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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"

32495 results found.

  1. GRB 080307: retraction of UVOT candidate
  2. GRB 080307, Preliminary Swift-BAT refined analysis
  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. Swift UVOT observations of GRB080229B
  9. GRB080229B: Swift XRT afterglow observation
  10. GRB 080303A: Faulkes Telescope South optical afterglow observations
  11. GRB 080303A: ROTSE-III Optical Limits
  12. GRB 080229: I-band observations from OSN
  13. GRB 080229: VLT NIR observations
  14. GRB080229: Swift XRT refined analysis
  15. GRB 080229: TNG NIR observations
  16. GRB 080229: Deep Gemini/GMOS optical observations
  17. GRB 080229: REM NIR observations
  18. GRB080229: Possible optical afterglow
  19. UVOT analysis for GRB080229
  20. GRB 080229, Swift-BAT refined analysis
  21. GRB 080229: Faulkes Telescope South optical limit
  22. GRB 080229A: ROTSE-III Optical Limits
  23. Early optical shallow decay in GRB 071112C
  24. GRB080207: optical observations
  25. GRB080205: optical observations
  26. GRB080211: optical observations
  27. XRF 080109/SN2008D : GMRT upper limit at 1.28 GHz
  28. GRB 071010B : Early optical brightening detected by TAOS
  29. Swift-XRT improved positions, and new redshift limits.
  30. ESO optical and NIR observations of GRB 080218B
  31. GRB 080204: Suzaku WAM observation of the prompt emission
  32. GRB 080218B, Swift-BAT refined analysis
  33. GRB 080218B: Swift-XRT refined analysis
  34. Swift/UVOT observations of GRB080218B
  35. GRB 080218B: REM NIR early upper limits
  36. GRB 080212: Mount Abu NIR observations
  37. GRB 080218B: GROND upper limits
  38. GRB 080218b, SMARTS optical/IR limits
  39. GRB 080218A, Swift-BAT refined analysis
  40. GRB080218B: Watcher prompt limit
  41. GRB 080211: Suzaku WAM observation of the prompt emission
  42. Swift-XRT and UVOT observations of the IPN burst GRB 080211
  43. GRB 080212: VLT optical rapid decay
  44. GRB 080212: REM refined analysis
  45. Konus-Wind observation of GRB 080211
  46. VLA radio upper limit on GRB 080212
  47. Swift/UVOT refined analysis of GRB080212
  48. GRB 080212, Swift-BAT refined analysis
  49. GRB080212: Optical afterglow candidate observed by MITSuME Telescope
  50. GRB 080212: Gemini-South optical observations
  51. GRB 080212: GROND detects afterglow
  52. GRB 080212: REM NIR afterglow?
  53. GRB 080212: optical observations
  54. GRB 080212: Swift-XRT Team refined analysis
  55. GRB 080210: Keck photometry
  56. VLA non-detection of GRB 080210
  57. GRB 080207: VLT NIR early upper limits
  58. GRB 080210: Swift/UVOT Refined Analysis
  59. GRB 080207: optical observations.
  60. GRB 080210: Hobby-Eberly Telescope Absorption Spectroscopy
  61. GRB 080210, Swift-BAT refined analysis
  62. GRB 080210: Super-LOTIS observations
  63. GRB 080210: Swift-XRT Refined Analysis
  64. GRB 080210: VLT redshift
  65. GRB 080210: Rapid PROMPT Detections
  66. GRB 080210: GOND detection in all bands and redshift upper limit
  67. GRB 080207: GROND upper limits
  68. GRB 080205: GAO 150cm telescope Optical limit
  69. GRB 080207, Swift-BAT refined analysis
  70. GRB 080207: Optical limits from Gemini-South
  71. GRB 080205: RTT150 optical observations
  72. Swift detection of AX J1749.1-2639
  73. GRB 080207: Super-LOTIS observations
  74. GRB 080207, Swift-BAT refined analysis
  75. GRB080207: RTT150 Optical Observations
  76. GRB 080207: REM NIR observations
  77. GRB080207: Swift/UVOT refined analysis
  78. GRB 080207: Swift-XRT Refined Analysis
  79. Konus-Wind observation of GRB 080204
  80. GRB 080205 optical upper limit
  81. GRB 080205: MASTER optical observation
  82. GRB 080205: optical observation
  83. VLA radio upper limit on GRB 080205
  84. INT+WFC R-band observations of GRB 080205
  85. GRB 080205, Swift-BAT refined analysis
  86. GRB 080205: Swift XRT refined analysis
  87. GRB 080205: OA evolution from KAIT observations
  88. GRB 080205: Swift/UVOT observations
  89. Swift-BAT Trigger #302454, correction of GCN notice, update on AX J1749.1-2639
  90. GRB 080130: Swift-BAT refined analysis
  91. GRB 080130: further Swift XRT observations confirm fading source
  92. GRB 080129: Swift/UVOT Refined Upper Limits
  93. Swift/UVOT observations of GRB080130
  94. GRB 080130: REM NIR observations
  95. GRB 080130(?): Swift XRT observation
  96. GRB 080130?: Detection of a possible burst by BATSS
  97. GRB 080129: Optical observations from OSN
  98. GRB 080129: Swift-XRT refined analysis
  99. X-ray transient in NGC 2770: RTT150 optical observations
  100. GRB 080129: KAIT optical limits

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