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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"

32491 results found.

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

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