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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"

20901 results found.

  1. GRB 130907A: Skynet DSO-14/Yerkes-41/GORT confirmation of a fading afterglow
  2. GRB 130907A: RATIR Optical and NIR Afterglow Confirmation
  3. GRB 130907A: Skynet DSO-14/Yerkes-41 detections of a possible afterglow
  4. GRB 130831A: Maidanak optical observations
  5. GRB 130831A: ISON-Kislovodsk optical observations
  6. GRB 130831A: ISON-UAFO optical observations
  7. GRB 130907A: MASTER early OT observations
  8. Swift follow-up results of the possible weak INTEGRAL GRB
  9. GRB 130903A: Swift/UVOT Upper Limits
  10. GRB 130831A: RATIR Optical and NIR Upper Limits
  11. GRB 130822A: nearby galaxy redshifts
  12. GRB 130903A: GROND Afterglow Discovery
  13. GRB 130831A: JCMT SCUBA-2 sub-mm observation
  14. GRB 130903A: Swift-XRT observations
  15. GRB 130903A: GROND Upper Limits
  16. GRB 130831A: Swift/UVOT Observations
  17. GRB 130831A: Optical Observations via Virtual Telescope, follow-up
  18. GRB 130831A: RATIR Optical and NIR Observations
  19. GRB 130831A: Continued Skynet/PROMPT-SSO, PROMPT-CTIO and Yerkes-41 detections
  20. GRB 130831A: VLA Observations
  21. GRB 130831A: T100 observations
  22. GRB 130831B: Swift/UVOT Upper Limits
  23. GRB 130831B: GROND upper limits
  24. GRB 130831A: optical observations
  25. GRB 130831A: Optical Observations via Virtual Telescope
  26. GRB 130831A: Montarrenti Observatory optical observations
  27. GRB 130831A: Skynet/PROMPT-SSO detections
  28. GRB 130831A: Weihai optical observations
  29. GRB 130829A: AAO optical observations
  30. GRB 130828A: Swift XRT and UVOT observations
  31. GRB 130829A: NOT optical observations
  32. GRB 130828A Tiled Swift observations
  33. GRB 130822A: 5.8 GHz VLA upper limit
  34. GRB 130822A: Gemini Observations
  35. GRB 130822A: WHT ACAM observations
  36. GRB 130822A: Swift/UVOT Upper Limits
  37. GRB 130822A: Weihai optical upper limit
  38. GRB 130816A: Swift/UVOT Upper Limits
  39. GRB 130816B: Swift/UVOT Upper Limits
  40. GRB 130816B: GROND afterglow candidate
  41. GRB 130816A: GROND confirmation of afterglow
  42. GRB 130816A: REM NIR candidate afterglow
  43. GRB 130812A: Swift/UVOT Upper Limits
  44. GRB 130812A: GROND upper limits
  45. Correction to GCN Circ. 15086 "GRB130807A: Swift/UVOT observations"
  46. GRB130807A: Swift/UVOT observations
  47. GRB 130806A: Swift/UVOT Upper Limits
  48. GRB 130623A: GROND detection of the optical/NIR afterglow
  49. GRB130803A: GROND observations
  50. GRB 130803A: RATIR Optical and NIR Observations
  51. GRB130803A: GROND detection of possible host
  52. GRB 130803A: Swift/UVOT Upper Limits
  53. GRB 130803A: Faulkes Telescope South Observations
  54. GRB 130603B: Second epoch of HST WFC/F160W imaging
  55. GRB 130722A: RATIR Optical Observations
  56. GRB 130727A: Swift/UVOT Detection
  57. GRB 130727A: GROND observations
  58. GRB 130727A: Swift-XRT observations
  59. GRB 130727A: Swift-XRT and Swift-UVOT prompt observations
  60. GRB 130725B: Swift/UVOT Observations
  61. GRB130725B: REM-ROS2 optical observations
  62. GRB 130725A: Swift/UVOT Upper Limits
  63. GRB 130725A - Faulkes Telescope South Observations
  64. GRB 130725B: GROND Detection of the Optical/NIR Afterglow
  65. GRB 130725B: Swift/UVOT Detection of an Optical Counterpart
  66. GRB 130719A: Skynet/PROMPT observations
  67. Retraction of GCN Circ. 15020 (GRB 130722C Tiled Swift observations)
  68. GRB 130722A: Swift/UVOT Detection
  69. GRB 130722C Tiled Swift observations
  70. GRB 130722A: Skynet/GORT observations
  71. GRB 130716A: Gemini-North imaging
  72. GRB 130716A: UVOT Upper Limits
  73. GRB 130626A: Retraction of possible X-ray afterglow
  74. GRB 130702A: Maidanak optical observations
  75. GMRT radio detection of GRB 130702A
  76. GRB 130708A: Swift XRT and UVOT Observations
  77. GRB 130702A: TNG spectroscopic observations of the emerging supernova
  78. GRB 130702A: P200 Spectroscopic Confirmation of Associated Supernova
  79. GRB 130702A: Maidanak optical observations
  80. GRB130702A: NOT observation - the detection of an emerging supernova
  81. GRB 130702A: Continued RATIR Optical and NIR Observations
  82. GRB 130702A: Continued UVOT Observations
  83. GRB 130702A (= Fermi 394416326): correction of the GCN #14988 title
  84. GRB 130702Ð
  85. GRB 130702A: WSRT radio detection
  86. GRB130702A: Redshift of Afterglow Candidate iPTF13bxl
  87. GRB 130702A: further TNG observations
  88. GRB 130702A: NOT spectroscopy and redshift of the nearby bright galaxy
  89. GRB 130702A: further Swift-XRT observations
  90. GRB 130702A: Continued P60 observations
  91. GRB 130702A: RATIR Optical and NIR Observations
  92. GRB 130702A: NOT optical observations
  93. GRB 130702A: TNG optical observations
  94. GRB 130702A / Fermi394416326 : Nanshan optical observations
  95. Fermi GRB 130702A: Swift XRT and UVOT observations
  96. Fermi394416326: FTN detection
  97. Fermi394416326: iPTF detection of a possible optical afterglow
  98. GRB 130701A: P60 Observations
  99. GRB 130701A: Swift/UVOT Detection
  100. GRB 130701A: VLT/X-shooter redshift

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