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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"

43594 results found.

  1. GRB 130603B: optical follow-up and independent GTC redshift determination and afterglow spectrum
  2. GRB 130603B: Magellan redshift confirmation
  3. GRB 130603B: Short GRB afterglow spectrum from GTC
  4. GRB 130603B: Afterglow detection from NOT
  5. GRB 130603B: WHT optical afterglow candidate
  6. GRB 130603B: Swift-BAT refined analysis
  7. GRB 130603A: Swift-XRT refined Analysis
  8. GRB 130603B: Enhanced Swift-XRT position
  9. Swift/UVOT observations of GRB130603A
  10. GRB 130603A: Enhanced Swift-XRT position
  11. GRB 130603A: Swift-BAT refined analysis
  12. GRB 130603B: Swift detection of a bright short burst
  13. GRB 130603A: Swift-XRT observations
  14. GRB 130603A: Swift-XRT and Swift-UVOT detections
  15. GRB 130603A: Swift detection of a burst
  16. GRB 130529A: GROND upper limits
  17. GRB 130528A: Fermi GBM detection
  18. GRB 130527A: Suzaku WAM observation of the prompt emission
  19. GRB 130529A: Swift-BAT refined analysis
  20. GRB 130518A: Suzaku WAM observation of the prompt emission
  21. GRB 130529A: Swift-XRT refined Analysis
  22. GRB 130529A: Enhanced Swift-XRT position
  23. Konus-Wind observation of GRB 130528A
  24. Konus-Wind observation of GRB 130527A
  25. GRB 130529A: Prompt enhanced Swift-XRT position
  26. GRB 130528A: Swift-BAT refined analysis
  27. GRB 130529A: Swift detection of a burst
  28. GRB 130528A: Swift-XRT refined Analysis
  29. GRB 130528A: Enhanced Swift-XRT position
  30. GRB 130521A: Skynet/PROMPT detection of an extremely red afterglow
  31. GRB 130528A: optical upper limit
  32. GRB 130528A: Swift detection of a burst
  33. GRB 130527A: NOT optical counterpart
  34. GRB 130527A: RATIR Optical and NIR Observations
  35. GRB 130527A: Swift-BAT refined analysis
  36. GRB 130527A: Swift-XRT refined Analysis
  37. GRB 130527A: BOOTES-2 & 3.5m CAHA opt/nIR observations
  38. GRB 130527A: Enhanced Swift-XRT position
  39. GRB 130527A: Prompt enhanced Swift-XRT position
  40. GRB 130527A: Swift detection of a bright burst
  41. GRB 130514A: Konus-Wind and Swift/BAT joint spectral analysis
  42. Swift Trigger 556533 is not an astrophysical event
  43. GRB 130521B: Suzaku WAM observation of the prompt emission
  44. Swift Trigger 556533 is probably not an astrophysical event
  45. Konus-Wind observation of GRB 130521B
  46. GRB 130521A: Skynet/PROMPT observations
  47. IPN Triangulation of GRB 130521B
  48. GRB 130514B: Further Swift-XRT Observations
  49. GRB 130518B, Swift-BAT refined analysis
  50. GRB 130521A, Swift-BAT refined analysis
  51. GRB 130521A: TAROT La Silla observatory optical observations
  52. GRB 130521A: Swift detection of a burst
  53. Swift XRT observation of GRB 130518B
  54. GRB 130518A: mm detection at PdBI
  55. GRB 130515A: Suzaku WAM observation of the prompt emission
  56. GRB 130518A: Gemini Redshift confirmation
  57. GRB 130427A / SN 2013cq: Hubble Space Telescope Observations
  58. GRB 130518A: 10.4m GTC/OSIRIS redshift
  59. GRB 130518A: Continued RATIR Optical Observations - Fading
  60. Correction to GCN Circular 14682 (GRB 130518B)
  61. GRB 130518B found in ground analysis of Swift-BAT data
  62. GRB 130518A: Confirmation of the X-ray afterglow.
  63. GRB 130518A: P60 Afterglow Observations
  64. GRB 130518A: RATIR Optical and NIR Observations
  65. GRB 130518A: Swift XRT and UVOT possible afterglow
  66. Konus-Wind observation of GRB 130518A
  67. GRB 130518A Swift-BAT position from ground analysis
  68. GRB 130518A: Fermi LAT detection
  69. GRB 130518A: Fermi GBM detection
  70. VLT observations of GRB 130427A
  71. GRB 130427A: Konkoly optical observations
  72. GRB 130515A: IRSF NIR Observation
  73. GRB 130515A: Further Gemini Observations
  74. GRB 130427A:: BTA spectroscopic observations on May 10/11.
  75. Konus-Wind observation of GRB 130515A
  76. GRB 130515A: FORS2 spectroscopy of candidate counterpart
  77. GRB 130427A: Continued RATIR Optical and NIR Observations - Photometric Evidence for a New Component
  78. GRB 130514B: RATIR Optical and NIR Observations
  79. Fermi GBM trigger 390275038 / 130515072 is not a GRB
  80. GRB 130515A: Fermi GBM detection
  81. GRB 130427A: Skynet detections of a possible supernova
  82. GRB 130515A: Swift-XRT refined Analysis
  83. GRB 130515A: Swift/UVOT Upper Limits
  84. GRB 130514B Swift-BAT observations
  85. GRB 130515A: Swift-BAT refined analysis
  86. GRB 130514B: GROND observations
  87. GRB 130515A: Gemini/GMOS Observations
  88. GRB 130515A: GROND Observations
  89. GRB 130515A: Enhanced Swift-XRT position
  90. GRB 130515A: VLT acquisition observation
  91. GRB 130511A: SSO 2.3m observation
  92. GRB 130514B: Swift-XRT Observations
  93. GRB 130515A: Swift detection of a short burst
  94. GRB 130514A: Swift-XRT refined Analysis
  95. GRB 130514A: Skynet/PROMPT/DSO Detections
  96. GRB 130427A: Spectroscopic detection of the SN from the 10.4m GTC
  97. GRB 130427A: optical observations
  98. GRB130514B: MASTER-Net optical observations.
  99. GRB 130514A: RATIR Optical and NIR Observations
  100. GRB 130513A: RATIR Optical and NIR Observations

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