GCN Circulars
GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. See the documentation for help with subscribing to or submitting Circulars.
Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
22 results found.
- GRB 250226A: Mondy AZT-33IK and Koshka Zeiss-1000 Optical Upper Limits
- GRB 250226A: Swift/BAT-GUANO localization skymap of a long GRB
- GRB 250226A: GRANDMA Optical Observations
- Konus-Wind detection of GRB 250226A
- GRB 250226A: KAO Optical Upper Limit
- GRB 250226A: AbAO AS-32 Optical Upper Limit
- GRB 250226A: Fermi GBM Observation
- GRB 250226A / EP250226a: LCO detection of the afterglow
- EP250226a/GRB 250226A: INTEGRAL SPI-ACS and PICsIT detection
- EP250226a/GRB 250226A:Xinglong optical follow-up observations
- EP250226a / GRB 250226A: SVOM/VT optical observations
- EP250226a/GRB 250226A: refined analysis of the EP-WXT and FXT observations
- EP250226a/GRB 250226A: 1.6m Mephisto observations
- EP250226a/GRB 250226A: Kinder optical follow-up observations
- GRB 250226A: GECAM-B detection
- EP250226a/GRB 250226A: GSP detects optical counterpart
- EP250226a/GRB 250226A: COLIBRÍ/DDRAGO Detection of the Optical Counterpart
- EP250226a / GRB 250226A: VLT/X-shooter redshift of z = 3.315
- EP250226a / GRB 250226A: TRT optical counterpart observation
- EP250226a/GRB 250226A: EP-WXT detection and FXT follow-up observation of an X-ray transient
- Fermi GRB 250226A: Global MASTER-Net observations report
- GRB 250226A: Fermi GBM Final Real-time Localization