| Summary table |
|---|
| Variable |
Value |
Source |
| GRB_name_Fermi |
GRB150512432 |
|
| T0 |
10:22:05.905 UTC |
Fermi_GBM |
| ra |
200.5000° |
Fermi_GBM |
| decl |
59.1100° |
Fermi_GBM |
| pos_error |
8.59e+00° |
Fermi_GBM |
| T90 |
123.138 s |
Fermi_GBM |
| T90_error |
3.167 s |
Fermi_GBM |
| T90_start |
10:22:05.905 UTC |
Fermi_GBM |
| fluence |
1.44e-05 erg/cm² |
Fermi_GBM |
| fluence_error |
1.10e-07 erg/cm² |
Fermi_GBM |
| T100 |
123.138 s |
|
| GBM_located |
True |
|
| mjd |
57154.43201278935 |
Fermi_GBM |
| Fermi GBM table |
|---|
| GRB_name_Fermi |
GRB150512432 |
| trigger_name |
bn150512432 |
| ra |
200.5000° |
| decl |
59.1100° |
| pos_error |
8.59e+00° |
| datum |
2015-05-12 |
| t_trigger |
10:22:25.873 UTC |
| T90 |
123.138 s |
| T90_error |
3.167 s |
| T90_start |
10:22:05.905 UTC |
| fluence |
1.44e-05 erg/cm² |
| fluence_error |
1.10e-07 erg/cm² |
| flux_1024 |
5.74e+00 erg/cm²/s |
| flux_1024_error |
3.14e-01 erg/cm²/s |
| flux_1024_time |
1.01e+02 erg/cm²/s |
| flux_64 |
7.85e+00 erg/cm²/s |
| flux_64_error |
1.36e+00 erg/cm²/s |
| GCN 17809 table |
|---|
| GRB_name |
GRB150512A |
| GCN_number |
17809 |
| Detection_method |
iPTF |
| ra |
205.1876° |
| decl |
63.3315° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 17809
SUBJECT: GRB 150512A: iPTF Optical Observations
DATE: 15/05/13 18:50:52 GMT
FROM: Leo Singer at GSFC/iPTF
L. P. Singer (NASA/GSFC), V. Bhalerao (IUCAA), M. M. Kasliwal
(Carnegie Observatories/Princeton), and S. B. Cenko (NASA/GSFC) report on
behalf of the intermediate Palomar Transient Factory (iPTF) collaboration:
Fermi detected GRB 150512A (Fermi trigger 453118948 / bn150512432) at
2015-05-12 10:22:25.87. At 2015-05-13 03:58:15, 17.6 hours after the
burst, we began searching for optical counterparts using the Palomar
48-inch Oschin telescope (P48).
We imaged 20 fields covering an area of 144 deg^2 covering the 1-sigma
statistical+systematic region of the final Fermi GBM localization. We
estimate a 76% prior probability that these fields contain the true
location of the source. Sifting through candidate variable sources using
image subtraction and standard iPTF vetting procedures, we detected the
following optical transient candidates:
iPTF15asm, at the coordinates:
RA(J2000) = 13h 40m 45.03s (205.187617 deg)
Dec(J2000) = +63d 19' 53.3" (+63.331461 deg)
This position is 6" from the galaxy SDSS J134044.09+631954.4 (z = 0.104).
We report the following P48 photometry:
-95 days: R > 20.27
+18.01 hours: R = 19.49 +/- 0.06
+18.93 hours: R = 19.42 +/- 0.06
iPTF15asn, at the coordinates:
RA(J2000) = 13h 57m 40.01s (209.416716 deg)
Dec(J2000) = +65d 08' 01.6" (+65.133789 deg)
We report the following P48 photometry:
-95 days: R > 20.42
+18.01 hours: R = 19.82 +/- 0.07
+18.93 hours: R = 19.98 +/- 0.07
No source was visible in archival P48 and SDSS images at either position.
Times are relative to the GBM trigger. Magnitudes are in the Mould R
filter and in the AB system, calibrated with respect to point sources in
SDSS as described in Ofek et al. (2012, http://dx.doi.org/10.1086/664065).
We encourage further observations of both candidates to determine if
either is fading and potentially related to the GRB.
The diagram http://www.its.caltech.edu/~lsinger/iptf/Fermi453118948.pdf
shows the locations of our candidates and the P48 fields in relation to
the Fermi GBM 1- and 2-sigma statistical+systematic contours.
|
| GCN 17811 table |
|---|
| GRB_name |
GRB150512A |
| GCN_number |
17811 |
| Detection_method |
Fermi GBM Det |
| t_trigger |
10:22:25.870 UTC |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 17811
SUBJECT: GRB 150512A: Fermi GBM detection
DATE: 15/05/13 21:53:22 GMT
FROM: Binbin Zhang at UAH
Bin-Bin Zhang (UAH) and A. von Kienlin (MPE) report on behalf of the
Fermi GBM Team:
"At 10:22:25.87 UT on 12 May 2015, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 150512A (trigger 453118948 / 150512432),
which was also detected by the iPTF (Singer et al. 2015,GCN 17809).
The GBM on-ground location is consistent with the positions of the
potential transient sources reported by iPTF (Singer et al. 2015,
GCN 17809). The angle of the burst direction to the Fermi LAT boresight
was 95 degrees.
The GBM light curve consists of several peaks with a total duration
(T90) of about 123 s (50-300 keV). The time-averaged spectrum from
T0-20 s to T0+104 s is best fit by a BAND function with Epeak = 121.5
+/- 18.7 keV, alpha = -0.9 +/- 0.1 and Beta = -2.0 +/- 0.1. The event
fluence (10-1000 keV) in this time interval is (2.17 +/- 0.06)E-05 erg/cm^2.
The 1.0-sec peak photon flux measured starting from T0+101 s in the 10-1000
keV band is 5.5 +/- 0.3 ph/s/cm^2.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."
|
| GCN 17815 table |
|---|
| GRB_name |
GRB150512A |
| GCN_number |
17815 |
| Detection_method |
Optical |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 17815
SUBJECT: GRB 150512A: CrAO optical observations
DATE: 15/05/14 19:30:18 GMT
FROM: Alexei Pozanenko at IKI, Moscow
E. Mazaeva (IKI), V. Rumyantsev (CrAO), A. Pozanenko (IKI) report on
behalf of larger GRB follow-up collaboration:
We observed the two OT candidates (Singer et al., GCN 17809) of the
Fermi GRB 150512A (Zhang et al., GCN 17811) with ZTSh telescope of CrAO
observatory starting on May. 13 (UT) 21:04:53. Both candidats are
clearly visible in our images. Photometry of the candidates is following
iPTF15asn:
Date UT start t-T0 Filter Exp. Source Err.
(mid, days) (s)
2015-05-13 21:04:53 1.45795 R 16*120 19.20 0.03
iPTF15asm:
Date UT start t-T0 Filter Exp. Source Err.
(mid, days) (s)
2015-05-13 21:46:49 1.48417 R 12*120 19.40 0.02
Photometry of iPTF15asm might be biased by nearby galaxy SDSS
J134044.09+631954.4. However both sources do not fade in comparison with
early observations (Singer et al., GCN 17809) and most probably cannot
be considered as afterglow.
Photometry is in Vega, and based on following SDSS stars
SDSS9_id R_Lupton
J135741.63+650759.8 16.82
J135738.44+650852.4 18.03
J135752.58+650922.2 18.14
|