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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"

27222 results found.

  1. Swift-BAT probable detection of an outburst from SGR J1819-1600 (AX J1818.8-1559)
  2. Swift Trigger 664610: is unlikely a GRB
  3. GRB 151120A: Fermi GBM observation
  4. GRB 151120A: GROND optical/NIR afterglow
  5. GRB 151118A, Swift-BAT refined analysis
  6. GRB 151118A: ISON-NM early optical limit
  7. GRB 151118A: Swift-XRT refined Analysis
  8. GRB 151118A: Swift/UVOT Upper Limits
  9. GRB GRB 151118A: MASTER-NET optical observations
  10. GRB 151118A: Swift detection of a burst
  11. Swift-BAT resumption of normal operations
  12. GRB 151114A: GROND Detection of the Optical/NIR Afterglow Candidate
  13. GRB 151114A: Swift-XRT refined Analysis
  14. GRB 151107B: CALET Gamma-Ray Burst Monitor detection
  15. GRB 151114A: Swift-BAT refined analysis
  16. GRB 151112A: GROND photometric redshift and i'-band prediction
  17. GRB 151114A: Swift/UVOT Detection
  18. GRB 151114A: LCOGT-FTS afterglow observations
  19. GRB 151114A: Swift detection of a burst with an optical counterpart
  20. GRB 151111A: GROND confirmation of the afterglow and photometric redshift estimate
  21. GRB 151112A: Swift/UVOT Upper Limits
  22. GRB 151112A: GROND Detection of the Optical/NIR Afterglow Candidate
  23. GRB 151112A: Swift-XRT refined Analysis
  24. GRB 151112A: Swift-BAT refined analysis
  25. GRB 151112A: MASTER-NET optical limit
  26. GRB 151112A: initial UVOT observations
  27. GRB 151112A: Swift-XRT observations
  28. GRB 151112A: Swift detection of a burst
  29. GRB 151111A: Swift/UVOT upper limits
  30. Swift-BAT trigger 663164 is not a burst.
  31. GRB 151111A: GROND marginal detection of a afterglow candidate
  32. GRB 151111A: Swift-XRT refined Analysis
  33. GRB 151111A: Fermi GBM observation
  34. GRB 151111A: LCOGT-FTS afterglow observations
  35. GRB 151111A: Swift-BAT refined analysis
  36. GRB 151111A: Swift detection of a burst
  37. GRB 151107B: MASTER-NET OT detection inside the FERMI error box
  38. GRB 151107B: Mini-MegaTORTORA limits on simultaneous optical emission
  39. LIGO/Virgo G194575: La Silla QUEST, Pan-STARRS and PESSTO observations of iPTF15dld
  40. GRB 151107A: Further investigation of the source nature
  41. GRB 151107B
  42. LIGO/Virgo G194575: Swift observations if iPTF15dld
  43. GRB 151107A, Swift-BAT refined analysis
  44. LIGO/Virgo G194575: INAF-TNG/Asiago Telescope follow-up of iPTF15dld
  45. GRB 151107A: MASTER-NET optical observations
  46. GRB 151107A: Swift detection of a possible burst
  47. LIGO/Virgo G194575: INAF-Asiago Telescope follow-up of iPTF candidates
  48. LIGO/Virgo G194575: MAXI/GSC further analysis
  49. GRB 151029A: FRAM optical afterglow detection
  50. GRB 151031A: GROND observation
  51. GRB 151027B: ATCA radio detection
  52. GRB 151031A: Swift/UVOT Detection
  53. GRB 151030A: Fermi GBM observation
  54. GRB 151031A: Swift-XRT refined Analysis
  55. GRB 151027B: RATIR Late-Time Upper Limits
  56. GRB 151031A: Swift-BAT refined analysis
  57. GRB 151031A: Swift detection of a burst
  58. LIGO/Virgo G194575: INAF-TNG follow-up of iPTF15dkm and iPTF15dlj
  59. Correction to the Trigger Time for Swift GRB 151029A
  60. GRB 151029A: Swift-XRT refined Analysis
  61. GRB 151029A: Swift/UVOT Detection
  62. GRB 151029A: LCOGT-FTS afterglow observations
  63. GRB 151029A: Swift-BAT refined analysis
  64. GRB 151027A: MAXI/GSC detection
  65. GRB 151029A: GROND afterglow observations
  66. GRB 151029A: Swift detection of a burst with an optical counterpart
  67. GRB 151027A: SAO RAS optical observations
  68. GRB 151027B: LCOGT FTN afterglow observations
  69. GRB 151027A: T100 observations
  70. GRB 151027B: Swift/UVOT Upper Limits
  71. Konus-Wind observation of GRB 151027A
  72. GRB 151027B: Swift-BAT refined analysis
  73. GRB 151027A: continued GMG observation
  74. GRB 151027B: RATIR Observations
  75. GRB 151027B: MASTER-NET early OT detection
  76. GRB 151027A: LCOGT-McDonald afterglow observations
  77. GRB 151027B: Swift-XRT refined Analysis
  78. GRB 151027B: GROND Optical/NIR Afterglow Detection
  79. GRB 151027A: UVOT Observations
  80. GRB 151027B: NOT optical afterglow candidate
  81. GRB 151027B: Swift detection of its 1000-th burst
  82. LIGO/Virgo G194575: iPTF Optical Transient Candidates
  83. GRB 151027A: Swift-BAT refined analysis
  84. GRB 151027A: Early RAPTOR Observations
  85. LIGO/Virgo G194575: MASTER Optical Inspection
  86. GRB 151027A: GMG observation
  87. GRB 151027A: Fermi GBM observation
  88. GRB 151027A: Swift-XRT refined Analysis
  89. LIGO/Virgo G194575: Swift observations of LSQ15bjb
  90. LIGO/Virgo G194575: INAF-TNG spectra of LSQ15bjb
  91. LIGO/Virgo G194575: further Pan-STARRS observations of the RA=1hr localisation region
  92. Tentative redshift for GRB 151027A from Swift-XRT data
  93. GRB 151027A: P60 afterglow confirmation and rebrightening
  94. GRB 151027A : ISON-NM early optical detection
  95. GRB 151027A: KAIT optical afterglow confirmation
  96. GRB 151027A: Swift detection of a burst with a bright optical afterglow
  97. LIGO/Virgo G194575: INAF-TNG follow-up of LSQ15bjb
  98. GRB 151006A: CALET Gamma-Ray Burst Monitor detection
  99. GRB 151021A: Skynet PROMPT-CTIO/DSO17 observations of the optical afterglow
  100. GRB 151023A: Swift-BAT refined analysis

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