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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"

36188 results found.

  1. GRB 110328A / Swift J164449.3+573451: Infrared transient
  2. GRB 110328A / Swift J164449.3+573451: Mondy optical observations
  3. GRB 110328/Swift J164449.3+573451: Fermi observations
  4. GRB 110328A / Swift J164449.3+573451: KASINICS K-band Observation
  5. GRB 110328A / Swift J164449.3+573451
  6. GRB 110328A / Swift J164449.3+573451: EVLA observations of a brightening radio source
  7. GRB 110328A / Swift J164449.3+573451: X-ray analysis and a mini-blazar analogy
  8. GRB 110328A / Swift J164449.3+573451: Gemini and UKIRT IR observations
  9. GRB 110328A / Swift J164449.3+573451: PAIRITEL NIR Detection in 2nd Epoch
  10. GRB 110328A / Swift J164449.3+573451: No optical variability of the optical counterpart
  11. GRB 110328A / Swift J164449.3+573451: beamed emission
  12. GRB 110328A / Swift J164449.3+573451: BAT refined analysis
  13. GRB 110328A / Swift J164449.3+573451: CARMA mm detection
  14. GRB 110328A / Swift J164449.3+573451: Konkoly observations
  15. GRB 110328A / Swift J164449.3+573451: LOAO R-band Observation
  16. GRB 110328A / Swift J164449.3+573451: PAIRITEL NIR Upper Limits
  17. GRB 110328A / Swift J164449.3+573451: optical observations
  18. GRB 110328A / Swift J164449.3+573451: EVLA Detection
  19. GRB 110328B: Fermi-LAT Detection
  20. GRB 110328A / Swift J164449.3+573451: optical spectroscopy from GTC
  21. GRB 110328A: Gemini spectroscopic observations
  22. GRB 110213A, the review of the sky area in plate archives
  23. GRB 110328B: Fermi GBM detection
  24. GRB 110328A / Swift J164449.3+573451: NOT optical observations.
  25. GRB 110328A/ Swift J164449.3+573451 : Xinglong TNT Upper limit
  26. GRB / X-ray transient 110328A: MITSuME OkayamaOptical upper limits
  27. GRB 110328A / Swift J164449.3+573451: PTF Quiescent Optical Counterpart
  28. GRB 110328A: Enhanced Swift-XRT position
  29. GRB / X-ray transient 110328A: Gemini optical observations
  30. GRB 110328A: a second trigger, probably a hard X-ray transient (Swift J164449.3+573451)
  31. GRB 110328A: Swift detection of a burst
  32. Fermi Gamma-ray Burst Monitor trigger 322686470 (110324797) is not a GRB
  33. GRB 110319B Swift-XRT afterglow confirmation
  34. GRB 101225A: revised analysis of narrow band imaging
  35. GRB 110319B BAT refined analysis
  36. GRB 110319B: Swift/UVOT Upper Limits
  37. GRB 110318B: Swift/UVOT Upper Limits
  38. GRB 110319B: GROND upper limits
  39. GRB 110319B: Swift-XRT afterglow candidate.
  40. GRB 110319B found in ground analysis of Swift-BAT data
  41. GRB 110319A: Swift/UVOT Detection
  42. GRB 110319A: Swift-BAT refined analysis
  43. GRB 110319A: Swift-XRT refined Analysis
  44. GRB 110318B: GROND upper limits
  45. GRB 110319A: Enhanced Swift-XRT position
  46. GRB 110319A: Swift detection of a burst
  47. GRB 110318B: Swift-XRT refined Analysis
  48. GRB 110318A: Fermi GBM detection
  49. GRB 110318B: Swift-BAT refined analysis
  50. GRB 110318B: Enhanced Swift-XRT position
  51. GRB 110318A: Swift-BAT refined analysis
  52. GRB 110318B: Swift/UVOT Non-Detection of an Afterglow
  53. GRB 110318B: Swift detection of a burst
  54. GRB 110318A: Swift detection of a burst
  55. Fermi GBM trigger 321944155 (110316205) is not a GRB
  56. GRB 110315A: RTT150 optical observations
  57. GRB 110315A: Swift/UVOT Upper Limits
  58. GRB 110315A: Swift-XRT refined Analysis
  59. GRB 110315A: Swift-BAT refined analysis
  60. GRB 110315A: Enhanced Swift-XRT position
  61. GRB 110315A: MASTER early optical observations
  62. GRB 110315A: Swift detection of a burst
  63. GRB110312A: MITSuME Okayama Optical upper limits
  64. GRB 110312A: RTT150 optical observations
  65. GRB 110312A: Swift/UVOT Upper Limits
  66. GRB 110312A: Swift-XRT refined Analysis
  67. GRB 110312A: GROND Upper Limits
  68. GRB 110312A: Enhanced Swift-XRT position
  69. GRB 110312A: Swift-BAT refined analysis
  70. GRB 110312A: Swift detection of a burst
  71. GRB 110305A: REM detection of a possible NIR afterglow
  72. GRB110305A: MITSuME Ishigakijima Optical upper limits
  73. GRB 110305A: Swift/UVOT Upper Limits
  74. GRB 110305A: Swift-XRT refined Analysis
  75. GRB 110305A: Enhanced Swift-XRT position
  76. GRB 110305A: Swift-BAT refined analysis
  77. IBAS trigger n. 6138 is not a GRB
  78. GRB 110305A: GROND Detection of Optical Afterglow
  79. GRB 110305A: Swift detection of a burst
  80. GRB 110223A: optical upper limits
  81. GRB 110301A: Fermi GBM detection
  82. GRB101225A: early EVLA Observations of Christmas Burst
  83. Swift/UVOT observations of GRB110223A
  84. No IPN GRB detected in conjunction with candidate GRB 110215
  85. GRB GRB 110223A: MASTER VWF early optical observations
  86. IBAS distribution of coordinates for low significance INTEGRAL GRB triggers
  87. GRB 110223A: Swift-BAT refined analysis
  88. GRB 110223A : early optical limit by "Pi of the Sky"
  89. GRB 110223A: Liverpool Telescope observations
  90. GRB 110223A: Swift-XRT refined Analysis
  91. GRB 110223B: Swift-XRT refined Analysis
  92. GRB 110223A: Enhanced Swift-XRT position
  93. GRB 110223B: Enhanced Swift-XRT position
  94. GRB 110223B: Swift-BAT refined analysis
  95. GRB 110223B: GROND Detection of Optical Afterglow Candidate
  96. GRB 110223A: Observations from BOOTES-2
  97. GRB 110223B: Swift detection of a burst
  98. GRB 110223A: Swift detection of a burst
  99. GRB 101225A, the review of the sky area in plate archives
  100. OT 110215: Further NIR observations from NOT of the GRB candidate

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