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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"

20872 results found.

  1. GRB 130828A: Swift XRT and UVOT observations
  2. GRB 130829A: NOT optical observations
  3. GRB 130828A Tiled Swift observations
  4. GRB 130822A: 5.8 GHz VLA upper limit
  5. GRB 130822A: Gemini Observations
  6. GRB 130822A: WHT ACAM observations
  7. GRB 130822A: Swift/UVOT Upper Limits
  8. GRB 130822A: Weihai optical upper limit
  9. GRB 130816A: Swift/UVOT Upper Limits
  10. GRB 130816B: Swift/UVOT Upper Limits
  11. GRB 130816B: GROND afterglow candidate
  12. GRB 130816A: GROND confirmation of afterglow
  13. GRB 130816A: REM NIR candidate afterglow
  14. GRB 130812A: Swift/UVOT Upper Limits
  15. GRB 130812A: GROND upper limits
  16. Correction to GCN Circ. 15086 "GRB130807A: Swift/UVOT observations"
  17. GRB130807A: Swift/UVOT observations
  18. GRB 130806A: Swift/UVOT Upper Limits
  19. GRB 130623A: GROND detection of the optical/NIR afterglow
  20. GRB130803A: GROND observations
  21. GRB 130803A: RATIR Optical and NIR Observations
  22. GRB130803A: GROND detection of possible host
  23. GRB 130803A: Swift/UVOT Upper Limits
  24. GRB 130803A: Faulkes Telescope South Observations
  25. GRB 130603B: Second epoch of HST WFC/F160W imaging
  26. GRB 130722A: RATIR Optical Observations
  27. GRB 130727A: Swift/UVOT Detection
  28. GRB 130727A: GROND observations
  29. GRB 130727A: Swift-XRT observations
  30. GRB 130727A: Swift-XRT and Swift-UVOT prompt observations
  31. GRB 130725B: Swift/UVOT Observations
  32. GRB130725B: REM-ROS2 optical observations
  33. GRB 130725A: Swift/UVOT Upper Limits
  34. GRB 130725A - Faulkes Telescope South Observations
  35. GRB 130725B: GROND Detection of the Optical/NIR Afterglow
  36. GRB 130725B: Swift/UVOT Detection of an Optical Counterpart
  37. GRB 130719A: Skynet/PROMPT observations
  38. Retraction of GCN Circ. 15020 (GRB 130722C Tiled Swift observations)
  39. GRB 130722A: Swift/UVOT Detection
  40. GRB 130722C Tiled Swift observations
  41. GRB 130722A: Skynet/GORT observations
  42. GRB 130716A: Gemini-North imaging
  43. GRB 130716A: UVOT Upper Limits
  44. GRB 130626A: Retraction of possible X-ray afterglow
  45. GRB 130702A: Maidanak optical observations
  46. GMRT radio detection of GRB 130702A
  47. GRB 130708A: Swift XRT and UVOT Observations
  48. GRB 130702A: TNG spectroscopic observations of the emerging supernova
  49. GRB 130702A: P200 Spectroscopic Confirmation of Associated Supernova
  50. GRB 130702A: Maidanak optical observations
  51. GRB130702A: NOT observation - the detection of an emerging supernova
  52. GRB 130702A: Continued RATIR Optical and NIR Observations
  53. GRB 130702A: Continued UVOT Observations
  54. GRB 130702A (= Fermi 394416326): correction of the GCN #14988 title
  55. GRB 130702Ð
  56. GRB 130702A: WSRT radio detection
  57. GRB130702A: Redshift of Afterglow Candidate iPTF13bxl
  58. GRB 130702A: further TNG observations
  59. GRB 130702A: NOT spectroscopy and redshift of the nearby bright galaxy
  60. GRB 130702A: further Swift-XRT observations
  61. GRB 130702A: Continued P60 observations
  62. GRB 130702A: RATIR Optical and NIR Observations
  63. GRB 130702A: NOT optical observations
  64. GRB 130702A: TNG optical observations
  65. GRB 130702A / Fermi394416326 : Nanshan optical observations
  66. Fermi GRB 130702A: Swift XRT and UVOT observations
  67. Fermi394416326: FTN detection
  68. Fermi394416326: iPTF detection of a possible optical afterglow
  69. GRB 130701A: P60 Observations
  70. GRB 130701A: Swift/UVOT Detection
  71. GRB 130701A: VLT/X-shooter redshift
  72. GRB 130701A: optical afterglow from the NOT
  73. GRB 130627B: Swift/UVOT Upper Limits
  74. GRB 130627A: Swift/UVOT Upper Limits
  75. GRB 130626A: KAIT Optical Observations
  76. GRB 130626A: RATIR Optical Observations
  77. GRB130627B: Swift/UVOT Observations
  78. GRB 130627B: Swift-XRT observations
  79. GRB 130626A: Swift-XRT possible detection and UVOT upper limits
  80. GRB 130627A: Swift-XRT observations
  81. GRB 130625A: Swift/UVOT Upper Limits
  82. GRB 130623A: Swift-XRT and UVOT observations
  83. GRB 130603B: First epoch of XMM-Newton observations
  84. Swift Trigger 558631: AAO optical observations
  85. GRB 130612A: Continued Skynet/PROMPT/GORT/DSO observations
  86. GRB 130603B: Analogy with GRB 090510A and possible connection with a supernova
  87. GRB 130615A: Continued Skynet/PROMPT Observations
  88. GRB 130610A: TAROT La Silla observatory optical observations
  89. GRB 130610A: CrAO optical observations
  90. GRB 130615A: Zadko observatory - Gingin optical observations
  91. GRB 130615A: TAROT La Silla observatory optical observations
  92. GRB 130615A: Swift/UVOT Upper Limits
  93. GRB 130615A: Skynet/PROMPT Observations
  94. GRB 130615A: GROND afterglow candidate
  95. GRB 130603B: Detection of possible afterglow/kilonova in HST observations
  96. GRB 130612A: iTelescope T21 optical observations
  97. GRB 130603B: HST limits on an underlying supernova
  98. GRB 130610A: iTelescope T21 optical observations
  99. GRB 130612A: ISON-NM optical observations
  100. GRB 130609B: Theoretical redshift estimation

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