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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"

2983 results found.

  1. Fermi trigger No 583567803 Global MASTER-Net observations report
  2. GRB 190627A: Koshka Zeiss-1000 optical counterpart observations
  3. Fermi trigger No 583327924 Global MASTER-Net observations report
  4. Fermi trigger No 582856902 Global MASTER-Net observations report
  5. Fermi trigger No 582759998 Global MASTER-Net observations report
  6. Fermi trigger No 582615488 Global MASTER-Net observations report
  7. Fermi trigger No 582115625 Global MASTER-Net observations report
  8. IPN Triangulation of GRB 190611B
  9. GRB 190612A: Fermi GBM Final Real-time Localization
  10. Fermi trigger No 581889628 Global MASTER-Net observations report
  11. GRB 190610A: Swift detection of a short burst
  12. Fermi trigger No 581645543 Global MASTER-Net observations report
  13. IPN Triangulation of GRB 190606A (short)
  14. GRB 190604B: BOOTES-3 early optical limits
  15. GRB 190604B: Swift detection of a burst
  16. LIGO/Virgo S190602aq: No counterpart candidates in HAWC observations
  17. GRB 190530A: Mondy and AbAO optical observations
  18. GRB 190531B: VLT optical upper limit
  19. GRB 190531B: MASTER optical observation
  20. GRB 190531B: Swift-XRT afterglow detection
  21. LIGO/Virgo S190425z: No counterpart candidate in Zadko-GRANDMA observations.
  22. LIGO/Virgo S190521r : Gaia Photometric Alerts transient candidate
  23. LIGO/Virgo S190521r: CNEOST follow-up observations
  24. Fermi GRB190525.67 Global MASTER-Net observations report
  25. Fermi GRB190525.03 Global MASTER-Net observations report
  26. LIGO/Virgo S190521r: No optical counterpart from SVOM/GWAC-F30 observations.
  27. LIGO/Virgo S190521g: No optical counterpart from SVOM/GWAC observations.
  28. LIGO/Virgo S190519bj Global MASTER-Net observations report
  29. GRB 190519A: Swift-BAT refined analysis
  30. GRB 190519A: Fermi GBM Final Real-time Localization
  31. Fermi GRB190517.81 Global MASTER-Net observations report
  32. LIGO/Virgo S190517h Global MASTER-Net observations report
  33. LIGO/Virgo S190513bm: Swope follow-up observations
  34. LIGO/Virgo S190513bm: Lick/KAIT Follow-Up Observations
  35. Konus-Wind observation of GRB 190511A
  36. LIGO/Virgo S190510g: Further KMTNet observation of DECam-GROWTH and DESGW candidates
  37. LIGO/Virgo S190512at Global MASTER-Net observations report
  38. Fermi GRB190512.61 Global MASTER-Net observations report
  39. LIGO/Virgo S190510g: DOAO Observation
  40. LIGO/Virgo S190510g: KMTNet observation of DECam-GROWTH and DESGW candidates
  41. LIGO/Virgo S190510g: Las Cumbres Observatory Galaxy Targeted Counterpart Search
  42. LIGO/Virgo S190510g: GRAWITA REM and Loiano optical observations
  43. LIGO/Virgo S190510g: GRAWITA VST-ESO PARANAL optical observations
  44. LIGO/Virgo S190510g: Xinglong/Schmidt Follow-Up Observations
  45. LIGO/Virgo S190510g: Lick/KAIT Follow-Up Observations
  46. LIGO/Virgo S190510g: Lulin Optical Follow-up Observations
  47. LIGO/Virgo S190510g: GRAWITA REM optical observations
  48. Fermi GRB190507.97 Global MASTER-Net observations report
  49. Fermi GRB190507.27 Global MASTER-Net observations report
  50. IceCube-190504A: MASTER optical monitoring analysis
  51. Fermi GRB190506.58 Global MASTER-Net observations report
  52. Fermi GRB190505.05 Global MASTER-Net observations report
  53. Fermi GRB190504.68 Global MASTER-Net observations report
  54. LIGO/Virgo S190503bf Global MASTER-Net observations report
  55. IceCube-190503A: Lick/KAIT Follow-Up Observations
  56. IPN Triangulation of GRB 190501A (long/bright)
  57. LIGO/Virgo S190426c: YAHPT Optical Observation
  58. LIGO/Virgo S190426c: MASTER analysys of GRAWITA transients
  59. LIGO/Virgo S190426c: GRAWITA transients from Asiago Schmidt wide field observations
  60. LIGO/Virgo S190426c: OAJ-GRANDMA observation report
  61. LIGO/Virgo S190425z: MASTER explanation of the nature of an optical flash detected by a Swift as a short flare on a fast-moving WISE brown
  62. LIGO/Virgo S190425z: SVOM/GWAC-F60A observations
  63. LIGO/Virgo S190426c: COATLI Optical Observations of Galaxies
  64. LIGO/Virgo S190426c: Lick/KAIT Follow-Up Observations
  65. LIGO/Virgo S190426c: CNEOST Optical Observations
  66. LIGO/Virgo S190425z: CNEOST Optical Observations
  67. LIGO/Virgo S190425z: BOOTES-5/JGT observations of galaxies
  68. LIGO/Virgo S190425z: Lijiang 2.4-m Telescope Follow-up Observations
  69. LIGO/Virgo S190425z: Additional Pan-STARRS transients in the skymap
  70. LIGO/Virgo S190425z: GRANDMA follow-up observations with Les Makes-T60, AZT-8 and Abastumani-T70
  71. LIGO/Virgo S190425z: Further MMT Follow-Up Observations
  72. Baksan Neutrino Observatory Alert 190405.62: Global MASTER-Net:LIGO/Virgo S190425z: PanSTARR OT AT2019ebq/PS19qp
  73. LIGO/Virgo S190425z: COATLI Observations of Galaxies
  74. LIGO/Virgo S190425z: TAROT-GRANDMA observation report
  75. LIGO/Virgo S190425z: Las Cumbres Observatory Galaxy Targeted Counterpart Search
  76. LIGO/Virgo S190425z: KMTNet Observation
  77. LIGO/Virgo S190425z: Las Cumbres Observatory Galaxy Targeted Counterpart Search
  78. LIGO/Virgo S190425z: STARE2 simultaneous L-band radio observations
  79. LIGO/Virgo S190425z: OVRO-LWA simultaneous low frequency radio observations of localization region
  80. LIGO/Virgo S190425z: Lulin Follow-Up Observations
  81. LIGO/Virgo S190425z: J-GEM optical follow-up observations with Subaru/FOCAS
  82. LIGO/Virgo S190425z: Xinglong/Schmidt follow-up observations
  83. LIGO/Virgo S190425z: SQUEAN Observation
  84. LIGO/Virgo S190425z: MMT Follow-Up Observations
  85. LIGO/Virgo S190425z: Lick/KAIT Follow-Up Observations
  86. LIGO/Virgo S190421ar: Lick/KAIT Follow-Up Observations
  87. Swift GRB190422.96 Global MASTER-Net observations report
  88. Fermi GRB190422.67 Global MASTER-Net observations report
  89. LIGO/Virgo S190421ar Global MASTER-Net observations report
  90. Konus-Wind observation of GRB 190415A
  91. Fermi GRB190420.98 Global MASTER-Net observations report
  92. Fermi GRB190419.41 Global MASTER-Net observations report
  93. Fermi GRB190417.46 Global MASTER-Net observations report
  94. LIGO/Virgo S190412m: TAROT-GRANDMA observation report.
  95. Fermi GRB190415.17 Global MASTER-Net observations report
  96. LIGO/Virgo S190408an: GRAWITA optical observations of MASTER OT J231043.63+470956.4
  97. GRB 190404C: MITSuME Akeno and Okayama optical upper limits
  98. GRB 140404C: MAXI/GSC detection
  99. GRB 190330A: MITSuME Akeno and Okayama optical upper limits
  100. Trigger 896552: Swift detection of PSR B1055-52

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