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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"

23611 results found.

  1. GRB 140110A: Swift XRT observations
  2. GRB 140108A: Mondy optical upper limit
  3. GRB 140105A: MASTER-Net early optical observations and time correction
  4. GRB 131231A: AAO optical observations
  5. GRB 140108A: Swift-BAT refined analysis
  6. GRB 140108A: Swift/UVOT Detection
  7. GRB 140108A: theoretical prediction of redshift and of supernova occurrence
  8. GRB 140108A: Enhanced Swift-XRT position
  9. GRB 140108A: Mondy optical observations
  10. GRB 140108A: D50+BART optical candidate detection
  11. GRB 140108A: 1.23m CAHA observations
  12. GRB 140108A: Swift detection of a burst
  13. GRB 140105A: HCT Observations
  14. Swift-BAT triggered on KS 1947+300
  15. GRB 140105A: Swift XRT observations
  16. GRB 140105A/Fermi410578384: MASTER-Net early optical observations
  17. GRB 140104B: Swift XRT observations
  18. GRB 140102A: Swift/UVOT Detection
  19. LOAO R-band Observation of GRB 140102A
  20. GRB 140105A: Fermi GBM detection
  21. Fermi410578384: iPTF optical afterglow candidates for a possible short GRB
  22. GRB 131209A: Further Swift XRT observations
  23. GRB 140103A: Lulin Optical r-band Observations
  24. GRB 140102A, Optical Observations
  25. GRB 140103A: P60 Observations
  26. GRB 140102A: P60 observations
  27. GRB 131231A: Swift/UVOT Observations of the Optical Afterglow
  28. GRB 140103A: Swift/UVOT Upper Limits
  29. GRB 140102A: GROND observations
  30. GRB 140102A: Swift-XRT refined Analysis
  31. GRB 140102A: Fermi-LAT detection of a burst
  32. GRB 140102A: Enhanced Swift-XRT position
  33. GRB 140103A: Swift detection of a burst
  34. GRB 140102A: Early optical observations from Nanshan
  35. GRB 131224B detected in ground analysis of Swift-BAT data
  36. GRB 140102A: Swift detection of a burst with optical counterpart
  37. GRB 131231A: P60 observations
  38. GRB 131231A: MDM afterglow observation
  39. GRB 131231A: Fermi GBM detection
  40. GRB 131231A: Nanshan afterglow candidate
  41. GRB 131231A: Fermi-LAT detection of a burst
  42. GRB 131229A: Magellan upper limit
  43. GRB 131229A: GROND observations
  44. GRB 131229A: Swift/UVOT Upper Limits
  45. GRB 131227A: GROND Upper Limits
  46. GRB 131229A: Enhanced Swift-XRT position
  47. GRB 131229A: Deep Gemini-South Imaging
  48. GRB 131229A: Swift detection of a burst
  49. GRB 131224A: 5.8 GHz VLA observations
  50. GRB 131227A: Swift-XRT refined Analysis
  51. GRB 131227A: Xinglong optical observations
  52. GRB 131227A: Swift/UVOT Upper Limits
  53. GRB 131227A: Enhanced Swift-XRT position
  54. GRB 131227A: Swift detection of a burst
  55. GRB 131224A: Swift/UVOT Upper Limits
  56. GRB 131225A: MASTER-Net optical observations
  57. GRB 131226A: Swift detection of a burst
  58. GRB 131224A: Swift-XRT observation
  59. GRB 131224A: MASTER-Net early optical observations
  60. GRB 131218A: GROND Upper Limits
  61. GRB 131218A: Swift XRT and UVOT observations
  62. GRB 131218A: Zadko observatory - Gingin optical candidate
  63. GRB 131218A: TAROT La Silla observatory optical observations
  64. IPN Triangulation of GRB 131216A
  65. GRB 131216A: Fermi GBM observation
  66. GRB 131216A: Fermi-LAT detection of a burst
  67. Trigger 581129: Swift-BAT triggered on noise
  68. GRB 131205A: GROND confirmation of afterglow
  69. INTEGRAL Weak trigger #6403: AROMA-N Optical Observation
  70. GRB 131209A: Swift XRT and UVOT observations
  71. Konus-Wind observation of GRB 131209A
  72. IPN Triangulation of GRB 131209A
  73. GRB131202A : GROND observations
  74. GRB131205A : GROND Observations
  75. GRB 131205A: Swift/UVOT Upper Limits
  76. GRB 131205A: Enhanced Swift-XRT position
  77. GRB 131205A: Zadko observatory - Gingin optical observations
  78. GRB 131205A: Swift detection of a burst
  79. GRB 131202A: theoretical estimation of the redshift
  80. GRB 131127B: archival confirmation of iPTF13ecv as a CV
  81. GRB 131127B: rejection of optical counterpart candidates
  82. GRB 131126A: iPTF upper limits on the afterglow of a short GRB
  83. GRB 131127A: optically dark burst
  84. GRB 131202A: Swift/UVOT Upper Limits
  85. GRB 131202A: RATIR Optical and NIR Observations
  86. GRB 131202A: Enhanced Swift-XRT position
  87. GRB 131202A: Bassano Bresciano Observatory optical upper limit
  88. GRB 131202A: Tautenburg observations
  89. GRB 060614: theoretical derivation of the redshift and need for deeper search of the host galaxy
  90. GRB 131202A: Swift detection of a burst
  91. GRB 131127B: Bassano Bresciano Observatory optical observations of iPTF13ecv
  92. GRB 131122A: Swift-XRT Further Observation
  93. GRB 131128A: Bassano Bresciano Observatory optical upper limit
  94. GRB 131127A: RATIR Rejection of High-z Candidate
  95. GRB 131125A: MASTER-Net very early optical observations
  96. GRB 131125A: iPTF upper limits on the afterglow of a short GRB
  97. IPN Triangulation of GRB 131126A (short/hard)
  98. Konus-Wind observation of GRB 131125A
  99. GRB 131127A: CQUEAN riz Observation
  100. GRB 131128A: GROND observations of the afterglow

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