Skip to main content
JSON Notices via Email, Kafka Cron Jobs, Submitter Profile, GCN is Hiring. See news and announcements

GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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').
Advanced Search

To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

32692 results found.

  1. GRB 260228A: further EP-FXT observations and X-ray afterglow confirmation
  2. GRB 260303A: 1.3m DFOT optical upper limit (duplicate submission)
  3. GRB 260303A: 1.3m DFOT optical upper limit
  4. EP260214b: ATCA 6 GHz observations
  5. GRB 260211A: SVOM/VT optical rebrightening at 20 days after the burst, SN candidate
  6. GRB 260303A: SVOM/ECLAIRs refined analysis
  7. Fermi GRB 260305A: Global MASTER-Net observations report
  8. GRB 260303B: AstroSat CZTI detection
  9. GRB 260303A: SVOM/VT optical observations
  10. GRB 260303A: J-band observations with WINTER
  11. GRB 260303B: NuSTAR detection of prompt emission
  12. EP260302a: Global MASTER-Net observations report
  13. Fermi GRB 260303B: Global MASTER-Net observations report
  14. IceCube-260217A: No Candidate Transients from the Zwicky Transient Facility
  15. GRB 260228A: SVOM/ECLAIRs refined analysis
  16. GRB 260225A: SVOM/ECLAIRs refined analysis
  17. EP260302a: analysis of the follow-up EP-FXT observation
  18. EP260227a: Gemini-South optical observations
  19. EP260302a: LCO observations
  20. EP260302a: BOOTES-7 optical counterpart detection at early times
  21. GRB 260303A: SVOM/COLIBRÍ (FM-GFT) optical counterpart candidate
  22. GRB 260228A: EP-FXT follow-up observation
  23. GRB 251130B: TERI Gamma-ray detection
  24. GRB 260208A: TERI Gamma-ray detection
  25. EP260227a: Mondy optical observations
  26. GRB 260228A: SVOM/COLIBRÍ (FM-GFT) optical upper limit
  27. EP260227a: Mephisto optical detection
  28. GRID detection of GRB 260225D
  29. EP-WXT trigger 01709258652: 50cm Telescope multi-band observations
  30. EP260227a: further LCO observations
  31. EP260227a: SVOM/VT optical observation
  32. GRB 260228A: SVOM/VT optical upper limits
  33. GRB 260225D: SVOM/GRM observation
  34. EP260227A: 3.6m DOT optical afterglow detection
  35. GRB 260225B: SVOM/GRM observation
  36. EP260227a: FTW optical and NIR observations
  37. EP260227a: Liverpool Telescope optical observations
  38. EP260227a: LCOGT Optical Observations
  39. GRB 260226A: Asiago r-band upper limit
  40. EP260227a: Thai National Telescope observations
  41. EP260227a: likely GTC/OSIRIS+ redshift z = 2.714
  42. EP260227a: Liverpool Telescope observations
  43. EP260227a: COLIBRÍ optical observations
  44. EP260227a: NOT optical observations
  45. GRB 260225A: SVOM/VT optical continued observations and upper limit
  46. GRID detection of GRB 260223A
  47. EP260227a: Global MASTER-Net observations report
  48. EP260227a: Einstein Probe detection of an X-ray transient and refined analysis
  49. The EP-WXT trigger 01709258681 (EP260227a?): Las Cumbres follow-up observation of the optical counterpart
  50. GRB 260226A: Insight-HXMT/HE detection of the very bright burst
  51. Konus-Wind detection of GRB 260226A
  52. GRB 260223A: 7DT detection and Medium-band SED of Afterglow
  53. EP260214a: VLT/FORS2 optical observations
  54. GRB 260225A: WINTER J-band upper limit
  55. GRB 260226A: CALET Gamma-Ray Burst Monitor detection
  56. GRB 260226A: COLIBRÍ optical upper limits
  57. GRB 260226A: LCOGT Optical Upper Limit
  58. EP-WXT trigger 01709258652: SVOM/C-GFT confirmation of a stellar flare
  59. GRB 260226A: Glowbug gamma-ray detection
  60. GRB 260226A: NuSTAR detection of bright prompt emission
  61. GRB 260226A : GROWTH-India Telescope optical observations
  62. GRB 260226A: LAST optical upper limit
  63. GRB 260226A: Fermi GBM observation
  64. GRB 260226A: Fermi-LAT refined analysis
  65. Fermi GRB 260226A: Global MASTER-Net observations report
  66. GRB 260226A: AstroSat CZTI detection of bright long burst
  67. EP260214a: VLA 6 GHz detection
  68. GRB 260226A: Fermi-LAT detection of a bright burst
  69. EP260224a: LCO optical upper limits
  70. GRB260225A: SVOM/ECLAIRs refined position
  71. GRB 260225A: EP-FXT follow-up observation
  72. GRB 260225A: SVOM/VT optical observation
  73. GRB 260225A: SVOM/COLIBRÍ (FM-GFT) Detection of an Optical Counterpart Candidate
  74. GRB 260223A: Fermi GBM Observation
  75. GRB 260225A: SVOM/VT optical upper limits
  76. EP260126a: VLA 6 GHz detection
  77. EP260223a: Liverpool Telescope upper limits
  78. GRB 260225A: SVOM/COLIBRÍ (FM-GFT) optical upper limits
  79. EP 260225.148: COLIBRÍ Confirmation of flaring star
  80. EP260223a: Xinglong optical upper limit
  81. GRB 260223A: Glowbug gamma-ray detection
  82. EP260213a: Mephisto optical upper limits
  83. EP260223a: EP-FXT follow-up observation
  84. sb26021801: SVOM/VT optical upper limits
  85. GRB 260223A: COLIBRÍ optical afterglow decay confirmation
  86. sb26021801: SVOM/C-GFT upper limit
  87. EP260223a: COLIBRÍ optical upper limits
  88. GRB 260223A: SVOM/VT optical observation
  89. GRB 260223A: SVOM/GRM observation
  90. GRB 260223A: COLIBRÍ further optical observations and a brightening
  91. EP260221a: Optical upper limit with Kinder observations
  92. GRB 260223A: COLIBRÍ optical observations
  93. GRB 260223A: DDOTI Optical Candidate
  94. Fermi GRB 260223A: Global MASTER-Net observations report
  95. EP260221a: Liverpool Telescope detection of COLIBRÍ counterpart candidate
  96. EP260221a: COLIBRÍ optical counterpart candidate
  97. EP260221a: Gemini South z-band upper limit
  98. EP260221a: Global MASTER-Net observations report
  99. EP260221a: EP-FXT follow-up observation
  100. Fermi GRB 260221B: Global MASTER-Net observations report

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
Questions or comments?
Contact GCN directly.
Have you found a bug in GCN?
Open an issue.
Want to contribute code to GCN?
Get involved on GitHub.

gcn.nasa.gov

A service of the Astrophysics Science Division at NASA Goddard Space Flight Center

Looking for U.S. government information and services? Visit USA.gov