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"

14936 results found.

  1. GRB 230817A: Fermi GBM Final Real-time Localization
  2. GRB 230812B: optical photometry from Konkoly
  3. GRB230816A: Possible host and GIT detection of optical counterpart
  4. IPN triangulation of GRB 230815B
  5. GRB 230816A: Nanshan/HMT optical afterglow detection
  6. GRB 230815A: SOAR/Goodman follow-up imaging
  7. GRB 230816A: Swift detection of a burst
  8. GRB 230815B: GECAM-B and GECAM-C detection of a burst
  9. GRB 230815B: AstroSat CZTI detection
  10. GRB230815A: BOOTES-6/DPRT optical upper limit
  11. GRB 230815A: Fermi GBM detection
  12. GRB 230815A: Swift detection of a burst
  13. GRB 230812B: AMI-LA radio detection of afterglow candidate
  14. GRB 230812B: Optical observaions from Rozhen Observatory
  15. GRB 230814A: Fermi GBM Final Real-time Localization
  16. GRB 230812B: OASDG optical observations
  17. Konus-Wind detection of GRB 230812B
  18. GRB230812B: AGILE/MCAL detection
  19. GRB 230812B: Swift-XRT afterglow detection
  20. GRB 230812: Swift/UVOT Detection
  21. GOTO confirmation and possible host galaxy of GRB230812B optical afterglow
  22. GRB 230812B: Zwicky Transient Facility Identifies Optical Afterglow Candidate of a Fermi GRB (Trigger 713559497)
  23. GRB 230812B: Fermi-LAT detection
  24. GRB 230812B: Fermi GBM detection of an extremely bright GRB
  25. GRB 230812B: Fermi GBM Final Real-time Localization
  26. GRB 230812A: Fermi GBM Final Real-time Localization
  27. GRB 230808A: Fermi GBM Detection
  28. LIGO/Virgo/KAGRA S230810af: Retraction of GW compact binary merger candidate
  29. GRB 230805B: AstroSat CZTI detection
  30. GRB 230808A: Swift/BAT-GUANO detection of a burst
  31. GRB 230808B: Fermi GBM Final Real-time Localization
  32. GRB 230808A: Fermi GBM Final Real-time Localization
  33. GRB 230807A: Fermi GBM Final Real-time Localization
  34. Konus-Wind detection of GRB 230803A
  35. GRB 230806A: Fermi GBM Final Localization
  36. GRB 230805B: BOOTES-6/DPRT optical upper limit and 1.5m OSN detection
  37. GRB 230805B: Swift detection of a burst
  38. GRB 230805A: Fermi GBM Final Real-time Localization
  39. GRB 230802B: AstroSat CZTI detection
  40. GRB 230804A: Fermi GBM Final Real-time Localization
  41. IPN triangulation of GRB 230803A
  42. GRB 230803A: AstroSat CZTI detection
  43. LIGO/Virgo/KAGRA S230802aq: AstroSat CZTI non-detection and upper limits
  44. GRB 230803A: Fermi GBM Final Real-time Localization
  45. GRB 230802B: Fermi GBM Final Localization
  46. GRB 230802A: BOOTES-5/JGT optical upper limit
  47. LIGO/Virgo/KAGRA S230802aq: Upper limits from Fermi-GBM Observations
  48. GRB 230802A: Swift detection of a burst
  49. LIGO/Virgo/KAGRA S230731an: AstroSat CZTI non-detection and upper limits
  50. GRB 230731A: Fermi GBM Final Real-time Localization
  51. GRB 230723A: Detection of candidate millimeter-band radiation by SPT-3G
  52. GRB 230728A: Swift-BAT refined analysis
  53. GRB 230723B: MITSuME Ishigaki optical observation
  54. GRB 230728A: BOOTES-1 optical upper limit
  55. GRB 230727A: AstroSat CZTI detection
  56. GRB 230728A: Swift detection of a burst
  57. GRB 230727A: Swift/BAT-GUANO detection of a burst
  58. IceCube-230727A - IceCube observation of a high-energy neutrino candidate track-like event
  59. GRB 230727A: Fermi GBM Final Real-time Localization
  60. GRB 230723B: Further CAHA observations and host galaxy detection
  61. Konus-Wind detection of GRB 230723A
  62. GRB 230723B: MITSuME Akeno optical afterglow candidate detection
  63. IceCube-230724A - IceCube observation of a high-energy neutrino candidate track-like event
  64. IceCube-230725A - IceCube observation of a high-energy neutrino candidate track-like event
  65. IPN triangulation of GRB 230723A (short)
  66. GRB 230725B: Fermi GBM Final Real-time Localization
  67. GRB 230725A: Fermi GBM Final Real-time Localization
  68. GRB 230724A: Fermi GBM Final Real-time Localization
  69. GRB 230723A: AGILE/MCAL detection
  70. GRB 230723B: Swift detection of a burst
  71. GRB 230723A: Fermi GBM Final Real-time Localization
  72. GRB 230718A: Final Localization Correction
  73. GRB 230718A: Fermi GBM Final Real-time Localization
  74. IPN triangulation of GRB 230712A (short)
  75. GRB 230717A: Fermi GBM Final Real-time Localization
  76. LIGO/Virgo/KAGRA S230715bw: Retraction of GW compact binary merger candidate
  77. GRB 230715A: Fermi GBM Final Real-time Localization
  78. IceCube-230707A : MAXI upper limit and NICER follow-up observation of Swift J1753.5-0127
  79. GRB 230713A: Fermi GBM Final Real-time Localization
  80. GRB 230709B: CALET Gamma-Ray Burst Monitor detection
  81. GRB 230703A: CALET Gamma-Ray Burst Monitor detection
  82. GRB 230709C: Swift/BAT-GUANO detection of a short burst outside the coded FOV
  83. GRB 230712B: Fermi GBM Final Localization
  84. GRB 230712A: Fermi GBM Final Real-time Localization
  85. GRB 230709C: GRBAlpha detection
  86. GRB 230709B: GRBAlpha detection
  87. GRB 230709C: Fermi GBM Detection
  88. GRB 230709C: Fermi GBM Final Localization
  89. GRB 230710A: Fermi GBM Final Real-time Localization
  90. IceCube-230707A: No candidates detected by Swift-XRT
  91. GRB 230709C: AstroSat CZTI detection
  92. GRB 230707B: CALET Gamma-Ray Burst Monitor detection
  93. GRB 230628C: GRID Detection
  94. IceCube-230708A - IceCube observation of a high-energy neutrino candidate track-like event
  95. GRB 230707B: Swift/BAT-GUANO detection of a burst outside the coded FOV
  96. IceCube-230707B - IceCube observation of a high-energy neutrino candidate track-like event
  97. GRB 230707B: Fermi GBM Final Real-time Localization
  98. IceCube-230707A - IceCube observation of a high-energy neutrino candidate track-like event
  99. GRB 230707A: Fermi GBM Detection
  100. GRB 230707A: Fermi GBM Final Real-time Localization

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