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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"

3045 results found.

  1. GRB 181222B: Global MASTER Net observations of the short bright Fermi GRB error box.
  2. GRB 181213A: Mondy optical observations
  3. GRB 181213A:Insight-HXMT/HE detection
  4. GRB 181213A: Swift detection of a burst
  5. GRB 181201A: continued optical observations in Mondy
  6. GRB 181202A: Swift/UVOT Detection
  7. GRB 181202A: Global MASTER-Net optical observations
  8. GRB 181202A: Enhanced Swift-XRT position
  9. GRB 181202A: Swift detection of a burst with an optical counterpart
  10. GRB 181201A MASTER-Net OT continued observation
  11. Short-duration GRB 181121.4: MASTER-Tavrida possible OT detection near the PGC galaxy during large Fermi error box inspection
  12. GRB 181126A: Swift-BAT refined analysis
  13. GRB 181123B: Keck further near-infrared imaging
  14. Konus-Wind observation of GRB 181121A
  15. Fermi GRB 181105.31: Global MASTER Net optical observations
  16. GRB 181103A: Swift/UVOT Detection
  17. GRB 181026A: AstroSat CZTI detection
  18. IPN Triangulation of GRB 181028A (long)
  19. Konus-Wind observation of GRB 181020A
  20. GRB 181008B: Global MASTER Net optical inspection
  21. GRB 181010A: Swift detection of a burst with an optical counterpart
  22. GRB 181003A: Swift-BAT refined analysis
  23. GRB 181003A: Swift-XRT afterglow detection
  24. GRB 181003A: LCO Cerro Tololo observations
  25. GRB 181003A: Swift-XRT observations
  26. GRB 180914B: GOTO optical detection
  27. IPN Triangulation of GRB 180914A (long)
  28. GRB 180914A: MASTER automatic inspection
  29. GRB 180905A: Swift detection of a burst
  30. Konus-Wind observation of GRB 180828A
  31. GRB 180828A: AstroSat CZTI detection
  32. GRB 180829A/MAXI J0406-019: MAXI/GSC detection
  33. GRB 180828A: Fermi GBM observation
  34. GRB 180828A: Swift detection of a GRB or possible Galactic Transient Swift J1754.9-2548
  35. IPN Triangulation of GRB 180824A (short)
  36. GRB 180809A: MAXI/GSC detection
  37. GRB 180806.94: MASTER possible OT detection in Fermi GMB trigger 555287944 error box
  38. GRB 180728B: MASTER optical observations short GRB IPN error box
  39. GRB 180728A: Swift-BAT refined analysis
  40. GRB 180728A: Swift-XRT observations
  41. GRB 180727A: Swift-BAT refined analysis
  42. GRB 180720C: MASTER optical observation
  43. GRB 180720B: Swift-BAT refined analysis
  44. GRB 180720C: Swift detection of a burst or possible Galactic Transient
  45. GRB 180720B: Kanata 1.5m optical/NIR observation
  46. GRB 180718A: MASTER optical observation
  47. GRB 180718A: Fermi GBM detection
  48. GRB 180718A short GRB detected by IPN and found in ground analysis of BAT data
  49. GRB 180715A: Swift-XRT observations
  50. Konus-Wind observation of GRB 180703B
  51. GRB 180704A: Swift-BAT refined analysis
  52. GRB 180704A: Enhanced Swift-XRT position
  53. GRB 180704A: Swift-XRT observations
  54. GRB 180626C / Fermi trigger 551697835: MASTER inspection
  55. GRB 180626A: Swift-BAT refined analysis
  56. Konus-Wind observation of GRB 180620B
  57. GRB 180620B: Swift-BAT refined analysis
  58. GROND observations of GRB 180620B
  59. GRB 180620B: Enhanced Swift-XRT position
  60. GRB 180620B: Swift detection of a burst with an optical counterpart
  61. GRB 180614A: 1.5m OSN I-band observation
  62. GRB 180614A: MASTER observation
  63. GRB 180614A: Enhanced Swift-XRT position
  64. GRB 180614A: Swift detection of a burst
  65. IPN Triangulation of GRB 180529A (short/hard)
  66. IPN Triangulation of GRB 180526A (long)
  67. GRB 180505A: AstroSat CZTI detection
  68. GRB 180505A: Fermi GBM detection
  69. GRB 180425A: Enhanced Swift-XRT position
  70. GRB 180425A: Swift detection of a burst
  71. GRB 180418A: Swift detection of a short burst
  72. GRB 180402A: Swift detection of a possibly short burst
  73. GRB 180331A: Swift-BAT refined analysis
  74. GRB 180329B: Swift-BAT refined analysis
  75. Swift Trigger 819863 is not a GRB
  76. Konus-Wind observation of GRB 180316A
  77. GRB 180316A: Swift detection of a burst
  78. GRB 180314A: Swift-BAT refined analysis
  79. IPN Triangulation of GRB 180223A (long)
  80. GRB180205A: Optical observations with DOAO 1m telescope
  81. LIGO/Virgo G298048 GRAWITA: VST-ESO PARANAL follow up of AT2017gfo
  82. GRB 180115A: Swift-BAT refined analysis
  83. GRB 180116A: MAXI/GSC detection
  84. GRB 180113A: KAIT Optical Observations
  85. GMRT Radio detection of GRB 171205A
  86. GRB 171212A: Swift detection of a burst or a Galactic transient
  87. GRB 171211A: Swift-BAT refined analysis
  88. Swift Trigger 796115 is probably not a GRB
  89. GRB 171205A: GOTO detection of the optical counterpart
  90. GRB 171120A: Swift-BAT refined analysis
  91. GRB 171112A: MAXI/GSC detection
  92. GRB 171010A: afterglow and SN 2017htp optical observations
  93. GRB 171030A: MASTER inspection of the IPN error box of the short GRB.
  94. GRB 171027A, Swift-BAT refined analysis
  95. GRB 171027A: MASTER-OAFA (Argentina) early prompt optical observations
  96. GRB 171013A: Swift detection of a possible burst
  97. GRB 171007A: Fermi GBM observation
  98. GRB 171007A: Swift detection of a burst
  99. 3.6m Devasthal Optical Telescope observations of GRB 170428A
  100. LIGO/Virgo G297595: NIR Observations following GW170814

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