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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"

16117 results found.

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

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