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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

45785 results found.

  1. Konus-Wind observation of GRB 140102A
  2. GRB 140103A: Swift-XRT refined analysis
  3. GRB 140102A: GROND observations
  4. GRB 140103A, Swift-BAT refined analysis
  5. GRB 140102A: MAXI/GSC detection
  6. GRB 140102A, Swift-BAT refined analysis
  7. GRB 140102A: Swift-XRT refined Analysis
  8. GRB 140103A: MASTER-Net optical observations
  9. GRB 140102A: Fermi-LAT detection of a burst
  10. GRB 140102A: I-band observations from IAC80 and 1.23m CAHA telescopes
  11. GRB 140102A: Enhanced Swift-XRT position
  12. GRB 140103A: Swift detection of a burst
  13. GRB 140102A: Early optical observations from Nanshan
  14. GRB 131224B detected in ground analysis of Swift-BAT data
  15. GRB 140102A: Swift detection of a burst with optical counterpart
  16. GRB 131231A: Gemini-South Redshift
  17. GRB 131229A: Fermi GBM detection
  18. GRB 131231A: P60 observations
  19. GRB 131227A: KAIT light curve analysis
  20. GRB 131231A: Swift-XRT observations
  21. GRB 131231A : xinglong TNT optical observation
  22. GRB 131231A: MDM afterglow observation
  23. GRB 131231A: VLT/X-shooter redshift
  24. GRB 131231A: Fermi GBM detection
  25. GRB 131231A: iPTF optical afterglow candidate coincident with Nanshan detection
  26. GRB 131231A: afterglow confirmation from the NOT
  27. GRB 131231A: Nanshan afterglow candidate
  28. GRB 131231A: Fermi-LAT detection of a burst
  29. Konus-Wind observation of GRB 131229A
  30. GRB 131229A: CARMA 3mm observations
  31. GRB 131229A: Magellan upper limit
  32. GRB 131229A: GROND observations
  33. GRB 131229A: Swift-BAT refined analysis
  34. GRB 131229A: Swift-XRT refined Analysis
  35. GRB 131229A: Swift/UVOT Upper Limits
  36. GRB 131227A: GROND Upper Limits
  37. GRB 131229A: Enhanced Swift-XRT position
  38. GRB 131229A: Deep Gemini-South Imaging
  39. GRB 131229A: KAIT Optical Upper Limit
  40. GRB 131229A: P60 nondetection
  41. GRB 131229A: Swift detection of a burst
  42. GRB 131224A: 5.8 GHz VLA observations
  43. GRB 131227A: P60 Limits
  44. GRB 131227A: Gemini-North Redshift
  45. GRB 131227A: Swift-XRT refined Analysis
  46. GRB 131227A: Xinglong optical observations
  47. GRB 131227A: Swift/UVOT Upper Limits
  48. GRB 131227A: Swift-BAT refined analysis
  49. Konus-Wind observation of GRB 131226A
  50. GRB 131227A: Enhanced Swift-XRT position
  51. GRB 131227A: OT candidate from KAIT Optical observations
  52. GRB 131227A: Swift detection of a burst
  53. GRB 131224A: Swift/UVOT Upper Limits
  54. GRB 131225A: MASTER-Net optical observations
  55. GRB 131226A, Swift-BAT refined analysis
  56. GRB 131226A: Swift detection of a burst
  57. GRB 131216A: Suzaku WAM observation of the prompt emission
  58. GRB 131224A: Swift-XRT observation
  59. GRB 131225A: MAXI/GSC detection
  60. GRB 131224A: MASTER-Net early optical observations
  61. GRB 131224A: A short GRB detected by INTEGRAL
  62. GRB 131218A: GROND Upper Limits
  63. GRB 131218A: Swift XRT and UVOT observations
  64. Fermi Gamma-ray Burst Monitor trigger 409187680/131219968 is not a GRB
  65. GRB 131218A: Zadko observatory - Gingin optical candidate
  66. GRB 131218A: TAROT La Silla observatory optical observations
  67. GRB 131218A: a long GRB detected with INTEGRAL
  68. IPN Triangulation of GRB 131216A
  69. GRB 131216A: Fermi GBM observation
  70. GRB 131216A: Fermi-LAT detection of a burst
  71. GRB 131215A: MAXI/GSC detection
  72. Trigger 581129: Swift-BAT triggered on noise
  73. GRB 131205A: GROND confirmation of afterglow
  74. INTEGRAL Weak trigger #6403: AROMA-N Optical Observation
  75. GRB 131209A: Swift XRT and UVOT observations
  76. GRB 131209A: Fermi GBM observation
  77. GRB 131209A Tiled Swift observations
  78. Konus-Wind observation of GRB 131209A
  79. IPN Triangulation of GRB 131209A
  80. GRB 131209A: Fermi-LAT detection of a burst
  81. GRB131202A : GROND observations
  82. GRB131205A : GROND Observations
  83. GRB 131205A: Swift-BAT refined analysis
  84. GRB 131205A: Swift-XRT refined Analysis
  85. Swift Trigger 580319 is not a GRB
  86. GRB 131205A: Swift/UVOT Upper Limits
  87. GRB 131205A: Enhanced Swift-XRT position
  88. GRB 131205A: Zadko observatory - Gingin optical observations
  89. GRB 131205A: Swift detection of a burst
  90. GRB 131127B: Bassano Bresciano Observatory,archival confirmation of iPTF13ecv
  91. GRB 131202A: theoretical estimation of the redshift
  92. GRB 131127B: archival confirmation of iPTF13ecv as a CV
  93. GRB 131127B: rejection of optical counterpart candidates
  94. GRB 131126A: Fermi GBM observation
  95. GRB 131126A: iPTF upper limits on the afterglow of a short GRB
  96. GRB 090530: X-shooter redshift
  97. GRB 131127A: optically dark burst
  98. GRB 131202A, Swift-BAT refined analysis
  99. GRB 131202A: Swift/UVOT Upper Limits
  100. GRB 131202A: Swift-XRT refined Analysis

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