Skip banner and navigation tools.

Home > GRB region information > 1299965

Swift Trigger: 1299965

Presumed name: GRB 250331B

Back to trigger list.

Related pages: Burst Analyser | Enhanced position | Light curve | Spectrum | Image | Download obs data | GCN Notices

BAT	04h 45m 31.44s, +43° 48′ 18.0″
position:	(71.381, +43.805 ± 180″)
XRT	04h 45m 29.66s, +43° 48′ 38.9″
position:	(71.3736, +43.8108 ± 1.9″)
UVOT	No position available.
Galactic NHI:	5.12×1021 cm-2
Galactic E(B-V):	0.907 mag

Best RA:	04h 45m 29.66s	= 71.3736 d
Best Dec:	+43° 48′ 38.9″	= +43.8108 d
Gal Lat:	-1.13
Gal Long:	160.92
Sun angle:	67.11°, -4.1 hr East of Sun

---

GCN Notices for this burst.

View this region in Aladin.

Observability of this burst for Swift.

---

Sun angle for this burst.

UVOT data

No UVOT images are currently available.

---

XRT SPER data

SPER results page for this trigger.

There are 5 SPER messages, and 1 objects have been found

• • Object 1 - enhanced position.
  • RA (J2000) : 04 45 29.67 (43.81080)
  • Dec (J2000): +43 48 38.9 ( 43.81100)
  • Error (90%): 1.9
  • Counts in Source: 8

See the SPER page for details of how this position was produced.

---

Known transients within 5′ of the GRB

Click on the offset to view the transient announcement.

Offset (′′)	RA	Dec	Date reported	Source	Misc	Query

---

Catalogue Searches. Searched 200′ around XRT position

Click on the distance to view the full details (not available for sources from the SSS catalogue). Click on the column headers to sort the table on that column (click again to invert sort order).

SIMBAD

	RA*	Dec*	SIMBAD name		Query
90.0	71.3979	43.7930	TYC 2905-174-1	B=11.77, G=11.035358, H=9.508, J=9.753, K=9.375, V=11.02
96.4	71.3993	43.8301	ZTF J044535.82+434948.4	g=20.045, r=18.606
121.2	71.3366	43.7903	UCAC3 268-64818	B=15.25, G=14.112068, R=14.27, V=14.19
129.1	71.3381	43.7857	HD 29957	B=9.41, G=6.727836, H=3.163, J=4.053, K=2.872, V=7.65
144.5	71.3343	43.7824	UCAC3 268-64817	G=13.719663, R=14.26
156.4	71.4033	43.8486	ZTF J044536.80+435054.8	g=19.050, r=17.433
180.5	71.4419	43.8017	ZTF J044546.06+434806.1	g=14.108, r=13.459

There are 7 SIMBAD objects within the position error. The full list is here.

* RA/Dec in equinox J2000

X-ray sources

	RA*	Dec*		Source table2	Observatory	Query

Queried the X-ray MASTER catalogue.

* RA/Dec in equinox J2000

¹Energy band for count-rate is mission specific.

Galaxies

	RA*	Dec*	Redshift		Catalogue	Query
10.2	71.3767	43.8125			NED
12.2	71.3762	43.8081			NED
13.1	71.3696	43.8128			NED
21.9	71.3767	43.8053			NED
22.6	71.3769	43.8050		B2=20.5, I=17.8, R1=18.5, R2=18.4	USNO-B1
27.2	71.3838	43.8125			NED
45.6	71.3911	43.8102		I=18.5, R1=19.3, R2=19.3	USNO-B1
46.0	71.3767	43.7983			NED
46.0	71.3846	43.8008			NED
46.4	71.3912	43.8103			NED

Queried APM-N, SDSS, PSCz, SSS, NED, 2MASSX, USNO-B1.

There are 330 galaxies within the position error. The full list is here.

* RA/Dec in equinox J2000

Magnitudes depend on the catalogue. e.g. For Sloan, R is the Sloan r mag, not the Johnson R from APM, for example

Stars

	RA*	Dec*		Catalogue	Query
10.2	71.3768	43.8124	h=14.8, j=15.2, k=14.8	2MASS
10.3	71.3768	43.8125	B1=19.3, B2=18.1, I=16.3, R1=16.9, R2=16.7	USNO-B1
11.9	71.3764	43.8082	B1=16.5, B2=16.0, I=14.4, R1=14.7, R2=14.3	USNO-B1
12.1	71.3765	43.8082	h=12.5, j=12.9, k=12.4	2MASS
13.1	71.3695	43.8129	h=15.3, j=15.7, k=15.0	2MASS
13.2	71.3695	43.8129	B1=20.0, B2=19.4, I=17.2, R1=17.9, R2=17.4	USNO-B1
21.9	71.3769	43.8052	h=16.2, j=16.6, k=15.7	2MASS
26.8	71.3836	43.8126	h=14.2, j=14.4, k=14.1	2MASS
27.6	71.3839	43.8127	B1=17.3, B2=16.8, I=15.1, R1=15.7, R2=15.4	USNO-B1
46.0	71.3768	43.7982	h=15.7, j=16.7, k=15.4	2MASS

Queried USNO-B1, SDSS, 2MASS.

There are 400 stars within the position error. The full list is here.

* RA/Dec in equinox J2000

Magnitudes depend on the catalogue. e.g. For Sloan, R is the Sloan r mag, not the Johnson R from APM, for example.