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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"

12095 results found.

  1. GRB080307, optical upper limit
  2. GRB080229, optical upper limit
  3. GRB080307: Optical upper limits
  4. GRB 080307, Preliminary Swift-BAT refined analysis
  5. GRB 080303, Swift-BAT refined analysis
  6. GRB 080303A: ROTSE-III Optical Limits
  7. GRB 080229B: Gamma Ray Burst Localization by SuperAGILE
  8. GRB 080229A: ROTSE-III Optical Limits
  9. GRB 080229: Swift detection of a bright burst
  10. GRB080207: optical observations
  11. Swift-XRT improved positions, and new redshift limits.
  12. GRB 080218B: GROND upper limits
  13. GRB 080218: Swift detection of a burst
  14. Konus-Wind observation of GRB 080211
  15. GRB080212: Optical afterglow candidate observed by MITSuME Telescope
  16. GRB 080212: GROND detects afterglow
  17. GRB 080212: Swift detection of a burst
  18. IPN localization of GRB 080211
  19. GRB 080210: GOND detection in all bands and redshift upper limit
  20. GRB 080205: GAO 150cm telescope Optical limit
  21. GRB 080207, Swift-BAT refined analysis
  22. Swift detection of AX J1749.1-2639
  23. GRB 080207, Swift-BAT refined analysis
  24. GRB080207: RTT150 Optical Observations
  25. GRB 080207: TAROT Calern observatory optical observations
  26. GRB 080207: Swift detection of a burst
  27. Konus-Wind observation of GRB 080204
  28. GRB 080205 optical upper limit
  29. GRB 080205: optical observation
  30. IPN localization of very hard GRB 080204
  31. GRB 080205: Swift XRT refined analysis
  32. GRB 080130: further Swift XRT observations confirm fading source
  33. GRB 080130?: Detection of a possible burst by BATSS
  34. GRB 080129: Swift-XRT refined analysis
  35. GRB 080129: KAIT optical limits
  36. GRB 080123: Early afterglow detection with BATSS (BAT Slew Survey)
  37. GRB 080129: optical limit by Pi of the Sky
  38. GRB 080129, Swift-BAT refined analysis
  39. A new website of high-level data products for Swift GRBs
  40. GRB 080121: Upper limit on X-ray afterglow
  41. Konus-Wind observation of GRB 080122
  42. SNe 2008D and 2007uy: Chandra Detections
  43. IPN triangulation of GRB080122
  44. GRB 080123, Swift-BAT refined analysis
  45. GRB 080120: Swift-XRT refined analysis
  46. GRB 080120: GROND detection
  47. GRB 080120 : Planned XMM-Newton observation
  48. GRB 080120: a long GRB detected by INTEGRAL
  49. Transient XRF 080109 / SN 2008D: Mount Abu NIR observations
  50. XRB 080109/SN 2008D: Early decline in brightness and change in colors
  51. XRB 080109/SN 2008D:PAIRITEL NIR observations and t_0 from Swift
  52. XRF 080109 in NGC2770: Detectable Superluminal Motion
  53. XRF in NGC 2770: Search for X-ray periodicity
  54. Bright X-ray Transient in NGC 2770 - A low-luminosity XRF?
  55. GRB 071227: Suzaku WAM observation of the prompt emission
  56. Konus-Wind observation of GRB 071227
  57. GRB 071227: Swift-XRT refined analysis
  58. GRB 071227: Swift detection of a burst
  59. GRB 071125: Suzaku WAM observation of the prompt emission
  60. Konus-Wind and Konus-A observations of GRB 071125
  61. IPN triangulation of very bright GRB 071125
  62. Disregard the "GRB 071126" position
  63. GRB071122: Swift/UVOT Observations
  64. GRB 071122: ROTSE-III Optical Limits
  65. GRB071118 MITSuME OAO optical observation
  66. GRB 071117: Swift-XRT revised position
  67. Konus-Wind and Konus-A observations of GRB 071117
  68. Swift/UVOT upper limits for GRB 071117
  69. GRB 071117: Gemini Optical Afterglow Discovery
  70. GRB 071118, Swift-BAT refined analysis
  71. GRB 071117: TAROT La Silla observatory optical observations
  72. GRB 071118: Swift detection of a burst
  73. GRB 071117: Gemini Observations
  74. GRB 071117: Swift-XRT refined analysis
  75. GRB 071117: Swift/XRT position
  76. GRB 071112C: Optical and NIR data observed with KANATA
  77. GRB071112C: Errata of MITSuME Ic band photometry
  78. GRB 071112C: optical observation
  79. GRB071112C MITSuME Okayama Optical Observation
  80. GRB 071112B: Magellan i-band imaging
  81. GRB071112C Xinglong_TNT_and_EST_afterglow observations
  82. GRB 071112B: ROTSE-III Rapid Optical Limits
  83. GRB 071112: Swift detection of a possible burst
  84. GRB 071109: IBIS refined analysis
  85. GRB 071109: BOOTES-2 prompt optical observations
  86. GRB 071109: A long GRB detected by INTEGRAL
  87. GRB 071104: Gamma Ray Burst Localization by SuperAGILE
  88. GRB 071101, Swift-BAT refined analysis
  89. GRB0711101: Two new source from Xinglong TNT observation
  90. GRB 071020: MITSuME Akeno optical observations
  91. GRB 071028: Swift detection of a burst
  92. GRB 071025: Kuiper Telescope Optical Observations
  93. GRB 071018: Revised BAT position
  94. GRB071020, optical upper limit
  95. GRB 071025: Swift-XRT Team refined analysis
  96. GRB 060602A: host redshift
  97. GRB 071025: Early Super-LOTIS Observations
  98. Optical observations of GRB 071020
  99. GRB071021: MITSuME Okayama Optical Upper Limits
  100. GRB 071010B: Fading quickly

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