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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"

27215 results found.

  1. GRB 151118A: Swift/UVOT Upper Limits
  2. GRB GRB 151118A: MASTER-NET optical observations
  3. GRB 151118A: Swift detection of a burst
  4. Swift-BAT resumption of normal operations
  5. GRB 151114A: GROND Detection of the Optical/NIR Afterglow Candidate
  6. GRB 151114A: Swift-XRT refined Analysis
  7. GRB 151107B: CALET Gamma-Ray Burst Monitor detection
  8. GRB 151114A: Swift-BAT refined analysis
  9. GRB 151112A: GROND photometric redshift and i'-band prediction
  10. GRB 151114A: Swift/UVOT Detection
  11. GRB 151114A: LCOGT-FTS afterglow observations
  12. GRB 151114A: Swift detection of a burst with an optical counterpart
  13. GRB 151111A: GROND confirmation of the afterglow and photometric redshift estimate
  14. GRB 151112A: Swift/UVOT Upper Limits
  15. GRB 151112A: GROND Detection of the Optical/NIR Afterglow Candidate
  16. GRB 151112A: Swift-XRT refined Analysis
  17. GRB 151112A: Swift-BAT refined analysis
  18. GRB 151112A: MASTER-NET optical limit
  19. GRB 151112A: initial UVOT observations
  20. GRB 151112A: Swift-XRT observations
  21. GRB 151112A: Swift detection of a burst
  22. GRB 151111A: Swift/UVOT upper limits
  23. Swift-BAT trigger 663164 is not a burst.
  24. GRB 151111A: GROND marginal detection of a afterglow candidate
  25. GRB 151111A: Swift-XRT refined Analysis
  26. GRB 151111A: Fermi GBM observation
  27. GRB 151111A: LCOGT-FTS afterglow observations
  28. GRB 151111A: Swift-BAT refined analysis
  29. GRB 151111A: Swift detection of a burst
  30. GRB 151107B: MASTER-NET OT detection inside the FERMI error box
  31. GRB 151107B: Mini-MegaTORTORA limits on simultaneous optical emission
  32. LIGO/Virgo G194575: La Silla QUEST, Pan-STARRS and PESSTO observations of iPTF15dld
  33. GRB 151107A: Further investigation of the source nature
  34. GRB 151107B
  35. LIGO/Virgo G194575: Swift observations if iPTF15dld
  36. GRB 151107A, Swift-BAT refined analysis
  37. LIGO/Virgo G194575: INAF-TNG/Asiago Telescope follow-up of iPTF15dld
  38. GRB 151107A: MASTER-NET optical observations
  39. GRB 151107A: Swift detection of a possible burst
  40. LIGO/Virgo G194575: INAF-Asiago Telescope follow-up of iPTF candidates
  41. LIGO/Virgo G194575: MAXI/GSC further analysis
  42. GRB 151029A: FRAM optical afterglow detection
  43. GRB 151031A: GROND observation
  44. GRB 151027B: ATCA radio detection
  45. GRB 151031A: Swift/UVOT Detection
  46. GRB 151030A: Fermi GBM observation
  47. GRB 151031A: Swift-XRT refined Analysis
  48. GRB 151027B: RATIR Late-Time Upper Limits
  49. GRB 151031A: Swift-BAT refined analysis
  50. GRB 151031A: Swift detection of a burst
  51. LIGO/Virgo G194575: INAF-TNG follow-up of iPTF15dkm and iPTF15dlj
  52. Correction to the Trigger Time for Swift GRB 151029A
  53. GRB 151029A: Swift-XRT refined Analysis
  54. GRB 151029A: Swift/UVOT Detection
  55. GRB 151029A: LCOGT-FTS afterglow observations
  56. GRB 151029A: Swift-BAT refined analysis
  57. GRB 151027A: MAXI/GSC detection
  58. GRB 151029A: GROND afterglow observations
  59. GRB 151029A: Swift detection of a burst with an optical counterpart
  60. GRB 151027A: SAO RAS optical observations
  61. GRB 151027B: LCOGT FTN afterglow observations
  62. GRB 151027A: T100 observations
  63. GRB 151027B: Swift/UVOT Upper Limits
  64. Konus-Wind observation of GRB 151027A
  65. GRB 151027B: Swift-BAT refined analysis
  66. GRB 151027A: continued GMG observation
  67. GRB 151027B: RATIR Observations
  68. GRB 151027B: MASTER-NET early OT detection
  69. GRB 151027A: LCOGT-McDonald afterglow observations
  70. GRB 151027B: Swift-XRT refined Analysis
  71. GRB 151027B: GROND Optical/NIR Afterglow Detection
  72. GRB 151027A: UVOT Observations
  73. GRB 151027B: NOT optical afterglow candidate
  74. GRB 151027B: Swift detection of its 1000-th burst
  75. LIGO/Virgo G194575: iPTF Optical Transient Candidates
  76. GRB 151027A: Swift-BAT refined analysis
  77. GRB 151027A: Early RAPTOR Observations
  78. LIGO/Virgo G194575: MASTER Optical Inspection
  79. GRB 151027A: GMG observation
  80. GRB 151027A: Fermi GBM observation
  81. GRB 151027A: Swift-XRT refined Analysis
  82. LIGO/Virgo G194575: Swift observations of LSQ15bjb
  83. LIGO/Virgo G194575: INAF-TNG spectra of LSQ15bjb
  84. LIGO/Virgo G194575: further Pan-STARRS observations of the RA=1hr localisation region
  85. Tentative redshift for GRB 151027A from Swift-XRT data
  86. GRB 151027A: P60 afterglow confirmation and rebrightening
  87. GRB 151027A : ISON-NM early optical detection
  88. GRB 151027A: KAIT optical afterglow confirmation
  89. GRB 151027A: Swift detection of a burst with a bright optical afterglow
  90. LIGO/Virgo G194575: INAF-TNG follow-up of LSQ15bjb
  91. GRB 151006A: CALET Gamma-Ray Burst Monitor detection
  92. GRB 151021A: Skynet PROMPT-CTIO/DSO17 observations of the optical afterglow
  93. GRB 151023A: Swift-BAT refined analysis
  94. LIGO/Virgo G194575: MAXI/GSC observations
  95. LIGO/Virgo G194575: Swift observations
  96. GRB 151023A: RATIR Observations
  97. GRB 151023A: Swift-XRT refined Analysis
  98. GRB 151023A: Swift/UVOT Upper Limits
  99. GRB 151023A
  100. Possible Fermi-LAT Gamma-ray counterpart for LIGO/Virgo G194575

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