Skip to main content
Updates to LVK & CHIME Notices, Schema v7.2.3! 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"

37500 results found.

  1. GRB 140930B: GROND observations
  2. GRB 140930A/MAXI J2259+524: MASTER optical observations
  3. GRB 140930B Swift-BAT refined analysis
  4. GRB 140930B: Swift/UVOT Upper Limits
  5. Konus-Wind observation of GRB 140930B
  6. GRB 140930B: Keck NIR imaging
  7. GRB 140930B: Swift-XRT refined Analysis
  8. GRB 140930B: Enhanced Swift-XRT position
  9. GRB 140928A: MAXI-GSC detection
  10. GRB 140930B: MMT confirmation of the optical afterglow
  11. GRB 140930B: ISON-Kislovodsk observations
  12. GRB 140930B: WHT detection of candidate afterglow
  13. GRB 140930B: 1.23m CAHA optical observations
  14. GRB 140930B: Prompt enhanced Swift-XRT position
  15. GRB 140930B: MASTER early optical observations
  16. GRB 140930B: Swift detection of a short burst
  17. GRB140928A: Gemini-South observation
  18. GRB 140930A/MAXI J2259+524: MAXI-GSC detection
  19. Konus-Wind observation of GRB 140928A
  20. GRB 140928A: LCO-Cerro Tololo further observations
  21. IPN Triangulation of GRB 140928A
  22. GRB 140928A: LCO-Cerro Tololo observations
  23. GRB 140928A: Fermi GBM detection
  24. GRB 140928A: GROND Afterglow Candidate
  25. GRB 140928A: Swift-XRT observations
  26. GRB 140928A: Fermi-LAT detection
  27. GRB 140927A: Swift-UVOT analysis
  28. GRB 140927A: Swift-BAT refined analysis
  29. GRB 140927A: Swift-XRT refined Analysis
  30. GRB 140927A: Enhanced Swift-XRT position
  31. GRB 140927A: Swift detection of a burst
  32. GRB 140919A, Swift-BAT refined analysis
  33. GRB 140919A: Swift-XRT refined Analysis
  34. GRB 140919A: Swift/UVOT Detection
  35. GRB 140919A: GROND afterglow candidate
  36. GRB 140919A: Fermi GBM observation
  37. GRB 140919A: Enhanced Swift-XRT position
  38. GRB 140919A: Swift/UVOT observations
  39. GRB 140919A: Swift-XRT observations
  40. GRB 140919A: Swift detection of a burst
  41. GRB 140916B: LOT and iPTF follow-up of optical afterglow candidates
  42. GRB 140916A: Swift/UVOT Upper Limits
  43. GRB 140916A: Swift-BAT refined analysis
  44. GRB 140916A: UKIRT J-band observations
  45. GRB 140916A: Swift-XRT refined Analysis
  46. GRB 140916A: Enhanced Swift-XRT position
  47. GRB 140916A: MITSuME Okayama upper limits
  48. GRB 140916B: iPTF Optical Observations
  49. GRB 140916A: FTS observations
  50. GRB 140916A: Prompt enhanced Swift-XRT position
  51. GRB 140916A: Swift detection of a burst
  52. GRB 140907A: Continued DCT Observations
  53. Fermi GBM trigger 140913075 is not a GRB
  54. GRB 140909A: Confirmation of the Swift-XRT afterglow
  55. Possible radio detection of GRB 140903A with the GMRT
  56. GRB 140907A: Mondy optical observations
  57. GRB 140903A: Chandra detection of the afterglow
  58. GRB 140909A: Swift/UVOT Upper Limits
  59. GRB 140909A: Swift-XRT observations
  60. GRB 140907A: 1.23m CAHA optical observations
  61. GRB 140907A: TShAO observations
  62. GRB 140909A: Swift detection of a GRB
  63. Konus-Wind observation of GRB 140906C
  64. GRB 140907A: MASTER optical observations
  65. Refined IPN Triangulation of GRB 140906C
  66. GRB 140907A: Nishi-Harima NIR Observations
  67. GRB 140907A: MITSuME Akeno Optical Observation
  68. GRB 140907A: Discovery Channel Telescope observations
  69. IPN Triangulation of GRB 140906C (short/hard)
  70. GRB 140907A: T100 observations
  71. GRB 140907A: Swift-BAT refined analysis
  72. GRB 140907A: Fermi GBM Detection
  73. GRB 140907A: redshift from the 10.4m GTC telescope
  74. GRB 140907A: Swift-XRT refined Analysis
  75. GRB 140907A: Enhanced Swift-XRT position
  76. GRB 140907A: MITSuME Ishigakijima Optical Observation
  77. GRB140907A: MITSuME Okayama Optical Observation
  78. GRB 140907A : Virtual Telescope optical observations
  79. GRB140907A: Swift UVOT detection
  80. GRB 140906B: Fermi GBM Detection of a Long GRB
  81. GRB 140907A : Optical observations from Nanshan
  82. GRB 140907A: Swift detection of a burst with an optical counterpart
  83. GRB 140906A - Fermi GBM Detection
  84. GRB 140906A: iPTF optical transient candidates
  85. GRB 140903A: Confirmation of Optical Fading from Discovery Channel Telescope
  86. GRB 140903A: Possible optical variability
  87. GRB 140903A: NOT optical and NIR observations
  88. GRB 140901B: Swift XRT observation
  89. GRB 140903A: FTN observations
  90. GRB 140818B: TShAO optical upper limit
  91. GRB 140903A: ISON-Kislovodsk observations
  92. GRB 140903A: MAXI/GSC upper limit
  93. GRB 140903A: 6 GHz VLA detection
  94. GRB 140903A: Pan STARRS images of the field
  95. GRB 140901B: Fermi GBM detection
  96. GRB 140903A: tentative spectroscopic redshift
  97. GRB 140901B found in ground analysis of BAT data
  98. GRB 140903A: Swift/UVOT Upper Limits
  99. GRB 140903A: Swift-BAT Spectral lag analysis
  100. GRB 140903A: P60 Optical Observations

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