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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"

27576 results found.

  1. GRB 160131A: Bassano Bresciano Observatory optical observations
  2. GRB 160131A: Swift-XRT refined Analysis
  3. GRB 160131A: Swift-BAT refined analysis
  4. GRB 160131A: LCOGT-SSO optical observations
  5. GRB 160131A: RATIR Optical Observations
  6. GRB 160131A: LCOGT-FTN optical afterglow observations
  7. GRB160131.35 MASTER-Net OT detection
  8. GRB 160131A: Swift detection of a burst with an optical counterpart
  9. GRB 160127A: RATIR Optical Observations
  10. GRB 160127A: Swift/UVOT Detection
  11. GRB 160127A: Swift-BAT refined analysis
  12. GRB 160127A: Swift-XRT refined Analysis
  13. GRB 160123A: TAROT La Silla observatory optical observations
  14. GRB 160127A: RATIR Optical Observations
  15. GRB 160127A: TAROT La Silla observatory optical light curve
  16. GRB 160127A: Swift detection of a burst with an optical counterpart
  17. LIGO Virgo G211117: MWA Observations
  18. GRB 160123A: GROND Upper limits
  19. GRB 160121A: RATIR Optical Observations
  20. GRB 160118A CALET Gamma-Ray Burst Monitor detection
  21. GRB 160123A: Swift/UVOT Upper Limits
  22. GRB 160123A: Swift-XRT refined Analysis
  23. GRB 160123A: Swift-BAT refined analysis
  24. GRB 160123A: Swift detection of a burst
  25. GRB 160121A: RATIR Optical Observations
  26. GRB 160121A: Swift-XRT refined Analysis
  27. GRB 160121A: Swift/UVOT Upper Limits
  28. GRB 160121A: GROND Afterglow observations
  29. GRB 160121A: Swift-BAT refined analysis
  30. GRB 160121A: 1.8m MOA optical afterglow detection
  31. GRB 160117B: RATIR continued observations
  32. GRB 160117B: TNG spectroscopy and redshift confirmation
  33. GRB 160121A: MASTER-Amur observations
  34. GRB 160121A: Swift detection of a burst
  35. Konus-Wind observation of GRB 160119A
  36. GRB 160117A: Swift-XRT afterglow detection
  37. GRB 160117B: further RATIR observations
  38. GRB160119A: BOOTES-2/TELMA Early Upper Limits
  39. GRB 160119A: Swift/UVOT Upper Limits
  40. GRB 160119A: GROND optical/NIR afterglow observations
  41. GRB 160119A: RATIR Optical and NIR Observations
  42. GRB 160117B: RATIR Optical and NIR Observations
  43. GRB 160119A: Swift-BAT refined analysis
  44. GRB 160119A: Swift-XRT refined Analysis
  45. GRB 160119A: NOT and GTC afterglow candidate
  46. GRB 160117B: Early iTelescope observation
  47. GRB 160119A: Swift detection of a burst
  48. GRB 160117A: Swift/UVOT Upper Limits
  49. GRB 160117A: Swift-XRT observations
  50. GRB 160117B: GROND optical/NIR afterglow observations
  51. GRB 160117B: Swift-XRT refined Analysis
  52. GRB 160117A: Swift-BAT refined analysis
  53. GRB 160117B: Swift/UVOT Detection
  54. GRB 160117B: LCOGT-SSO optical observations
  55. GRB 160117B: MASTER-Amur OT observations
  56. GRB 160117B: Swift detection of a burst with optical counterpart
  57. GRB 160117A: Swift detection of a burst
  58. GRB 160106A: CALET Gamma-Ray Burst Monitor detection
  59. IPN Triangulation of GRB 160113A
  60. LIGO/Virgo G211117: Further Swift-XRT sources
  61. Konus-Wind observation of GRB 160104B
  62. IPN Triangulation of GRB 160111A (short/hard)
  63. GRB 151225A: Correction to the trigger time of GCN 18724
  64. GRB 160113A: Fermi GBM detection
  65. GRB 160113A: iPTF P48 Observations and Optical Transient Candidates
  66. GRB 160104A: Swift/UVOT Detection
  67. IPN Triangulation of GRB 151231A
  68. LIGO/Virgo G211117: Updated FAR estimate based on offline re-analysis
  69. IPN Triangulation of GRB 151229B (extremely intense/long)
  70. LIGO/Virgo G184098: Updated FAR estimate
  71. LIGO/Virgo G211117: Swift observations of PS15dpn
  72. LIGO/Virgo G211117: iPTF Observations of PS15dpn
  73. GRB 160107A: Fermi GBM observation
  74. IPN Triangulation of GRB 151225A (short/hard)
  75. LIGO/Virgo G211117: Further Swift-XRT sources
  76. GRB 160104A: Swift-XRT refined Analysis
  77. GRB 160104A: Swift-BAT refined analysis
  78. GRB 160104A: Fermi GBM observation
  79. GRB 160104A: Mini-GWAC upper limit during prompt emission phase
  80. GRB 160104A: GWAC upper limit during prompt emission phase
  81. GRB 160104A: MASTER early OT detection
  82. GRB 160104A: MITSuME Okayama Ks-band upper-limit
  83. GRB 160104A: LCOGT-FTN afterglow candidate
  84. GRB 160104A: Swift detection of a burst
  85. LIGO/Virgo G211117: Fermi/LAT observations
  86. LIGO/Virgo G211117: Gemini classification of 7 Pan-STARRS transients
  87. LIGO/Virgo G211117: LOFAR follow-up
  88. LIGO/Virgo G211117: MASTER OTs 26.XII.2015 - 01.I.2016
  89. GRB 160101B: Fermi-LAT detection
  90. GRB 160101B: Fermi GBM detection
  91. GRB 160101A: Fermi GBM observation
  92. LIGO/Virgo G211117: FLOYDS Classification of SMTJ13331687-1607330 as a Two-Week-Old Type Ia Supernova
  93. GRB 151231B: Fermi GBM observation
  94. GRB 151231A: Fermi GBM observation
  95. LIGO/Virgo G211117: 44 transients from Pan-STARRS data during 2015-12-28/30
  96. Trigger 668949: Swift detection of V 404 Cyg
  97. LIGO/Virgo G211117: MAXI/GSC observations
  98. MASTER-NET observations of V404Cyg Swift Trigger 668877
  99. Trigger 668879: Swift detection of V 404 Cyg again
  100. Trigger 668877: Swift detection of V 404 Cyg

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