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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"

41752 results found.

  1. IPN Triangulation of GRB 151227B
  2. GRB 151228A: Correction to GCN 18770
  3. LIGO/Virgo G211117: SkyMapper observations and transient candidate
  4. GRB 151228A: Swift-XRT refined Analysis
  5. V404Cyg Swift Trigger 668097: CrAO RT-22 radio observations
  6. LIGO/Virgo G211117: MASTER Observations of the 3 iPTF candidates
  7. V404Cyg Swift Trigger 668097: AbAO optical observations
  8. GRB 151228B: Swift/UVOT Detection
  9. GRB 151229A: MITSuME Akeno optical upper limits
  10. LIGO/Virgo G211117: Optical Observations with Kiso Schmidt telescope and KWFC
  11. LIGO/Virgo G211117: List of near-term future observation regions by Project Mini-GWAC of SVOM
  12. LIGO/Virgo G211117: iPTF Optical Transient Candidates
  13. GRB 151229A: MITSuME Okayama upper limits
  14. GRB 151229A Swift-BAT Spectral lag analysis
  15. LIGO/Virgo G211117: La Silla - QUEST observations 2015 Dec 28, 29
  16. GRB 151228B: MITSuME Akeno optical upper limits
  17. GRB 151229A: Swift-XRT refined Analysis
  18. GRB 151229A: Fermi GBM observation
  19. GRB 151228B: Fermi GBM observation
  20. GRB 151228A: Swift-BAT refined analysis
  21. GRB 151229A: Swift/UVOT observations
  22. GRB 151228B: Swift-BAT refined analysis
  23. GRB 151229A: Swift-BAT refined analysis
  24. GRB 151228B: Swift-XRT refined Analysis
  25. LIGO/Virgo G211117: Further Swift-XRT sources
  26. GRB 151228A: MITSuME Akeno optical upper limits
  27. GRB 151228A: T60 observations
  28. GRB 151229A: Swift detection of a short burst
  29. LIGO/Virgo G211117: DESGW program observations with DECam
  30. LIGO/Virgo G211117: Optical NIR observation with Kanata telescope
  31. LIGO/Virgo G211117: Fermi GBM Observations
  32. LIGO/Virgo G211117: Optical follow-up with Kanata telescope
  33. GRB 151228B: Swift detection of a burst with an optical detection
  34. LIGO/Virgo G211117: MASTER Observations and Inspection + OT
  35. GRB 151228A: Fermi GBM observation
  36. LIGO/Virgo G211117: Pan-STARRS1 observations 2015-12-28
  37. LIGO/Virgo G211117: INAF VST-ESO PARANAL observations
  38. LIGO/Virgo G211117: Further Swift-XRT sources
  39. LIGO/Virgo G211117: Swift-XRT sources
  40. GRB 151228A: Swift detection of a short burst
  41. LIGO/Virgo G211117: SWASP optical observations
  42. LIGO/Virgo G211117: MASTER possible OT detection at the begining of inspection
  43. LIGO/Virgo G211117: Identification of a GW CBC Candidate
  44. GRB 151227B: Fermi GBM detection
  45. GRB 151227A: Fermi GBM detection
  46. GRB 151212A iTelescope observation
  47. Konus-Wind observation of GRB 151222A
  48. Fermi GBM trigger 472694170/151224997 is not a GRB
  49. V404Cyg Swift Trigger 668097: TSHAO optical observations
  50. IPN Triangulation of GRB 151222A (short/hard)
  51. Fermi GBM trigger 151221730 is not a GRB
  52. V404Cyg Swift Trigger 668097: MASTER-Tunka optical wake up detection
  53. V404Cyg Swift Trigger 668097:
  54. GRB 151222A: Fermi GBM detection
  55. Fermi GBM trigger 151221690 is not a GRB
  56. Fermi GBM trigger 472271765/151220108 is not a GRB
  57. IBAS Alert 7313 is SGR J1935+2154
  58. GRB 151221A: INTEGRAL detection of a short burst or possible SGR
  59. Fermi GBM trigger 472166503/151218890 is not a GRB
  60. LIGO/Virgo G184098: Fermi-LAT search for high-energy gamma-ray counterpart
  61. GRB 151215A: TSHAO optical observations
  62. GRB151215A: Continued P60 Observations
  63. GRB 151212B: CALET Gamma-Ray Burst Monitor detection
  64. GRB 151216A: MAXI/GSC detection
  65. GRB 151210B: Fermi GBM observation
  66. GRB151215A: Early optical light curve from pt5m, La Palma
  67. GRB 151215A: MITSuME Akeno optical upper limits
  68. GRB 151210B: CALET Gamma-Ray Burst Monitor detection
  69. GRB 151215A: Swift-XRT refined Analysis
  70. GRB 151215A: Swift-BAT refined analysis
  71. GRB151215A: Swift/UVOT detection
  72. GRB 151215A: MASTER early OT detection and light curve
  73. GRB 151215A: NOT spectroscopy and redshift
  74. GRB 151215A: GROND Detection of the Optical/NIR Afterglow
  75. GRB151215A: P60 Optical Afterglow Candidate
  76. GRB 151215A: Swift detection of a burst
  77. LIGO/Virgo G184098: LOFAR follow-up
  78. GRB151212A: Swift/UVOT observations
  79. GRB 151212A: GROND Optical Afterglow Candidate
  80. GRB 151212A: Swift-XRT afterglow detection
  81. GRB 151212A: Tiled Swift observations
  82. GRB 151212A: MAXI/GSC detection
  83. GRB 151210A: Swift/UVOT Upper Limits
  84. GRB 151210A: Swift-BAT refined analysis
  85. GRB 151210A: Swift-XRT refined Analysis
  86. GRB 151210A: GROND Afterglow Confirmation
  87. GRB 151210A: Optical afterglow candidate from LCOGT-Cerro Tololo
  88. GRB 151210A: Swift detection of a burst
  89. GRB 151205C: Optical follow-up observations at Kiso
  90. GRB 151205A: Khureltogot upper limit
  91. Swift detection of 4U 1850-03
  92. GRB 151205B: Deep GROND Upper limits
  93. GRB 130831A: MASTER early OT detection and LC
  94. GRB 151205B: further Swift-XRT observations
  95. GRB 151205C: Swift-XRT observations
  96. GRB 151205B, Swift-BAT refined analysis
  97. GRB 151205A: Swift-XRT refined Analysis
  98. GRB 151205A, Swift-BAT refined analysis
  99. GRB 151205C: Tiled Swift observations
  100. GRB 151205C: MAXI/GSC detection

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