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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"

11131 results found.

  1. GRB 080229A: ROTSE-III Optical Limits
  2. GRB 080229: Swift detection of a bright burst
  3. GRB080207: optical observations
  4. Swift-XRT improved positions, and new redshift limits.
  5. GRB 080218B: GROND upper limits
  6. GRB 080218: Swift detection of a burst
  7. Konus-Wind observation of GRB 080211
  8. GRB080212: Optical afterglow candidate observed by MITSuME Telescope
  9. GRB 080212: GROND detects afterglow
  10. GRB 080212: Swift detection of a burst
  11. IPN localization of GRB 080211
  12. GRB 080210: GOND detection in all bands and redshift upper limit
  13. GRB 080205: GAO 150cm telescope Optical limit
  14. GRB 080207, Swift-BAT refined analysis
  15. Swift detection of AX J1749.1-2639
  16. GRB 080207, Swift-BAT refined analysis
  17. GRB080207: RTT150 Optical Observations
  18. GRB 080207: TAROT Calern observatory optical observations
  19. GRB 080207: Swift detection of a burst
  20. Konus-Wind observation of GRB 080204
  21. GRB 080205 optical upper limit
  22. GRB 080205: optical observation
  23. IPN localization of very hard GRB 080204
  24. GRB 080205: Swift XRT refined analysis
  25. GRB 080130: further Swift XRT observations confirm fading source
  26. GRB 080130?: Detection of a possible burst by BATSS
  27. GRB 080129: Swift-XRT refined analysis
  28. GRB 080129: KAIT optical limits
  29. GRB 080123: Early afterglow detection with BATSS (BAT Slew Survey)
  30. GRB 080129: optical limit by Pi of the Sky
  31. GRB 080129, Swift-BAT refined analysis
  32. A new website of high-level data products for Swift GRBs
  33. GRB 080121: Upper limit on X-ray afterglow
  34. Konus-Wind observation of GRB 080122
  35. SNe 2008D and 2007uy: Chandra Detections
  36. IPN triangulation of GRB080122
  37. GRB 080123, Swift-BAT refined analysis
  38. GRB 080120: Swift-XRT refined analysis
  39. GRB 080120: GROND detection
  40. GRB 080120 : Planned XMM-Newton observation
  41. GRB 080120: a long GRB detected by INTEGRAL
  42. Transient XRF 080109 / SN 2008D: Mount Abu NIR observations
  43. XRB 080109/SN 2008D: Early decline in brightness and change in colors
  44. XRB 080109/SN 2008D:PAIRITEL NIR observations and t_0 from Swift
  45. XRF 080109 in NGC2770: Detectable Superluminal Motion
  46. XRF in NGC 2770: Search for X-ray periodicity
  47. Bright X-ray Transient in NGC 2770 - A low-luminosity XRF?
  48. GRB 071227: Suzaku WAM observation of the prompt emission
  49. Konus-Wind observation of GRB 071227
  50. GRB 071227: Swift-XRT refined analysis
  51. GRB 071227: Swift detection of a burst
  52. GRB 071125: Suzaku WAM observation of the prompt emission
  53. Konus-Wind and Konus-A observations of GRB 071125
  54. IPN triangulation of very bright GRB 071125
  55. GRB071122: Swift/UVOT Observations
  56. GRB 071122: ROTSE-III Optical Limits
  57. GRB071118 MITSuME OAO optical observation
  58. GRB 071117: Swift-XRT revised position
  59. Konus-Wind and Konus-A observations of GRB 071117
  60. Swift/UVOT upper limits for GRB 071117
  61. GRB 071117: Gemini Optical Afterglow Discovery
  62. GRB 071118, Swift-BAT refined analysis
  63. GRB 071117: TAROT La Silla observatory optical observations
  64. GRB 071118: Swift detection of a burst
  65. GRB 071117: Gemini Observations
  66. GRB 071117: Swift-XRT refined analysis
  67. GRB 071117: Swift/XRT position
  68. GRB 071112C: Optical and NIR data observed with KANATA
  69. GRB071112C: Errata of MITSuME Ic band photometry
  70. GRB 071112C: optical observation
  71. GRB071112C MITSuME Okayama Optical Observation
  72. GRB 071112B: Magellan i-band imaging
  73. GRB071112C Xinglong_TNT_and_EST_afterglow observations
  74. GRB 071112B: ROTSE-III Rapid Optical Limits
  75. GRB 071112: Swift detection of a possible burst
  76. GRB 071109: IBIS refined analysis
  77. GRB 071109: BOOTES-2 prompt optical observations
  78. GRB 071109: A long GRB detected by INTEGRAL
  79. GRB 071104: Gamma Ray Burst Localization by SuperAGILE
  80. GRB 071101, Swift-BAT refined analysis
  81. GRB0711101: Two new source from Xinglong TNT observation
  82. GRB 071020: MITSuME Akeno optical observations
  83. GRB 071028: Swift detection of a burst
  84. GRB 071025: Kuiper Telescope Optical Observations
  85. GRB 071018: Revised BAT position
  86. GRB071020, optical upper limit
  87. GRB 071025: Swift-XRT Team refined analysis
  88. GRB 060602A: host redshift
  89. GRB 071025: Early Super-LOTIS Observations
  90. Optical observations of GRB 071020
  91. GRB071021: MITSuME Okayama Optical Upper Limits
  92. GRB 071010B: Fading quickly
  93. Konus-Wind observation of GRB 071020
  94. GRB 071020A: IR Imaging with PAIRITEL
  95. GRB071010b: optical observations
  96. GRB 071018, Swift-BAT refined analysis
  97. GRB 071010B: Suzaku WAM observation of the prompt emission
  98. GRB 071013: Optical observations
  99. GRB071013: optical limit
  100. GRB 20071013: Xinglong TNT optical Upper Limit

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