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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"

28262 results found.

  1. GRB 160127A: Swift detection of a burst with an optical counterpart
  2. GRB 160123A: GROND Upper limits
  3. GRB 160121A: RATIR Optical Observations
  4. GRB 160121A: TSHAO optical observation
  5. GRB 160123A: NOT J-band observations
  6. GRB 160123A: Swift/UVOT Upper Limits
  7. GRB 160123A: Swift-XRT refined Analysis
  8. GRB 160123A: Swift-BAT refined analysis
  9. GRB 160123A: LCOGT-SSO optical upper limit
  10. GRB 160123A: Enhanced Swift-XRT position
  11. GRB 160123A: Swift detection of a burst
  12. GRB 160121A: redshift from the 10.4m GTC
  13. GRB 160121A: RATIR Optical Observations
  14. GRB 160121A: Swift-XRT refined Analysis
  15. GRB 160121A: Swift/UVOT Upper Limits
  16. GRB 160121A: GROND Afterglow observations
  17. GRB 160121A: TSHAO optical afterglow confirmation
  18. GRB 160121A: Swift-BAT refined analysis
  19. GRB 160121A: Enhanced Swift-XRT position
  20. GRB 160121A: 1.8m MOA optical afterglow detection
  21. GRB 160117B: RATIR continued observations
  22. LIGO/VIRGO G184098: Summary of VLA results for iPTF15cyk
  23. GRB 160121A: Swift detection of a burst
  24. Konus-Wind observation of GRB 160119A
  25. GRB 160117A: Swift-XRT afterglow detection
  26. GRB 160117B: further RATIR observations
  27. GRB 160119A: afterglow confirmation from the NOT
  28. GRB160119A: BOOTES-2/TELMA Early Upper Limits
  29. GRB 160119A: Swift/UVOT Upper Limits
  30. LIGO/Virgo G184098: MASTER final result
  31. GRB 160119A: GROND optical/NIR afterglow observations
  32. GRB 160119A: RATIR Optical and NIR Observations
  33. GRB 160117B: RATIR Optical and NIR Observations
  34. GRB 160119A: Swift-BAT refined analysis
  35. GRB 160119A: Swift-XRT refined Analysis
  36. GRB 160119A: Enhanced Swift-XRT position
  37. GRB 160119A: NOT and GTC afterglow candidate
  38. GRB 160117B: Early iTelescope observation
  39. GRB 160119A: Swift detection of a burst
  40. GRB 160117A: Swift/UVOT Upper Limits
  41. GRB 151228B: AbAO optical upper limit
  42. GRB 160104A: ISON-Ussuriysk optical observations
  43. GRB 160117A: Swift-XRT observations
  44. GRB 160117B: GROND optical/NIR afterglow observations
  45. GRB 160117B: Swift-XRT refined Analysis
  46. GRB 160117A: Swift-BAT refined analysis
  47. GRB 160117B: Swift/UVOT Detection
  48. GRB 160117B: Enhanced Swift-XRT position
  49. GRB 160117B: LCOGT-SSO optical observations
  50. GRB 160117B: Swift detection of a burst with optical counterpart
  51. LIGO/Virgo G211117: Preliminary VLA observation summary of PS15dpn
  52. IPN Triangulation of GRB 160113A
  53. LIGO/Virgo G211117: Further Swift-XRT sources
  54. Konus-Wind observation of GRB 160104B
  55. Konus-Wind observation of GRB 160102A
  56. IPN Triangulation of GRB 160111A (short/hard)
  57. GRB 160113A: Swift-XRT observations
  58. GRB 160113A: Fermi GBM detection
  59. GRB 160113A: iPTF P48 Observations and Optical Transient Candidates
  60. GRB 160104A: Swift/UVOT Detection
  61. IPN Triangulation of GRB 151231A
  62. IPN Triangulation of GRB 151229B (extremely intense/long)
  63. LIGO/Virgo G211117: Swift observations of PS15dpn
  64. GRB 160107A: Fermi GBM observation
  65. LIGO/Virgo G211117: Pi of the Sky observations
  66. LIGO/Virgo G211117: VISTA imaging
  67. LIGO/Virgo G211117: Subaru Hyper Suprime-Cam follow-up observation
  68. GRB 160107A: MAXI/GSC detection
  69. IPN Triangulation of GRB 151225A (short/hard)
  70. LIGO/Virgo G211117: Further Swift-XRT sources
  71. GRB 160104A: Nishi-Harima MINT Observations
  72. GRB 160104A: Swift-XRT refined Analysis
  73. GRB 160104A: Swift-BAT refined analysis
  74. GRB 160104A: Fermi GBM observation
  75. GRB 160104A: Mini-GWAC upper limit during prompt emission phase
  76. GRB 160104A: GWAC upper limit during prompt emission phase
  77. GRB 160104A: MITSuME Okayama upper limits
  78. LIGO/Virgo G211117: Summary of Pan-STARRS transients
  79. LIGO/Virgo G211117: INAF TNG follow-up of Kanata telescope candidate
  80. GRB 160104A: Enhanced Swift-XRT position
  81. GRB 160104A: MITSuME Okayama Ks-band upper-limit
  82. GRB 160104B: MAXI/GSC detection
  83. GRB 160104A: LCOGT-FTN afterglow candidate
  84. GRB 160104A: Swift detection of a burst
  85. GRB 160101A: CALET Gamma-Ray Burst Monitor detection
  86. LIGO/Virgo G211117: Gemini classification of 7 Pan-STARRS transients
  87. LIGO/Virgo G211117: LOFAR follow-up
  88. GRB 160102A: Swift-XRT observations
  89. LIGO/Virgo G211117: PESSTO classification of Pan-STARRS transients
  90. GRB 160101A: MITSuME Akeno optical upper limits
  91. LIGO/Virgo G211117: MASTER OTs 26.XII.2015 - 01.I.2016
  92. LIGO/Virgo G211117: CSS/CRTS observations on 29/30 Dec 2015 UT
  93. GRB 160102A: MAXI/GSC detection
  94. GRB 160101B: Fermi-LAT detection
  95. GRB 160101B: Fermi GBM detection
  96. GRB 160101A: Swift/UVOT Detection
  97. GRB 160101A: Fermi GBM observation
  98. GRB 160101A: Swift-XRT afterglow detection
  99. GRB 160101A: MAXI/GSC detection
  100. GRB 151231B: Fermi GBM observation

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