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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"

27394 results found.

  1. GRB 080310: Swift-XRT refined analysis
  2. GRB 080310: Swift/UVOT Refined Analysis
  3. GRB 080310 - SDSS Pre-Burst Observations
  4. GRB 080310: Enhanced Swift-XRT position
  5. GRB 080310: RRM optical photometry with the VLT
  6. GRB080310, optical observations with LBT
  7. GRB 080310: REM observations
  8. GRB 080310: Swift detection of a burst with optical afterglow
  9. GRB080307, optical upper limit
  10. GRB080229, optical upper limit
  11. GRB 080307: Swift-XRT Team refined analysis
  12. GRB 080307: Swift/UVOT Upper Limits
  13. GRB 080307, Swift-BAT refined analysis
  14. GRB080307 - SDSS Pre-Burst Observations
  15. GRB 080307: TNT optical observation
  16. GRB080307: Optical upper limits
  17. GRB 080307: Gemini-N i-band observations - candidate afterglow
  18. GRB 080307: retraction of UVOT candidate
  19. GRB 080307: Enhanced Swift-XRT position
  20. GRB 080307, Preliminary Swift-BAT refined analysis
  21. GRB 080307: Optical observation with DMC/KANATA
  22. GRB 080307: Swift detection of a burst
  23. VLA possible radio detection of GRB 080229
  24. GRB 080303, Swift-BAT refined analysis
  25. GRB080303: Swift XRT refined analysis
  26. GRB 080303: Enhanced Swift-XRT position
  27. Swift UVOT observations of GRB080229B
  28. GRB080229B: Swift XRT afterglow observation
  29. GRB 080303: Swift detection of a burst with optical afterglow
  30. GRB 080303: REM NIR afterglow candidate
  31. GRB 080303A: ROTSE-III Optical Limits
  32. GRB 080229: I-band observations from OSN
  33. GRB 080229: VLT NIR observations
  34. GRB080229: Swift XRT refined analysis
  35. GRB 080229: TNG NIR observations
  36. GRB 080229: Enhanced Swift-XRT position
  37. GRB 080229: REM NIR observations
  38. GRB080229: Possible optical afterglow
  39. GRB 080229B: Gamma Ray Burst Localization by SuperAGILE
  40. UVOT analysis for GRB080229
  41. GRB 080229, Swift-BAT refined analysis
  42. GRB 080229A: ROTSE-III Optical Limits
  43. GRB 080229: Swift detection of a bright burst
  44. XRF 080109/SN2008D : GMRT upper limit at 1.28 GHz
  45. Swift-XRT improved positions, and new redshift limits.
  46. ESO optical and NIR observations of GRB 080218B
  47. GRB 080204: Suzaku WAM observation of the prompt emission
  48. GRB 080218B, Swift-BAT refined analysis
  49. GRB 080218B: Swift-XRT refined analysis
  50. Swift/UVOT observations of GRB080218B
  51. GRB 080218B: REM NIR early upper limits
  52. GRB 080218B: Enhanced Swift-XRT position
  53. GRB 080218B: GROND upper limits
  54. GRB 080218A, Swift-BAT refined analysis
  55. GRB 080211: Suzaku WAM observation of the prompt emission
  56. Swift-XRT and UVOT observations of the IPN burst GRB 080211
  57. VLA radio upper limit on GRB 080212
  58. Swift/UVOT refined analysis of GRB080212
  59. GRB 080212, Swift-BAT refined analysis
  60. GRB080212: Optical afterglow candidate observed by MITSuME Telescope
  61. GRB 080212: GROND detects afterglow
  62. GRB 080212: REM NIR afterglow?
  63. GRB 080212: Enhanced Swift-XRT position
  64. GRB 080212: Swift-XRT Team refined analysis
  65. GRB 080210: Keck photometry
  66. VLA non-detection of GRB 080210
  67. GRB 080212: Swift detection of a burst
  68. GRB 080207: VLT NIR early upper limits
  69. GRB 080210: Swift/UVOT Refined Analysis
  70. GRB 080210, Swift-BAT refined analysis
  71. GRB 080210: Super-LOTIS observations
  72. GRB 080210: Swift-XRT Refined Analysis
  73. GRB 080210: Enhanced Swift-XRT position
  74. GRB 080210: GOND detection in all bands and redshift upper limit
  75. GRB080210 - SDSS Pre-Burst Observations
  76. GRB 080210: Swift detection of a burst with optical afterglow
  77. GRB 080210: TAROT La Silla observatory optical detection
  78. GRB 080207: GROND upper limits
  79. GRB 080205: GAO 150cm telescope Optical limit
  80. GRB 080207, Swift-BAT refined analysis
  81. GRB 080207: Optical limits from Gemini-South
  82. Swift detection of AX J1749.1-2639
  83. GRB 080207: Super-LOTIS observations
  84. GRB 080207, Swift-BAT refined analysis
  85. Swift Trigger 302777 is not a GRB
  86. GRB080207: RTT150 Optical Observations
  87. GRB 080207: REM NIR observations
  88. GRB080207: Swift/UVOT refined analysis
  89. GRB 080207: TAROT Calern observatory optical observations
  90. GRB 080207: Swift-XRT Refined Analysis
  91. GRB 080207: Enhanced Swift-XRT position
  92. GRB 080207: Swift detection of a burst
  93. GRB 080205: optical observation
  94. VLA radio upper limit on GRB 080205
  95. INT+WFC R-band observations of GRB 080205
  96. GRB 080205, Swift-BAT refined analysis
  97. IPN localization of very hard GRB 080204
  98. GRB 080205: Swift XRT refined analysis
  99. GRB 080205: Swift/UVOT observations
  100. GRB 080205: Enhanced Swift-XRT position

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