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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"

17851 results found.

  1. GRB 080319B: optical upper limit
  2. GRB 080319D: optical upper limit
  3. GRB 080319C: UVOT Observations
  4. GRB 080319B: UVOT Observations
  5. GRB 080319A: UVOT Observations
  6. GRB 080320: Swift XRT refined analysis
  7. GRB 080320: J detection with FLAMINGOS
  8. GRB 080319D: Swift XRT refined analysis
  9. GRB 080320: optical limit
  10. GRB 080320: Gemini-N optical afterglow
  11. GRB 080319C, Swift-BAT refined analysis
  12. GRB 080320: Enhanced Swift-XRT position
  13. GRB 080320 - SDSS Pre-Burst Observations
  14. GRB 080320: Swift detection of a burst
  15. GRB 080319C - SDSS Pre-Burst Observations
  16. GRB 080319A SDSS Pre-Burst Observations
  17. GRB080319B - SDSS Pre-Burst Observations
  18. GRB 080319C: Swift-XRT Team Refined Analysis
  19. GRB 080319D: Swift/UVOT Refined Analysis of the Fading Optical Afterglow Candidate
  20. GRB 080319C: AGILE-MCAL observation of the prompt emission
  21. GRB 080319D: MASTER-VWF-Kislovodsk optical observation
  22. GRB 080319C: MASTER-VWF-Kislovodsk optical observation
  23. GRB 080319D: Swift detection of a burst with a possible optical afterglow
  24. GRB 080319B: TORTORA synchronous observation
  25. GRB 080319B: Enhanced Swift-XRT position
  26. GRB 080319A: Enhanced Swift-XRT position
  27. GRB 080319C: Swift detection of a burst with an optical afterglow
  28. GRB 080319A: REM observations
  29. GRB 080319B: Change in power law decay index
  30. GRB 080319A: optical observations at the NOT
  31. GRB 080319B: REM observations
  32. GRB080319A: P60 Optical Afterglow Observations
  33. GRB 080319B: Swift detection of an intense burst with a bright optical counterpart
  34. GRB 080319A: Swift detection of a burst
  35. GRB080315: Bok Optical Observations
  36. Swift/UVOT observations of GRB 080315
  37. GRB 080315: Optical observations
  38. GRB 080315: TAROT Calern observatory optical observations
  39. GRB 080315: Swift detection of a possible burst
  40. GRB 080307: GAO 150cm telescope Optical Observation
  41. GRB 080229A: GAO 150cm telescope Optical Observation
  42. GRB 080310, Swift-BAT refined analysis
  43. GRB 080310: Swift-XRT refined analysis
  44. GRB 080310: Swift/UVOT Refined Analysis
  45. GRB 080310 - SDSS Pre-Burst Observations
  46. GRB 080310: Enhanced Swift-XRT position
  47. GRB 080310: RRM optical photometry with the VLT
  48. GRB080310, optical observations with LBT
  49. GRB 080310: REM observations
  50. GRB 080310: Swift detection of a burst with optical afterglow
  51. GRB080307, optical upper limit
  52. GRB080229, optical upper limit
  53. GRB 080307: Swift/UVOT Upper Limits
  54. GRB 080307, Swift-BAT refined analysis
  55. GRB080307 - SDSS Pre-Burst Observations
  56. GRB 080307: TNT optical observation
  57. GRB080307: Optical upper limits
  58. GRB 080307: Gemini-N i-band observations - candidate afterglow
  59. GRB 080307: Enhanced Swift-XRT position
  60. GRB 080307, Preliminary Swift-BAT refined analysis
  61. GRB 080307: Optical observation with DMC/KANATA
  62. GRB 080307: Swift detection of a burst
  63. VLA possible radio detection of GRB 080229
  64. GRB 080303: Enhanced Swift-XRT position
  65. Swift UVOT observations of GRB080229B
  66. GRB 080303: Swift detection of a burst with optical afterglow
  67. GRB 080303: REM NIR afterglow candidate
  68. GRB 080303A: ROTSE-III Optical Limits
  69. GRB 080229: I-band observations from OSN
  70. GRB 080229: VLT NIR observations
  71. GRB 080229: TNG NIR observations
  72. GRB 080229: Enhanced Swift-XRT position
  73. GRB 080229: REM NIR observations
  74. GRB080229: Possible optical afterglow
  75. UVOT analysis for GRB080229
  76. GRB 080229A: ROTSE-III Optical Limits
  77. GRB 080229: Swift detection of a bright burst
  78. XRF 080109/SN2008D : GMRT upper limit at 1.28 GHz
  79. Swift/UVOT observations of GRB080218B
  80. GRB 080218B: REM NIR early upper limits
  81. GRB 080218B: Enhanced Swift-XRT position
  82. GRB 080218B: GROND upper limits
  83. GRB 080218A, Swift-BAT refined analysis
  84. Swift-XRT and UVOT observations of the IPN burst GRB 080211
  85. VLA radio upper limit on GRB 080212
  86. Swift/UVOT refined analysis of GRB080212
  87. GRB080212: Optical afterglow candidate observed by MITSuME Telescope
  88. GRB 080212: GROND detects afterglow
  89. GRB 080212: REM NIR afterglow?
  90. GRB 080212: Enhanced Swift-XRT position
  91. GRB 080210: Keck photometry
  92. VLA non-detection of GRB 080210
  93. GRB 080212: Swift detection of a burst
  94. GRB 080207: VLT NIR early upper limits
  95. GRB 080210: Swift/UVOT Refined Analysis
  96. GRB 080210: Super-LOTIS observations
  97. GRB 080210: Enhanced Swift-XRT position
  98. GRB 080210: GOND detection in all bands and redshift upper limit
  99. GRB080210 - SDSS Pre-Burst Observations
  100. GRB 080210: Swift detection of a burst with optical afterglow

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