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"

27408 results found.

  1. GRB 130816B, Swift-BAT refined analysis
  2. GRB 130816B: GROND afterglow candidate
  3. GRB 130816A: Swift-XRT refined Analysis
  4. GRB 130816A, Swift-BAT refined analysis
  5. GRB 130816A: Fermi GBM observation
  6. GRB 130816B: Swift-XRT refined Analysis
  7. GRB 130816A: GROND confirmation of afterglow
  8. GRB 130816B: Swift detection of a burst
  9. GRB 130816A: Swift detection of a burst
  10. Refined IPN Triangulation of GRB 130812B
  11. IPN Triangulation of GRB 130812B (long/soft)
  12. GRB 130812A: Swift/UVOT Upper Limits
  13. GRB 130812A, Swift-BAT refined analysis
  14. GRB 130812A: GROND upper limits
  15. GRB 130812A: Swift-XRT refined Analysis
  16. GRB 130812A: Swift detection of a burst
  17. GRB130807A: Swift/UVOT observations
  18. GRB 130807A: Swift-XRT refined analysis
  19. GRB 130806A: Swift/UVOT Upper Limits
  20. GRB 130807A, Swift-BAT refined analysis
  21. GRB 130807A: Swift detection of a GRB or Galactic transient
  22. GRB 130623A: GROND detection of the optical/NIR afterglow
  23. GRB 130806A: Swift-XRT refined Analysis
  24. GRB 130806A, Swift-BAT refined analysis
  25. IPN localization of GRB 130804A
  26. SGR 1745-29 (Swift trigger 565443), Swift-BAT refined analysis
  27. GRB130803A: GROND observations
  28. GRB 130806A: Swift detection of a burst
  29. GRB 130804A; Fermi GBM observation
  30. Trigger 565443: Swift detection of a burst from SGR J1745-29
  31. GRB 130803A: Swift-XRT refined Analysis
  32. GRB 130803A: RATIR Optical and NIR Observations
  33. GRB130803A: GROND detection of possible host
  34. GRB 130803A: Swift/UVOT Upper Limits
  35. GRB 130803A; Fermi GBM observation
  36. GRB 130803A, Swift-BAT refined analysis
  37. GRB 130803A: Faulkes Telescope South Observations
  38. GRB 130803A: Swift detection of a burst
  39. GRB 130727A: Watcher optical limit
  40. GRB 130722A: RATIR Optical Observations
  41. GRB 130727A: Swift/UVOT Detection
  42. Konus-Wind observation of GRB 130727A
  43. GRB 130727A: Swift-XRT refined Analysis
  44. GRB 130727A: Fermi GBM detection
  45. GRB 130727A: GROND observations
  46. GRB 130727A: Faulkes Telescope South optical afterglow
  47. GRB 130727A: Swift-BAT refined analysis
  48. GRB 130727A: Swift-XRT observations
  49. GRB 130727A: Swift-XRT and Swift-UVOT prompt observations
  50. GRB 130727A: Swift detection of a burst
  51. GRB 130725B: Swift/UVOT Observations
  52. GRB 130725B: Swift trigger time correction
  53. Fermi Gamma-ray Burst Monitor trigger 396484884 / 130725945 is not a GRB
  54. GRB 130725A: Swift-XRT refined Analysis
  55. GRB 130725B, Swift-BAT refined analysis
  56. GRB 130725B: Swift-XRT refined Analysis
  57. Fermi Gamma-ray Burst Monitor trigger 396533554 / 130726509 is not a GRB
  58. GRB 130725A: Swift/UVOT Upper Limits
  59. GRB 130725A - Faulkes Telescope South Observations
  60. GRB 130725B: GROND Detection of the Optical/NIR Afterglow
  61. GRB 130725B: Swift/UVOT Detection of an Optical Counterpart
  62. GRB 130725A, Swift-BAT refined analysis
  63. GRB 130719A: Skynet/PROMPT observations
  64. GRB 130725B: Swift detection of a burst
  65. Swift Trigger 563980 is GRB 130725A
  66. Fermi Gamma-ray Burst Monitor trigger 396447899 / 130725517 is not a GRB
  67. Swift Trigger 563980 cannot be identified at this time.
  68. Konus-Wind observation of GRB 130722A
  69. GRB 130722A: Swift/UVOT Detection
  70. GRB 130722A: Swift-XRT refined Analysis
  71. GRB 130722A: Skynet/GORT observations
  72. GRB 130719A, Swift-BAT refined analysis
  73. GRB 130722A: Faulkes Telescope South optical candidate
  74. GRB 130722A: Swift detection of a burst
  75. GRB 130719A: Swift detection of a burst
  76. GRB 130716A: Fermi GBM observation
  77. GRB 130716A Swift-BAT Spectral lag analysis
  78. GRB 130716A: UVOT Upper Limits
  79. GRB 130716A: Probable short-hard burst with delayed Swift data
  80. GRB 130715A: Fermi GBM detection
  81. GRB 130626A: Retraction of possible X-ray afterglow
  82. GRB 130708A: Swift XRT and UVOT Observations
  83. GRB 130702A: TNG spectroscopic observations of the emerging supernova
  84. GRB 130708A: Fermi GBM observation
  85. GRB 130702A: P200 Spectroscopic Confirmation of Associated Supernova
  86. GRB 130708A found in ground analysis of Swift-BAT data
  87. GRB 130702A: Continued RATIR Optical and NIR Observations
  88. GRB 130702A: VLA detection
  89. GRB 130702A: further TNG observations
  90. GRB 130702A: further Swift-XRT observations
  91. GRB 130702A: Continued P60 observations
  92. GRB 130702A: RATIR Optical and NIR Observations
  93. GRB 130702A: CARMA 3mm detection
  94. GRB 130702A: NOT optical observations
  95. GRB 130702A: TNG optical observations
  96. GRB 130702A / Fermi394416326 : Nanshan optical observations
  97. Fermi GRB 130702A: Swift XRT and UVOT observations
  98. GRB 130702A / Fermi394416326: Fermi GBM detection
  99. GRB 130702A / Fermi394416326 : Fermi-LAT detection of a burst
  100. Fermi GBM trigger 394416326: MASTER early optical limit

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