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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"
  1. GRB 130518A: Suzaku WAM observation of the prompt emission
  2. GRB 130529A: Swift-XRT refined Analysis
  3. GRB 130529A: Enhanced Swift-XRT position
  4. Konus-Wind observation of GRB 130528A
  5. GRB 130528A: Swift/UVOT Upper Limits
  6. Konus-Wind observation of GRB 130527A
  7. GRB 130529A: Prompt enhanced Swift-XRT position
  8. GRB 130528A: Swift-BAT refined analysis
  9. GRB 130529A: Swift detection of a burst
  10. GRB 130528A: Swift-XRT refined Analysis
  11. GRB 130527A: Swift/UVOT Upper Limits
  12. GRB 130528A: Enhanced Swift-XRT position
  13. GRB 130521A: Skynet/PROMPT detection of an extremely red afterglow
  14. GRB 130528A: optical upper limit
  15. GRB 130528A: Swift detection of a burst
  16. GRB 130527A: NOT optical counterpart
  17. GRB 130527A: RATIR Optical and NIR Observations
  18. GRB 130527A: Swift-BAT refined analysis
  19. GRB 130527A: Swift-XRT refined Analysis
  20. GRB 130527A: BOOTES-2 & 3.5m CAHA opt/nIR observations
  21. GRB 130527A: Enhanced Swift-XRT position
  22. GRB 130527A: Prompt enhanced Swift-XRT position
  23. GRB 130527A: Swift detection of a bright burst
  24. GRB 130514A: Konus-Wind and Swift/BAT joint spectral analysis
  25. Swift Trigger 556533 is not an astrophysical event
  26. GRB 130521B: Suzaku WAM observation of the prompt emission
  27. Swift Trigger 556533 is probably not an astrophysical event
  28. Konus-Wind observation of GRB 130521B
  29. GRB 130521A: Skynet/PROMPT observations
  30. IPN Triangulation of GRB 130521B
  31. GRB 130514B: Further Swift-XRT Observations
  32. GRB 130518B, Swift-BAT refined analysis
  33. GRB 130521A, Swift-BAT refined analysis
  34. GRB 130521A: TAROT La Silla observatory optical observations
  35. GRB 130521A: Swift detection of a burst
  36. Swift XRT observation of GRB 130518B
  37. GRB 130518A: mm detection at PdBI
  38. GRB 130515A: Suzaku WAM observation of the prompt emission
  39. GRB 130518A: Gemini Redshift confirmation
  40. GRB 130427A / SN 2013cq: Hubble Space Telescope Observations
  41. GRB 130518A: 10.4m GTC/OSIRIS redshift
  42. GRB 130518A: Continued RATIR Optical Observations - Fading
  43. Correction to GCN Circular 14682 (GRB 130518B)
  44. GRB 130518B found in ground analysis of Swift-BAT data
  45. GRB 130518A: Confirmation of the X-ray afterglow.
  46. GRB 130518A: P60 Afterglow Observations
  47. GRB 130518A: RATIR Optical and NIR Observations
  48. GRB 130518A: Swift XRT and UVOT possible afterglow
  49. Konus-Wind observation of GRB 130518A
  50. GRB 130518A Swift-BAT position from ground analysis
  51. GRB 130518A: Fermi LAT detection
  52. GRB 130518A: Fermi GBM detection
  53. VLT observations of GRB 130427A
  54. GRB 130427A: Konkoly optical observations
  55. GRB 130515A: IRSF NIR Observation
  56. GRB 130515A: Further Gemini Observations
  57. GRB 130427A:: BTA spectroscopic observations on May 10/11.
  58. Konus-Wind observation of GRB 130515A
  59. GRB 130515A: FORS2 spectroscopy of candidate counterpart
  60. GRB 130427A: Continued RATIR Optical and NIR Observations - Photometric Evidence for a New Component
  61. GRB 130514B: RATIR Optical and NIR Observations
  62. Fermi GBM trigger 390275038 / 130515072 is not a GRB
  63. GRB 130515A: Fermi GBM detection
  64. GRB 130427A: Skynet detections of a possible supernova
  65. GRB 130515A: Swift-XRT refined Analysis
  66. GRB 130515A: Swift/UVOT Upper Limits
  67. GRB 130514B Swift-BAT observations
  68. GRB 130515A: Swift-BAT refined analysis
  69. GRB 130514B: GROND observations
  70. GRB 130515A: Gemini/GMOS Observations
  71. GRB 130515A: GROND Observations
  72. GRB 130515A: Enhanced Swift-XRT position
  73. GRB 130515A: VLT acquisition observation
  74. GRB 130511A: SSO 2.3m observation
  75. GRB 130514B: Swift-XRT Observations
  76. GRB 130515A: Swift detection of a short burst
  77. GRB 130514A: Swift-XRT refined Analysis
  78. GRB 130514A: Skynet/PROMPT/DSO Detections
  79. GRB 130513A: Bassano Bresciano optical upper limit
  80. GRB 130427A: Spectroscopic detection of the SN from the 10.4m GTC
  81. GRB 130427A: optical observations
  82. GRB130514B: MASTER-Net optical observations.
  83. GRB 130514A: RATIR Optical and NIR Observations
  84. GRB 130513A: RATIR Optical and NIR Observations
  85. GRB 130513A: Swift/UVOT Upper Limits
  86. GRB 130514A: Swift/UVOT Upper Limits
  87. GRB 130513A: GROND observations
  88. GRB 130514B: a long GRB detected by INTEGRAL
  89. GRB 130514A: Enhanced Swift-XRT position
  90. GRB 130514A: Swift-BAT refined analysis
  91. GRB 130513A: Swift-XRT detection of the afterglow.
  92. GRB 130514A: GROND optical-NIR afterglow discovery and photo-z
  93. GRB 130514A: P60 Observations
  94. GRB 130514A: Swift detection of a burst
  95. GRB 130427A: Tautenburg 2nd epoch: No break, no clear SN
  96. GRB 130513A: a long GRB detected by INTEGRAL
  97. GRB130508A: MASTER-Net optical observations
  98. GRB130511A: SOAO Optical Observation
  99. GRB 130511A: Swift-XRT refined Analysis
  100. GRB 130511A: Kanata/HOWPol optical observation

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