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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"

27321 results found.

  1. GRB 140110A: Swift/UVOT retraction of UVOT candidates
  2. IPN Triangulation of GRB 140110A
  3. GRB 140110A: Swift/UVOT Observations
  4. GRB 140108A: Suzaku WAM observation of the prompt emission
  5. GRB 140104B: Suzaku WAM observation of the prompt emission
  6. GRB 140110A: Swift XRT observations
  7. GRB 140108A: Mondy optical upper limit
  8. GRB 140105A: MASTER-Net early optical observations and time correction
  9. GRB 140108A: Swift-BAT refined analysis
  10. GRB 140108A: Fermi GBM detection
  11. GRB 140108A: Swift/UVOT Detection
  12. GRB 140108A: theoretical prediction of redshift and of supernova occurrence
  13. GRB 140108A: Swift-XRT refined Analysis
  14. GRB 140108A: Enhanced Swift-XRT position
  15. GRB 140108A: Mondy optical observations
  16. GRB 140108A: D50+BART optical candidate detection
  17. GRB 140108A: 1.23m CAHA observations
  18. GRB 140108A: MASTER-Net OT detection
  19. GRB 140108A: Swift detection of a burst
  20. GRB 140105A: HCT Observations
  21. Swift-BAT triggered on KS 1947+300
  22. GRB 140105A: Swift XRT observations
  23. GRB 140103A: Swift XRT afterglow confirmation
  24. GRB 140105A/Fermi410578384: MASTER-Net early optical observations
  25. GRB 140104B: Swift XRT observations
  26. GRB 140102A: Swift/UVOT Detection
  27. LOAO R-band Observation of GRB 140102A
  28. GRB 140105A: Fermi GBM detection
  29. GRB 140104B: Fermi GBM observation
  30. Fermi410578384: iPTF optical afterglow candidates for a possible short GRB
  31. GRB 131209A: Further Swift XRT observations
  32. GRB 140103A: Lulin Optical r-band Observations
  33. GRB 131231A : Lulin Optical Observations
  34. GRB 140102A, Optical Observations
  35. GRB 140103A: P60 Observations
  36. GRB 140102A: P60 observations
  37. GRB 131231A: Swift/UVOT Observations of the Optical Afterglow
  38. GRB 140103A: Swift/UVOT Upper Limits
  39. GRB 131229A: Suzaku WAM observation of the prompt emission
  40. GRB 140102A: GROND observations
  41. GRB 140103A, Swift-BAT refined analysis
  42. GRB 140102A, Swift-BAT refined analysis
  43. GRB 140102A: Swift-XRT refined Analysis
  44. GRB 140102A: Fermi-LAT detection of a burst
  45. GRB 140102A: Enhanced Swift-XRT position
  46. GRB 140103A: Swift detection of a burst
  47. GRB 140102A: Early optical observations from Nanshan
  48. GRB 131224B detected in ground analysis of Swift-BAT data
  49. GRB 140102A: Swift detection of a burst with optical counterpart
  50. GRB 131229A: Fermi GBM detection
  51. GRB 131231A: P60 observations
  52. GRB 131231A: Swift-XRT observations
  53. GRB 131231A: MDM afterglow observation
  54. GRB 131231A: iPTF optical afterglow candidate coincident with Nanshan detection
  55. GRB 131231A: Nanshan afterglow candidate
  56. GRB 131231A: Fermi-LAT detection of a burst
  57. GRB 131229A: Magellan upper limit
  58. GRB 131229A: GROND observations
  59. GRB 131229A: Swift-BAT refined analysis
  60. GRB 131229A: Swift-XRT refined Analysis
  61. GRB 131229A: Swift/UVOT Upper Limits
  62. GRB 131227A: GROND Upper Limits
  63. GRB 131229A: Enhanced Swift-XRT position
  64. GRB 131229A: Deep Gemini-South Imaging
  65. GRB 131229A: Swift detection of a burst
  66. GRB 131224A: 5.8 GHz VLA observations
  67. GRB 131227A: Swift-XRT refined Analysis
  68. GRB 131227A: Xinglong optical observations
  69. GRB 131227A: Swift/UVOT Upper Limits
  70. GRB 131227A: Swift-BAT refined analysis
  71. GRB 131227A: Enhanced Swift-XRT position
  72. GRB 131227A: OT candidate from KAIT Optical observations
  73. GRB 131227A: Swift detection of a burst
  74. GRB 131224A: Swift/UVOT Upper Limits
  75. GRB 131225A: MASTER-Net optical observations
  76. GRB 131226A, Swift-BAT refined analysis
  77. GRB 131226A: Swift detection of a burst
  78. GRB 131216A: Suzaku WAM observation of the prompt emission
  79. GRB 131224A: Swift-XRT observation
  80. GRB 131225A: MAXI/GSC detection
  81. GRB 131224A: MASTER-Net early optical observations
  82. GRB 131224A: A short GRB detected by INTEGRAL
  83. GRB 131218A: GROND Upper Limits
  84. GRB 131218A: Swift XRT and UVOT observations
  85. GRB 131218A: Zadko observatory - Gingin optical candidate
  86. GRB 131218A: TAROT La Silla observatory optical observations
  87. IPN Triangulation of GRB 131216A
  88. GRB 131216A: Fermi GBM observation
  89. GRB 131216A: Fermi-LAT detection of a burst
  90. GRB 131215A: MAXI/GSC detection
  91. Trigger 581129: Swift-BAT triggered on noise
  92. GRB 131205A: GROND confirmation of afterglow
  93. INTEGRAL Weak trigger #6403: AROMA-N Optical Observation
  94. GRB 131209A: Swift XRT and UVOT observations
  95. GRB 131209A: Fermi GBM observation
  96. IPN Triangulation of GRB 131209A
  97. GRB131202A : GROND observations
  98. GRB131205A : GROND Observations
  99. GRB 131205A: Swift-BAT refined analysis
  100. GRB 131205A: Swift-XRT refined Analysis

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