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"

32686 results found.

  1. GRB 091024: Super-LOTIS early observations
  2. GRB091024: VRcIc Afterglow Observations
  3. GRB 091024: Swift-BAT refined analysis
  4. Swift-BAT Triggers 373679-373684 are not real
  5. GRB 091024: Fermi GBM Observations
  6. GRB 091024: Swift-XRT team refined analysis
  7. GRB 091024: Xinglong TNT optical observation
  8. GRB 091024 : Faulkes Telescope North - Afterglow Confirmation
  9. GRB 091024 Gemini-North redshift
  10. GRB 091024: GRAS004 optical observations
  11. GRB 091024: Faulkes Telescope North Afterglow Candidate
  12. GRB 091018: Skynet/PROMPT Continued Observations of Fading
  13. GRB 091020: Additional Lick observations
  14. Konus-Wind observations of GRB 091020 (correction to GCN 10057)
  15. GRB 091020: Lick observations
  16. Konus-Wind observations of GRB 091010
  17. GRB 091020: Swift-XRT refined analysis
  18. GRB 091018: Swift XRT refined analysis
  19. GRB091020 Swift/UVOT observations
  20. GRB 091020: NOT spectroscopic redshift
  21. GRB 091020: MASTER optical transient polarimetry
  22. GRB 091020, Swift-BAT refined analysis
  23. GRB 090926A: Late-time Gemini South Observations and Possible Jet Break
  24. GRB 091018: miniTAO/ANIR Observations
  25. GRB 091018: Skynet/PROMPT Observations of Fading
  26. Konus-RF observation of GRB 091018
  27. GRB 091018 : Faulkes Telescope South Observations
  28. GRB 091018: BOOTES-3 observations
  29. GRB 091018: VLT/X-shooter spectra
  30. GRB091018: Swift/UVOT observations
  31. GRB 091018: Swift-BAT refined analysis
  32. GRB 091018: GROND observations
  33. GRB091018: Magellan Echellette Observations
  34. GRB 091018: ROTSE-III Detection of Optical Counterpart
  35. GRB 091015: Skynet/PROMPT Observations
  36. GRB 091003: Gemini-N redshift of possible host galaxy
  37. GRB 091010: optical obsevation
  38. GRB 091015: RTT150 optical observations
  39. GRB 090726 R band observations
  40. GRB 091010: optical afterglow candidate rejection
  41. GRB 091015: correction to GCN 10025
  42. GRB 091010: Swift-XRT refined analysis
  43. GRB 091010: Suzaku WAM observation of the prompt emission
  44. GRB 091010: AGILE-MCAL measurement and GRID upper limit
  45. Radio observation of GRB090927 with ATCA
  46. Radio observation of GRB090926a with ATCA
  47. Radio observation of GRB080916c with ATCA
  48. GRB 091010: Fermi GBM observation
  49. GRB 091010: Faulkes Telescope North observations
  50. GRB 090531A: Skynet/PROMPT Observations
  51. GRB 090530A: Skynet/DSO Detections
  52. GRB 091010: RXTE detection
  53. Konus-Wind observations of GRB 091010
  54. GRB 091010: Enhanced XRT position
  55. GRB 091010 optical upper limits
  56. Detection of a short GRB 090929A by RT-2 Experiment
  57. RT-2 observation of the bright GRB 090926A
  58. GRB 091010: GROND afterglow candidate
  59. GRB 091010: Swift/UVOT Upper Limits
  60. GRB 091010: Swift-XRT position
  61. SuperAGILE GRB is 091010 and not 090910
  62. GRB 090926A: Skynet/PROMPT Observations of Day 6 - 11 Fading
  63. GRB 090518: Skynet/PROMPT Observations
  64. Short-Duration GRB 090621: Skynet/Dolomiti Observations
  65. GRB 090904A: afterglow confirmation
  66. GRB 090812: Skynet/PROMPT and GORT Observations
  67. GRB 091003A: Suzaku WAM observation of the prompt emission
  68. GRB 091003: Lick observations and possible SDSS host galaxy
  69. GRB 090926B: Skynet/PROMPT Observations
  70. GRB 091003: WHT ACAM observations
  71. Konus-Wind observation of GRB 091003A
  72. GRB 090929B: Suzaku WAM observation of the prompt emission
  73. GRB 091003: Swift-XRT confirmation of fading afterglow
  74. GRB 091003: Swift/UVOT Detection of an Optical Afterglow
  75. GRB 091003: Skynet/DSO Observations
  76. GRB 091003: UVOT-enhanced XRT position
  77. GRB 091003: Swift UVOT Detection of a Candidate UV Afterglow
  78. GRB 091003: Swift XRT analysis
  79. GRB 090926A: Skynet/PROMPT Observations of Day 4 - 6 Fading Rate
  80. GRB 090926A: Skynet/PROMPT Observations of Post-Peak Fading
  81. GRB 090929A: Swift/UVOT Observations
  82. GRB 090929A, Swift-BAT refined analysis
  83. GRB 090929B, Swift-BAT refined analysis
  84. GRB 090929A: Swift-XRT non-detection
  85. Konus-Wind observation of GRB 090929A
  86. Konus-Wind observation of GRB 090929B
  87. GRB 090927: Fermi GBM observation
  88. GRB 090929B: Swift-XRT refined analysis
  89. GRB 090926A: Fermi LAT and GBM refined analysis
  90. GRB 090929B: Gemini-N upper limits
  91. GRB 090929B: Skynet/DSO Observations
  92. GRB 090929B: Swift/UVOT Observations
  93. Konus-RF observation of GRB 090929A
  94. GRB 090929B: RAPTOR Discovery of Optical Counterpart
  95. GRB 090929A BAT location of the Fermi GBM burst
  96. Correction: GRB 090929B: Enhanced Swift-XRT position
  97. GRB090926A: Swift-XRT refined analysis
  98. GRB 090927: Faulkes Telescope South Detection of the Optical Afterglow
  99. Konus-Wind and Konus-RF observations of GRB 090926A
  100. GRB 090927: VLT redshift

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