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"

19602 results found.

  1. GRB 110503A optical observation
  2. GRB 110428A: Fermi-GBM observation
  3. GRB 110503A: TAROT Calern observatory optical observations
  4. GRB 110503A optical observations
  5. Konus-Wind observation of GRB 110503A
  6. GRB 110503A: Centimeter observation from EVLA
  7. GRB 110503A: Swift/UVOT Observations
  8. GRB 110503A: Swift-XRT refined Analysis
  9. GRB 110503A: PAIRITEL NIR Detection
  10. GRB 110503A: Swift-BAT refined analysis
  11. GRB 110503A: Enhanced Swift-XRT position
  12. GRB 110503A: Swift detection of a burst with a bright optical counterpart
  13. GRB 110426A: Swift/XRT non-detection
  14. GRB 110428A : X-ray afterglow confirmation
  15. GRB 110428A: Suzaku WAM observation of the prompt emission
  16. GRB 110422A: optical observations in CrAO
  17. GRB 110428A : Swift-XRT observations
  18. GRB 110422A: optical observations in CrAO, second epoch
  19. GRB 110422A: Suzaku WAM observation of the prompt emission
  20. GRB 110422A: optical observations in CrAO
  21. Konus-Wind observation of GRB 110422A
  22. GRB 110422A: Swift/UVOT Detection of optical afterglow
  23. GRB 110422A: Swift-XRT refined Analysis
  24. GRB 110422A: Enhanced Swift-XRT position
  25. GRB 110422A: MASTER earlier OT polarization observations
  26. GRB 110422A: Swift-BAT refined analysis
  27. GRB 110422A: Swift detection of a burst
  28. GRB 110328A/Swift J164449.3+573451: Maidanak Optical Observation
  29. GRB 110420B: Swift/UVOT Upper Limits
  30. GRB110420A: GROND detection of the Optical/NIR Afterglow Candidate
  31. GRB 110420B: Swift-XRT afterglow candidate retraction
  32. GRB 110420B: Fermi GBM observation
  33. Konus-Wind observation of GRB 110420A
  34. GRB 110420B: Spectral lag indicates short hard burst
  35. GRB 110420B, GROND observations
  36. GRB 110420A Swift/UVOT Observations
  37. GRB 110420B: Swift-XRT afterglow candidate
  38. GRB 110420B: Swift-BAT refined analysis
  39. GRB 110420A: Swift-BAT refined analysis
  40. GRB 110420B: Swift detection of a short hard burst
  41. GRB 110420A: Swift-XRT refined Analysis
  42. GRB 110420A: Enhanced Swift-XRT position
  43. GRB 110420A: Swift detection of a burst with optical counterpart
  44. GRB 110414A: GROND upper limits
  45. GRB 110414A: Swift-BAT Refined Analysis
  46. GRB 110414A: Swift/UVOT Upper limits
  47. GRB 110414A: Swift-XRT refined Analysis
  48. GRB 110414A: Enhanced Swift-XRT position
  49. GRB 110328A / Swift J164449.3+573451: WISE quiescent source upper limit
  50. GRB 110414A : Faulkes Telescope North observations
  51. GRB 110414A: Swift detection of a burst
  52. GRB 110411A: PAIRITEL NIR Upper Limits
  53. GRB 110412A: Swift-BAT refined analysis
  54. GRB 110411A: Swift-XRT refined Analysis
  55. GRB 110412A: Fermi GBM observation
  56. GRB 110411A: Swift/UVOT Upper Limits
  57. GRB 110412A: Swift detection of a burst
  58. GRB 110411A, Swift-BAT refined analysis
  59. GRB 110411A: Enhanced Swift-XRT position
  60. GRB 110411A: MASTER optical observations
  61. GRB 110411A: Swift detection of a burst
  62. GRB 110328A / Swift J164449.3+573451: R-band Monitoring
  63. GRB 110407A: Swift-XRT refined Analysis
  64. GRB 110328A / Swift J164449.3+573451: MASTER pre, prompt and follow-up observations
  65. GRB 110328A / Swift J164449.3+573451: optical observations
  66. GRB 110328A / Swift J164449.3+573451: VLBA Observations
  67. GRB 110328A/Swift J164449.3+573451 UVOT Upper Limits
  68. GRB 110407A: MASTER optical observations
  69. GRB110407A: UVOT Upper Limits
  70. GRB 110407A: GROND Detection of the Optical Afterglow
  71. GRB 110407A: Enhanced Swift-XRT position
  72. GRB 110407A: Swift-BAT refined analysis
  73. IPN triangulation of the bright GRB110406A
  74. GRB 110407A: MASTER early optical observations
  75. GRB 110407A: Prompt enhanced Swift-XRT position
  76. GRB 110407A: Swift detection of a burst
  77. GRB 110328A/Swift J164449.3+573451: BAT recent rate increase and pre-outburst,light curve
  78. GRB 110402A: Suzaku WAM observation of the prompt emission
  79. GRB 110328/Swift J164449.3+573451: Chandra observations
  80. GRB 110328A / Swift J164449.3+573451: Keck LRIS R-band photometry
  81. GRB 110328A / Swift J164449.3+573451, HST Observations
  82. GRB 110328A / Swift J164449.3+573451: millimeter detection at PdBI
  83. GRB 110402A: Konus-Wind spectral lags and detailed energetics
  84. GRB 110402A: Fermi GBM detection
  85. GRB 110402A afterglow observation
  86. GRB 110328A / Swift J164449.3+573451: Keck/DEIMOS Optical Spectroscopy
  87. GRB 110328A/Swift J164449.3+573451: SARA-N detection
  88. GRB 110402A: Swift/UVOT detection of afterglow candidate
  89. GRB 110402A: Spectral lag indicates short hard burst
  90. Konus-Wind observation of GRB 110402A
  91. GRB 110402A: Konkoly observations
  92. GRB 110328A: Konkoly observations.
  93. GRB 110402A: Swift-BAT refined analysis
  94. GRB 110402A: Swift-XRT refined Analysis
  95. GRB 110402A: early optical limit by "Pi of the Sky"
  96. GRB110328A/Swift J164449.3+573451: Fermi LAT Observations
  97. GRB 110402A: PAIRITEL NIR Upper Limits
  98. GRB 110402A: Enhanced Swift-XRT position
  99. GRB 110402A: Liverpool Telescope Observations
  100. GRB 110402A: Swift detection of a burst

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