School of Physics & Astronomy

| site map

Home
About
The Swift Mission UK involvement Instruments
GRBs before Swift GRBs in the Swift era Non-GRB science with Swift GRB research at Leicester
Spacecraft status Swift in the press Swift Videos
Support
Helpdesk TOO requests Guest Investigator program Target visibility checker Search transient database
Data Access
Overview Quick Look GCN Notices Download obs data Search obs catalogue The 2SXPS catalogue The LSXPS catalogue
Data Analysis
Data analysis overview Swift software
Build XRT products
BAT data analysis guide XRT data analysis guide XRT digest UVOT data analysis guide
Data Products
GRBs Full dataset Swift XRT products for GRBs XRT positions XRT light curves XRT spectra XRT GRB catalogue XRT GRB images Burst analyser Prompt data GRB field info XRT prompt analysis External triggers Einstein Probe follow up SVOM follow up Neutrino follow up Gravitational Wave follow up
Publications
Publication index Published papers Submitted papers XRT instrument papers ATels GCNs Conferences
Links
Databases NED Simbad GCN circulars archive GRB data table Software & Tools Swift Software (HEASoft) Xanadu WebPIMMS Institutional Swift Sites GSFC PSU OAB SSDC MSSL University of Leicester

Swift J091211.2-274429

Classification: Confirmed transient

Total | Soft | Medium | Hard | Exposure

Postage stamp image of Swift J091211.2-274429

This image is 160 pixels (=6.3′ to a side).
Swift J091211.2-274429 is indicated by the cross-hairs.

Detection flag:: Good
RA (J2000):: 09^h 12^m 11.20^s=138.0467°
Dec (J2000):: -27° 44′ 29.4″=-27.7415°
Err₉₀:: 5.3′′
l:: +254° 44′ 10.4″=254.7362°
b:: +13° 59′ 02.9″=+13.9841°
LSXPS_ID:: LSXPS J091211.0-274427.
First detected:: 2024-07-01 11:07:49
Obs 00092589002
Discovery time: 2024-07-02 08:44:54
Peak rate: 1.4 (±0.4) ×10^-2 (0.3 — 10 keV)
Historical upper limits: 3.99 ×10^-3 (0.3 — 10 keV; 3-σ)
(from LSXPS [10000018925]) [Show all limits].
LSXPS:: 3.99 ×10^-3 ct/sec (0.3—10 keV)
(10000018925)
XMM:
Canned: 4.57 ×10^-2 ct/sec (0.3—10 keV)
Disc spec: 5.54 ×10^-2 ct/sec (0.3—10 keV)
Full spec: 4.99 ×10^-2 ct/sec (0.3—10 keV)
Native: 0.71 ct/sec (native, 0.2—12 keV)
Mode / filter: SLEW, pn, Medium
ROSAT:
Canned: 1.63 ×10^-2 ct/sec (0.3—2 keV)
2.09 ×10^-2 ct/sec (0.3—10 keV)
Disc spec: 1.93 ×10^-2 ct/sec (0.3—2 keV)
2.73 ×10^-2 ct/sec (0.3—10 keV)
Full spec: 1.89 ×10^-2 ct/sec (0.3—2 keV)
3.04 ×10^-2 ct/sec (0.3—10 keV)
Native: 3.54 ×10^-2 ct/sec (native, 0.2—2 keV)
Outburst significance: 2.81 σ
Search 5-σ radius: SIMBAD |Vizier.
XRT Team comments:: None

Light curve (0.3 — 10 keV)

GRB binning | ObsID binning | Snapshot binning.

Show plot axis controls or click to zoom [more].

Spectrum - discovery observation only

Download tar file

Discovery spectrum of Swift J091211.2-274429

N_H	4.6 (+12.0, -4.6) × 10²¹ cm^-2
z of absorber	0
Photon index	2.8 (+2.3, -1.5)
Flux (0.3-10 keV) (Observed)	4.1 (+4.6, -1.9) × 10^-13 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	1.2 (+5.9, -0.7) × 10^-12 erg cm^-2 s^-1
Counts to flux (obs)	2.46 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	7.04 × 10^-11 erg cm^-2 ct^-1
W-stat What's this?(dof)	7.53 (11)
Spectrum exposure	1.5 ks

Spectrum - all available data

Download tar file

Discovery spectrum of Swift J091211.2-274429

N_H	5.0 (+17.4, -5.1) × 10²⁰ cm^-2
z of absorber	0
Photon index	1.5 (+0.5, -0.4)
Flux (0.3-10 keV) (Observed)	3.0 (+1.0, -0.8) × 10^-13 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	3.2 (+0.8, -0.6) × 10^-13 erg cm^-2 s^-1
Counts to flux (obs)	4.28 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	4.54 × 10^-11 erg cm^-2 ct^-1
W-stat What's this?(dof)	60.72 (89)
Spectrum exposure	21.8 ks

Data for your light curve

Swift J091211.2-274429 — binning.