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"

12387 results found.

  1. GRB 261028A: Fermi GBM Final Localization
  2. GRB 261026B: AstroSat CZTI detection
  3. GRB 261024A: SVOM/GRM observation
  4. GRB 261026B: NuSTAR detection of prompt emission
  5. GRB 261026C: Fermi GBM Final Real-time Localization
  6. GRB 261020A: Insight-HXMT/HE detection
  7. GRB 261019A: GECAM-B observation
  8. GRB 261019A: SVOM/GRM observation
  9. Fermi GRB 261026B: Global MASTER-Net observations report
  10. GRB 261026B: Fermi GBM Final Real-time Localization
  11. GRB 261024A: NuSTAR detection of prompt emission
  12. GRB 261025B: Fermi GBM Final Real-time Localization
  13. GRB 261025A: Fermi GBM Final Localization Correction
  14. GRB 261024B: Fermi GBM Final Real-time Localization
  15. GRB 261024A: BALROG localization (Fermi Trigger 814551785 / GRB 261024683)
  16. GRB 261024A: Fermi GBM Final Real-time Localization
  17. GRB 261019A: Insight-HXMT/HE detection
  18. IceCube-261020A: Upper limits from a search for additional neutrino events in IceCube
  19. GRB 261017A: SVOM/GRM observation
  20. GRB 261021A: Fermi GBM Final Real-time Localization
  21. Fermi-LAT Gamma-ray Observations of IceCube-261020A
  22. GRB 261020A: Fermi GBM Observation
  23. GRB 261017A: SAO RAS optical upper limit
  24. GRB 261017A: COLIBRÍ optical upper limit
  25. IceCube-261020A - IceCube observation of a high-energy neutrino candidate track-like event
  26. GRB 261020A: MAXI GSC detection
  27. GRB 261020A: Fermi GBM Final Real-time Localization
  28. Konus-Wind detection of GRB 261017A
  29. GRB 261019A: Fermi GBM Final Localization
  30. GRB 261017A: Luminance-band upper limit from a 28cm telescope in Chengde
  31. GRB 261017A: a short minimum variability timescale compatible with a compact object merger origin
  32. GRB 261017A: J band upper limit by the SYSU 80cm infrared telescope
  33. GRB 261017A : MITSuME Akeno optical upper limits
  34. GRB 261017A: Nanshan/NEXT optical upper limit
  35. GRB 261017A: Fermi GBM Observation
  36. GRB261010A: Retraction of Keck/MOSFIRE near-IR source
  37. GRB 261017A: Fermi GBM Final Real-time Localization
  38. GRB 261010A: Pan-STARRS z-band imaging and upper limit
  39. GRB 261010A: VLA radio observations
  40. GRB261010A: Keck/MOSFIRE detection of a near-IR source
  41. GRB 261010A: LBT tentative near-infrared detection
  42. GRB 261010A: Glowbug gamma-ray detection
  43. GRB 261008A: SVOM/GRM observation
  44. GRB 261009A: GECAM-B detection of a burst
  45. IceCube-261012A: Upper limits from a search for additional neutrino events in IceCube
  46. GRB 261010A: a short minimum variability timescale and a distinct pulse evolution compatible with a merger origin
  47. GRB 261013A: Fermi GBM Final Real-time Localization
  48. Fermi-LAT Gamma-ray Observations of IceCube-261012A
  49. GRID detection of GRB 261010A
  50. GRB 261011B: GECAM-B observation
  51. GRB 261010A: J-band upper limit by the SYSU 80cm infrared telescope
  52. IceCube-260919A: No transient candidates from the Zwicky Transient Facility
  53. GRB 261010A: a Type I-L (merger-driven) GRB candidate
  54. IceCube-261012A - IceCube observation of a high-energy neutrino candidate track-like event
  55. GRB 261010A: 10.4m GTC spectroscopy of the galaxy 2" from the afterglow
  56. Konus-Wind detection of GRB 261010A
  57. Konus-Wind detection of GRB 261007A/EP261007a
  58. GRB 261010A: NOT confirmation of the optical afterglow
  59. GRB 261010A: Fermi GBM Observation
  60. GRB 261011B: Fermi GBM Final Localization
  61. GRB 261010A: possible optical afterglow detected with the 1.5m OSN
  62. GRB 261010A: NOT possible optical counterpart
  63. GRB 261010A: Fermi GBM Final Real-time Localization
  64. GRB 261009A: Fermi GBM Final Real-time Localization
  65. GRB 261008A: GECAM-B observation
  66. GRB 261007A: SVOM/ECLAIRs refined analysis
  67. GRB 261007A: Glowbug gamma-ray detection
  68. GRB 261008A: Fermi GBM Final Real-time Localization
  69. GRB 261007A: NOT optical observations
  70. GRB 261007A: SVOM/GRM observation
  71. GRB 261007A / EP261007a: AstroSat CZTI detection
  72. GRB 261005A: GECAM-B observation
  73. GRB 261007A / EP261007a: SVOM/VT optical observations
  74. GRB 261007A / EP261007a: NuSTAR detection of prompt emission
  75. GRB 261007A / EP261007a: ULL-ASTRO-MASTER detection of the optical afterglow with LCO 40-cm telescope at McDonald Observatory
  76. GRB 261007A / EP261007a: TRT optical observations
  77. GRB 261007A / EP261007a: LCO optical observations
  78. GRB 261007B: Fermi GBM Final Real-time Localization
  79. GRB 261007A: Fermi GBM observation
  80. GRB 261005A: Glowbug gamma-ray detection
  81. GRB 261005B: Fermi GBM Observation
  82. GRB 261005A: Fermi GBM Final Real-time Localization
  83. GRB 261003A: Glowbug gamma-ray detection of a likely short burst
  84. GRB 261002A: Fermi GBM Final Localization
  85. GRB 260930B: SVOM/GRM observation
  86. GRB 260921B: GECAM-B observation
  87. GRB 260930B: GECAM-B detection of a burst
  88. Fermi GRB 261003A: Global MASTER-Net observations report
  89. GRB 261003A: Fermi GBM Final Real-time Localization
  90. Fermi-LAT Gamma-ray Observations of IceCube-260930A
  91. Fermi GBM Detection of GRB 260919A / EP260920a
  92. IceCube-260930A: Upper limits from a search for additional neutrino events in IceCube
  93. IPN triangulation of GRB 260919A / EP260920a
  94. Fermi GRB 260930B: Global MASTER-Net observations report
  95. GRB 260926C: SVOM/GRM observation
  96. GRB 260930B: Fermi GBM Final Real-time Localization
  97. GRB 260930A: Fermi GBM Final Real-time Localization
  98. IceCube-260930A - IceCube observation of a high-energy neutrino candidate track-like event
  99. GRB 260926C: AstroSat CZTI detection
  100. GRB 260926C: GECAM-B observation

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