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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"

5051 results found.

  1. Konus-Wind observation of a bright burst from SGR 1935+2154
  2. Fermi GRB 200421A: Global MASTER-Net observations report
  3. IceCube-200421A: No significant detection in HAWC
  4. IceCube-200421A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  5. Fermi trigger No 608935505: Global MASTER-Net observations report
  6. GRB 200415A: MASTER imspection and possible localisation
  7. Konus-Wind observation of GRB 200415A (a magnetar Giant Flare in Sculptor Galaxy?)
  8. GRB 200416A: Swift-XRT refined Analysis
  9. GRB 200412B: Mondy optical observations
  10. Konus-Wind observation of GRB 200412B
  11. GRB 200412B: Swift-XRT afterglow detection
  12. Fermi GRB 200412A: Global MASTER-Net observations report
  13. Swift GRB 200411A: Global MASTER-Net observations report
  14. GRB 200411A: Swift-XRT refined Analysis
  15. IceCube Alert 200410.97: Global MASTER-Net observations report
  16. Fermi trigger No 608204639: Global MASTER-Net observations report
  17. GRB 200410A: Swift-XRT refined Analysis
  18. Baksan Neutrino Observatory Alert 200408.26: Global MASTER-Net observations report
  19. Baksan Neutrino Observatory Alert 200409.23: Global MASTER-Net observations report
  20. GRB 200409A: Swift-XRT refined Analysis
  21. Fermi GRB 200407B: Global MASTER-Net observations report
  22. Fermi GRB 200403A: Global MASTER-Net observations report
  23. LIGO/Virgo S200224ca: Upper limits from Konus-Wind observations
  24. Fermi GRB 200402C: Global MASTER-Net observations report
  25. Fermi GRB 200402A: Global MASTER-Net observations report
  26. Fermi GRB 200401A: Global MASTER-Net observations report
  27. IPN triangulation of GRB 200327A (short)
  28. GRB 200326B: AstroSat LAXPC detection
  29. Fermi trigger No 606799116: Global MASTER-Net observations report
  30. GRB 200326A: Fermi GBM Final Real-time Localization
  31. GRB 200324A: AROMA-N Optical Observation
  32. Fermi trigger No 606840801: Global MASTER-Net observations report
  33. GRB 200324A:: TSHAO optical upper limit
  34. GRB 200324A: Swift-XRT refined Analysis
  35. Swift GRB200324.69: Global MASTER-Net observations report
  36. Fermi trigger No 606681997: Global MASTER-Net observations report
  37. LIGO/Virgo S200316bj : No significant candidates in TAROT - FRAM - GRANDMA observations.
  38. LIGO/Virgo S200316bj: no counterpart candidate in SVOM/GWAC observations
  39. LIGO/Virgo S200316bj: No neutrino candidates at Pierre Auger Observatory
  40. LIGO/Virgo S200316bj: No Counterparts in DDOTI/OAN Optical Observations
  41. LIGO/Virgo S200316bj: Coverage and upper limits from MAXI/GSC observations
  42. IPN triangulation of GRB 200313A
  43. Fermi trigger No 605756501: Global MASTER-Net observations report
  44. LIGO/Virgo S200224ca: DESGW Summary of DECam Observations
  45. GRB 200310A: MAXI/GSC detection
  46. Fermi trigger No 605309224: Global MASTER-Net observations report
  47. GRB 200306C: Swift-XRT refined Analysis
  48. GRB 200306A: Swift-XRT refined Analysis
  49. LIGO/Virgo S200302c : No significant candidates in FRAM - TAROT - GRANDMA observations.
  50. Swift GRB200306.01: Global MASTER-Net observations report
  51. GRB 200303A: Swift-XRT refined Analysis
  52. LIGO/Virgo S200302c: No counterpart candidates in KAIT observations
  53. LIGO/Virgo S200302c: Coverage and upper limits from MAXI/GSC observations
  54. GRB 200228B: Mondy, TSHAO, AbAO and CrAO optical observations, afterglow candidate
  55. LIGO/Virgo S200225q : No significant candidates in TAROT - FRAM - GRANDMA observations.
  56. GRB 200228B: Swift-XRT refined Analysis
  57. GRB 200227A: Swift-XRT refined Analysis
  58. GRB 200224A: Mondy optical upper limit
  59. GRB 200227A: Fermi GBM observation
  60. LIGO/Virgo S200224ca : No significant candidates in TAROT - FRAM - GRANDMA observations
  61. LIGO/Virgo S200224ca: Upper limits from CALET observations.
  62. LIGO/Virgo S200225q: no counterpart candidate in SVOM/GWAC observations
  63. GRB 200224B: DDOTI/OAN optical observations report
  64. LIGO/Virgo S200224ca: No counterpart candidates in KAIT observations
  65. LIGO/Virgo S200224ca: GRAWITA-Campo Imperatore observations.
  66. Fermi trigger No 604231129: Global MASTER-Net observations report
  67. LIGO/Virgo S200224ca: Subaru/Hyper Suprime-Cam follow-up observations
  68. LIGO/Virgo S200224ca: No counterpart candidates in Fermi-LAT observations
  69. LIGO/Virgo S200225q: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  70. LIGO/Virgo S200224ca: upper limits from AGILE/GRID observations
  71. GRB 200224A: LCO Upper Limits
  72. LIGO/Virgo S200224ca: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  73. LIGO/Virgo S200224ca: Coverage and upper limits from MAXI/GSC observations
  74. LIGO/Virgo S200224ca: upper limits from AGILE/MCAL observations
  75. LIGO/Virgo S200224ca: Global MASTER-Net observations report
  76. LIGO/Virgo S200224ca: Upper limits from IceCube neutrino searches
  77. LIGO/Virgo S200224ca: Identification of a GW compact binary merger candidate The LIGO Scientific Collaboration and the Virgo Collaboration
  78. Correction in name: GRB 200224B and GRB 200224C (not GRB 200224A)
  79. GRB 200224A: Swift-XRT refined Analysis
  80. GRB 200224C: Fermi GBM Final Real-time Localization
  81. GRB 200224A: Tautenburg observations
  82. Fermi trigger No 604213554: Global MASTER-Net observations report
  83. GRB 200224B: Fermi GBM Final Real-time Localization
  84. GRB 200224A: Swift detection of a burst
  85. Swift GRB200224.14: Global MASTER-Net observations report
  86. LIGO/Virgo S200219ac: no counterpart candidate in SVOM/GWAC-F30 observations
  87. LIGO/Virgo S200219ac: no counterpart candidate in SVOM/GWAC observations
  88. LIGO/Virgo S200219ac : No significant candidates in TAROT - FRAM - GRANDMA observations.
  89. LIGO/Virgo S200219ac: No counterpart candidates in KAIT observations
  90. GRB 200219C: Fermi GBM Final Real-time Localization
  91. GRB 200219A: Swift-XRT refined Analysis correction
  92. GRB 200216B: Swift-XRT refined Analysis
  93. LIGO/Virgo S200213t : No significant candidates in FRAM - OAJ - TAROT - GRANDMA observations
  94. GRB 200216A: Swift/BAT detection and arcminute localization from GUANO
  95. GRB 200215A: Swift-XRT refined Analysis
  96. GRB 200215A: Fermi GBM detection
  97. LIGO/Virgo S200213t: No neutrino candidates at Pierre Auger Observatory
  98. LIGO/Virgo S200213t: No counterpart candidates in KAIT observations
  99. LIGO/Virgo S200213t: No Counterparts in DDOTI/OAN Optical Observations
  100. LIGO/Virgo S200208q : No significant candidates in TAROT - FRAM - GRANDMA observations

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