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"

14928 results found.

  1. GRB 231123C: Insight-HXMT/HE detection
  2. GRB 231123C (short): Glowbug gamma-ray detection
  3. GRB 231124A: Glowbug gamma-ray detection
  4. GRB230728A: VIRT optical upper limit
  5. GRB 231123C: Swift/BAT-GUANO detection of a short burst likely outside the coded FOV
  6. GRB 231124A: CALET Gamma-Ray Burst Monitor detection
  7. GRB 231115A: XMM-Newton observation
  8. GRB 231124A: Fermi GBM Final Real-time Localization
  9. GRB 231123A: AstroSat CZTI detection
  10. GRB 231123C: Fermi GBM Final Real-time Localization
  11. GRB 231123B: Fermi GBM Final Real-time Localization
  12. GRB 231118A: REM optical afterglow detection
  13. GRB 231122B: AstroSat CZTI detection
  14. GRB 231122B: CALET Gamma-Ray Burst Monitor detection
  15. GRB 231122B: Swift/BAT-GUANO detection of a long burst outside the coded FOV
  16. GRB 231117A: Chandra afterglow detection
  17. GRB 231123A: Fermi GBM Final Real-time Localization
  18. GRB 231122B: Glowbug gamma-ray detection
  19. GRB 231122A: GECAM detection
  20. GRB 231122B: GECAM detection
  21. GRB 231122A: Fermi GBM Final Real-time Localization
  22. GRB 231118A: ATCA detection of radio counterpart
  23. GRB 231118A: GRBAlpha detection
  24. GRB 231118A: VZLUSAT-2 detection
  25. Konus-Wind detection of GRB 231020A
  26. GRB 231118B: CALET Gamma-Ray Burst Monitor detection
  27. GRB 231117A: CALET Gamma-Ray Burst Monitor detection
  28. 231118A: Swift-UVOT Detection
  29. GRB231117A: Swift-UVOT detection
  30. GRB 231117A : MITSuME Akeno optical afterglow candidate detection
  31. GRB 231120A: Fermi GBM Final Real-time Localization
  32. GRB 231118A: MeerLICHT afterglow detection
  33. GRB 231118A: VLT/X-shooter redshift
  34. GRB 231117A: MAAO 0.7-m telescope optical upper limit
  35. GRB 231117A: GECAM-C detection
  36. GRB 231118A: AstroSat CZTI detection
  37. GRB 231115A: Upper limit from CALET Gamma-Ray Burst Monitor
  38. GRB 231117A: 10 GHz VLA detection
  39. GRB 231118A: Las Cumbres optical detection
  40. GRB 231118B: Fermi GBM Final Real-time Localization
  41. GRB 231118A: Continued Skynet Observations
  42. GRB 231117A: Kinder observations with Lulin observatory for AT 2023yba without fading in r band
  43. GRB 231118A: Swift detection of a burst
  44. GRB 231118A: Fermi GBM Final Real-time Localization
  45. GRB 231117A: ATCA detection of a radio counterpart
  46. GRB 231117A: GRBAlpha detection
  47. GRB 231117A: afterglow candidate detection from Kinder observations with Lulin observatory
  48. GRB 231117A (short): Glowbug gamma-ray detection
  49. GRB 231117A: ATLAS non-detection of an optical counterpart
  50. Konus-Wind detection of GRB 231117A (short/hard)
  51. GRB 231115A: optical observations from INAF observatories
  52. GRB 231117A: AGILE detection of a bright short burst
  53. GRB 231117A: AstroSat CZTI detection of a bright short burst
  54. GRB 231117A: Swift detection of a bright short burst
  55. GRB 231115A: Non-detection of radio emission with CHIME/FRB
  56. GRB 231111A: Swift/UVOT Detection
  57. MAGIC observation of GRB 231115A, a possible magnetar giant flare
  58. GRB 231115A: Swift/BAT-GUANO detection of a short burst
  59. GRB 231115A: Swift-XRT and Swift-UVOT observations
  60. Konus-Wind detection of GRB 231115A (a probable Magnetar Giant Flare from M82)
  61. GRB 231115A: Insight-HXMT/HE detection
  62. GRB 231115A: GBM/Fermi Observations of a probable Giant Flare of Magnetar
  63. GRB 231116A: Fermi GBM Final Real-time Localization
  64. GRB 231115A / AT2023xvj: Updated GIT analysis
  65. GRB231115A: GRANDMA Observations
  66. GRB 231115A: Non-detection in low-latency of gravitational waves with LIGO/Virgo/KAGRA
  67. GRB 231106A: TESS identification of candidate optical counterpart
  68. GRB 231115A (short): Glowbug gamma-ray detection
  69. GRB 231115A: Fermi GBM Final Real-time Localization
  70. LIGO/Virgo/KAGRA S231113bw: Zwicky Transient Facility observations
  71. GRB 231113A (short): Glowbug gamma-ray detection
  72. GRB 231114A (short): Glowbug gamma-ray detection
  73. GRB 231114A: Fermi GBM Final Localization
  74. LIGO/Virgo/KAGRA S231113bw: Upper limits from Fermi-GBM Observations
  75. GRB 231110A: CALET Gamma-Ray Burst Monitor detection
  76. GRB231111A: MDM 2.4m Hiltner Telescope Observation
  77. GRB 231106A: Glowbug gamma-ray detection
  78. GRB 231111A: Afterglow redshift from OSIRIS+/GTC
  79. GRB 231104A: VZLUSAT-2 detection
  80. GRB 231111A: TNG tentative redshift
  81. GRB 231110A: Glowbug gamma-ray detection
  82. GRB 231110A: AstroSat CZTI detection
  83. GRB231111A: Optical follow-up observations with Mephisto
  84. GRB 231106B: GRBAlpha detection
  85. GRB 231111A: Osservatorio Astronomico "Nastro Verde" optical observations with detection of an optical counterpart
  86. GRB 231110A: Terskol Zeiss-2000 optical upper limit
  87. GRB 231111A: GECAM-C detection of a long burst (correction)
  88. GRB 231110A: GECAM-B detection (correction)
  89. GRB 231111A: GECAM-C detection of a long burst
  90. GRB 231110A: GECAM detection
  91. GRB 231110A: SAO RAS optical observations
  92. GRB 231110A: Swift-XRT afterglow detection
  93. GRB231111A: YAHPT Observations
  94. GRB231111A: GIT confirmation of the optical afterglow
  95. GRB 231111A: MASTER OT earlier detection
  96. GRB 231111A: Swift detection of a burst with an optical counterpart
  97. GRB231110A: WFST Observation and upper limits
  98. GRB 231110A: Swift detection of a burst
  99. GRB 231109A: Fermi GBM Final Localization
  100. GRB 231108A: 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