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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

2974 results found.

  1. GRB 190211A: Swift detection of a burst
  2. GRB 190204A: COATLI Optical Detection of the Fading Afterglow
  3. GRB 190129B: MASTER Global Robotic Net optical observation
  4. GRB 190122B: AstroSat CZTI detection
  5. Trigger 884906: Swift detection of MAXI J1631-479
  6. Konus-Wind observation of GRB 190114C
  7. GRB 190114C: LSGT optical observation
  8. GRB 190114C:Insight-HXMT/HE detection
  9. GRB 190114C: SPI-ACS/INTEGRAL extended emission detection
  10. GRB 190114C: AGILE/MCAL detection
  11. GRB190109B: MITSuME Akeno optical upper limits
  12. GRB 190114C: Fermi-LAT detection
  13. GRB 190114C: Fermi GBM detection
  14. MAGIC detects the GRB 190114C in the TeV energy domain
  15. GRB 190114B: Mondy optical afterglow detection
  16. GRB 190114C: MASTER 4-polarizations filters OT detection
  17. GRB 190114C: MASTER afterglow Detection
  18. GRB 190114C: Swift detection of a very bright burst with a bright optical counterpart
  19. GRB 190106A: GMG continued observation
  20. GRB 190109B: COATLI Optical Observations
  21. GRB 190109A: Swift-BAT refined analysis
  22. GRB 190109B: Swift-XRT observations
  23. GRB 190109B: Swift detection of a burst
  24. GRB 190106A : continued TSHAO optical observations
  25. GRB 190106A: NEXT-0.6m and Xinglong-2.16m photometric single powerlaw decay
  26. GRB 190106A: Swift-BAT refined analysis
  27. IceCube-190104A: MASTER optical observation
  28. GRB 190103B: Swift-BAT refined analysis
  29. Swift Trigger 880127 is not a GRB
  30. GRB 181222B: Global MASTER Net observations of the short bright Fermi GRB error box.
  31. GRB 181213A: Mondy optical observations
  32. GRB 181213A:Insight-HXMT/HE detection
  33. GRB 181213A: Swift detection of a burst
  34. GRB 181201A: continued optical observations in Mondy
  35. GRB 181202A: Swift/UVOT Detection
  36. GRB 181202A: Global MASTER-Net optical observations
  37. GRB 181202A: Enhanced Swift-XRT position
  38. GRB 181202A: Swift detection of a burst with an optical counterpart
  39. GRB 181201A MASTER-Net OT continued observation
  40. Short-duration GRB 181121.4: MASTER-Tavrida possible OT detection near the PGC galaxy during large Fermi error box inspection
  41. GRB 181126A: Swift-BAT refined analysis
  42. GRB 181123B: Keck further near-infrared imaging
  43. Konus-Wind observation of GRB 181121A
  44. Fermi GRB 181105.31: Global MASTER Net optical observations
  45. GRB 181103A: Swift/UVOT Detection
  46. GRB 181026A: AstroSat CZTI detection
  47. IPN Triangulation of GRB 181028A (long)
  48. Konus-Wind observation of GRB 181020A
  49. GRB 181008B: Global MASTER Net optical inspection
  50. GRB 181010A: Swift detection of a burst with an optical counterpart
  51. GRB 181003A: Swift-BAT refined analysis
  52. GRB 181003A: Swift-XRT afterglow detection
  53. GRB 181003A: LCO Cerro Tololo observations
  54. GRB 181003A: Swift-XRT observations
  55. GRB 180914B: GOTO optical detection
  56. IPN Triangulation of GRB 180914A (long)
  57. GRB 180914A: MASTER automatic inspection
  58. GRB 180905A: Swift detection of a burst
  59. Konus-Wind observation of GRB 180828A
  60. GRB 180828A: AstroSat CZTI detection
  61. GRB 180829A/MAXI J0406-019: MAXI/GSC detection
  62. GRB 180828A: Fermi GBM observation
  63. GRB 180828A: Swift detection of a GRB or possible Galactic Transient Swift J1754.9-2548
  64. IPN Triangulation of GRB 180824A (short)
  65. GRB 180809A: MAXI/GSC detection
  66. GRB 180806.94: MASTER possible OT detection in Fermi GMB trigger 555287944 error box
  67. GRB 180728B: MASTER optical observations short GRB IPN error box
  68. GRB 180728A: Swift-BAT refined analysis
  69. GRB 180728A: Swift-XRT observations
  70. GRB 180727A: Swift-BAT refined analysis
  71. GRB 180720C: MASTER optical observation
  72. GRB 180720B: Swift-BAT refined analysis
  73. GRB 180720C: Swift detection of a burst or possible Galactic Transient
  74. GRB 180720B: Kanata 1.5m optical/NIR observation
  75. GRB 180718A: MASTER optical observation
  76. GRB 180718A: Fermi GBM detection
  77. GRB 180718A short GRB detected by IPN and found in ground analysis of BAT data
  78. GRB 180715A: Swift-XRT observations
  79. Konus-Wind observation of GRB 180703B
  80. GRB 180704A: Swift-BAT refined analysis
  81. GRB 180704A: Enhanced Swift-XRT position
  82. GRB 180704A: Swift-XRT observations
  83. GRB 180626C / Fermi trigger 551697835: MASTER inspection
  84. GRB 180626A: Swift-BAT refined analysis
  85. Konus-Wind observation of GRB 180620B
  86. GRB 180620B: Swift-BAT refined analysis
  87. GROND observations of GRB 180620B
  88. GRB 180620B: Enhanced Swift-XRT position
  89. GRB 180620B: Swift detection of a burst with an optical counterpart
  90. GRB 180614A: 1.5m OSN I-band observation
  91. GRB 180614A: MASTER observation
  92. GRB 180614A: Enhanced Swift-XRT position
  93. GRB 180614A: Swift detection of a burst
  94. IPN Triangulation of GRB 180529A (short/hard)
  95. IPN Triangulation of GRB 180526A (long)
  96. GRB 180505A: AstroSat CZTI detection
  97. GRB 180505A: Fermi GBM detection
  98. GRB 180425A: Enhanced Swift-XRT position
  99. GRB 180425A: Swift detection of a burst
  100. GRB 180418A: Swift detection of a short burst

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