferri (INAF-OAB) report on behalf the Swift-XRT team:
The XRT started to observe the field of the INTEGRAL burst GRB 070615 (Mereghetti et al., GCN 6537) 10.7h after the IBAS trigger. We analysed around 3ks of PC data. A possible weak and uncatalogued X-ray source is detected at a position of:
```
RA(J2000)  =  02h 57m 15.37s 
Dec(J2000) = -04d 24' 26.6"
```
with an uncertainty of 7.5 arcsec (90% containment radius). This is 23 arcsec from the INTEGRAL position given by Mereghetti et al. (GCN Circ. 6537).
We note that there are only 5 counts detected in the error circle centred on this position. In this region, only ~0.07 background counts would be expected. Using the Bayesian method to find a 99.7\% level confidence limit on the actual number of counts from the source, the range would then be between 0.8 and 14.9 counts. We estimate the probability that this detection is due to a background fluctuation to be 6e-7, suggesting that this is a real detection.
Since it is impossible to say whether or not the source is fading, we cannot say with any certainty that the source is the X-ray afterglow of GRB 070615.
This circular is an official product of the Swift-XRT team.
GCN Circular #6580
O. Godet, N. Lyons, K.L. Page, A.P. Beardmore (U. Leicester) report on behalf the Swift-XRT team:
In Godet et al. (GCN Circ. 6544), we reported the detection of a faint and uncatalogued X-ray source after analysing 3ks of Swift PC data taken 10.7h after the IBAS trigger (Mereghetti et al., GCN Circ. 6537). We estimated the source count rate to be between 5.5e-4 c/s and 3.6e-3 c/s at a 95% confidence level using the Bayesian method. However, it was impossible to say whether or not the source was fading due to the limited statistics.
We analysed 8.5ks of additional PC data taken 6.9 days after the IBAS trigger and no counts were found inside the 7.5 arcsec radius error circle. In this region, only 0.1 background counts would be expected. Using the Bayesian method, we estimated the upper limit on the count rate to be around 3.5e-4 c/s at a 95% confidence level. So, the weak X-ray source may be fading.
This is an official product of the Swift XRT team.

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Jochen Greiner, last update: 26-Jun-2007 [Disclaimer]