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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"

11504 results found.

  1. Konus-Wind observation of GRB 070917
  2. GRB 070917: KAIT optical limits
  3. GRB 070911: Suzaku WAM observation of the prompt emission
  4. GRB 070913: Swift detection of a burst
  5. IPN search for a GRB associated with TAROT transient on August 31
  6. Intense burst from SGR 1806-20 detected on September 7
  7. GRB 070809: Confirmation of optical transient
  8. Orphan GRB candidate in IC 4779 at TAROT La Silla observatory
  9. Konus-Wind observation of GRB 070824
  10. GRB 070824 - Combined SuperAGILE/IPN Localization
  11. Konus-Wind observation of very bright GRB 070821
  12. IPN Localization of GRB 070821 (long, very bright)
  13. GRB 070810B: Xinglong TNT optical Upper Limit
  14. GRB 070809: Swift/UVOT Upper Limits
  15. GRB 070810B: Swift detection of a short burst
  16. GRB 070810: Swift detection of a burst
  17. GRB 070809: ROTSE-III Optical Limits
  18. GRB 070808: Swift XRT refined analysis
  19. GRB 070808: ROTSE-III Optical Limits
  20. GRB070805 XRT and UVOT afterglow candidate
  21. GRB 070805: Swift XRT initial analysis.
  22. GRB 070802, Swift-BAT refined analysis
  23. GRB 070802: GROND J band candidate
  24. Konus-A observation of GRB 070729
  25. AGILE-ACS position for the SGR 1806-20 July 27 burst
  26. Intense burst from SGR 1806-20 detected on July 27
  27. Konus-Wind observation of GRB 070724B
  28. GRB 070724B: Analysis of AGILE gamma-ray data
  29. GRB 070724b: First Gamma Ray Burst Localization by SuperAGILE onboard
  30. GRB 060814 - Keck host detection and redshift
  31. Short-Hard GRB070714B: PROMPT Observations
  32. GRB 070326: Detection of first burst from BAT Slew Survey (BATSS)
  33. GRB 070721B, Swift-BAT refined analysis
  34. GRB 070714B : Suzaku WAM observation of the prompt emission
  35. GRB 070714A: Swift-BAT T_zero
  36. GRB 070616: No Evidence for I Band Afterglow
  37. GRB 070714B, Swift-BAT refined analysis of the short hard burst
  38. SN 2007bg - off-axis GRB?
  39. GRB 070704: RTT150 optical observations
  40. GRB 070704: Suzaku/WAM observation of the prompt emission
  41. Konus-Wind observation of GRB 070707
  42. GRB 070707: VLT observations
  43. GRB070704: FAVOR optical observations
  44. Konus-Wind observation of GRB 070626
  45. Swift/UVOT Observations of GRB070704
  46. GRB 070704: Correction to GCN Circ 6594
  47. GRB 070704: Swift detection of a burst
  48. GRB 070626: IPN localization and Konus spectrum of a bright long burst
  49. GRB 070628, Swift-BAT refined analysis
  50. GRB 070628: Watcher Observations
  51. Swift UVOT Observations of GRB 070628
  52. GRB 070628: Swift detection of a possible burst
  53. GRB 070612A: Second Epoch WSRT Radio Observations
  54. GRB 070621: Swift-BAT refined analysis
  55. GRB 070621: ROTSE-III Prompt Optical Limits
  56. GRB 070621: Swift detection of a burst
  57. Swift/UVOT observations of GRB070616
  58. GRB 070615: A long GRB detected by INTEGRAL
  59. SWIFT J195509.6+261406 (GRB 070610): further observations
  60. SWIFT J195509.6+261406 / GRB 070610: OPTIMA-Burst observations
  61. GRB 070612A, Swift-BAT refined analysis
  62. GRB 070612A: SARA detection of possible OT
  63. GRB 070612B: Swift detection of a burst
  64. GRB 070610: OPTIMA-Burst detection of continued strong flaring activity
  65. GRB 070610: Watcher Observations
  66. GRB 070611: ROTSE-III Optical Limits
  67. GRB 070610: OPTIMA-Burst high-time-resolution optical observations
  68. GRB 070610, Swift-BAT refined analysis
  69. GRB 070610: Swift detection of a burst
  70. GRB 070419A, deep LBT photometry and possible supernova detection
  71. GRB070520B: optical observations
  72. GRB070520: optical observation
  73. GRB070518: optical observation
  74. GRB070521: optical observation
  75. Swift/UVOT refined analysis of GRB070531
  76. GRB 070531: Swift-BAT refined analysis
  77. GRB 070531: Swift detection of a burst
  78. Swift/UVOT refined analysis of GRB070529
  79. GRB 070529: MARGE Observations
  80. Konus-Wind observation of GRB 070521
  81. GROND upper limits of GRB 070521
  82. GRB 070520A: SARA upper limit
  83. GRB 070521: SARA upper limit
  84. GRB 070521: optical limit by Pi of the Sky
  85. GRB 070521: Swift detection of a burst
  86. GRB 070520: Xinglong EST optical Upper Limit
  87. GRB 070517: Swift detection of a burst
  88. GRB 070512: IPN localization and Konus spectrum of a bright burst
  89. GRB070419A: optical observations
  90. Konus-Wind and Konus-A observation of GRB 070508
  91. RHESSI Spectrum of GRB070508
  92. GRB 070508: Suzaku/WAM observation of the prompt emission
  93. GRB 070509: ROTSE-III Optical Limits
  94. GRB 070508, Swift-BAT refined analysis
  95. GRB 070508: Optical observation limiting magnitude
  96. GRB 070508: Optical afterglow detection
  97. GRB 070508: Swift detection of an intense burst with an optical counterpart
  98. GRB 070429A: Swift XRT refined analysis
  99. GRB 070429B: Swift XRT refined analysis
  100. GRB 070429B: ROTSE-III Optical Limits

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