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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"

5553 results found.

  1. GRB 151216A: MAXI/GSC detection
  2. GRB151215A: Early optical light curve from pt5m, La Palma
  3. GRB 151215A: MASTER early OT detection and light curve
  4. GRB 151215A: Swift detection of a burst
  5. GRB 151212A: GROND Optical Afterglow Candidate
  6. GRB 151212A: Swift-XRT afterglow detection
  7. GRB 151212A: MAXI/GSC detection
  8. GRB 151210A: GROND Afterglow Confirmation
  9. GRB 151210A: Optical afterglow candidate from LCOGT-Cerro Tololo
  10. GRB 151210A: Swift detection of a burst
  11. GRB 151205C: Optical follow-up observations at Kiso
  12. Swift detection of 4U 1850-03
  13. GRB 130831A: MASTER early OT detection and LC
  14. Fermi GBM trigger 470375959/151128166 is not a GRB
  15. GRB 151118A iTelescope observation
  16. GRB 151118A: Early optical limit from pt5m, La Palma
  17. GRB 151118A: ISON-NM early optical limit
  18. GRB GRB 151118A: MASTER-NET optical observations
  19. GRB 151118A: Optical observations from OSN
  20. GRB 151118A: Swift detection of a burst
  21. GRB 151114A: Swift/UVOT Detection
  22. GRB 151114A: Swift detection of a burst with an optical counterpart
  23. GRB 151112A: MAXI/GSC detection
  24. GRB 151111A: GROND marginal detection of a afterglow candidate
  25. GRB 151111A: LCOGT-FTS afterglow observations
  26. LIGO/Virgo G194575: La Silla QUEST, Pan-STARRS and PESSTO observations of iPTF15dld
  27. LIGO/Virgo G194575: VLA follow-up
  28. LIGO/Virgo G194575: INAF-TNG follow-up of iPTF15dkm and iPTF15dlj
  29. GRB 151027A: MAXI/GSC detection
  30. Konus-Wind observation of GRB 151027A
  31. GRB 151027B: VLT/X-shooter redshift
  32. LIGO/Virgo G194575: iPTF Optical Transient Candidates
  33. GRB 151027A: Early RAPTOR Observations
  34. LIGO/Virgo G194575: MASTER Optical Inspection
  35. GRB 151027A: Fermi GBM observation
  36. GRB 151027A : ISON-NM early optical detection
  37. GRB 151027A: Swift detection of a burst with a bright optical afterglow
  38. GRB 151021A: Skynet PROMPT-CTIO/DSO17 observations of the optical afterglow
  39. LIGO/Virgo G194575: Kanata/J-GEM optical follow-up
  40. GRB 151023A
  41. LIGO/Virgo G194575: LOFAR follow-up
  42. LIGO/Virgo G184098: Further VST-ESO PARANAL observations
  43. LIGO/VIRGO G184098 : PESSTO classification of PS15cbm in the northern region
  44. LIGO/Virgo G184098: ongoing Pan-STARRS search for optical transients
  45. LIGO/Virgo G184098: ongoing Pan-STARRS search for optical transients
  46. IPN Triangulation of GRB 150919A (short / hard)
  47. LIGO/Virgo G184098: Pan-STARRS1 observations of the northern sky region
  48. LIGO/Virgo G184098: Observations from the TOROS collaboration
  49. LIGO/Virgo G184098: iPTF Optical Transient Candidates
  50. LIGO/Virgo G184098: Swift follow-up observations
  51. GRB 150910A: TSHAO optical observations
  52. GRB 150915A: MASTER-NET optical observations
  53. GRB 150911A: Khureltogot upper limit
  54. GRB 150911A: WHT optical imaging
  55. GRB150911A: P60 Observations
  56. GRB150911A MITSuME Okayama Ks-band upper-limit
  57. GRB 150910A: MITSuME Okayama Ks-band Observation
  58. GRB 150910A: SAO RAS optical photometry
  59. GRB 150907B: GROND Upper Limits
  60. ANTARES neutrino Alert150901.32 alert and Swift XRT counterpart: MASTER optical observations and new possible candidate
  61. IPN Triangulation of GRB 150824A
  62. Swift Trigger 652824: Is most likely a noise fluctuation in the direction of M31
  63. GRB 150818A: Continued NOT monitoring - afterglow confirmation
  64. IPN Triangulation of GRB 150819B (short / very intense)
  65. GRB 150817A: LCOGT observations
  66. GRB 150817A: Swift-BAT refined analysis
  67. GRB 150817A: Enhanced Swift-XRT position
  68. GRB 150817A: Continued RATIR Observations, Revised Candidate
  69. GRB 150817A: Swift detection of a burst
  70. GRB 150801A: MAXI/GSC detection
  71. GRB 150724B: Swift-XRT afterglow detection
  72. GRB 150727A: Swift detection of a burst with an optical counterpart
  73. GRB 150724B: Swift-XRT observations
  74. GRB 150725A: MAXI/GSC detection
  75. Swift IGR J00291+5934: MASTER Optical flare detection
  76. GRB 150711A: Swift detection of a burst
  77. Swift-XRT observations of GRB 150710A
  78. GRB 150702A: MASTER-SAAO inspection
  79. GRB 150702A: Swift-XRT observations
  80. GRB 150608A: Swift-XRT follow-up observations
  81. GRB 150608A: MITSuME Akeno optical upper limits
  82. GRB150607A: Discovery Channel Telescope Optical Observations
  83. GRB 150518A: possible SN observations
  84. Swift Trigger 642453: a possible GRB
  85. GRB 150512A: iPTF Optical Observations
  86. Konus-Wind observation of GRB 150510A
  87. GRB 150510A: Fermi GBM detection
  88. GRB 150510A: Fermi-LAT detection
  89. Confirmation that Swift Trigger 639636 is not astrophysical
  90. GRB 150430A: MAXI/GSC detection
  91. GRB 150428B: IRSF NIR upper limits
  92. GRB 150428B: MASTER-net prompt optical observation
  93. GRB 150428C/MAXI J0400+678: MAXI/GSC detection
  94. GRB 150428A: P60 observations
  95. GRB 150428B: Swift detection of a burst
  96. GRB 150423A: MITSuME Akeno Optical observation
  97. GRB 150413A: P60 photometry
  98. GRB 150403A: MASTER-net optical observation
  99. GRB 150403A: Fermi GBM Detection
  100. GRB 150323C: CrAO optical observations

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