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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"

11404 results found.

  1. GRB 071025: Kuiper Telescope Optical Observations
  2. GRB 071018: Revised BAT position
  3. GRB071020, optical upper limit
  4. GRB 071025: Swift-XRT Team refined analysis
  5. GRB 060602A: host redshift
  6. GRB 071025: Early Super-LOTIS Observations
  7. Optical observations of GRB 071020
  8. GRB071021: MITSuME Okayama Optical Upper Limits
  9. GRB 071010B: Fading quickly
  10. Konus-Wind observation of GRB 071020
  11. GRB 071020A: IR Imaging with PAIRITEL
  12. GRB071010b: optical observations
  13. GRB 071018, Swift-BAT refined analysis
  14. GRB 071010B: Suzaku WAM observation of the prompt emission
  15. GRB 071017: a SHORT GRB detected by INTEGRAL
  16. GRB 071013: Optical observations
  17. GRB071013: optical limit
  18. GRB 20071013: Xinglong TNT optical Upper Limit
  19. GRB 071010C Swift-BAT detection of a burst
  20. GRB 071011: MARGE Optical Limits
  21. GRB 071010B: Gemini Spectroscopic Observations
  22. Optical Observation: GRB 071010
  23. Optical observations: GRB 071010A
  24. Konus-Wind observation of GRB 071010B
  25. GRB071010B: Swift/XRT detection
  26. GRB 071010B, Swift-BAT refined analysis
  27. GRB071008: optical observations
  28. GRB 071010B: Swift detection of a burst
  29. GRB 071010, Swift-BAT refined analysis
  30. Konus-Wind observation of GRB 071006
  31. GRB071008: Swift-XRT observation
  32. GRB 071010: Keck Observations of the Afterglow
  33. GRB 071008: Swift detection of a burst
  34. GRB 070810B: further XRT analysis
  35. Konus-Wind observation of GRB 071003
  36. GRB 071003: Possible rebrightening
  37. GRB 071003: KAIT optical afterglow observations
  38. GRB 071001, Swift-BAT refined analysis
  39. Disregard the Swift-XRT Notices today
  40. GRB 070920B: ROTSE-III Early Optical Limits
  41. GRB 070925: a long GRB detected by INTEGRAL
  42. Recent SGR1806-20 Activity
  43. INTEGRAL ToO observations of SGR1806-20
  44. GRB 070920B, Swift-BAT refined analysis
  45. SGR1806-20: Swift-BAT detection of enhanced activity
  46. Konus-Wind observation of GRB 070917
  47. GRB 070917: KAIT optical limits
  48. GRB 070911: Suzaku WAM observation of the prompt emission
  49. GRB 070913: Swift detection of a burst
  50. IPN search for a GRB associated with TAROT transient on August 31
  51. Intense burst from SGR 1806-20 detected on September 7
  52. GRB 070809: Confirmation of optical transient
  53. Orphan GRB candidate in IC 4779 at TAROT La Silla observatory
  54. Konus-Wind observation of GRB 070824
  55. GRB 070824 - Combined SuperAGILE/IPN Localization
  56. Konus-Wind observation of very bright GRB 070821
  57. IPN Localization of GRB 070821 (long, very bright)
  58. GRB 070810B: Xinglong TNT optical Upper Limit
  59. GRB 070809: Swift/UVOT Upper Limits
  60. GRB 070810B: Swift detection of a short burst
  61. GRB 070810: Swift detection of a burst
  62. GRB 070809: ROTSE-III Optical Limits
  63. GRB 070808: Swift XRT refined analysis
  64. GRB 070808: ROTSE-III Optical Limits
  65. GRB070805 XRT and UVOT afterglow candidate
  66. GRB 070805: Swift XRT initial analysis.
  67. Swift detection of a outburst from SAX J1810.8-2609
  68. GRB 070802, Swift-BAT refined analysis
  69. GRB 070802: GROND J band candidate
  70. Konus-A observation of GRB 070729
  71. AGILE-ACS position for the SGR 1806-20 July 27 burst
  72. Intense burst from SGR 1806-20 detected on July 27
  73. Konus-Wind observation of GRB 070724B
  74. GRB 070724B: Analysis of AGILE gamma-ray data
  75. GRB 070724b: First Gamma Ray Burst Localization by SuperAGILE onboard
  76. GRB 060814 - Keck host detection and redshift
  77. Short-Hard GRB070714B: PROMPT Observations
  78. GRB 070326: Detection of first burst from BAT Slew Survey (BATSS)
  79. GRB 070721B, Swift-BAT refined analysis
  80. GRB 070714B : Suzaku WAM observation of the prompt emission
  81. GRB 070714A: Swift-BAT T_zero
  82. GRB 070616: No Evidence for I Band Afterglow
  83. GRB 070714B, Swift-BAT refined analysis of the short hard burst
  84. SN 2007bg - off-axis GRB?
  85. GRB 070704: RTT150 optical observations
  86. GRB 070704: Suzaku/WAM observation of the prompt emission
  87. Konus-Wind observation of GRB 070707
  88. GRB 070707: VLT observations
  89. GRB070704: FAVOR optical observations
  90. Konus-Wind observation of GRB 070626
  91. Swift/UVOT Observations of GRB070704
  92. GRB 070704: Correction to GCN Circ 6594
  93. GRB 070704: Swift detection of a burst
  94. GRB 070626: IPN localization and Konus spectrum of a bright long burst
  95. GRB 070628, Swift-BAT refined analysis
  96. GRB 070628: Watcher Observations
  97. Swift UVOT Observations of GRB 070628
  98. GRB 070628: Swift detection of a possible burst
  99. GRB 070612A: Second Epoch WSRT Radio Observations
  100. GRB 070621: Swift-BAT refined analysis

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