Skip to main content
New! Browse Circulars by Event, Advanced Search, Sample Codes, Schema Release. 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"

3850 results found.

  1. Konus-Wind observation of GRB 150523A
  2. GRB 150523A: Fermi-LAT detection
  3. GRB 150523A: Fermi GBM detection
  4. GRB 150424A: 9.8 GHz VLA detection
  5. Konus-Wind observation of GRB 150428A
  6. GRB 150430A: MAXI/GSC detection
  7. GRB 150413A: CrAO optical observations
  8. Trigger 639199: Swift detection of IGRJ16418-4532
  9. GRB 150423A: Swift detection of a short burst
  10. Konus-Wind observation of GRB 150418A
  11. GRB 150418A: MAXI/GSC detection
  12. GRB 150413A: GMG observation
  13. Konus-Wind observation of a bright burst from SGR 1935+2154
  14. GRB 150413A: T7 and T18 optical observations
  15. IPN Triangulation of a bright burst from SGR 1935+2154
  16. GRB 150323C: additional optical observations in Mondy
  17. GRB 150313A: MAXI/GSC detection
  18. Chandra X-ray observations of SWIFT J0045.2+4151 (aka Sw J0045 aka GRB 150301C aka p[PFH2005] 622)
  19. GRB 150301A: Swift-BAT refined analysis
  20. GRB 150301B: Swift detection of a burst with an optical afterglow
  21. GRB 150301A: Fermi GBM observation
  22. GRB 150301A: Swift detection of a short burst or new SGR
  23. Fermi GBM Observations of SGR 1935+2154
  24. Fermi GBM trigger 150223068 is not a GRB
  25. SGR 1935+2154: Swift-BAT refined analysis
  26. Swift detection of an outburst from SGR 1935+2154
  27. GRB 150213B, the review of the sky area in plate archives
  28. Fermi GBM trigger 150220229 is not a GRB
  29. GRB 150212A: Skynet DSO14/GORT observations
  30. GRB 150203A iTelescope observation
  31. GRB 150201A: Swift detection of a burst
  32. GRB 150128A: MASTER OT detction during inspection
  33. IPN Triangulation of GRB 150127B
  34. GRB 150123A: MAXI/GSC detection
  35. GRB 150120B: Swift detection of a burst
  36. GRB 150101A: Swift detection of a short burst
  37. GRB 141229A: Deep MASTER inspection
  38. GRB 141229A: Nanshan optical upper limit
  39. Fermi GBM trigger 141229739 is not a GRB
  40. GRB 141229A: MAXI/GSC detection
  41. GRB 141225A: Fermi GBM detection
  42. Konus-Wind observation of GRB 141222A
  43. GRB 141220A: MITSuME Akeno upper limits
  44. GRB 141212A: MITSuME Akeno upper limits
  45. GRB 141121A: Mondy optical observations
  46. GRB 141121A: Mondy optical observations
  47. IPN Triangulation of GRB 141125A (short/hard)
  48. GRB 141121A: MITSuME Ishigakijima Optical Observation
  49. IPN Triangulation of GRB 141118A
  50. GRB 141028A: TShAO optical observation
  51. GRB 141022A: Skynet PROMPT-CTIO Observations
  52. GRB 141029A: Nanshan optical upper limit
  53. GRB 141028A: SAO RAS Zeiss-1000 photometry
  54. GRB 141028A: VLT/X-shooter redshift of z=2.33
  55. GRB141028A: Gemini-North redshift
  56. GRB 141022A: Swift detection of a burst
  57. GRB 141015A: MITSuME Akeno upper limits
  58. GRB 140930B: MASTER early possible OT detection
  59. GRB 140928A: MAXI-GSC detection
  60. Konus-Wind observation of GRB 140928A
  61. IPN Triangulation of GRB 140928A
  62. GRB 140928A: LCO-Cerro Tololo observations
  63. GRB 140928A: Fermi GBM detection
  64. GRB 140928A: GROND Afterglow Candidate
  65. GRB 140928A: Fermi-LAT detection
  66. GRB 140919A: GROND afterglow candidate
  67. GRB 140909A: Swift detection of a GRB
  68. GRB 140907A: MITSuME Akeno Optical Observation
  69. GRB 140907A: redshift from the 10.4m GTC telescope
  70. GRB 140829A: Fermi GBM Detection
  71. GRB 140829A: iPTF optical observations
  72. GRB 140828A: Swift detection of a burst
  73. GRB 140821A: Fermi GBM Detection
  74. GRB 140817A: Swift/UVOT Afterglow Detection
  75. Konus-Wind observation of GRB 140817A
  76. GRB 140817A: Swift-XRT position
  77. GRB 140815A: Swift-XRT observations
  78. GRB 140808A: Redshift from the 10.4m GTC telescope
  79. GRB 140729A: iPTF optical upper limit
  80. GRB 140729A: Swift-XRT and UVOT observations
  81. GRB 140729A: Fermi-GBM detection
  82. Trigger 607399: Swift detection of SGR1806-20
  83. Konus-Wind observation of GRB 140721A
  84. GRB 140716A found in ground analysis of Swift-BAT data
  85. GRB 140713A: Swift detection of a burst
  86. Fermi GBM Observations of SGR 1935+2154
  87. GRB 140710A: Swift-BAT refined analysis
  88. GRB 140710A: Enhanced Swift-XRT position
  89. GRB 140710A: correction to GCN #16565
  90. GRB 140710A: GROND Detection of NIR Afterglow Candidate
  91. GRB 140710A: Swift detection of a burst
  92. GRB 140705A / SGR 1935+2154: VLA 6 GHz observations
  93. Pre-discovery observations of SGR 1935+2154 in Swift archival data
  94. GRB 140705A / SGR 1935+2154: Probable association with supernova remnant G57.2+0.8
  95. SGR 1935+2154: Swift-BAT observations of additional short soft events
  96. GRB 140705A / SGR 1935+2154: FTN observations
  97. GRB 140705A / SGR 1935+2154: Optical observations from 10.4m GTC
  98. GRB 140705A: Swift-BAT refined analysis of a possible newly discovered SGR 1935+2154
  99. GRB 140621A: Suzaku WAM observation of the prompt emission
  100. GRB 140629A, Optical observations

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