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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"

27594 results found.

  1. GRB 151027B: Swift detection of its 1000-th burst
  2. LIGO/Virgo G194575: iPTF Optical Transient Candidates
  3. GRB 151027A: Swift-BAT refined analysis
  4. GRB 151027A: Early RAPTOR Observations
  5. LIGO/Virgo G194575: MASTER Optical Inspection
  6. GRB 151027A: GMG observation
  7. GRB 151027A: Fermi GBM observation
  8. GRB 151027A: Swift-XRT refined Analysis
  9. LIGO/Virgo G194575: Swift observations of LSQ15bjb
  10. LIGO/Virgo G194575: INAF-TNG spectra of LSQ15bjb
  11. LIGO/Virgo G194575: further Pan-STARRS observations of the RA=1hr localisation region
  12. Tentative redshift for GRB 151027A from Swift-XRT data
  13. GRB 151027A: P60 afterglow confirmation and rebrightening
  14. GRB 151027A : ISON-NM early optical detection
  15. GRB 151027A: KAIT optical afterglow confirmation
  16. GRB 151027A: Swift detection of a burst with a bright optical afterglow
  17. LIGO/Virgo G194575: INAF-TNG follow-up of LSQ15bjb
  18. GRB 151021A: Skynet PROMPT-CTIO/DSO17 observations of the optical afterglow
  19. GRB 151023A: Swift-BAT refined analysis
  20. LIGO/Virgo G194575: MAXI/GSC observations
  21. LIGO/Virgo G194575: Swift observations
  22. GRB 151023A: RATIR Observations
  23. GRB 151023A: Swift-XRT refined Analysis
  24. GRB 151023A: Swift/UVOT Upper Limits
  25. GRB 151023A
  26. Possible Fermi-LAT Gamma-ray counterpart for LIGO/Virgo G194575
  27. LIGO/Virgo G194575: LOFAR follow-up
  28. GRB 151022A: Swift/UVOT Upper Limits
  29. LIGO/Virgo G194575: RATIR Observations of Nearby Galaxies in the 1sigma Error Region
  30. LIGO Virgo G194575: MWA Observations
  31. LIGO/Virgo G194575: INTEGRAL search of temporally coincident prompt hard X-ray emission
  32. LIGO/Virgo G194575: RATIR Observations of Nearby Galaxies in the 1sigma Error Region
  33. GRB 151022A: Swift-BAT refined analysis
  34. GRB 151023A: Swift detection of a burst
  35. GRB 151022A: RATIR Upper Limits
  36. GRB 151022A: Swift-XRT refined Analysis
  37. LIGO/Virgo G194575: transients from Pan-STARRS in the RA=1hr localisation region
  38. LIGO/Virgo G194575: Identification of a GW CBC Candidate
  39. GRB 151022A: MITSuME Okayama Ks-band upper-limit
  40. GRB 151022A: Kanata/HOWPol optical observation
  41. GRB 151022A: MASTER-Ural observations
  42. GRB 151022A: Swift detection of a burst
  43. GRB 151021A: MITSuME Okayama Ks-band upper-limit
  44. GRB 151021B: Fermi GBM detection
  45. Konus-Wind observation of GRB 151021A
  46. GRB 151021A: Swift/UVOT Detection
  47. GRB 151021A: Swift-XRT refined Analysis
  48. GRB 151021A: Swift-BAT refined analysis
  49. GRB 151021A: MASTER-NET bright OT detection
  50. GRB 151021A: Swift detection of a burst
  51. LIGO/Virgo G184098: LOFAR follow-up
  52. GRB 151004A: Swift-XRT follow-up observations
  53. Trigger 659734: Swift detection of SAX J1750.8-2900 or other source near Galactic center
  54. Fermi GBM trigger 466602792/151015495 is not a GRB
  55. Fermi GBM trigger 466316973/151012187 is not a GRB
  56. Fermi GBM trigger 466059859/151009211 is not a GRB
  57. Konus-Wind observation of GRB 151006A
  58. Swift Trigger 658045 is not a GRB
  59. GRB 151006A: Swift-BAT refined analysis
  60. GRB 151006A: MITSuME Okayama Ks-band upper-limit
  61. GRB 151006A: Swift-XRT refined Analysis
  62. GRB 151006A: Fermi-LAT detection
  63. GRB 151006A: Swift/UVOT Upper Limits
  64. GRB 151006A: Fermi GBM detection
  65. Konus-Wind observation of GRB 151001B
  66. GRB 151006A: Kanata/HOWPol optical imaging polarimetry
  67. GRB 151006A: Swift detection of a burst
  68. LIGO/Virgo G184098: Further VST-ESO PARANAL observations
  69. Trigger 657564 / GRB 151004A: Swift BAT and XRT refined analysis
  70. Trigger 657564 / GRB 151004A: Swift/UVOT Upper Limits
  71. Swift Trigger 657564: MASTER-NET early optical observations.
  72. Swift Trigger 657564: XRT prompt analysis
  73. LIGO/Virgo G184098: MASTER OTs detection and Scenario Machine prediction
  74. Swift Trigger 657564: a probable GRB
  75. GRB 151001A: Swift-BAT refined analysis
  76. GRB 151001A: RATIR Observations
  77. GRB 151001B: Swift/UVOT Upper Limits
  78. GRB 151001B: Swift-XRT refined Analysis
  79. GRB 151001B: Swift-BAT refined analysis
  80. GRB 151001A: Swift/UVOT Detection
  81. GRB 151001B: MASTER-NET early optical observations.
  82. GRB 151001A: NOT imaging
  83. GRB 151001A: Swift-XRT refined Analysis
  84. GRB 151001A: Fermi GBM detection
  85. GRB 151001B: Swift detection of a burst
  86. GRB 151001A: Swift detection of a burst with an optical counterpart
  87. LIGO/Virgo G184098: Liverpool Telescope Spectroscopy of PS15ccx
  88. GRB 150925A: Swift/UVOT Upper Limits
  89. GRB 150925A: Swift-BAT refined analysis
  90. GRB 150925A: Swift-XRT refined Analysis
  91. GRB 150925A: Swift detection of a burst
  92. LIGO/Virgo G184098: LOFAR follow-up
  93. LIGO/VIRGO G184098 : classifications of transients from the LSQ observations
  94. GRB 150922A: Fermi GBM observation
  95. IPN Triangulation of GRB 150922A (short/hard)
  96. LIGO/Virgo G184098: INTEGRAL search of temporally coincident prompt hard X-ray emission
  97. Fermi GBM trigger bn150920977 is not due to a GRB
  98. LIGO/Virgo G184098: DESGW followup program
  99. LIGO/Virgo G184098: SkyMapper observations
  100. LIGO/Virgo G184098: TAROT network optical observations

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