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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"
  1. GRB 080229, Swift-BAT refined analysis
  2. GRB 080229: Faulkes Telescope South optical limit
  3. GRB 080229A: ROTSE-III Optical Limits
  4. GRB 080229: Swift detection of a bright burst
  5. Early optical shallow decay in GRB 071112C
  6. GRB080207: optical observations
  7. GRB080205: optical observations
  8. GRB080211: optical observations
  9. XRF 080109/SN2008D : GMRT upper limit at 1.28 GHz
  10. GRB 071010B : Early optical brightening detected by TAOS
  11. Swift-XRT improved positions, and new redshift limits.
  12. ESO optical and NIR observations of GRB 080218B
  13. GRB 080204: Suzaku WAM observation of the prompt emission
  14. GRB 080218B, Swift-BAT refined analysis
  15. GRB 080218B: Swift-XRT refined analysis
  16. Swift/UVOT observations of GRB080218B
  17. GRB 080218B: REM NIR early upper limits
  18. GRB 080212: Mount Abu NIR observations
  19. GRB 080218B: Enhanced Swift-XRT position
  20. GRB 080218B: GROND upper limits
  21. GRB 080218b, SMARTS optical/IR limits
  22. GRB 080218A, Swift-BAT refined analysis
  23. GRB080218B: Watcher prompt limit
  24. GRB 080211: Suzaku WAM observation of the prompt emission
  25. GRB 080218B: Swift detection of a burst
  26. GRB 080218: Swift detection of a burst
  27. Swift-XRT and UVOT observations of the IPN burst GRB 080211
  28. GRB 080212: VLT optical rapid decay
  29. GRB 080212: REM refined analysis
  30. Konus-Wind observation of GRB 080211
  31. VLA radio upper limit on GRB 080212
  32. Swift/UVOT refined analysis of GRB080212
  33. GRB 080212, Swift-BAT refined analysis
  34. GRB080212: Optical afterglow candidate observed by MITSuME Telescope
  35. GRB 080212: Gemini-South optical observations
  36. GRB 080212: GROND detects afterglow
  37. GRB 080212: REM NIR afterglow?
  38. GRB 080212: optical observations
  39. GRB 080212: Enhanced Swift-XRT position
  40. GRB 080212: Swift-XRT Team refined analysis
  41. GRB 080210: Keck photometry
  42. VLA non-detection of GRB 080210
  43. GRB 080212: Swift detection of a burst
  44. IPN localization of GRB 080211
  45. GRB 080212: DSS/2MASS Galaxy at XRT position
  46. GRB 080207: VLT NIR early upper limits
  47. GRB 080210: Swift/UVOT Refined Analysis
  48. GRB 080207: optical observations.
  49. GRB 080210: Hobby-Eberly Telescope Absorption Spectroscopy
  50. GRB 080210, Swift-BAT refined analysis
  51. GRB 080210: Super-LOTIS observations
  52. GRB 080210: Swift-XRT Refined Analysis
  53. GRB 080210: VLT redshift
  54. GRB 080210: Enhanced Swift-XRT position
  55. GRB 080210: Rapid PROMPT Detections
  56. GRB 080210: GOND detection in all bands and redshift upper limit
  57. GRB080210 - SDSS Pre-Burst Observations
  58. GRB 080210: Swift detection of a burst with optical afterglow
  59. GRB 080210: TAROT La Silla observatory optical detection
  60. GRB 080207: GROND upper limits
  61. GRB 080205: GAO 150cm telescope Optical limit
  62. GRB 080207, Swift-BAT refined analysis
  63. GRB 080207: Optical limits from Gemini-South
  64. GRB 080205: RTT150 optical observations
  65. Swift detection of AX J1749.1-2639
  66. GRB 080207: Super-LOTIS observations
  67. GRB 080207, Swift-BAT refined analysis
  68. Swift Trigger 302777 is not a GRB
  69. GRB080207: RTT150 Optical Observations
  70. GRB 080207: REM NIR observations
  71. GRB080207: Swift/UVOT refined analysis
  72. GRB 080207: TAROT Calern observatory optical observations
  73. GRB 080207: Swift-XRT Refined Analysis
  74. GRB 080207: Enhanced Swift-XRT position
  75. GRB 080207: Swift detection of a burst
  76. Konus-Wind observation of GRB 080204
  77. GRB 080205 optical upper limit
  78. GRB 080205: MASTER optical observation
  79. GRB 080205: optical observation
  80. VLA radio upper limit on GRB 080205
  81. INT+WFC R-band observations of GRB 080205
  82. GRB 080205, Swift-BAT refined analysis
  83. IPN localization of very hard GRB 080204
  84. GRB 080205: Swift XRT refined analysis
  85. GRB 080205: OA evolution from KAIT observations
  86. GRB 080205: Swift/UVOT observations
  87. GRB 080205: Enhanced Swift-XRT position
  88. GRB 080205: KAIT OA detection
  89. GRB 080205: Swift detection of a burst
  90. Swift-BAT Trigger #302454, correction of GCN notice, update on AX J1749.1-2639
  91. GRB 080130: Swift-BAT refined analysis
  92. GRB 080130: further Swift XRT observations confirm fading source
  93. GRB 080129: Swift/UVOT Refined Upper Limits
  94. Swift/UVOT observations of GRB080130
  95. GRB 080130: REM NIR observations
  96. GRB 080130(?): Swift XRT observation
  97. GRB 080130?: Detection of a possible burst by BATSS
  98. GRB 080129: Optical observations from OSN
  99. GRB 080129: Swift-XRT refined analysis
  100. X-ray transient in NGC 2770: RTT150 optical observations

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