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"

23610 results found.

  1. GRB 100216A Short, hard GRB detected in ground analysis of Swift-BAT data
  2. GRB 100213A: Swift-BAT refined analysis
  3. GRB 100213B: Gemini-N Observations
  4. GRB 100213B: Swift-BAT refined analysis
  5. GRB 100213B: Swift detection of a burst
  6. GRB 100213A: Swift detection of a burst
  7. GRB 100206A: Second epoch Gemini-north observations and afterglow limits
  8. Swift/UVOT observations of GRB120212A
  9. GRB 100212A: LOAO R-band Detection/V-band Observation
  10. GRB 100212A: Swift-BAT refined analysis
  11. GRB 100212A: Swift detection of a burst
  12. GRB 091127: Detection of a Supernova
  13. GRB 100205A: Keck limits on an underlying host galaxy
  14. GRB 100205A: BOAO/LOAO zYJK observation
  15. GRB 100205B: Fermi GBM detection
  16. GRB 100206A: GROND upper limits
  17. GRB 100206A: Gemini-North observations
  18. GRB 100131A: MASTER-Net optical alert observations
  19. GRB 100206A: YNAO-GMG observations
  20. GRB 100206A: MASTER-Net optical alert observations
  21. GRB 100206A: PAIRITEL Photometry of Host Candidate
  22. GRB 100206A - Keck/LRIS Spectroscopy
  23. GRB100206: MITSuME optical upper limits
  24. GRB 100206A: WHT candidate afterglow
  25. GRB 100206A: optical observations from Southern Spain
  26. GRB 100205A: GROND upper limits
  27. GRB 100206A: Optical limit
  28. GRB 100206A: Swift-BAT refined analysis
  29. GRB 100206A: Swift detection of a short hard burst
  30. GRB100205A: CFHT z'-band observation
  31. GRB 100130B: Fermi GBM detection
  32. GRB 100113A: Fermi GBM detection
  33. GRB 100205A: Swift-BAT refined analysis
  34. GRB 100205A: Swift XRT refined analysis
  35. GRB 100203A: Swift XRT and UVOT refined analyses
  36. GRB 100205A: Gemini-South Observations
  37. GRB 100131A: Suzaku WAM observation of the prompt emission
  38. GRB 100205A: Swift detection of a burst
  39. GRB 100203A Detected in Ground Analysis of BAT Data
  40. Short X-ray Transient detected by MAXI/GSC
  41. GRB 100119A: Suzaku WAM observation of the prompt emission
  42. Konus-Wind observation of GRB 100119A
  43. GRB 100122A: MASTER-Net optical observations
  44. GRB 100116A: Suzaku WAM observation of the prompt emission
  45. GRB 100119A: Swift-BAT refined analysis
  46. GRB 100119A: Swift detection of a burst
  47. Konus-Wind observation of GRB 100116A
  48. GRB 100117A: Gemini North spectroscopy
  49. Swift/UVOT refined analysis of GRB100117A
  50. GRB 100117A: Optical object inside the revised XRT error circle
  51. GRB 100117A: Swift-XRT refined analysis
  52. GRB 100117A: Gemini-North upper limit
  53. GRB 100117A: Magellan IMACS imaging
  54. GRB 100117A: Swift-BAT refined analysis
  55. GRB 100117A: Swift detection of a short hard burst
  56. GRB 100116A: Fermi GBM detection
  57. GRB 100115A: Swift-XRT candidate afterglow
  58. GRB 100115A detected in ground analysis of Swift-BAT data
  59. GRB 100111A: Swift-BAT refined analysis
  60. GRB 100111A: Swift detection of a burst with an optical afterglow
  61. Swift/BAT Detects an Outburst from XTE J1901+014
  62. GRB 100103A: GROND Upper Limits
  63. Konus-Wind observation of GRB 100103A
  64. GRB 100103A: Swift/UVOT Upper Limits
  65. GRB 100103A: Correction to Swift position error
  66. GRB 100103A: Swift/XRT position
  67. GRB 100103A: a long GRB detected with INTEGRAL
  68. Swift Trigger 381591: Retraction of Reported UVOT Source
  69. Swift Trigger 381591 is probably not a burst
  70. Swift Trigger 381591: Uncatalogued UVOT Source
  71. GRB 091230: Swift/UVOT Observations
  72. Trigger 381591: Swift detection of a possible burst
  73. GRB 091230: a long GRB detected by INTEGRAL
  74. Trigger 381434: Swift detection of a possible burst
  75. GRB 091221 : IRSF NIR upper limit
  76. GRB 091221: Skynet/PROMPT Detections
  77. GRB 091117: Swift-XRT late time observations
  78. GRB 091221 Swift-BAT refined analysis
  79. GRB091221: Swift/UVOT refined analysis, correction.
  80. GRB 091221: Swift/UVOT refined analysis
  81. GRB 091221: UVOT Confirmation of an Optical Afterglow
  82. GRB 091221: Swift detection of a burst
  83. Swift trigger 379449 (possible GRB) is not a burst
  84. GRB 091215: Faulkes Telescope North observations
  85. Trigger 379449: Swift detection of a possible burst
  86. GRB 091208A: Suzaku WAM observation of the prompt emission
  87. Konus-Wind observation of GRB 091208A
  88. GRB091208A: Swift/UVOT refined analysis
  89. GRB 091208B: Keck HIRES redshift confirmation
  90. GRB 091208B: GROND observations
  91. GRB091208B: Swift/UVOT refined analysis
  92. GRB 091208B, Swift-BAT refined analysis
  93. GRB 091208A Swift-BAT refined analysis
  94. GRB 091208B: Faulkes Telescope North and South Optical Afterglow
  95. GRB 091208B: MITSuME Okayama Optical Observation
  96. GRB 091208B: Swift detection of a burst with an optical afterglow
  97. GRB 091208B: BOOTES-3 optical afterglow
  98. GRB 091208: Swift detection of a burst
  99. Short X-ray Transient, RIMOTS optical upper limits
  100. A small revision to the GRB-naming convention

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