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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"

11503 results found.

  1. GRB 080123: Early afterglow detection with BATSS (BAT Slew Survey)
  2. GRB 080129: optical limit by Pi of the Sky
  3. GRB 080129, Swift-BAT refined analysis
  4. A new website of high-level data products for Swift GRBs
  5. GRB 080121: Upper limit on X-ray afterglow
  6. Konus-Wind observation of GRB 080122
  7. SNe 2008D and 2007uy: Chandra Detections
  8. IPN triangulation of GRB080122
  9. GRB 080123, Swift-BAT refined analysis
  10. GRB 080120: Swift-XRT refined analysis
  11. GRB 080120: GROND detection
  12. GRB 080120 : Planned XMM-Newton observation
  13. GRB 080120: a long GRB detected by INTEGRAL
  14. Transient XRF 080109 / SN 2008D: Mount Abu NIR observations
  15. XRB 080109/SN 2008D: Early decline in brightness and change in colors
  16. XRB 080109/SN 2008D:PAIRITEL NIR observations and t_0 from Swift
  17. XRF 080109 in NGC2770: Detectable Superluminal Motion
  18. XRF in NGC 2770: Search for X-ray periodicity
  19. Bright X-ray Transient in NGC 2770 - A low-luminosity XRF?
  20. GRB 071227: Suzaku WAM observation of the prompt emission
  21. Konus-Wind observation of GRB 071227
  22. GRB 071227: Swift-XRT refined analysis
  23. GRB 071227: Swift detection of a burst
  24. GRB 071125: Suzaku WAM observation of the prompt emission
  25. Konus-Wind and Konus-A observations of GRB 071125
  26. IPN triangulation of very bright GRB 071125
  27. GRB071122: Swift/UVOT Observations
  28. GRB 071122: ROTSE-III Optical Limits
  29. GRB071118 MITSuME OAO optical observation
  30. GRB 071117: Swift-XRT revised position
  31. Konus-Wind and Konus-A observations of GRB 071117
  32. Swift/UVOT upper limits for GRB 071117
  33. GRB 071117: Gemini Optical Afterglow Discovery
  34. GRB 071118, Swift-BAT refined analysis
  35. GRB 071117: TAROT La Silla observatory optical observations
  36. GRB 071118: Swift detection of a burst
  37. GRB 071117: Gemini Observations
  38. GRB 071117: Swift-XRT refined analysis
  39. GRB 071117: Swift/XRT position
  40. GRB 071112C: Optical and NIR data observed with KANATA
  41. GRB071112C: Errata of MITSuME Ic band photometry
  42. GRB 071112C: optical observation
  43. GRB071112C MITSuME Okayama Optical Observation
  44. GRB 071112B: Magellan i-band imaging
  45. GRB071112C Xinglong_TNT_and_EST_afterglow observations
  46. GRB 071112B: ROTSE-III Rapid Optical Limits
  47. GRB 071112: Swift detection of a possible burst
  48. GRB 071109: IBIS refined analysis
  49. GRB 071109: BOOTES-2 prompt optical observations
  50. GRB 071109: A long GRB detected by INTEGRAL
  51. GRB 071104: Gamma Ray Burst Localization by SuperAGILE
  52. GRB 071101, Swift-BAT refined analysis
  53. GRB0711101: Two new source from Xinglong TNT observation
  54. GRB 071020: MITSuME Akeno optical observations
  55. GRB 071028: Swift detection of a burst
  56. GRB 071025: Kuiper Telescope Optical Observations
  57. GRB 071018: Revised BAT position
  58. GRB071020, optical upper limit
  59. GRB 071025: Swift-XRT Team refined analysis
  60. GRB 060602A: host redshift
  61. GRB 071025: Early Super-LOTIS Observations
  62. Optical observations of GRB 071020
  63. GRB071021: MITSuME Okayama Optical Upper Limits
  64. GRB 071010B: Fading quickly
  65. Konus-Wind observation of GRB 071020
  66. GRB 071020A: IR Imaging with PAIRITEL
  67. GRB071010b: optical observations
  68. GRB 071018, Swift-BAT refined analysis
  69. GRB 071010B: Suzaku WAM observation of the prompt emission
  70. GRB 071013: Optical observations
  71. GRB071013: optical limit
  72. GRB 20071013: Xinglong TNT optical Upper Limit
  73. GRB 071010C Swift-BAT detection of a burst
  74. GRB 071011: MARGE Optical Limits
  75. GRB 071010B: Gemini Spectroscopic Observations
  76. Optical Observation: GRB 071010
  77. Optical observations: GRB 071010A
  78. Konus-Wind observation of GRB 071010B
  79. GRB071010B: Swift/XRT detection
  80. GRB 071010B, Swift-BAT refined analysis
  81. GRB071008: optical observations
  82. GRB 071010B: Swift detection of a burst
  83. GRB 071010, Swift-BAT refined analysis
  84. Konus-Wind observation of GRB 071006
  85. GRB071008: Swift-XRT observation
  86. GRB 071010: Keck Observations of the Afterglow
  87. GRB 071008: Swift detection of a burst
  88. GRB 070810B: further XRT analysis
  89. Konus-Wind observation of GRB 071003
  90. GRB 071003: Possible rebrightening
  91. GRB 071003: KAIT optical afterglow observations
  92. GRB 071001, Swift-BAT refined analysis
  93. Disregard the Swift-XRT Notices today
  94. GRB 070920B: ROTSE-III Early Optical Limits
  95. GRB 070925: a long GRB detected by INTEGRAL
  96. Recent SGR1806-20 Activity
  97. INTEGRAL ToO observations of SGR1806-20
  98. GRB 070920B, Swift-BAT refined analysis
  99. SGR1806-20: Swift-BAT detection of enhanced activity
  100. Konus-Wind observation of GRB 070917

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