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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"

21000 results found.

  1. GRB 070406: Swift XRT refined analysis
  2. GRB 070318, SMARTS optical/IR afterglow observations
  3. GRB 070411: TLS data shows plateau, flares
  4. GRB070412: Swift UVOT observations
  5. GRB 070411: Swift/UVOT observations
  6. GRB 070412: Optical observations at Crni Vrh
  7. GRB 070412: further NOT observations
  8. GRB 070412: IAC80 optical afterglow candidate
  9. GRB 070411: Magellan/Clay photometry
  10. GRB 070411: Magellan/IMACS photometry
  11. GRB 070412: NOT observations
  12. GRB 070411: IAC80 optical observations
  13. GRB 070411 : Liverpool Telescope Observations
  14. GRB 070411: Optical observations at Crni Vrh
  15. GRB 070411: ROTSE-III Detection of Optical Counterpart
  16. GRB 070411: Tautenburg RRM Afterglow Confirmation
  17. GRB 070406: "Star" in XRT error circle S2 is an AGN?
  18. GRB 070406: Swift XRT team further analysis
  19. GRB 070406: Bright galaxy in XRT error circle is a quasar
  20. GRB 070406: Gemini South Imaging and XRT analysis
  21. GRB070406: Swift UVOT observations
  22. Short GRB 070406 - Possible Bright Host Galaxy
  23. GRB 070406: Swift XRT Team analysis - Possible X-ray counterpart
  24. GRB 070406: NOT observations
  25. GRB 070311, deep optical photometry
  26. Konus-Wind and Konus-A observations of GRB 070402
  27. INTEGRAL ToO Observation of SGR1806-20
  28. UVOT observations of GRB070330
  29. GRB 070330, SMARTS optical/IR observations
  30. GRB 070330: TAROT La Silla observatory optical observations
  31. GRB 070330 - Watcher Observations
  32. GRB070220: optical observations
  33. GRB070208: optical observations
  34. GRB070223: confirmation of nIR and optical afterglow
  35. GRB070318: Swift UVOT indicates unusual optical/UV afterglow
  36. GRB 070311, deep optical photometry
  37. Short-Hard GRB 070209: PROMPT Observations
  38. GRB 070318: Gemini + Magellan spectra
  39. GRB 070318: absorption-line redshift
  40. GRB070318: Swift UVOT continuing observations
  41. GRB 070318: Swift/UVOT Continued Observations
  42. GRB 070311: MDM Optical Monitoring
  43. GRB 070311: Tautenburg sees afterglow fading
  44. GRB 070311: Optical Brightening
  45. GRB 070306: possible emission-line redshift
  46. GRB 070311: SARA upper limit
  47. GRB 070309: variability of the XRT afterglow candidate
  48. GRB 070311: P60 Observations
  49. GRB 070311: MDM Optical Detection
  50. GRB 070311: REM candidate afterglow
  51. GRB060901: Candidate optical afterglow
  52. GRB070309: Swift/XRT possible afterglow detection
  53. GRB 070125: Chandra X-ray Confirmation of Jet Break
  54. GRB 070125: X-ray light curve analysis
  55. GRB 070306: NOT observations
  56. GRB070306: confirmation of near infrared afterglow
  57. GRB 070306: IR observations and candidate afterglow
  58. GRB 070306: Optical and IR observations with KANATA
  59. GRB070306 - SDSS Pre-burst Observations
  60. GRB 070223: NIR observations at WHT
  61. GRB070227: Swift-XRT refined analysis
  62. GRB 070227: optical observations
  63. GRB 070223: Optical Observations
  64. GRB 070227: optical observations
  65. GRB 070227: Swift/UVOT Upper Limits
  66. GRB 070227: TAROT La Silla observatory optical observations
  67. GRB070227: possible X-ray afterglow detection
  68. GRB 920925C: optical afterglow candidate
  69. GRB 070224: Swift/UVOT Upper Limits
  70. GRB070224: Magellan Imaging Observations
  71. GRB 070224: MDM Observations
  72. GRB070224: Gemini Imaging Observations
  73. GRB 070224: SARA upper limit
  74. GRB 070224: optical afterglow candidate
  75. GRB 070224: MASTER-VWF-Kislovodsk observations
  76. GRB 070224: MASTER observations
  77. GRB 070223: Optical observations
  78. GRB070223: Swift/UVOT refined analysis
  79. GRB070223: MASTER-VWF-Kislovodsk observations
  80. GRB070223 - SDSS Pre-Burst Observations
  81. GRB 070223: Liverpool Telescope Possible Afterglow Candidate
  82. GRB 070223: MDM Observations
  83. Konus-Wind and Konus-A observations of GRB 070220
  84. Swift/UVOT refined analysis of GRB070220
  85. GRB 070219: Gemini Observations
  86. GRB 070220 : Faulkes Telescope North optical limit
  87. GRB070219: MASTER-VWF-Kislovodsk observations
  88. GRB 070219: Swift/UVOT Upper limits
  89. GRB 070219: I-band observations
  90. GRB 070219: optical TNG observations
  91. GRB 070219: Liverpool Telescope Observations
  92. GRB070219 - SDSS Pre-Burst Observations
  93. GRB 070125 observations with the GMRT
  94. GRB 060927: PROMPT Observations
  95. GRB 070125: Break in Optical Decay
  96. GRB070208: optical observations
  97. GRB 070208: MARGE Optical Observations
  98. GRB070208 - SDSS Pre-Burst Observations
  99. GRB070208: Faulkes Telescope North Afterglow Identification
  100. GRB 070208: MDM Observations

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