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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"

20548 results found.

  1. GRB 130612A: Zadko observatory - Gingin optical observations
  2. GRB 130612A: Enhanced Swift-XRT position
  3. GRB 130612A: TAROT La Silla observatory optical observations
  4. GRB130612A OSN I-band observations
  5. GRB 130612A: RATIR Optical Observations
  6. GRB 130612A: P60 Observations
  7. GRB 130612A: Skynet/PROMPT detection of the optical afterglow
  8. GRB 130612A: PAIRITEL NIR Afterglow Observations
  9. GRB 130612A: Swift detection of a burst with an optical counterpart
  10. GRB 130609A: Swift/UVOT Upper Limits
  11. GRB 130608A: Swift/UVOT Upper Limits
  12. GRB 130609B: GROND observations
  13. GRB 130606A: CrAO optical upper limit
  14. GRB 130609B, Swift-BAT refined analysis
  15. GRB 130608A: ISON-Kislovodsk optical upper limit
  16. GRB 130610A: ISON-NM optical observations
  17. GRB 130610A: Swift/UVOT Observations
  18. GRB 130609B: Swift/UVOT Observations
  19. GRB 130606B: Swift/UVOT Upper Limit
  20. GRB 130610A: LOAO BVR Observation
  21. GRB 130610A: Enhanced Swift-XRT position
  22. GRB 130608A: Further Swift-BAT analysis
  23. GRB 130609B: Enhanced Swift-XRT position
  24. GRB 130610A: P60 Observations
  25. GRB 130610A: PAIRITEL NIR Afterglow Observations
  26. GRB 130610A: Skynet/PROMPT detection of the optical afterglow
  27. GRB 130610A: Swift detection of a burst with an optical counterpart
  28. GRB 130609B: Swift detection of a burst with an optical counterpart
  29. GRB 130608A: RATIR Optical and NIR Observations
  30. GRB 130609A: Enhanced Swift-XRT position
  31. GRB 130608A: Enhanced Swift-XRT position
  32. GRB 130609A: RATIR Optical and NIR Observations
  33. GRB 130609A: P60 nondetection
  34. GRB130608A: BOOTES-2/TELMA upper limits
  35. GRB 130609A: Swift detection of a burst
  36. GRB 130608A: Swift detection of a burst
  37. GRB 130606A: Continued Skynet/PROMPT observations
  38. GRB 130606A: Continued RATIR Optical and NIR Monitoring
  39. GRB 130606B: RATIR Optical and NIR Observations
  40. GRB 130606B: Swift-XRT observations
  41. GRB 130606A: TAROT Calern observatory early optical observations
  42. GRB 130606A: Skynet/PROMPT detection of the optical afterglow
  43. GRB 130606A: Swift/UVOT Upper Limits
  44. GRB 130603A: AAO optical observations
  45. GRB 130606A: Enhanced Swift-XRT position
  46. GRB 130606A: GROND Detection of the Optical/NIR Afterglow
  47. GRB 130606A: AAO optical observations
  48. GRB 130606A: P60 Observations
  49. Konus-Wind observation of GRB 130606B
  50. GRB 130606A: PAIRITEL NIR Afterglow Observations
  51. GRB 130606A: RATIR r'-band Dropout
  52. GRB 130606A:T100 observations
  53. GRB 130606B: Fermi-LAT detection of a bright hard burst
  54. GRB130606A: Montarrenti Observatory afterglow detection
  55. Virtual Telescope observations of GRB 130606A
  56. GRB 130605A: Swift-XRT refined Analysis
  57. GRB 130606A - Liverpool Telescope Optical Afterglow Confirmation
  58. GRB 130606A: IRSF NIR Observation
  59. GRB 130606A: NOT afterglow detection
  60. GRB 130606A: Swift detection of a burst
  61. GRB 130605A: Swift/UVOT Detection
  62. GRB 130605A: Continued Skynet/PROMPT observations
  63. GRB 130605A: Skynet/PROMPT detection of a fading afterglow
  64. GRB 130605A: TAROT La Silla observatory optical detection of the afterglow
  65. GRB 130605A: GROND afterglow candidate
  66. GRB 130605A: Swift detection of a burst
  67. Konus-Wind observation of GRB 130603B
  68. GRB 130603B: AMI-LA 15GHz observations
  69. GRB 130604A: Swift/UVOT Upper Limits
  70. Swift Trigger 557466 is probably not real.
  71. GRB 130604B: Fermi GBM detection
  72. GRB 130603B: RATIR Optical and NIR Observations
  73. GRB 130604A: Enhanced Swift-XRT position
  74. GRB 130604A: Gemini North Spectroscopy
  75. GRB 130603B: P60 Observations
  76. GRB 130604A: MITSuME Okayama upper limits
  77. GRB130603B: Swift/UVOT detection
  78. GRB 130604A: ISON-NM optical upper limit
  79. GRB 130603A: MITSuME Akeno Optical observation
  80. GRB 130604A: Swift detection of a burst
  81. GRB 130603A: SON optical observations
  82. GRB 130603B: Gemini Observations
  83. GRB 130603B: Magellan redshift confirmation
  84. GRB 130603B: Afterglow detection from NOT
  85. GRB 130603B: WHT optical afterglow candidate
  86. GRB 130603B: Enhanced Swift-XRT position
  87. Swift/UVOT observations of GRB130603A
  88. GRB 130603A: Enhanced Swift-XRT position
  89. GRB 130603B: Swift detection of a bright short burst
  90. GRB 130603A: MITSuME Okayama Optical Observation
  91. GRB 130603A: Swift-XRT observations
  92. GRB 130603A: Swift-XRT and Swift-UVOT detections
  93. GRB 130529A: GROND upper limits
  94. GRB 130529A: Swift/UVOT Upper Limits
  95. GRB 130529A: Enhanced Swift-XRT position
  96. GRB 130528A: Swift/UVOT Upper Limits
  97. Konus-Wind observation of GRB 130527A
  98. GRB 130528A: Swift-BAT refined analysis
  99. GRB 130529A: Swift detection of a burst
  100. GRB 130527A: Swift/UVOT Upper Limits

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