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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"

20357 results found.

  1. GRB 080307: GAO 150cm telescope Optical Observation
  2. GRB 080229A: GAO 150cm telescope Optical Observation
  3. GRB 080310, Swift-BAT refined analysis
  4. GRB 080310: Swift/UVOT Refined Analysis
  5. GRB 080310 - SDSS Pre-Burst Observations
  6. GRB 080310: Enhanced Swift-XRT position
  7. GRB 080310: RRM optical photometry with the VLT
  8. GRB 080310: REM observations
  9. GRB 080310: Swift detection of a burst with optical afterglow
  10. GRB080307, optical upper limit
  11. GRB080229, optical upper limit
  12. GRB 080307: Swift-XRT Team refined analysis
  13. GRB 080307: Swift/UVOT Upper Limits
  14. GRB 080307, Swift-BAT refined analysis
  15. GRB080307 - SDSS Pre-Burst Observations
  16. GRB 080307: TNT optical observation
  17. GRB080307: Optical upper limits
  18. GRB 080307: Gemini-N i-band observations - candidate afterglow
  19. GRB 080307: Enhanced Swift-XRT position
  20. GRB 080307, Preliminary Swift-BAT refined analysis
  21. GRB 080307: Optical observation with DMC/KANATA
  22. GRB 080307: Swift detection of a burst
  23. VLA possible radio detection of GRB 080229
  24. GRB080303: Swift XRT refined analysis
  25. GRB 080303: Enhanced Swift-XRT position
  26. Swift UVOT observations of GRB080229B
  27. GRB 080303: Swift detection of a burst with optical afterglow
  28. GRB 080303: REM NIR afterglow candidate
  29. GRB 080303A: ROTSE-III Optical Limits
  30. GRB 080229: I-band observations from OSN
  31. GRB 080229: VLT NIR observations
  32. GRB 080229: TNG NIR observations
  33. GRB 080229: Enhanced Swift-XRT position
  34. GRB 080229: REM NIR observations
  35. GRB080229: Possible optical afterglow
  36. UVOT analysis for GRB080229
  37. GRB 080229A: ROTSE-III Optical Limits
  38. GRB 080229: Swift detection of a bright burst
  39. GRB080205: optical observations
  40. XRF 080109/SN2008D : GMRT upper limit at 1.28 GHz
  41. GRB 071010B : Early optical brightening detected by TAOS
  42. Swift/UVOT observations of GRB080218B
  43. GRB 080218B: REM NIR early upper limits
  44. GRB 080218B: Enhanced Swift-XRT position
  45. GRB 080218B: GROND upper limits
  46. Swift-XRT and UVOT observations of the IPN burst GRB 080211
  47. GRB 080212: VLT optical rapid decay
  48. VLA radio upper limit on GRB 080212
  49. Swift/UVOT refined analysis of GRB080212
  50. GRB080212: Optical afterglow candidate observed by MITSuME Telescope
  51. GRB 080212: GROND detects afterglow
  52. GRB 080212: REM NIR afterglow?
  53. GRB 080212: Enhanced Swift-XRT position
  54. GRB 080210: Keck photometry
  55. VLA non-detection of GRB 080210
  56. GRB 080212: Swift detection of a burst
  57. GRB 080207: VLT NIR early upper limits
  58. GRB 080210: Swift/UVOT Refined Analysis
  59. GRB 080210, Swift-BAT refined analysis
  60. GRB 080210: Super-LOTIS observations
  61. GRB 080210: Enhanced Swift-XRT position
  62. GRB 080210: GOND detection in all bands and redshift upper limit
  63. GRB080210 - SDSS Pre-Burst Observations
  64. GRB 080210: Swift detection of a burst with optical afterglow
  65. GRB 080210: TAROT La Silla observatory optical detection
  66. GRB 080207: GROND upper limits
  67. GRB 080205: GAO 150cm telescope Optical limit
  68. GRB 080207: Optical limits from Gemini-South
  69. Swift detection of AX J1749.1-2639
  70. GRB 080207: Super-LOTIS observations
  71. GRB080207: RTT150 Optical Observations
  72. GRB 080207: REM NIR observations
  73. GRB080207: Swift/UVOT refined analysis
  74. GRB 080207: TAROT Calern observatory optical observations
  75. GRB 080207: Swift-XRT Refined Analysis
  76. GRB 080207: Enhanced Swift-XRT position
  77. GRB 080207: Swift detection of a burst
  78. GRB 080205: optical observation
  79. VLA radio upper limit on GRB 080205
  80. INT+WFC R-band observations of GRB 080205
  81. IPN localization of very hard GRB 080204
  82. GRB 080205: Swift XRT refined analysis
  83. GRB 080205: OA evolution from KAIT observations
  84. GRB 080205: Swift/UVOT observations
  85. GRB 080205: Enhanced Swift-XRT position
  86. Swift-BAT Trigger #302454, correction of GCN notice, update on AX J1749.1-2639
  87. GRB 080130: Swift-BAT refined analysis
  88. GRB 080130: further Swift XRT observations confirm fading source
  89. GRB 080129: Swift/UVOT Refined Upper Limits
  90. Swift/UVOT observations of GRB080130
  91. GRB 080130: REM NIR observations
  92. GRB 080130(?): Swift XRT observation
  93. GRB 080129: Swift-XRT refined analysis
  94. GRB 080129: KAIT optical limits
  95. GRB 080129: TAROT La Silla observatory optical observations
  96. GRB 080129: Gemini-South photometry
  97. GRB 080129: GROND detection in all bands, and fading
  98. GRB 080129: GROND detection of the optical/NIR afterglow, and fading
  99. GRB 080129: Enhanced Swift-XRT position
  100. GRB 080129: Gemini-South Imaging Observations

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