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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"

2988 results found.

  1. LIGO/Virgo S190408an: GRAWITA optical observations of MASTER OT J231043.63+470956.4
  2. GRB 190404C: MITSuME Akeno and Okayama optical upper limits
  3. GRB 140404C: MAXI/GSC detection
  4. GRB 190330A: MITSuME Akeno and Okayama optical upper limits
  5. Trigger 896552: Swift detection of PSR B1055-52
  6. Swift Trigger 895479: Detection of GRO J2058+42
  7. GRB 190326A: Swift-BAT refined analysis - a soft-short GRB or an SGR
  8. Swift Trigger 895257: Detection of GRO J2058+42 in outburst
  9. Fermi Trigger 575251142 / GRB 190325999 / GRB 190325A: BALROG localization
  10. SWIFT GRB190323.85 Global MASTER-Net observations report
  11. Swift Trigger 894268: Detection of GRO J2058+42 in outburst
  12. GRB 190220A: Swift-BAT refined analysis
  13. GRB 190219A: NEXT-0.6m optical upper limit
  14. GRB190219A: MASTER Global Robotic Net optical observation
  15. GRB 190211A: Swift detection of a burst
  16. GRB 190204A: COATLI Optical Detection of the Fading Afterglow
  17. GRB 190129B: MASTER Global Robotic Net optical observation
  18. GRB 190122B: AstroSat CZTI detection
  19. Trigger 884906: Swift detection of MAXI J1631-479
  20. Konus-Wind observation of GRB 190114C
  21. GRB 190114C: LSGT optical observation
  22. GRB 190114C:Insight-HXMT/HE detection
  23. GRB 190114C: SPI-ACS/INTEGRAL extended emission detection
  24. GRB 190114C: AGILE/MCAL detection
  25. GRB190109B: MITSuME Akeno optical upper limits
  26. GRB 190114C: Fermi-LAT detection
  27. GRB 190114C: Fermi GBM detection
  28. MAGIC detects the GRB 190114C in the TeV energy domain
  29. GRB 190114B: Mondy optical afterglow detection
  30. GRB 190114C: MASTER 4-polarizations filters OT detection
  31. GRB 190114C: MASTER afterglow Detection
  32. GRB 190114C: Swift detection of a very bright burst with a bright optical counterpart
  33. GRB 190106A: GMG continued observation
  34. GRB 190109B: COATLI Optical Observations
  35. GRB 190109A: Swift-BAT refined analysis
  36. GRB 190109B: Swift-XRT observations
  37. GRB 190109B: Swift detection of a burst
  38. GRB 190106A : continued TSHAO optical observations
  39. GRB 190106A: NEXT-0.6m and Xinglong-2.16m photometric single powerlaw decay
  40. GRB 190106A: Swift-BAT refined analysis
  41. IceCube-190104A: MASTER optical observation
  42. GRB 190103B: Swift-BAT refined analysis
  43. Swift Trigger 880127 is not a GRB
  44. GRB 181222B: Global MASTER Net observations of the short bright Fermi GRB error box.
  45. GRB 181213A: Mondy optical observations
  46. GRB 181213A:Insight-HXMT/HE detection
  47. GRB 181213A: Swift detection of a burst
  48. GRB 181201A: continued optical observations in Mondy
  49. GRB 181202A: Swift/UVOT Detection
  50. GRB 181202A: Global MASTER-Net optical observations
  51. GRB 181202A: Enhanced Swift-XRT position
  52. GRB 181202A: Swift detection of a burst with an optical counterpart
  53. GRB 181201A MASTER-Net OT continued observation
  54. Short-duration GRB 181121.4: MASTER-Tavrida possible OT detection near the PGC galaxy during large Fermi error box inspection
  55. GRB 181126A: Swift-BAT refined analysis
  56. GRB 181123B: Keck further near-infrared imaging
  57. Konus-Wind observation of GRB 181121A
  58. Fermi GRB 181105.31: Global MASTER Net optical observations
  59. GRB 181103A: Swift/UVOT Detection
  60. GRB 181026A: AstroSat CZTI detection
  61. IPN Triangulation of GRB 181028A (long)
  62. Konus-Wind observation of GRB 181020A
  63. GRB 181008B: Global MASTER Net optical inspection
  64. GRB 181010A: Swift detection of a burst with an optical counterpart
  65. GRB 181003A: Swift-BAT refined analysis
  66. GRB 181003A: Swift-XRT afterglow detection
  67. GRB 181003A: LCO Cerro Tololo observations
  68. GRB 181003A: Swift-XRT observations
  69. GRB 180914B: GOTO optical detection
  70. IPN Triangulation of GRB 180914A (long)
  71. GRB 180914A: MASTER automatic inspection
  72. GRB 180905A: Swift detection of a burst
  73. Konus-Wind observation of GRB 180828A
  74. GRB 180828A: AstroSat CZTI detection
  75. GRB 180829A/MAXI J0406-019: MAXI/GSC detection
  76. GRB 180828A: Fermi GBM observation
  77. GRB 180828A: Swift detection of a GRB or possible Galactic Transient Swift J1754.9-2548
  78. IPN Triangulation of GRB 180824A (short)
  79. GRB 180809A: MAXI/GSC detection
  80. GRB 180806.94: MASTER possible OT detection in Fermi GMB trigger 555287944 error box
  81. GRB 180728B: MASTER optical observations short GRB IPN error box
  82. GRB 180728A: Swift-BAT refined analysis
  83. GRB 180728A: Swift-XRT observations
  84. GRB 180727A: Swift-BAT refined analysis
  85. GRB 180720C: MASTER optical observation
  86. GRB 180720B: Swift-BAT refined analysis
  87. GRB 180720C: Swift detection of a burst or possible Galactic Transient
  88. GRB 180720B: Kanata 1.5m optical/NIR observation
  89. GRB 180718A: MASTER optical observation
  90. GRB 180718A: Fermi GBM detection
  91. GRB 180718A short GRB detected by IPN and found in ground analysis of BAT data
  92. GRB 180715A: Swift-XRT observations
  93. Konus-Wind observation of GRB 180703B
  94. GRB 180704A: Swift-BAT refined analysis
  95. GRB 180704A: Enhanced Swift-XRT position
  96. GRB 180704A: Swift-XRT observations
  97. GRB 180626C / Fermi trigger 551697835: MASTER inspection
  98. GRB 180626A: Swift-BAT refined analysis
  99. Konus-Wind observation of GRB 180620B
  100. GRB 180620B: Swift-BAT refined analysis

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