Skip to main content
New! BOOM Notices and Schema v7.0.0. See news and announcements

GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

35449 results found.

  1. GRB 100219A: Swift/UVOT Detection of a Source near the XRT Position
  2. GRB 100218A : Fermi GBM detection
  3. GRB 100219A: Swift detection of a burst
  4. GRB 100216A: Keck imaging
  5. GRB 100216A Short, hard GRB detected in ground analysis of Swift-BAT data
  6. GRB 100213A: Swift-BAT lag analysis indicates probably SHB
  7. GRB 100213B: GRT Optical Observation
  8. GRB 100213A: GRT Optical Observation
  9. GRB 100213A: Swift-BAT refined analysis
  10. GRB 100213B: Enhanced Swift-XRT position
  11. GRB 100213B: Gemini-N Observations
  12. GRB 100213B: Swift/UVOT Upper Limits
  13. GRB 100213A: Swift/UVOT Upper Limits
  14. GRB 100213B: PAIRITEL NIR Upper Limits
  15. GRB 100213A: Enhanced Swift-XRT position
  16. GRB 100213B: Swift-BAT refined analysis
  17. GRB 100213B: Swift XRT refined analysis
  18. GRB 100213A: SARA observations
  19. GRB 100213A: Swift XRT refined analysis
  20. GRB 100213B: NOT optical observations
  21. GRB 100213B: Swift detection of a burst
  22. GRB 100213A: Swift detection of a burst
  23. GRB 100206A: Second epoch Gemini-north observations and afterglow limits
  24. Swift/UVOT observations of GRB120212A
  25. GRB 100212A: LOAO R-band Detection/V-band Observation
  26. GRB 100212A: Fermi GBM detection
  27. GRB 100212A: Swift XRT refined analysis
  28. GRB 100212A: Swift-BAT refined analysis
  29. GRB 100212A: Enhanced Swift-XRT position
  30. GRB 100212A: candidate optical afterglow
  31. GRB 100212A: Swift detection of a burst
  32. GRB 091127: Detection of a Supernova
  33. GRB 100205A: Keck limits on an underlying host galaxy
  34. GRB 100205A: BOAO/LOAO zYJK observation
  35. GRB 100205B: Fermi GBM detection
  36. GRB 100206A: GROND upper limits
  37. GRB 100206A: Gemini-North observations
  38. GRB 100206A: Swift/UVOT Upper Limits
  39. GRB 100131A: MASTER-Net optical alert observations
  40. GRB 100206A: YNAO-GMG observations
  41. GRB 100206A: MASTER-Net optical alert observations
  42. GRB 100206A: PAIRITEL Photometry of Host Candidate
  43. GRB 100206A - Keck/LRIS Spectroscopy
  44. GRB100206: MITSuME optical upper limits
  45. GRB 100206A: NOT NIR observations
  46. GRB 100206A: WHT candidate afterglow
  47. GRB 100206A, RIMOTS optical upper limits
  48. GRB 100206A: optical observations from Southern Spain
  49. GRB 100205A: GROND upper limits
  50. GRB 100206A: Swift-XRT refined analysis
  51. GRB 100206A: Fermi GBM observation
  52. GRB 100206A: Optical limit
  53. GRB 100206A: Swift-BAT refined analysis
  54. GRB 100206A: Enhanced Swift-XRT position
  55. GRB 100206A: Pre-explosion imaging and host candidate
  56. GRB 100206A: Swift detection of a short hard burst
  57. GRB 100205A: Gemini-N + NIRI photometry
  58. GRB 100130B: Fermi GBM detection
  59. GRB 100113A: Fermi GBM detection
  60. GRB 100205A: Swift-BAT refined analysis
  61. GRB 100205A: Swift UVOT upper limits
  62. GRB 100205A: Swift XRT refined analysis
  63. GRB 100203A: Swift XRT and UVOT refined analyses
  64. GRB 100205A: Enhanced Swift-XRT position
  65. GRB 100205A Gemini-North IR afterglow candidate
  66. GRB 100205A: Gemini-South Observations
  67. GRB 100205A: Super-LOTIS early observations
  68. GRB 100131A: Suzaku WAM observation of the prompt emission
  69. GRB 100205A: NOT optical observations
  70. GRB 100205A: Swift detection of a burst
  71. GRB 100203A Detected in Ground Analysis of BAT Data
  72. Short X-ray Transient detected by MAXI/GSC
  73. GRB 100131A: Fermi GBM detection
  74. GRB 100119A: Suzaku WAM observation of the prompt emission
  75. Konus-Wind observation of GRB 100119A
  76. GRB 100122A: Fermi GBM detection
  77. GRB 100122A: MASTER-Net optical observations
  78. GRB 100116A: Suzaku WAM observation of the prompt emission
  79. GRB 100115A: Swift-XRT refined analysis
  80. GRB 100119A: Swift-BAT refined analysis
  81. GRB091109A: VLT/FORS2 spectroscopic redshift
  82. GRB 100117A: candidate optical afterglow
  83. GRB 100119A: Swift detection of a burst
  84. Konus-Wind observation of GRB 100116A
  85. GRB 100117A: Gemini North spectroscopy
  86. GRB 100117A: Fermi GBM detection
  87. Swift/UVOT refined analysis of GRB100117A
  88. GRB 100117A: Optical object inside the revised XRT error circle
  89. GRB 100117A: Swift-XRT refined analysis
  90. GRB 100117A: Gemini-North upper limit
  91. GRB 100117A: Magellan IMACS imaging
  92. GRB 100117A: Gemini South Imaging and CFHT Pre-Explosion Images
  93. GRB 100117A: Swift-BAT refined analysis
  94. GRB 100117A: Swift detection of a short hard burst
  95. GRB 100115A: Gemini-N photometry
  96. GRB 100115A: Enhanced Swift-XRT position
  97. GRB 100116A: Fermi LAT detection
  98. GRB 100115A: SARA Astrometry
  99. GRB 100116A: Fermi GBM detection
  100. NOT observation of GRB100115A localization

Advanced

Download all Circulars as a .tar.gz archive:
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