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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"

12096 results found.

  1. GRB 070612B: Swift detection of a burst
  2. GRB 070610: OPTIMA-Burst detection of continued strong flaring activity
  3. GRB 070610: Watcher Observations
  4. GRB 070611: ROTSE-III Optical Limits
  5. GRB 070610: OPTIMA-Burst high-time-resolution optical observations
  6. GRB 070610, Swift-BAT refined analysis
  7. GRB 070610: Swift detection of a burst
  8. GRB 070419A, deep LBT photometry and possible supernova detection
  9. GRB070520B: optical observations
  10. GRB070520: optical observation
  11. GRB070518: optical observation
  12. GRB070521: optical observation
  13. Swift/UVOT refined analysis of GRB070531
  14. GRB 070531: Swift-BAT refined analysis
  15. GRB 070531: Swift detection of a burst
  16. Swift/UVOT refined analysis of GRB070529
  17. GRB 070529: MARGE Observations
  18. Konus-Wind observation of GRB 070521
  19. GROND upper limits of GRB 070521
  20. GRB 070520A: SARA upper limit
  21. GRB 070521: SARA upper limit
  22. GRB 070521: optical limit by Pi of the Sky
  23. GRB 070521: Swift detection of a burst
  24. GRB 070520: Xinglong EST optical Upper Limit
  25. GRB 070517: Swift detection of a burst
  26. GRB 070512: IPN localization and Konus spectrum of a bright burst
  27. GRB070419A: optical observations
  28. Konus-Wind and Konus-A observation of GRB 070508
  29. RHESSI Spectrum of GRB070508
  30. GRB 070508: Suzaku/WAM observation of the prompt emission
  31. GRB 070509: ROTSE-III Optical Limits
  32. GRB 070508, Swift-BAT refined analysis
  33. GRB 070508: Optical observation limiting magnitude
  34. GRB 070508: Optical afterglow detection
  35. GRB 070508: Swift detection of an intense burst with an optical counterpart
  36. GRB 070429A: Swift XRT refined analysis
  37. GRB 070429B: Swift XRT refined analysis
  38. GRB 070429B: ROTSE-III Optical Limits
  39. GRB 070429: ROTSE-III Optical Limits
  40. GRB 070427, Swift-BAT Refined Analysis
  41. GRB 070420, SMARTS optical/IR afterglow observations
  42. Konus-Wind observation of GRB 070420
  43. GRB070420: Swift UVOT continuing observations
  44. GRB 070420: NIR and optical afterglow confirmed
  45. GRB 070419A: Early Super-LOTIS Observations
  46. GRB 070419A: SARA observations
  47. GRB 070419B optical afterglow candidate
  48. GRB 070419B: optical afterglow candidate
  49. GRB 070419A: ROTSE-III Optical Limits
  50. GRB 070419: Swift detection of a burst
  51. GRB 070318, SMARTS optical/IR afterglow observations
  52. GRB 070411: Swift/UVOT observations
  53. GRB 070411: Optical photometry at Crni Vrh
  54. GRB 070411, Swift-BAT refined analysis
  55. GRB 070411 : Liverpool Telescope Observations
  56. GRB 070411: Optical observations at Crni Vrh
  57. GRB 070411: ROTSE-III Detection of Optical Counterpart
  58. GRB 070411: Tautenburg RRM Afterglow Confirmation
  59. GRB 070411: Swift detection of a burst with optical afterglow
  60. GRB 070406: Swift XRT team further analysis
  61. Suzaku ToO observation of SGR 1806-20
  62. GRB 070406: Gemini South Imaging and XRT analysis
  63. GRB 070406: SARA upper limit
  64. GRB 070406: Xinglong TNT optical Upper Limit
  65. Konus-Wind and Konus-A observations of GRB 070402
  66. IPN triangulation of GRB070402
  67. INTEGRAL ToO Observation of SGR1806-20
  68. Konus-Wind observation of GRB 070328
  69. long burst from SGR 1806-20 detected on March 26
  70. GRB 070328: Swift/XRT Refined Analysis
  71. GRB 070328 : Suzaku ToO follow up starts
  72. Short-Hard GRB 070209: PROMPT Observations
  73. GRB 070311: a long GRB detected by INTEGRAL
  74. GRB 070125: Chandra X-ray Confirmation of Jet Break
  75. GRB 070309: A long GRB detected by INTEGRAL
  76. GRB 070306: XRT Team Refined Analysis
  77. GRB 070227: optical observations
  78. GRB 070227: optical observations
  79. GRB 070224: SARA upper limit
  80. GRB 070224, Swift-BAT refined analysis
  81. GRB 070224: MASTER-Net refind analysis
  82. GRB 070224: MASTER-VWF-Kislovodsk observations
  83. GRB 070224: MASTER observations
  84. GRB 070224: Swift detection of a burst
  85. GRB 070223: Optical observations
  86. RHESSI Spectrum of GRB070220
  87. GRB 070223, Swift-BAT refined analysis
  88. Konus-Wind and Konus-A observations of GRB 070220
  89. GRB 070220: MITSuME Okayama Optical Observation
  90. GRB 070220: ART-3 Optical and NIR limits
  91. GRB 070220: Observation with the KANATA 1.5m telescope
  92. GRB070219: MASTER-VWF-Kislovodsk observations
  93. GRB 070219, Swift-BAT refined analysis
  94. GRB 070219: ROTSE-III Optical Limits
  95. GRB070219 - SDSS Pre-Burst Observations
  96. GRB 070201: clarification on localization and Konus-Wind spectra
  97. IPN localization of very bright long hard GRB 070207
  98. IPN localization of very intense short GRB 070201
  99. GRB 070208: ROTSE-III Optical Limits
  100. GRB 070125: further AAVSO optical observations

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