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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 130701A: optical afterglow from the NOT
  2. GRB 130627B: Swift/UVOT Upper Limits
  3. GRB 130627A: Swift/UVOT Upper Limits
  4. GRB 130626A: KAIT Optical Observations
  5. GRB 130626A: RATIR Optical Observations
  6. GRB130627B: Swift/UVOT Observations
  7. GRB 130627B: Swift-XRT observations
  8. GRB 130626A: Swift-XRT possible detection and UVOT upper limits
  9. GRB 130627A: Swift-XRT observations
  10. GRB 130625A: Swift/UVOT Upper Limits
  11. GRB 130623A: Swift-XRT and UVOT observations
  12. GRB 130603B: First epoch of XMM-Newton observations
  13. Swift Trigger 558631: AAO optical observations
  14. GRB 130612A: Continued Skynet/PROMPT/GORT/DSO observations
  15. GRB 130603B: Analogy with GRB 090510A and possible connection with a supernova
  16. GRB 130615A: Continued Skynet/PROMPT Observations
  17. GRB 130610A: TAROT La Silla observatory optical observations
  18. GRB 130610A: CrAO optical observations
  19. GRB 130615A: Zadko observatory - Gingin optical observations
  20. GRB 130615A: TAROT La Silla observatory optical observations
  21. GRB 130615A: Swift/UVOT Upper Limits
  22. GRB 130615A: Skynet/PROMPT Observations
  23. GRB 130615A: GROND afterglow candidate
  24. GRB 130603B: Detection of possible afterglow/kilonova in HST observations
  25. GRB 130612A: iTelescope T21 optical observations
  26. GRB 130603B: HST limits on an underlying supernova
  27. GRB 130610A: iTelescope T21 optical observations
  28. GRB 130612A: ISON-NM optical observations
  29. GRB 130609B: Theoretical redshift estimation
  30. GRB 130612A: Swift/UVOT Detection
  31. GRB 130612A: Zadko observatory - Gingin optical observations
  32. GRB 130612A: TAROT La Silla observatory optical observations
  33. GRB 130612A: VLT/X-shooter redshift
  34. GRB130612A OSN I-band observations
  35. GRB 130612A: RATIR Optical Observations
  36. GRB 130612A: P60 Observations
  37. GRB 130612A: NOT optical observations
  38. GRB 130612A: Skynet/PROMPT detection of the optical afterglow
  39. GRB 130612A: PAIRITEL NIR Afterglow Observations
  40. GRB 130612A: Liverpool Telescope Afterglow detection
  41. GRB 130609A: Swift/UVOT Upper Limits
  42. GRB 130608A: Swift/UVOT Upper Limits
  43. GRB 130609B: GROND observations
  44. GMRT radio observation of GRB 130603B
  45. GRB 130609A: Radio Observations (5.8, 22 and 85 GHz)
  46. GRB 130608A: ISON-Kislovodsk optical upper limit
  47. GRB 130610A: ISON-NM optical observations
  48. GRB 130610A: Swift/UVOT Observations
  49. GRB 130609B: Swift/UVOT Observations
  50. GRB 130606B: Swift/UVOT Upper Limit
  51. GRB 130610A: P60 Observations
  52. GRB 130610A: PAIRITEL NIR Afterglow Observations
  53. GRB 130610A: Skynet/PROMPT detection of the optical afterglow
  54. GRB 130610A - Liverpool Telescope Optical Afterglow Confirmation
  55. GRB 130606A - Liverpool Telescope and Faulkes Telescope North optical observations
  56. GRB 130608A: RATIR Optical and NIR Observations
  57. GRB 130609A: RATIR Optical and NIR Observations
  58. GRB 130609A: P60 nondetection
  59. GRB 130606A: Continued Skynet/PROMPT observations
  60. GRB 130606A: Continued RATIR Optical and NIR Monitoring
  61. GRB 130606B: RATIR Optical and NIR Observations
  62. Swift Trigger 557674 is a probable new Galactic transient
  63. GRB 130606B: Swift-XRT observations
  64. GRB 130606A: TAROT Calern observatory early optical observations
  65. GRB 130606A: EVLA detection
  66. GRB 130606A: VLT/X-shooter redshift confirmation
  67. GRB 130606A: Skynet/PROMPT detection of the optical afterglow
  68. GRB 130606A: Swift/UVOT Upper Limits
  69. GRB 130603A: AAO optical observations
  70. GRB 130606A: GROND Detection of the Optical/NIR Afterglow
  71. GRB 130606A: AAO optical observations
  72. GRB 130606A: P60 Observations
  73. GRB 130606A: PAIRITEL NIR Afterglow Observations
  74. GRB 130606A: RATIR r'-band Dropout
  75. GRB 130606A:T100 observations
  76. GRB 130606B: Fermi-LAT detection of a bright hard burst
  77. GRB130606A: Montarrenti Observatory afterglow detection
  78. GRB 130606A: 10.4m GTC spectroscopy indicates z = 6.1
  79. Virtual Telescope observations of GRB 130606A
  80. GRB 130606A - Liverpool Telescope Optical Afterglow Confirmation
  81. GRB 130606A: NOT afterglow detection
  82. GRB 130605A: Swift/UVOT Detection
  83. GRB 130605A: Continued Skynet/PROMPT observations
  84. GRB 130605A: Skynet/PROMPT detection of a fading afterglow
  85. GRB 130605A: TAROT La Silla observatory optical detection of the afterglow
  86. GRB 130605A: GROND afterglow candidate
  87. GRB 130603B: MASTER-Net early observations and optical sloap limit
  88. GRB 130603B: AMI-LA 15GHz observations
  89. GRB 130604A: Swift/UVOT Upper Limits
  90. GRB 130603B: RATIR Optical and NIR Observations
  91. GRB 130604A: Gemini North Spectroscopy
  92. GRB 130603B: P60 Observations
  93. GRB130603B: Swift/UVOT detection
  94. GRB 130603B: VLT/X-shooter redshift confirmation
  95. GRB 130604A: KAIT optical upper limit
  96. GRB 130604A: P60 optical afterglow candidate
  97. GRB 130603B: 5.8 GHz VLA detection
  98. GRB 130603A: SON optical observations
  99. GRB 130603B: Gemini Observations
  100. GRB 130603B: Magellan redshift confirmation

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