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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"

41750 results found.

  1. GRB 150309A: AAO optic upper limit
  2. GRB 150311A: Konus-Wind trigger at 16:16:24 is not a GRB
  3. GRB 150311A: MAXI/GSC possible afterglow detection
  4. GRB 150222A: CrAO optical observation
  5. Konus-Wind observation of GRB 150309A
  6. GRB 150309A: CrAO optic upper limit
  7. GRB 150309A: ISON-Kislovodsk optic upper limit
  8. Fermi GBM trigger 150311331 is not a GRB
  9. GRB 150309A: Swift-BAT refined analysis
  10. GRB 150309A: Fermi GBM detection
  11. GRB150309A: Optical observations at Crni Vrh
  12. GRB 150309A: Swift/UVOT Upper Limits
  13. GRB 150309A: MASTER prompt optical observation
  14. GRB 150309A: Swift-XRT refined Analysis
  15. GRB 150309A : Liverpool Telescope observations
  16. GRB 150309A: BOOTES-1 and -2 upper limit
  17. GRB 150309A: Swift detection of a burst
  18. GRB 150305A: a long GRB detected by INTEGRAL
  19. GRB 150305A: Swift XRT confirms weak INTEGRAL event as a new GRB
  20. Fermi GBM trigger 150307942 is not a GRB
  21. Chandra X-ray observations of SWIFT J0045.2+4151 (aka Sw J0045 aka GRB 150301C aka p[PFH2005] 622)
  22. Swift J0045.2+4151: analysis of XMM-Newton archival data
  23. Further UVOT Observations of Swift J0045.2+4151
  24. Fermi GBM trigger 150305751 is not a GRB
  25. GRB 150301C: VLA Observations
  26. Further X-ray observations of Swift J0045.2+4151 (aka Sw J0045 aka GRB 150301C aka [PFH2005] 622)
  27. BAT trigger 633105 (GRB 150301C): NOT r-band upper limit
  28. GRB 150302A: BOOTES-2/TELMA upper limit
  29. Trigger 633105 (aka GRB150301C): Swift/UVOT Observations of XRT Counterpart
  30. GRB 150302A: Mondy optical upper limit
  31. GRB 150302A, Swift-BAT refined analysis
  32. GRB 150302A: Swift/UVOT Upper Limits
  33. GRB 150302A: MITSuME Okayama upper limits
  34. GRB 150301C: XRT detection of a potential counterpart of BAT trigger 633105
  35. GRB 150302A: Swift-XRT refined Analysis
  36. GRB 150301B: Swift-XRT refined Analysis
  37. GRB 150220A: further Swift-XRT observations
  38. GRB 150301B: Swift/UVOT Observations
  39. GRB 150301B: LCOGT-Sutherland observations
  40. GRB 150302A: KAIT Optical Upper Limit
  41. GRB 150302A: UVOT Observations
  42. GRB 150302A: NOT afterglow candidate
  43. GRB 150302A: Swift detection of a burst
  44. GRB 150301B: Fermi GBM detection
  45. GRB 150301B: Swift-BAT refined analysis
  46. GRB 150301B: X-shooter spectroscopy
  47. GRB 150301B: GROND afterglow observations
  48. GRB 150301A: Swift/UVOT Upper Limits
  49. GRB 150301A: Swift-BAT refined analysis
  50. GRB 150301B: MASTER early OT detection
  51. GRB 150301A: Swift-XRT refined Analysis
  52. GRB 150301C : (Swift trigger 633105) Swift observations
  53. GRB 150301B: Swift detection of a burst with an optical afterglow
  54. Swift Trigger 633173 is probably not an astrophysical source
  55. GRB 150301A: GROND Observations
  56. Trigger 633105 is likely not a GRB
  57. GRB 150301A: Fermi GBM observation
  58. GRB 150301A: Swift detection of a short burst or new SGR
  59. Swift-BAT refined analysis of magnetar 4U 0142+61 (Trigger 632888)
  60. Fermi GBM Observations of Magnetar 4U 0142+61
  61. Trigger 632888: Swift detection of the magnetar 4U 0142+61
  62. GRB 150222A: Further GROND Observations
  63. GRB 150220A: Fermi GBM observation
  64. Konus-Wind observation of GRB 150220A
  65. IPN Triangulation of GRB 150220A
  66. GRB 150220A: Swift ToO observations
  67. GRB 150222A: I-band observations from OSN
  68. GRB 150222A: Swift/UVOT Upper Limits
  69. GRB 150222A: Swift-XRT refined Analysis
  70. GRB 150222B: MAXI/GSC detection
  71. Fermi GBM Observations of SGR 1935+2154
  72. GRB 150222A: GROND optical afterglow candidate
  73. GRB 150222A: TNG optical observations
  74. Fermi GBM trigger 150223068 is not a GRB
  75. GRB 150222A: Swift-BAT refined analysis
  76. SGR 1935+2154: Swift-BAT refined analysis
  77. GRB 150222A: Mondy optical observations
  78. GRB 150222A: Zadko observatory - Gingin optical observations
  79. GRB 150222A: MASTER early optical observations
  80. GRB 150222A: Swift detection of a burst
  81. Swift detection of an outburst from SGR 1935+2154
  82. GRB 150213B, the review of the sky area in plate archives
  83. Trigger 631946: Swift detection of H1745-203
  84. Fermi GBM trigger 150220229 is not a GRB
  85. GRB 150219A: Fermi GBM observation
  86. GRB 150219A: Swift-XRT afterglow detection
  87. Trigger 631747: Swift detection of 4U 0614+09
  88. GRB 150213B: AAO photometry
  89. GRB 150219A: Swift ToO observations
  90. GRB 150219A: A long GRB detected by INTEGRAL
  91. GRB 150213B: P60 Observations
  92. GRB 150212A, the review of the sky area in plate archives
  93. GRB 150213B: Swift/UVOT Detection
  94. GRB 150213B: Swift-BAT refined analysis
  95. GRB 150213B: RATIR Optical and NIR Observations
  96. GRB 150213B: Swift-XRT refined Analysis
  97. GRB 150213B: AAO optical observations
  98. GRB 150213B: optical detection from the NOT
  99. GRB 150212A: Swift/UVOT Observations
  100. GRB 150213B: Tautenburg Afterglow Detection

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