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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"

19710 results found.

  1. GRB130608A: BOOTES-2/TELMA upper limits
  2. GRB 130609A: Swift detection of a burst
  3. GRB 130608A: Swift detection of a burst
  4. GRB 130606A: Continued Skynet/PROMPT observations
  5. GRB 130606A: Continued RATIR Optical and NIR Monitoring
  6. GRB 130606B: RATIR Optical and NIR Observations
  7. GRB 130606B: Swift-XRT observations
  8. GRB 130606A: TAROT Calern observatory early optical observations
  9. GRB 130606A: Skynet/PROMPT detection of the optical afterglow
  10. GRB 130606A: Swift/UVOT Upper Limits
  11. GRB 130603A: AAO optical observations
  12. GRB 130606A: Enhanced Swift-XRT position
  13. GRB 130606A: GROND Detection of the Optical/NIR Afterglow
  14. GRB 130606A: AAO optical observations
  15. GRB 130606A: P60 Observations
  16. GRB 130606A: PAIRITEL NIR Afterglow Observations
  17. GRB 130606A: RATIR r'-band Dropout
  18. GRB 130606A:T100 observations
  19. GRB 130606B: Fermi-LAT detection of a bright hard burst
  20. GRB130606A: Montarrenti Observatory afterglow detection
  21. Virtual Telescope observations of GRB 130606A
  22. GRB 130605A: Swift-XRT refined Analysis
  23. GRB 130606A - Liverpool Telescope Optical Afterglow Confirmation
  24. GRB 130606A: IRSF NIR Observation
  25. GRB 130606A: NOT afterglow detection
  26. GRB 130606A: Swift detection of a burst
  27. GRB 130605A: Swift/UVOT Detection
  28. GRB 130605A: Continued Skynet/PROMPT observations
  29. GRB 130605A: Skynet/PROMPT detection of a fading afterglow
  30. GRB 130605A: TAROT La Silla observatory optical detection of the afterglow
  31. GRB 130605A: GROND afterglow candidate
  32. GRB 130605A: Swift detection of a burst
  33. GRB 130604A: Swift/UVOT Upper Limits
  34. Swift Trigger 557466 is probably not real.
  35. GRB 130603B: RATIR Optical and NIR Observations
  36. GRB 130604A: Enhanced Swift-XRT position
  37. GRB 130604A: Gemini North Spectroscopy
  38. GRB 130603B: P60 Observations
  39. GRB 130604A: MITSuME Okayama upper limits
  40. GRB130603B: Swift/UVOT detection
  41. GRB 130604A: ISON-NM optical upper limit
  42. GRB 130603A: MITSuME Akeno Optical observation
  43. GRB 130604A: Swift detection of a burst
  44. GRB 130603A: SON optical observations
  45. GRB 130603B: Gemini Observations
  46. GRB 130603B: optical follow-up and independent GTC redshift determination and afterglow spectrum
  47. GRB 130603B: Magellan redshift confirmation
  48. GRB 130603B: Afterglow detection from NOT
  49. GRB 130603B: WHT optical afterglow candidate
  50. GRB 130603B: Enhanced Swift-XRT position
  51. Swift/UVOT observations of GRB130603A
  52. GRB 130603A: Enhanced Swift-XRT position
  53. GRB 130603B: Swift detection of a bright short burst
  54. GRB 130603A: MITSuME Okayama Optical Observation
  55. GRB 130603A: Swift-XRT observations
  56. GRB 130603A: Swift-XRT and Swift-UVOT detections
  57. GRB 130529A: GROND upper limits
  58. GRB 130529A: Swift/UVOT Upper Limits
  59. GRB 130529A: Enhanced Swift-XRT position
  60. GRB 130528A: Swift/UVOT Upper Limits
  61. GRB 130529A: Swift detection of a burst
  62. GRB 130527A: Swift/UVOT Upper Limits
  63. GRB 130528A: Enhanced Swift-XRT position
  64. GRB 130521A: Skynet/PROMPT detection of an extremely red afterglow
  65. GRB 130528A: optical upper limit
  66. GRB 130528A: Swift detection of a burst
  67. GRB 130527A: NOT optical counterpart
  68. GRB 130527A: RATIR Optical and NIR Observations
  69. GRB 130527A: Enhanced Swift-XRT position
  70. GRB 130527A: Swift detection of a bright burst
  71. Swift Trigger 556533 is not an astrophysical event
  72. Swift Trigger 556533 is probably not an astrophysical event
  73. GRB 130521A: Skynet/PROMPT observations
  74. GRB 130521A, Swift-BAT refined analysis
  75. GRB 130521A: TAROT La Silla observatory optical observations
  76. GRB 130427A / SN 2013cq: Hubble Space Telescope Observations
  77. GRB 130518A: Continued RATIR Optical Observations - Fading
  78. GRB 130518A: RATIR Optical and NIR Observations
  79. GRB 130518A: Swift XRT and UVOT possible afterglow
  80. VLT observations of GRB 130427A
  81. GRB 130427A: Konkoly optical observations
  82. GRB 130515A: IRSF NIR Observation
  83. GRB 130515A: Further Gemini Observations
  84. GRB 130515A: FORS2 spectroscopy of candidate counterpart
  85. GRB 130514B: RATIR Optical and NIR Observations
  86. GRB 130427A: Skynet detections of a possible supernova
  87. GRB 130515A: Swift-XRT refined Analysis
  88. GRB 130515A: Swift/UVOT Upper Limits
  89. GRB 130514B Swift-BAT observations
  90. GRB 130514B: GROND observations
  91. GRB 130515A: Gemini/GMOS Observations
  92. GRB 130515A: GROND Observations
  93. GRB 130515A: Enhanced Swift-XRT position
  94. GRB 130515A: VLT acquisition observation
  95. GRB 130511A: SSO 2.3m observation
  96. GRB 130514B: Swift-XRT Observations
  97. GRB 130515A: Swift detection of a short burst
  98. GRB 130514A: Skynet/PROMPT/DSO Detections
  99. GRB 130513A: Bassano Bresciano optical upper limit
  100. GRB 130514A: RATIR Optical and NIR Observations

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