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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"

27401 results found.

  1. GRB 080315: Optical observations
  2. GRB 080315: TAROT Calern observatory optical observations
  3. GRB 080315: Swift detection of a possible burst
  4. GRB 080307: GAO 150cm telescope Optical Observation
  5. GRB 080229A: GAO 150cm telescope Optical Observation
  6. GRB 080310, Swift-BAT refined analysis
  7. GRB080210: optical observations
  8. GRB 080310: Swift-XRT refined analysis
  9. GRB 080310: Swift/UVOT Refined Analysis
  10. GRB 080310 - SDSS Pre-Burst Observations
  11. GRB 080310: Enhanced Swift-XRT position
  12. GRB 080310: RRM optical photometry with the VLT
  13. GRB080310, optical observations with LBT
  14. GRB 080310: REM observations
  15. GRB 080310: Swift detection of a burst with optical afterglow
  16. GRB080307, optical upper limit
  17. GRB080229, optical upper limit
  18. GRB 080307: Swift-XRT Team refined analysis
  19. GRB 080307: Swift/UVOT Upper Limits
  20. GRB 080307, Swift-BAT refined analysis
  21. GRB080307 - SDSS Pre-Burst Observations
  22. GRB 080307: TNT optical observation
  23. GRB080307: Optical upper limits
  24. GRB 080307: Gemini-N i-band observations - candidate afterglow
  25. GRB 080307: retraction of UVOT candidate
  26. GRB 080307: Enhanced Swift-XRT position
  27. GRB 080307, Preliminary Swift-BAT refined analysis
  28. GRB 080307: Optical observation with DMC/KANATA
  29. GRB 080307: Swift detection of a burst
  30. VLA possible radio detection of GRB 080229
  31. GRB 080303, Swift-BAT refined analysis
  32. GRB080303: Swift XRT refined analysis
  33. GRB 080303: Enhanced Swift-XRT position
  34. Swift UVOT observations of GRB080229B
  35. GRB080229B: Swift XRT afterglow observation
  36. GRB 080303: Swift detection of a burst with optical afterglow
  37. GRB 080303: REM NIR afterglow candidate
  38. GRB 080303A: ROTSE-III Optical Limits
  39. GRB 080229: I-band observations from OSN
  40. GRB 080229: VLT NIR observations
  41. GRB080229: Swift XRT refined analysis
  42. GRB 080229: TNG NIR observations
  43. GRB 080229: Enhanced Swift-XRT position
  44. GRB 080229: REM NIR observations
  45. GRB080229: Possible optical afterglow
  46. GRB 080229B: Gamma Ray Burst Localization by SuperAGILE
  47. UVOT analysis for GRB080229
  48. GRB 080229, Swift-BAT refined analysis
  49. GRB 080229A: ROTSE-III Optical Limits
  50. GRB 080229: Swift detection of a bright burst
  51. XRF 080109/SN2008D : GMRT upper limit at 1.28 GHz
  52. Swift-XRT improved positions, and new redshift limits.
  53. ESO optical and NIR observations of GRB 080218B
  54. GRB 080204: Suzaku WAM observation of the prompt emission
  55. GRB 080218B, Swift-BAT refined analysis
  56. GRB 080218B: Swift-XRT refined analysis
  57. Swift/UVOT observations of GRB080218B
  58. GRB 080218B: REM NIR early upper limits
  59. GRB 080218B: Enhanced Swift-XRT position
  60. GRB 080218B: GROND upper limits
  61. GRB 080218A, Swift-BAT refined analysis
  62. GRB 080211: Suzaku WAM observation of the prompt emission
  63. Swift-XRT and UVOT observations of the IPN burst GRB 080211
  64. VLA radio upper limit on GRB 080212
  65. Swift/UVOT refined analysis of GRB080212
  66. GRB 080212, Swift-BAT refined analysis
  67. GRB080212: Optical afterglow candidate observed by MITSuME Telescope
  68. GRB 080212: GROND detects afterglow
  69. GRB 080212: REM NIR afterglow?
  70. GRB 080212: Enhanced Swift-XRT position
  71. GRB 080212: Swift-XRT Team refined analysis
  72. GRB 080210: Keck photometry
  73. VLA non-detection of GRB 080210
  74. GRB 080212: Swift detection of a burst
  75. GRB 080207: VLT NIR early upper limits
  76. GRB 080210: Swift/UVOT Refined Analysis
  77. GRB 080210, Swift-BAT refined analysis
  78. GRB 080210: Super-LOTIS observations
  79. GRB 080210: Swift-XRT Refined Analysis
  80. GRB 080210: Enhanced Swift-XRT position
  81. GRB 080210: GOND detection in all bands and redshift upper limit
  82. GRB080210 - SDSS Pre-Burst Observations
  83. GRB 080210: Swift detection of a burst with optical afterglow
  84. GRB 080210: TAROT La Silla observatory optical detection
  85. GRB 080207: GROND upper limits
  86. GRB 080205: GAO 150cm telescope Optical limit
  87. GRB 080207, Swift-BAT refined analysis
  88. GRB 080207: Optical limits from Gemini-South
  89. Swift detection of AX J1749.1-2639
  90. GRB 080207: Super-LOTIS observations
  91. GRB 080207, Swift-BAT refined analysis
  92. Swift Trigger 302777 is not a GRB
  93. GRB080207: RTT150 Optical Observations
  94. GRB 080207: REM NIR observations
  95. GRB080207: Swift/UVOT refined analysis
  96. GRB 080207: TAROT Calern observatory optical observations
  97. GRB 080207: Swift-XRT Refined Analysis
  98. GRB 080207: Enhanced Swift-XRT position
  99. GRB 080207: Swift detection of a burst
  100. GRB 080205: optical observation

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