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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"

45702 results found.

  1. GRB 140105A: HCT Observations
  2. GRB 140105A: continued iPTF observations and rejection of optical candidates
  3. Swift-BAT triggered on KS 1947+300
  4. GRB 140105A: Swift XRT observations
  5. GRB 140103A: Swift XRT afterglow confirmation
  6. GRB 140105A/Fermi410578384: MASTER-Net early optical observations
  7. GRB 140104B: Swift XRT observations
  8. GRB 140102A: Swift/UVOT Detection
  9. LOAO R-band Observation of GRB 140102A
  10. GRB 140105A: Fermi GBM detection
  11. GRB 140104B: Fermi GBM observation
  12. Fermi410578384: iPTF optical afterglow candidates for a possible short GRB
  13. GRB 140102A: BOOTES-4 early optical observations
  14. GRB 140104B: Fermi-LAT detection of a burst
  15. GRB 131209A: Further Swift XRT observations
  16. GRB 140103A: Lulin Optical r-band Observations
  17. GRB 131231A : Lulin Optical Observations
  18. GRB 131231A: CARMA 3mm detection
  19. Swift-BAT trigger 582894 is HR 1099 (Flare star)
  20. GRB140104A : Xinglong TNT observation. A bright star is located nearby
  21. GRB 140102A, Optical Observations
  22. GRB 131231A, Optical Observations
  23. GRB 140103A: P60 Observations
  24. GRB 140102A: P60 observations
  25. GRB 131231A: Swift/UVOT Observations of the Optical Afterglow
  26. GRB 131231A: Fermi GBM correction to GCN 15644
  27. GRB 140103A: Swift/UVOT Upper Limits
  28. Konus-Wind observation of GRB 131231A
  29. GRB 140102A: Fermi/GBM Observation
  30. GRB 131229A: Suzaku WAM observation of the prompt emission
  31. Konus-Wind observation of GRB 140102A
  32. GRB 140103A: Swift-XRT refined analysis
  33. GRB 140102A: GROND observations
  34. GRB 140103A, Swift-BAT refined analysis
  35. GRB 140102A: MAXI/GSC detection
  36. GRB 140102A, Swift-BAT refined analysis
  37. GRB 140102A: Swift-XRT refined Analysis
  38. GRB 140103A: MASTER-Net optical observations
  39. GRB 140102A: Fermi-LAT detection of a burst
  40. GRB 140102A: I-band observations from IAC80 and 1.23m CAHA telescopes
  41. GRB 140102A: Enhanced Swift-XRT position
  42. GRB 140103A: Swift detection of a burst
  43. GRB 140102A: Early optical observations from Nanshan
  44. GRB 131224B detected in ground analysis of Swift-BAT data
  45. GRB 140102A: Swift detection of a burst with optical counterpart
  46. GRB 131231A: Gemini-South Redshift
  47. GRB 131229A: Fermi GBM detection
  48. GRB 131231A: P60 observations
  49. GRB 131227A: KAIT light curve analysis
  50. GRB 131231A: Swift-XRT observations
  51. GRB 131231A : xinglong TNT optical observation
  52. GRB 131231A: MDM afterglow observation
  53. GRB 131231A: VLT/X-shooter redshift
  54. GRB 131231A: Fermi GBM detection
  55. GRB 131231A: iPTF optical afterglow candidate coincident with Nanshan detection
  56. GRB 131231A: afterglow confirmation from the NOT
  57. GRB 131231A: Nanshan afterglow candidate
  58. GRB 131231A: Fermi-LAT detection of a burst
  59. Konus-Wind observation of GRB 131229A
  60. GRB 131229A: CARMA 3mm observations
  61. GRB 131229A: Magellan upper limit
  62. GRB 131229A: GROND observations
  63. GRB 131229A: Swift-BAT refined analysis
  64. GRB 131229A: Swift-XRT refined Analysis
  65. GRB 131229A: Swift/UVOT Upper Limits
  66. GRB 131227A: GROND Upper Limits
  67. GRB 131229A: Enhanced Swift-XRT position
  68. GRB 131229A: Deep Gemini-South Imaging
  69. GRB 131229A: KAIT Optical Upper Limit
  70. GRB 131229A: P60 nondetection
  71. GRB 131229A: Swift detection of a burst
  72. GRB 131224A: 5.8 GHz VLA observations
  73. GRB 131227A: P60 Limits
  74. GRB 131227A: Gemini-North Redshift
  75. GRB 131227A: Swift-XRT refined Analysis
  76. GRB 131227A: Xinglong optical observations
  77. GRB 131227A: Swift/UVOT Upper Limits
  78. GRB 131227A: Swift-BAT refined analysis
  79. Konus-Wind observation of GRB 131226A
  80. GRB 131227A: Enhanced Swift-XRT position
  81. GRB 131227A: OT candidate from KAIT Optical observations
  82. GRB 131227A: Swift detection of a burst
  83. GRB 131224A: Swift/UVOT Upper Limits
  84. GRB 131225A: MASTER-Net optical observations
  85. GRB 131226A, Swift-BAT refined analysis
  86. GRB 131226A: Swift detection of a burst
  87. GRB 131216A: Suzaku WAM observation of the prompt emission
  88. GRB 131224A: Swift-XRT observation
  89. GRB 131225A: MAXI/GSC detection
  90. GRB 131224A: MASTER-Net early optical observations
  91. GRB 131224A: A short GRB detected by INTEGRAL
  92. GRB 131218A: GROND Upper Limits
  93. GRB 131218A: Swift XRT and UVOT observations
  94. Fermi Gamma-ray Burst Monitor trigger 409187680/131219968 is not a GRB
  95. GRB 131218A: Zadko observatory - Gingin optical candidate
  96. GRB 131218A: TAROT La Silla observatory optical observations
  97. GRB 131218A: a long GRB detected with INTEGRAL
  98. IPN Triangulation of GRB 131216A
  99. GRB 131216A: Fermi GBM observation
  100. GRB 131216A: Fermi-LAT detection of a burst

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