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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"

16112 results found.

  1. GRB 130606A: AAO optical observations
  2. GRB 130606A: PAIRITEL NIR Afterglow Observations
  3. GRB 130606A: LOAO IZY Observation
  4. GRB 130606A: RATIR r'-band Dropout
  5. GRB 130606A: MMT Spectroscopy
  6. GRB 130606A: 10.4m GTC spectroscopy indicates z = 6.1
  7. GRB 130606A - Liverpool Telescope Optical Afterglow Confirmation
  8. GRB 130606A: NOT afterglow detection
  9. GRB 130606A: optical afterglow with BOOTES-2/TELMA and 1.23m CAHA
  10. GRB 130605A: Swift/UVOT Detection
  11. GRB 130605A: TAROT La Silla observatory optical decay
  12. GRB 130605A: TAROT La Silla observatory optical detection of the afterglow
  13. GRB 130603B: MASTER-Net early observations and optical sloap limit
  14. GRB 130604A: Swift/UVOT Upper Limits
  15. GRB 130603B: RATIR Optical and NIR Observations
  16. GRB 130604A: Gemini North Spectroscopy
  17. GRB 130603B: P60 Observations
  18. GRB 130604A: MITSuME Okayama upper limits
  19. GRB130603B: Swift/UVOT detection
  20. GRB 130604A: further ISON-NM optical observation
  21. GRB 130603B: VLT/X-shooter redshift confirmation
  22. GRB 130604A: ISON-NM optical upper limit
  23. GRB 130603A: MITSuME Akeno Optical observation
  24. GRB 130604A: KAIT optical upper limit
  25. GRB 130604A: P60 optical afterglow candidate
  26. GRB 130603B: 5.8 GHz VLA detection
  27. GRB 130603A: SON optical observations
  28. GRB 130603B: Gemini Observations
  29. GRB 130603B: optical follow-up and independent GTC redshift determination and afterglow spectrum
  30. GRB 130603B: Magellan redshift confirmation
  31. GRB 130603B: WHT optical afterglow candidate
  32. Swift/UVOT observations of GRB130603A
  33. GRB 130603A: MITSuME Okayama Optical Observation
  34. GRB 130529A: Swift/UVOT Upper Limits
  35. GRB 130528A: Swift/UVOT Upper Limits
  36. GRB 130527A: Swift/UVOT Upper Limits
  37. GRB 130528A: optical upper limit
  38. GRB 130527A: NOT optical counterpart
  39. GRB 130527A: RATIR Optical and NIR Observations
  40. GRB 130527A: BOOTES-2 & 3.5m CAHA opt/nIR observations
  41. Swift Trigger 556533 is not an astrophysical event
  42. GRB 130521A: TAROT La Silla observatory optical observations
  43. GRB 130518A: mm detection at PdBI
  44. GRB 130427A / SN 2013cq: Hubble Space Telescope Observations
  45. GRB 130518A: 10.4m GTC/OSIRIS redshift
  46. GRB 130518A: Continued RATIR Optical Observations - Fading
  47. GRB 130518A: P60 Afterglow Observations
  48. GRB 130518A: RATIR Optical and NIR Observations
  49. GRB 130518A: Swift XRT and UVOT possible afterglow
  50. GRB 130427A: Konkoly optical observations
  51. GRB 130515A: Further Gemini Observations
  52. GRB 130427A:: BTA spectroscopic observations on May 10/11.
  53. GRB 130427A: Continued RATIR Optical and NIR Observations - Photometric Evidence for a New Component
  54. GRB 130514B: RATIR Optical and NIR Observations
  55. GRB 130427A: Skynet detections of a possible supernova
  56. GRB 130515A: Swift/UVOT Upper Limits
  57. GRB 130511A: SSO 2.3m observation
  58. GRB 130513A: Bassano Bresciano optical upper limit
  59. GRB 130427A: Spectroscopic detection of the SN from the 10.4m GTC
  60. GRB 130427A: optical observations
  61. GRB130514B: MASTER-Net optical observations.
  62. GRB 130514A: RATIR Optical and NIR Observations
  63. GRB 130513A: RATIR Optical and NIR Observations
  64. GRB 130513A: Swift/UVOT Upper Limits
  65. GRB 130514A: Swift/UVOT Upper Limits
  66. GRB 130514A: GROND optical-NIR afterglow discovery and photo-z
  67. GRB 130514A: P60 Observations
  68. GRB 130427A: Tautenburg 2nd epoch: No break, no clear SN
  69. GRB130508A: MASTER-Net optical observations
  70. GRB130511A: SOAO Optical Observation
  71. GRB 130511A: Kanata/HOWPol optical observation
  72. GRB 130511A: MITSuME Okayama upper limits
  73. GRB 130511A: Upper limit by Xinglong TNT optical observation
  74. GRB 130511A: Gemini-North Redshift
  75. GRB 130511A: Swift detection of a burst with an optical counterpart
  76. GRB 130508A: MITSuME Akeno upper limits
  77. GRB 130508A: RATIR Optical and NIR Observations
  78. GRB 130427A: Keck/LRIS Observations
  79. GRB 130508A: MITSuME Okayama upper limits
  80. GRB130508A: BOOTES-3 optical limit
  81. GRB 130427A: Ten nights of Skynet/PROMPT/GORT observations
  82. GRB 130427A: Continued RATIR Optical and NIR Observations
  83. GRB 130427A, LBT optical spectrum
  84. GRB 130505B: Further Swift observations
  85. GRB 130505A: MITSuME Akeno Optical observation
  86. GRB 130427A, Watcher afterglow detection
  87. GRB 130427A: Excess optical emission consistent with an emerging supernova
  88. GRB 130505A: RATIR Optical and NIR Observations
  89. GRB 130505A: Tautenburg afterglow observations
  90. GRB 130427A: Tautenburg afterglow observations
  91. GRB 130505A: optical observations
  92. GRB 130427A: optical observations in CrAO
  93. GRB 130502A: optical upper limit
  94. Swift/UVOT observations of GRB130505A
  95. GRB 130505A: iTelescope T12 optical observations
  96. GRB 130505A: Xinglong TNT optical observations
  97. GRB 130505A; Weihai optical observations
  98. GRB 130505A: MITSuME Okayama Optical Observation
  99. GRB 130504A: IAC80 optical candidate
  100. GRB 130505A: Swift detection of a burst with optical afterglow

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