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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"

32494 results found.

  1. GRB 080307, Preliminary Swift-BAT refined analysis
  2. VLA possible radio detection of GRB 080229
  3. GRB 080303: Swift/UVOT follow-up of afterglow detection
  4. GRB 080303, Swift-BAT refined analysis
  5. GRB 080303: Rapid PROMPT Detections
  6. GRB080303: Swift XRT refined analysis
  7. Swift UVOT observations of GRB080229B
  8. GRB080229B: Swift XRT afterglow observation
  9. GRB 080303A: Faulkes Telescope South optical afterglow observations
  10. GRB 080303A: ROTSE-III Optical Limits
  11. GRB 080229: I-band observations from OSN
  12. GRB 080229: VLT NIR observations
  13. GRB080229: Swift XRT refined analysis
  14. GRB 080229: TNG NIR observations
  15. GRB 080229: Deep Gemini/GMOS optical observations
  16. GRB 080229: REM NIR observations
  17. GRB080229: Possible optical afterglow
  18. UVOT analysis for GRB080229
  19. GRB 080229, Swift-BAT refined analysis
  20. GRB 080229: Faulkes Telescope South optical limit
  21. GRB 080229A: ROTSE-III Optical Limits
  22. Early optical shallow decay in GRB 071112C
  23. GRB080207: optical observations
  24. GRB080205: optical observations
  25. GRB080211: optical observations
  26. XRF 080109/SN2008D : GMRT upper limit at 1.28 GHz
  27. GRB 071010B : Early optical brightening detected by TAOS
  28. Swift-XRT improved positions, and new redshift limits.
  29. ESO optical and NIR observations of GRB 080218B
  30. GRB 080204: Suzaku WAM observation of the prompt emission
  31. GRB 080218B, Swift-BAT refined analysis
  32. GRB 080218B: Swift-XRT refined analysis
  33. Swift/UVOT observations of GRB080218B
  34. GRB 080218B: REM NIR early upper limits
  35. GRB 080212: Mount Abu NIR observations
  36. GRB 080218B: GROND upper limits
  37. GRB 080218b, SMARTS optical/IR limits
  38. GRB 080218A, Swift-BAT refined analysis
  39. GRB080218B: Watcher prompt limit
  40. GRB 080211: Suzaku WAM observation of the prompt emission
  41. Swift-XRT and UVOT observations of the IPN burst GRB 080211
  42. GRB 080212: VLT optical rapid decay
  43. GRB 080212: REM refined analysis
  44. Konus-Wind observation of GRB 080211
  45. VLA radio upper limit on GRB 080212
  46. Swift/UVOT refined analysis of GRB080212
  47. GRB 080212, Swift-BAT refined analysis
  48. GRB080212: Optical afterglow candidate observed by MITSuME Telescope
  49. GRB 080212: Gemini-South optical observations
  50. GRB 080212: GROND detects afterglow
  51. GRB 080212: REM NIR afterglow?
  52. GRB 080212: optical observations
  53. GRB 080212: Swift-XRT Team refined analysis
  54. GRB 080210: Keck photometry
  55. VLA non-detection of GRB 080210
  56. GRB 080207: VLT NIR early upper limits
  57. GRB 080210: Swift/UVOT Refined Analysis
  58. GRB 080207: optical observations.
  59. GRB 080210: Hobby-Eberly Telescope Absorption Spectroscopy
  60. GRB 080210, Swift-BAT refined analysis
  61. GRB 080210: Super-LOTIS observations
  62. GRB 080210: Swift-XRT Refined Analysis
  63. GRB 080210: VLT redshift
  64. GRB 080210: Rapid PROMPT Detections
  65. GRB 080210: GOND detection in all bands and redshift upper limit
  66. GRB 080207: GROND upper limits
  67. GRB 080205: GAO 150cm telescope Optical limit
  68. GRB 080207, Swift-BAT refined analysis
  69. GRB 080207: Optical limits from Gemini-South
  70. GRB 080205: RTT150 optical observations
  71. Swift detection of AX J1749.1-2639
  72. GRB 080207: Super-LOTIS observations
  73. GRB 080207, Swift-BAT refined analysis
  74. GRB080207: RTT150 Optical Observations
  75. GRB 080207: REM NIR observations
  76. GRB080207: Swift/UVOT refined analysis
  77. GRB 080207: Swift-XRT Refined Analysis
  78. Konus-Wind observation of GRB 080204
  79. GRB 080205 optical upper limit
  80. GRB 080205: MASTER optical observation
  81. GRB 080205: optical observation
  82. VLA radio upper limit on GRB 080205
  83. INT+WFC R-band observations of GRB 080205
  84. GRB 080205, Swift-BAT refined analysis
  85. GRB 080205: Swift XRT refined analysis
  86. GRB 080205: OA evolution from KAIT observations
  87. GRB 080205: Swift/UVOT observations
  88. Swift-BAT Trigger #302454, correction of GCN notice, update on AX J1749.1-2639
  89. GRB 080130: Swift-BAT refined analysis
  90. GRB 080130: further Swift XRT observations confirm fading source
  91. GRB 080129: Swift/UVOT Refined Upper Limits
  92. Swift/UVOT observations of GRB080130
  93. GRB 080130: REM NIR observations
  94. GRB 080130(?): Swift XRT observation
  95. GRB 080130?: Detection of a possible burst by BATSS
  96. GRB 080129: Optical observations from OSN
  97. GRB 080129: Swift-XRT refined analysis
  98. X-ray transient in NGC 2770: RTT150 optical observations
  99. GRB 080129: KAIT optical limits
  100. GRB 080123: Early afterglow detection with BATSS (BAT Slew Survey)

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