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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"

28269 results found.

  1. GRB 130606A: P60 Observations
  2. GRB 130606A: PAIRITEL NIR Afterglow Observations
  3. GRB 130606A: LOAO IZY Observation
  4. GRB 130606A: RATIR r'-band Dropout
  5. GRB 130606A:T100 observations
  6. GRB 130606B: Fermi-LAT detection of a bright hard burst
  7. GRB130606A: Montarrenti Observatory afterglow detection
  8. Virtual Telescope observations of GRB 130606A
  9. GRB 130605A: Swift-XRT refined Analysis
  10. GRB 130605A: Swift-BAT refined analysis
  11. Swift Trigger 557466 is not astrophysical
  12. GRB 130606A - Liverpool Telescope Optical Afterglow Confirmation
  13. GRB 130606A: IRSF NIR Observation
  14. GRB 130606A: NOT afterglow detection
  15. GRB 130606A: Swift detection of a burst
  16. GRB 130605A: Swift/UVOT Detection
  17. GRB 130604A: Swift-BAT refined analysis
  18. GRB 130605A: Continued Skynet/PROMPT observations
  19. GRB 130605A: TAROT La Silla observatory optical decay
  20. GRB 130605A: Skynet/PROMPT detection of a fading afterglow
  21. GRB 130605A: TAROT La Silla observatory optical detection of the afterglow
  22. GRB 130605A: GROND afterglow candidate
  23. GRB 130605A: Swift detection of a burst
  24. GRB 130603B: AMI-LA 15GHz observations
  25. GRB 130604A: Swift/UVOT Upper Limits
  26. Swift Trigger 557466 is probably not real.
  27. GRB 130604A: Swift-XRT refined Analysis
  28. GRB 130604B: Fermi GBM detection
  29. GRB 130603B: RATIR Optical and NIR Observations
  30. GRB 130604A: Enhanced Swift-XRT position
  31. GRB 130603B: P60 Observations
  32. GRB 130604A: MITSuME Okayama upper limits
  33. GRB130603B: Swift/UVOT detection
  34. GRB 130604A: ISON-NM optical upper limit
  35. GRB 130603A: MITSuME Akeno Optical observation
  36. GRB 130604A: Swift detection of a burst
  37. GRB 130603B: 5.8 GHz VLA detection
  38. GRB 130603A: SON optical observations
  39. GRB 130603B: Swift-XRT refined Analysis
  40. GRB 130603B: Gemini Observations
  41. GRB 130603B: optical follow-up and independent GTC redshift determination and afterglow spectrum
  42. GRB 130603B: Magellan redshift confirmation
  43. GRB 130603B: Afterglow detection from NOT
  44. GRB 130603B: WHT optical afterglow candidate
  45. GRB 130603B: Swift-BAT refined analysis
  46. GRB 130603A: Swift-XRT refined Analysis
  47. GRB 130603B: Enhanced Swift-XRT position
  48. Swift/UVOT observations of GRB130603A
  49. GRB 130603A: Enhanced Swift-XRT position
  50. GRB 130603A: Swift-BAT refined analysis
  51. GRB 130603B: Swift detection of a bright short burst
  52. GRB 130603A: MITSuME Okayama Optical Observation
  53. GRB 130603A: Swift-XRT observations
  54. GRB 130603A: Swift-XRT and Swift-UVOT detections
  55. GRB 130603A: Swift detection of a burst
  56. GRB 130529A: GROND upper limits
  57. GRB 130529A: Swift/UVOT Upper Limits
  58. GRB 130527A: Suzaku WAM observation of the prompt emission
  59. GRB 130529A: Swift-BAT refined analysis
  60. GRB 130518A: Suzaku WAM observation of the prompt emission
  61. GRB 130529A: Swift-XRT refined Analysis
  62. GRB 130529A: Enhanced Swift-XRT position
  63. GRB 130528A: Swift/UVOT Upper Limits
  64. GRB 130528A: Swift-BAT refined analysis
  65. GRB 130529A: Swift detection of a burst
  66. GRB 130528A: Swift-XRT refined Analysis
  67. GRB 130527A: Swift/UVOT Upper Limits
  68. GRB 130528A: Enhanced Swift-XRT position
  69. GRB 130521A: Skynet/PROMPT detection of an extremely red afterglow
  70. GRB 130528A: optical upper limit
  71. GRB 130528A: Swift detection of a burst
  72. GRB 130527A: NOT optical counterpart
  73. GRB 130527A: RATIR Optical and NIR Observations
  74. GRB 130527A: Swift-BAT refined analysis
  75. GRB 130527A: Swift-XRT refined Analysis
  76. GRB 130527A: Enhanced Swift-XRT position
  77. GRB 130527A: Swift detection of a bright burst
  78. GRB 130514A: Konus-Wind and Swift/BAT joint spectral analysis
  79. Swift Trigger 556533 is not an astrophysical event
  80. GRB 130521B: Suzaku WAM observation of the prompt emission
  81. Swift Trigger 556533 is probably not an astrophysical event
  82. GRB 130521A: Skynet/PROMPT observations
  83. GRB 130521A, Swift-BAT refined analysis
  84. GRB 130521A: TAROT La Silla observatory optical observations
  85. GRB 130515A: Suzaku WAM observation of the prompt emission
  86. GRB 130427A / SN 2013cq: Hubble Space Telescope Observations
  87. GRB 130518A: Continued RATIR Optical Observations - Fading
  88. GRB 130518A: Confirmation of the X-ray afterglow.
  89. GRB 130518A: RATIR Optical and NIR Observations
  90. GRB 130518A: Swift XRT and UVOT possible afterglow
  91. GRB 130518A: Fermi GBM detection
  92. VLT observations of GRB 130427A
  93. GRB 130427A: Konkoly optical observations
  94. GRB 130515A: IRSF NIR Observation
  95. GRB 130515A: Further Gemini Observations
  96. Konus-Wind observation of GRB 130515A
  97. GRB 130427A: Continued RATIR Optical and NIR Observations - Photometric Evidence for a New Component
  98. GRB 130514B: RATIR Optical and NIR Observations
  99. GRB 130427A: Skynet detections of a possible supernova
  100. GRB 130515A: Swift-XRT refined Analysis

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