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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"

42619 results found.

  1. GRB 080307, Preliminary Swift-BAT refined analysis
  2. GRB 080307: Swift detection of a burst
  3. VLA possible radio detection of GRB 080229
  4. GRB 080303: Swift/UVOT follow-up of afterglow detection
  5. GRB 080303, Swift-BAT refined analysis
  6. GRB 080303: Rapid PROMPT Detections
  7. GRB080303: Swift XRT refined analysis
  8. GRB 080303: Enhanced Swift-XRT position
  9. Swift UVOT observations of GRB080229B
  10. GRB080229B: Swift XRT afterglow observation
  11. GRB 080303A: Faulkes Telescope South optical afterglow observations
  12. GRB 080303
  13. GRB 080303: Swift detection of a burst with optical afterglow
  14. GRB 080303: REM NIR afterglow candidate
  15. GRB 080303A: ROTSE-III Optical Limits
  16. GRB 080229: I-band observations from OSN
  17. GRB 080229: VLT NIR observations
  18. GRB080229: Swift XRT refined analysis
  19. GRB 080229: Deep Gemini/GMOS optical observations
  20. GRB 080229: Enhanced Swift-XRT position
  21. GRB 080229: REM NIR observations
  22. GRB080229: Possible optical afterglow
  23. GRB 080229B: Gamma Ray Burst Localization by SuperAGILE
  24. UVOT analysis for GRB080229
  25. GRB 080229, Swift-BAT refined analysis
  26. GRB 080229: Faulkes Telescope South optical limit
  27. GRB 080229A: ROTSE-III Optical Limits
  28. GRB 080229: Swift detection of a bright burst
  29. Early optical shallow decay in GRB 071112C
  30. GRB080207: optical observations
  31. GRB080205: optical observations
  32. GRB080211: optical observations
  33. XRF 080109/SN2008D : GMRT upper limit at 1.28 GHz
  34. GRB 071010B : Early optical brightening detected by TAOS
  35. Swift-XRT improved positions, and new redshift limits.
  36. ESO optical and NIR observations of GRB 080218B
  37. GRB 080204: Suzaku WAM observation of the prompt emission
  38. GRB 080218B, Swift-BAT refined analysis
  39. GRB 080218B: Swift-XRT refined analysis
  40. Swift/UVOT observations of GRB080218B
  41. GRB 080218B: REM NIR early upper limits
  42. GRB 080218B: Enhanced Swift-XRT position
  43. GRB 080218B: GROND upper limits
  44. GRB 080218b, SMARTS optical/IR limits
  45. GRB 080218A, Swift-BAT refined analysis
  46. GRB 080211: Suzaku WAM observation of the prompt emission
  47. GRB 080218B: Swift detection of a burst
  48. GRB 080218: Swift detection of a burst
  49. Swift-XRT and UVOT observations of the IPN burst GRB 080211
  50. GRB 080212: VLT optical rapid decay
  51. GRB 080212: REM refined analysis
  52. Konus-Wind observation of GRB 080211
  53. VLA radio upper limit on GRB 080212
  54. Swift/UVOT refined analysis of GRB080212
  55. GRB 080212, Swift-BAT refined analysis
  56. GRB080212: Optical afterglow candidate observed by MITSuME Telescope
  57. GRB 080212: Gemini-South optical observations
  58. GRB 080212: GROND detects afterglow
  59. GRB 080212: REM NIR afterglow?
  60. GRB 080212: optical observations
  61. GRB 080212: Swift-XRT Team refined analysis
  62. GRB 080210: Keck photometry
  63. VLA non-detection of GRB 080210
  64. GRB 080212: Swift detection of a burst
  65. IPN localization of GRB 080211
  66. GRB 080207: VLT NIR early upper limits
  67. GRB 080210: Swift/UVOT Refined Analysis
  68. GRB 080207: optical observations.
  69. GRB 080210: Hobby-Eberly Telescope Absorption Spectroscopy
  70. GRB 080210, Swift-BAT refined analysis
  71. GRB 080210: Super-LOTIS observations
  72. GRB 080210: Swift-XRT Refined Analysis
  73. GRB 080210: VLT redshift
  74. GRB 080210: Rapid PROMPT Detections
  75. GRB 080210: GOND detection in all bands and redshift upper limit
  76. GRB080210 - SDSS Pre-Burst Observations
  77. GRB 080210: Swift detection of a burst with optical afterglow
  78. GRB 080210: TAROT La Silla observatory optical detection
  79. GRB 080207: GROND upper limits
  80. GRB 080207, Swift-BAT refined analysis
  81. GRB 080207: Optical limits from Gemini-South
  82. GRB 080205: RTT150 optical observations
  83. Swift detection of AX J1749.1-2639
  84. GRB 080207: Super-LOTIS observations
  85. GRB 080207, Swift-BAT refined analysis
  86. Swift Trigger 302777 is not a GRB
  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: Swift detection of a burst
  92. Konus-Wind observation of GRB 080204
  93. GRB 080205 optical upper limit
  94. GRB 080205: MASTER optical observation
  95. GRB 080205: optical observation
  96. VLA radio upper limit on GRB 080205
  97. INT+WFC R-band observations of GRB 080205
  98. GRB 080205, Swift-BAT refined analysis
  99. IPN localization of very hard GRB 080204
  100. GRB 080205: Swift XRT refined analysis

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