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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"

25835 results found.

  1. GRB 080320 - SDSS Pre-Burst Observations
  2. GRB 080320: Swift detection of a burst
  3. GRB 080319B : Lulin observation of temporal break at 0.2 days
  4. GRB 080319C - SDSS Pre-Burst Observations
  5. GRB 080319A SDSS Pre-Burst Observations
  6. GRB080319B - SDSS Pre-Burst Observations
  7. GRB 080319A: Swift-XRT Team Refined Analysis
  8. GRB 080319B, Swift-BAT refined analysis
  9. GRB 080319C: Swift-XRT Team Refined Analysis
  10. GRB 080319B: Swift-XRT Team Refined Analysis
  11. GRB 080319D: Swift/UVOT Refined Analysis of the Fading Optical Afterglow Candidate
  12. GRB 080319C: AGILE-MCAL observation of the prompt emission
  13. GRB 080319D: MASTER-VWF-Kislovodsk optical observation
  14. GRB 080319C: MASTER-VWF-Kislovodsk optical observation
  15. GRB 080319D: Swift detection of a burst with a possible optical afterglow
  16. GRB 080319B: TORTORA synchronous observation
  17. GRB 080319B: Enhanced Swift-XRT position
  18. GRB 080319A: Enhanced Swift-XRT position
  19. GRB 080319A, Swift-BAT refined analysis
  20. GRB 080319B: REM early data
  21. GRB 080319C: Swift detection of a burst with an optical afterglow
  22. GRB 080319A: REM observations
  23. GRB 080319B: Change in power law decay index
  24. GRB 080319B: Gemini-South Spectroscopy
  25. GRB 080319A: optical observations at the NOT
  26. GRB 080319B: REM observations
  27. GRB080319A: P60 Optical Afterglow Observations
  28. GRB 080319B: Swift detection of an intense burst with a bright optical counterpart
  29. GRB 080319A: Swift detection of a burst
  30. Swift Trigger 306745 is not a GRB
  31. Swift Trigger 306616 is not a GRB
  32. GRB080315: Bok Optical Observations
  33. Swift/UVOT observations of GRB 080315
  34. Swift trigger 306323: Swift-BAT/XRT refined analysis
  35. GRB 080315: Optical observations
  36. GRB 080315: TAROT Calern observatory optical observations
  37. GRB 080315: Swift detection of a possible burst
  38. GRB 080307: GAO 150cm telescope Optical Observation
  39. GRB 080229A: GAO 150cm telescope Optical Observation
  40. GRB 080310, Swift-BAT refined analysis
  41. GRB080210: optical observations
  42. GRB 080310: Swift-XRT refined analysis
  43. GRB 080310: Swift/UVOT Refined Analysis
  44. GRB 080310 - SDSS Pre-Burst Observations
  45. GRB 080310: Enhanced Swift-XRT position
  46. GRB 080310: RRM optical photometry with the VLT
  47. GRB080310, optical observations with LBT
  48. GRB 080310: REM observations
  49. GRB 080310: Swift detection of a burst with optical afterglow
  50. GRB080307, optical upper limit
  51. GRB080229, optical upper limit
  52. GRB 080307: Swift-XRT Team refined analysis
  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: retraction of UVOT candidate
  60. GRB 080307: Enhanced Swift-XRT position
  61. GRB 080307, Preliminary Swift-BAT refined analysis
  62. GRB 080307: Optical observation with DMC/KANATA
  63. GRB 080307: Swift detection of a burst
  64. VLA possible radio detection of GRB 080229
  65. GRB 080303, Swift-BAT refined analysis
  66. GRB080303: Swift XRT refined analysis
  67. GRB 080303: Enhanced Swift-XRT position
  68. Swift UVOT observations of GRB080229B
  69. GRB080229B: Swift XRT afterglow observation
  70. GRB 080303: Swift detection of a burst with optical afterglow
  71. GRB 080303: REM NIR afterglow candidate
  72. GRB 080303A: ROTSE-III Optical Limits
  73. GRB 080229: I-band observations from OSN
  74. GRB 080229: VLT NIR observations
  75. GRB080229: Swift XRT refined analysis
  76. GRB 080229: TNG NIR observations
  77. GRB 080229: Enhanced Swift-XRT position
  78. GRB 080229: REM NIR observations
  79. GRB080229: Possible optical afterglow
  80. GRB 080229B: Gamma Ray Burst Localization by SuperAGILE
  81. UVOT analysis for GRB080229
  82. GRB 080229, Swift-BAT refined analysis
  83. GRB 080229A: ROTSE-III Optical Limits
  84. GRB 080229: Swift detection of a bright burst
  85. XRF 080109/SN2008D : GMRT upper limit at 1.28 GHz
  86. Swift-XRT improved positions, and new redshift limits.
  87. ESO optical and NIR observations of GRB 080218B
  88. GRB 080204: Suzaku WAM observation of the prompt emission
  89. GRB 080218B, Swift-BAT refined analysis
  90. GRB 080218B: Swift-XRT refined analysis
  91. Swift/UVOT observations of GRB080218B
  92. GRB 080218B: REM NIR early upper limits
  93. GRB 080218B: Enhanced Swift-XRT position
  94. GRB 080218B: GROND upper limits
  95. GRB 080218A, Swift-BAT refined analysis
  96. GRB 080211: Suzaku WAM observation of the prompt emission
  97. Swift-XRT and UVOT observations of the IPN burst GRB 080211
  98. VLA radio upper limit on GRB 080212
  99. Swift/UVOT refined analysis of GRB080212
  100. GRB 080212, Swift-BAT refined analysis

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