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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"

45782 results found.

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

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