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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"

37600 results found.

  1. GRB151127A: Planned XMM-Newton observation
  2. GRB 151127A: GROND K-band upper limit
  3. GRB 151127A: LCOGT-SSO optical upper limits
  4. GRB 151127A: Swift detection of a short burst
  5. GRB 151118A iTelescope observation
  6. GRB 151122A: Swift/UVOT Observations
  7. GRB 151122A: Swift-XRT observations
  8. GRB 151122A: Fermi GBM detection
  9. GRB 151122A: Swift ToO observations
  10. GRB 151122A: Swift detection of a burst
  11. Konus-Wind observation of GRB 151120A
  12. GRB 151027A: Maidanak optical observations
  13. Swift Trigger 664610 is not astrophysical
  14. Swift-BAT probable detection of an outburst from SGR J1819-1600 (AX J1818.8-1559)
  15. Swift Trigger 664610: is unlikely a GRB
  16. GRB 151118A: MITSuME Akeno optical upper limits
  17. GRB 151120A: Swift-XRT afterglow detection
  18. GRB 151120A: Fermi GBM observation
  19. GRB 151118A: AAO optical upper limit
  20. GRB 151120A: Swift ToO observations
  21. GRB 151120A: GROND optical/NIR afterglow
  22. GRB 151120A: A long GRB detected by INTEGRAL
  23. GRB 151118A, Swift-BAT refined analysis
  24. LIGO/Virgo G194575: Fermi GBM Observations
  25. 610 MHz detection of GRB 151027A with the GMRT
  26. GRB 151118A: Early optical limit from pt5m, La Palma
  27. GRB 151118A: ISON-NM early optical limit
  28. GRB 151118A: Swift-XRT refined Analysis
  29. GRB 151027A: SAO RAS and Mt. Terskol observations
  30. GRB 151118A: Swift/UVOT Upper Limits
  31. GRB 151118A: Enhanced Swift-XRT position
  32. GRB GRB 151118A: MASTER-NET optical observations
  33. GRB 151118A: Optical observations from OSN
  34. GRB 151118A: Swift detection of a burst
  35. GRB151027A; Optical observations
  36. GMRT radio detection of GRB 151027A
  37. GRB 151114A: GROND Detection of the Optical/NIR Afterglow Candidate
  38. GRB 151114A: Swift-XRT refined Analysis
  39. GRB 151107B: CALET Gamma-Ray Burst Monitor detection
  40. GRB 151114A: Swift-BAT refined analysis
  41. GRB 151112A: GROND photometric redshift and i'-band prediction
  42. GRB 151114A: Swift/UVOT Detection
  43. GRB 151114A: LCOGT-FTS afterglow observations
  44. GRB 151114A: Enhanced Swift-XRT position
  45. GRB 151114A: Swift detection of a burst with an optical counterpart
  46. GRB 151111A: GROND confirmation of the afterglow and photometric redshift estimate
  47. GRB 151112A: Swift/UVOT Upper Limits
  48. GRB 151112A: MAXI/GSC detection
  49. GRB 151112A: GROND Detection of the Optical/NIR Afterglow Candidate
  50. GRB 151112A: Swift-XRT refined Analysis
  51. GRB 151112A: Swift-BAT refined analysis
  52. GRB 151112A: Enhanced Swift-XRT position
  53. GRB 151112A: MASTER-NET optical limit
  54. GRB 151112A: initial UVOT observations
  55. GRB 151112A: Swift-XRT observations
  56. GRB 151112A: Swift detection of a burst
  57. GRB 151111A: Swift/UVOT upper limits
  58. Swift-BAT trigger 663164 is not a burst.
  59. GRB 151111A: GROND marginal detection of a afterglow candidate
  60. LIGO/Virgo G194575: VLA follow-up
  61. GRB 151111A: Swift-XRT refined Analysis
  62. GRB 151111A: Fermi GBM observation
  63. GRB 151111A: LCOGT-FTS afterglow observations
  64. GRB 151111A: Swift-BAT refined analysis
  65. GRB 151111A: Enhanced Swift-XRT position
  66. GRB 151111A: Swift detection of a burst
  67. IPN triangulation of GRB151107B
  68. GRB 151107B: MASTER-NET OT detection inside the FERMI error box
  69. GRB 151027A: continued Mondy optical observations
  70. GRB 151107B: Mini-MegaTORTORA limits on simultaneous optical emission
  71. GRB 151107A: Further investigation of the source nature
  72. GRB 151107B
  73. GRB 151107A, Swift-BAT refined analysis
  74. GRB 151027A: Hankasalmi optical observations
  75. GRB 151107A: MASTER-NET optical observations
  76. GRB 151107A: Swift detection of a possible burst
  77. LIGO/Virgo G194575: INAF-Asiago Telescope further analysis of iPTF candidates
  78. GRB 151027A: Mondy optical observations
  79. GRB 151027A: Mt. Terskol observatory optical observation
  80. GRB 150910A: CrAO optical observations
  81. GRB 151027A: the missing GeV component
  82. GRB 151029A: FRAM optical afterglow detection
  83. GRB 151027A: Correction to GCN 18519
  84. GRB 151031A: MITSuME Akeno optical upper limits
  85. GRB 151031A: GROND observation
  86. GRB 151027B: ATCA radio detection
  87. GRB 151031A
  88. GRB 151031A: Swift/UVOT Detection
  89. GRB 151030A: Fermi GBM observation
  90. GRB 151031A: Swift-XRT refined Analysis
  91. GRB 151027B: RATIR Late-Time Upper Limits
  92. GRB 151031A: Swift-BAT refined analysis
  93. GRB 151031A: Enhanced Swift-XRT position
  94. GRB 151031A: VLT/X-shooter optical counterpart and redshift
  95. GRB 151027A: optical follow-up observations
  96. GRB 151031A: Swift detection of a burst
  97. GRB 151027A: Continued P60 Monitoring
  98. Correction to the Trigger Time for Swift GRB 151029A
  99. GRB 151029A: MITSuME Ishigakijima upper limits
  100. GRB 151027A: Optical counterpart detection

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