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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"

20948 results found.

  1. GRB 130610A - Liverpool Telescope Optical Afterglow Confirmation
  2. GRB 130606A - Liverpool Telescope and Faulkes Telescope North optical observations
  3. GRB 130608A: RATIR Optical and NIR Observations
  4. GRB 130609A: RATIR Optical and NIR Observations
  5. GRB 130609A: P60 nondetection
  6. GRB 130606A: Continued Skynet/PROMPT observations
  7. GRB 130606A: Continued RATIR Optical and NIR Monitoring
  8. GRB 130606B: RATIR Optical and NIR Observations
  9. Swift Trigger 557674 is a probable new Galactic transient
  10. GRB 130606B: Swift-XRT observations
  11. GRB 130606A: TAROT Calern observatory early optical observations
  12. GRB 130606A: EVLA detection
  13. GRB 130606A: VLT/X-shooter redshift confirmation
  14. GRB 130606A: Skynet/PROMPT detection of the optical afterglow
  15. GRB 130606A: Swift/UVOT Upper Limits
  16. GRB 130603A: AAO optical observations
  17. GRB 130606A: GROND Detection of the Optical/NIR Afterglow
  18. GRB 130606A: AAO optical observations
  19. GRB 130606A: P60 Observations
  20. GRB 130606A: PAIRITEL NIR Afterglow Observations
  21. GRB 130606A: RATIR r'-band Dropout
  22. GRB 130606A:T100 observations
  23. GRB 130606B: Fermi-LAT detection of a bright hard burst
  24. GRB130606A: Montarrenti Observatory afterglow detection
  25. GRB 130606A: 10.4m GTC spectroscopy indicates z = 6.1
  26. Virtual Telescope observations of GRB 130606A
  27. GRB 130606A - Liverpool Telescope Optical Afterglow Confirmation
  28. GRB 130606A: NOT afterglow detection
  29. GRB 130605A: Swift/UVOT Detection
  30. GRB 130605A: Continued Skynet/PROMPT observations
  31. GRB 130605A: Skynet/PROMPT detection of a fading afterglow
  32. GRB 130605A: TAROT La Silla observatory optical detection of the afterglow
  33. GRB 130605A: GROND afterglow candidate
  34. GRB 130603B: MASTER-Net early observations and optical sloap limit
  35. GRB 130603B: AMI-LA 15GHz observations
  36. GRB 130604A: Swift/UVOT Upper Limits
  37. GRB 130603B: RATIR Optical and NIR Observations
  38. GRB 130604A: Gemini North Spectroscopy
  39. GRB 130603B: P60 Observations
  40. GRB130603B: Swift/UVOT detection
  41. GRB 130603B: VLT/X-shooter redshift confirmation
  42. GRB 130604A: KAIT optical upper limit
  43. GRB 130604A: P60 optical afterglow candidate
  44. GRB 130603B: 5.8 GHz VLA detection
  45. GRB 130603A: SON optical observations
  46. GRB 130603B: Gemini Observations
  47. GRB 130603B: Magellan redshift confirmation
  48. GRB 130603B: Afterglow detection from NOT
  49. GRB 130603B: WHT optical afterglow candidate
  50. Swift/UVOT observations of GRB130603A
  51. GRB 130603A: Swift-XRT observations
  52. GRB 130529A: GROND upper limits
  53. GRB 130529A: Swift/UVOT Upper Limits
  54. GRB 130528A: Swift/UVOT Upper Limits
  55. GRB 130527A: Swift/UVOT Upper Limits
  56. GRB 130521A: Skynet/PROMPT detection of an extremely red afterglow
  57. GRB 130527A: NOT optical counterpart
  58. GRB 130527A: RATIR Optical and NIR Observations
  59. GRB 130527A: BOOTES-2 & 3.5m CAHA opt/nIR observations
  60. Swift Trigger 556533 is not an astrophysical event
  61. GRB 130521A: Skynet/PROMPT observations
  62. GRB 130514B: Further Swift-XRT Observations
  63. GRB 130521A: TAROT La Silla observatory optical observations
  64. GRB 130518A: mm detection at PdBI
  65. GRB 130518A: Gemini Redshift confirmation
  66. GRB 130427A / SN 2013cq: Hubble Space Telescope Observations
  67. GRB 130518A: 10.4m GTC/OSIRIS redshift
  68. GRB 130518A: Continued RATIR Optical Observations - Fading
  69. GRB 130518A: Confirmation of the X-ray afterglow.
  70. GRB 130518A: P60 Afterglow Observations
  71. GRB 130518A: RATIR Optical and NIR Observations
  72. GRB 130518A: Swift XRT and UVOT possible afterglow
  73. VLT observations of GRB 130427A
  74. GRB 130427A: Konkoly optical observations
  75. GRB 130515A: Further Gemini Observations
  76. GRB 130427A:: BTA spectroscopic observations on May 10/11.
  77. GRB 130515A: FORS2 spectroscopy of candidate counterpart
  78. GRB 130427A: Continued RATIR Optical and NIR Observations - Photometric Evidence for a New Component
  79. GRB 130514B: RATIR Optical and NIR Observations
  80. GRB 130427A: Skynet detections of a possible supernova
  81. GRB 130515A: Swift/UVOT Upper Limits
  82. GRB 130514B Swift-BAT observations
  83. GRB 130514B: GROND observations
  84. GRB 130515A: Gemini/GMOS Observations
  85. GRB 130515A: GROND Observations
  86. GRB 130514B: Swift-XRT Observations
  87. GRB 130514A: Skynet/PROMPT/DSO Detections
  88. GRB 130513A: Bassano Bresciano optical upper limit
  89. GRB 130427A: Spectroscopic detection of the SN from the 10.4m GTC
  90. GRB 130427A: optical observations
  91. GRB130514B: MASTER-Net optical observations.
  92. GRB 130514A: RATIR Optical and NIR Observations
  93. GRB 130513A: RATIR Optical and NIR Observations
  94. GRB 130513A: Swift/UVOT Upper Limits
  95. GRB 130514A: Swift/UVOT Upper Limits
  96. GRB 130513A: GROND observations
  97. GRB 130514A: GROND optical-NIR afterglow discovery and photo-z
  98. GRB 130514A: P60 Observations
  99. GRB 130427A: Tautenburg 2nd epoch: No break, no clear SN
  100. GRB130508A: MASTER-Net optical observations

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