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"

36116 results found.

  1. GRB 180222A: A long GRB detected by INTEGRAL
  2. GRB 180222A: Swift detection of a burst
  3. Swift trigger 811074 (possible GRB 180221A): Swift refined analysis
  4. GRB 180205A: Mondy optical observations
  5. GRB 180219A CALET Gamma-Ray Burst Monitor detection
  6. GRB180221A: MASTER-OAFA optical observations
  7. Swift Trigger 811074: possible GRB 180221A
  8. Konus-Wind observation of GRB 180218A
  9. GRB 180218A CALET Gamma-Ray Burst Monitor detection
  10. GRB 180218A: Fermi GBM Detection
  11. IPN Triangulation of GRB 180218A (long/bright)
  12. GRB 180204A: 15 GHz upper limits from AMI
  13. GRB 180112A: AstroSat CZTI detection
  14. Konus-Wind observation of GRB 180210A
  15. GRB 180205A: SEDM Observations
  16. GRB 180210A: Swift-XRT afterglow detection
  17. GRB 180210A: Tiled Swift observations
  18. GRB 180205A: BAO optical observations
  19. GRB 180210A: Swift ToO observations
  20. GRB 180210A: Fermi-LAT detection
  21. GRB 180210A: Fermi GBM detection
  22. Trigger 809217: Swift trigger on RS CVn Star HD 8357
  23. GRB180205A: Optical observations with DOAO 1m telescope
  24. GRB 180205A: AbAO optical observations
  25. GRB 180205A optical observations
  26. GRB 180202A: Insight-HXMT/HE detection
  27. GRB 180204A: MITSuME Okayama optical upper limits
  28. GRB 180205A: confirmation of Swift-BAT trigger time.
  29. GRB 180205A: Optical observations
  30. GRB 180205A: Swift/UVOT Detection
  31. GRB 180205A: Nanshan-1m optical observations
  32. GRB 180205A: Swift-XRT refined Analysis
  33. GRB 180205A: Swift-BAT refined analysis
  34. GRB 180205A: Xinglong TNT optical observation
  35. GRB 180205A: Further GROND Observations reveal Afterglow is still bright
  36. GRB 180205A: Nickel telescope optical observations
  37. GRB 180205A: VLT polarimetry
  38. GRB 180205A: Mondy optical observations
  39. GRB 180205A: Fermi GBM observation
  40. Konus-Wind observation of GRB 180204A
  41. GRB 180205A: VLT/X-shooter redshift
  42. GRB 180205A: GROND detection of the NIR/optical afterglow
  43. GRB 180205A: KAIT optical afterglow confirmation
  44. GRB 180205A: Swift detection of a burst with a bright optical counterpart
  45. GRB 180204A: Swift-BAT refined analysis
  46. GRB 180204A: Swift/UVOT Upper Limits
  47. GRB 180204A: Fermi GBM detection
  48. GRB 180204A: Enhanced Swift-XRT position
  49. GRB 180204A: Swift-XRT refined Analysis
  50. GRB 180204A: Swift detection of a short burst
  51. GRB 180126A CALET Gamma-Ray Burst Monitor detection
  52. GRB 180120A: AstroSat CZTI detection
  53. Fermi GBM trigger 538030981/180119210 is not a GRB
  54. GRB 180120A: Fermi GBM Detection
  55. GRB 180120A CALET Gamma-Ray Burst Monitor detection
  56. Fermi GBM trigger 538316685/180122517 is not a GRB
  57. GRB 180113B: AstroSat CZTI detection
  58. GRB 180113A: AstroSat CZTI detection
  59. GRB 180115A: SEDM Observations
  60. GRB 180116A CALET Gamma-Ray Burst Monitor detection
  61. Konus-Wind observation of GRB 171209A
  62. GRB 180113A CALET Gamma-Ray Burst Monitor detection
  63. GRB 180112A CALET Gamma-Ray Burst Monitor detection
  64. GRB 180115A: Swift/UVOT Detection
  65. GRB 180116A: Fermi GBM Detection
  66. Konus-Wind observation of GRB 180113B
  67. IPN Triangulation of GRB 180113B
  68. GRB 180112A: Insight-HXMT/HE detection/observation
  69. GRB 180111A AROMA-N optical observation
  70. Konus-Wind observation of GRB 180113C
  71. e-MERLIN detection of GRB 171205A
  72. IPN Triangulation of GRB 180113C
  73. GRB 180115A: Swift-BAT refined analysis
  74. GRB 180116A: MAXI/GSC detection
  75. GRB 180115A: Redshift from OSIRIS/GTC
  76. GRB 180115A: NOT detection of optical counterpart
  77. Konus-Wind observation of GRB 180113A
  78. GRB 180113C: Insight-HXMT/HE observation
  79. GRB 180113B: Insight-HXMT/HE observation
  80. GRB 180111A: Insight-HXMT/HE observation
  81. GRB 180115A: MITSuME Akeno optical upper limits
  82. GRB 180113A: Swift ToO observations
  83. GRB 180115A: Swift-XRT refined Analysis
  84. GRB 180115A: Enhanced Swift-XRT position
  85. Konus-Wind observation of GRB 180111A
  86. GRB 180115A: Swift detection of a burst with an optical counterpart.
  87. GRB 180113C: Fermi GBM detection
  88. GRB 180111A CALET Gamma-Ray Burst Monitor detection
  89. GRB 180113A: Swift-BAT refined analysis
  90. GRB 180111A: AbAO optical observations
  91. GRB 180113A: KAIT Optical Observations
  92. GRB 180113B: Fermi GBM detection
  93. GRB 180113A: Fermi GBM observation
  94. GRB 180111A: Swift/UVOT Detection
  95. GRB 180103A: Swift-XRT afterglow detection
  96. GRB 180113A: Swift detection of a burst
  97. GRB 180111A: Swift-BAT refined analysis
  98. GRB 180111A: RATIR Optical and NIR Observations
  99. GRB 180111A: Swift-XRT refined Analysis
  100. GRB 180111A: AGILE/MCAL detection

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