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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

16211 results found.

  1. Swift Trigger 558631: AAO optical observations
  2. GRB 130612A: Continued Skynet/PROMPT/GORT/DSO observations
  3. GRB 130615A: Continued Skynet/PROMPT Observations
  4. GRB 130610A: TAROT La Silla observatory optical observations
  5. GRB 130610A: CrAO optical observations
  6. GRB 130615A: Zadko observatory - Gingin optical observations
  7. GRB 130615A: TAROT La Silla observatory optical observations
  8. GRB 130615A: Swift/UVOT Upper Limits
  9. GRB 130615A: Skynet/PROMPT Observations
  10. GRB 130603B: Detection of possible afterglow/kilonova in HST observations
  11. GRB 130612A: iTelescope T21 optical observations
  12. GRB 130610A: iTelescope T21 optical observations
  13. GRB 130612A: ISON-NM optical observations
  14. GRB 130612A: MITSuME Okayama upper limits
  15. GRB 130612A: Zadko observatory - Gingin optical observations
  16. GRB 130612A: TAROT La Silla observatory optical observations
  17. GRB 130612A: RATIR Optical Observations
  18. GRB 130612A: P60 Observations
  19. GRB 130612A: NOT optical observations
  20. GRB 130612A: Skynet/PROMPT detection of the optical afterglow
  21. GRB 130612A: PAIRITEL NIR Afterglow Observations
  22. GRB 130612A: Swift detection of a burst with an optical counterpart
  23. GRB 130606A: CrAO optical upper limit
  24. GRB 130609A: Radio Observations (5.8, 22 and 85 GHz)
  25. GRB 130608A: ISON-Kislovodsk optical upper limit
  26. GRB 130610A: ISON-NM optical observations
  27. GRB 130606B: Swift/UVOT Upper Limit
  28. GRB 130610A: LOAO BVR Observation
  29. GRB 130610A: P60 Observations
  30. GRB 130610A: PAIRITEL NIR Afterglow Observations
  31. GRB 130610A: Skynet/PROMPT detection of the optical afterglow
  32. GRB 130610A - Liverpool Telescope Optical Afterglow Confirmation
  33. GRB 130610A: Swift detection of a burst with an optical counterpart
  34. GRB 130609B: Swift detection of a burst with an optical counterpart
  35. GRB 130606A - Liverpool Telescope and Faulkes Telescope North optical observations
  36. GRB 130608A: RATIR Optical and NIR Observations
  37. GRB 130609A: RATIR Optical and NIR Observations
  38. GRB 130606A: Continued Skynet/PROMPT observations
  39. GRB 130606A: Continued RATIR Optical and NIR Monitoring
  40. GRB 130606B: RATIR Optical and NIR Observations
  41. GRB 130606A: TAROT Calern observatory early optical observations
  42. GRB 130606A: EVLA detection
  43. GRB 130606A: VLT/X-shooter redshift confirmation
  44. GRB 130606A: Skynet/PROMPT detection of the optical afterglow
  45. GRB 130606A: Swift/UVOT Upper Limits
  46. GRB 130603A: AAO optical observations
  47. GRB 130606A: GROND Detection of the Optical/NIR Afterglow
  48. GRB 130606A: AAO optical observations
  49. GRB 130606A: PAIRITEL NIR Afterglow Observations
  50. GRB 130606A: LOAO IZY Observation
  51. GRB 130606A: RATIR r'-band Dropout
  52. GRB 130606A: MMT Spectroscopy
  53. GRB 130606A: 10.4m GTC spectroscopy indicates z = 6.1
  54. GRB 130606A - Liverpool Telescope Optical Afterglow Confirmation
  55. GRB 130606A: NOT afterglow detection
  56. GRB 130606A: optical afterglow with BOOTES-2/TELMA and 1.23m CAHA
  57. GRB 130605A: Swift/UVOT Detection
  58. GRB 130605A: Continued Skynet/PROMPT observations
  59. GRB 130605A: TAROT La Silla observatory optical decay
  60. GRB 130605A: TAROT La Silla observatory optical detection of the afterglow
  61. GRB 130603B: MASTER-Net early observations and optical sloap limit
  62. GRB 130604A: Swift/UVOT Upper Limits
  63. GRB 130603B: RATIR Optical and NIR Observations
  64. GRB 130604A: Gemini North Spectroscopy
  65. GRB 130603B: P60 Observations
  66. GRB 130604A: MITSuME Okayama upper limits
  67. GRB130603B: Swift/UVOT detection
  68. GRB 130604A: further ISON-NM optical observation
  69. GRB 130603B: VLT/X-shooter redshift confirmation
  70. GRB 130604A: ISON-NM optical upper limit
  71. GRB 130603A: MITSuME Akeno Optical observation
  72. GRB 130604A: KAIT optical upper limit
  73. GRB 130604A: P60 optical afterglow candidate
  74. GRB 130603B: 5.8 GHz VLA detection
  75. GRB 130603A: SON optical observations
  76. GRB 130603B: Gemini Observations
  77. GRB 130603B: optical follow-up and independent GTC redshift determination and afterglow spectrum
  78. GRB 130603B: Magellan redshift confirmation
  79. GRB 130603B: WHT optical afterglow candidate
  80. Swift/UVOT observations of GRB130603A
  81. GRB 130603A: MITSuME Okayama Optical Observation
  82. GRB 130529A: Swift/UVOT Upper Limits
  83. GRB 130528A: Swift/UVOT Upper Limits
  84. GRB 130527A: Swift/UVOT Upper Limits
  85. GRB 130528A: optical upper limit
  86. GRB 130527A: NOT optical counterpart
  87. GRB 130527A: RATIR Optical and NIR Observations
  88. GRB 130527A: BOOTES-2 & 3.5m CAHA opt/nIR observations
  89. Swift Trigger 556533 is not an astrophysical event
  90. GRB 130521A: TAROT La Silla observatory optical observations
  91. GRB 130518A: mm detection at PdBI
  92. GRB 130427A / SN 2013cq: Hubble Space Telescope Observations
  93. GRB 130518A: 10.4m GTC/OSIRIS redshift
  94. GRB 130518A: Continued RATIR Optical Observations - Fading
  95. GRB 130518A: P60 Afterglow Observations
  96. GRB 130518A: RATIR Optical and NIR Observations
  97. GRB 130518A: Swift XRT and UVOT possible afterglow
  98. GRB 130427A: Konkoly optical observations
  99. GRB 130515A: Further Gemini Observations
  100. GRB 130427A:: BTA spectroscopic observations on May 10/11.

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