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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"

28235 results found.

  1. GRB 151112A: Swift-XRT refined Analysis
  2. GRB 151112A: Swift-BAT refined analysis
  3. GRB 151112A: Enhanced Swift-XRT position
  4. GRB 151112A: Swift-XRT observations
  5. GRB 151111A: Swift/UVOT upper limits
  6. Swift-BAT trigger 663164 is not a burst.
  7. GRB 151111A: GROND marginal detection of a afterglow candidate
  8. GRB 151111A: Swift-XRT refined Analysis
  9. GRB 151111A: Fermi GBM observation
  10. GRB 151111A: LCOGT-FTS afterglow observations
  11. GRB 151111A: Swift-BAT refined analysis
  12. GRB 151111A: Enhanced Swift-XRT position
  13. GRB 151111A: Swift detection of a burst
  14. GRB 151107B: MASTER-NET OT detection inside the FERMI error box
  15. GRB 151107B: Mini-MegaTORTORA limits on simultaneous optical emission
  16. GRB 151107A: Further investigation of the source nature
  17. GRB 151107B
  18. LIGO/Virgo G194575: Swift observations if iPTF15dld
  19. LIGO/Virgo G194575: INAF-Asiago Telescope further analysis of iPTF candidates
  20. LIGO/Virgo G194575: INAF-Asiago Telescope follow-up of iPTF candidates
  21. GRB 151027A: Mondy optical observations
  22. GRB 151027A: Mt. Terskol observatory optical observation
  23. GRB 150910A: CrAO optical observations
  24. GRB 151027A: the missing GeV component
  25. GRB 151031A: GROND observation
  26. GRB 151027B: ATCA radio detection
  27. GRB 151031A
  28. GRB 151031A: Swift/UVOT Detection
  29. GRB 151030A: Fermi GBM observation
  30. GRB 151031A: Swift-XRT refined Analysis
  31. GRB 151027B: RATIR Late-Time Upper Limits
  32. GRB 151031A: Swift-BAT refined analysis
  33. GRB 151031A: Enhanced Swift-XRT position
  34. GRB 151031A: VLT/X-shooter optical counterpart and redshift
  35. GRB 151031A: Swift detection of a burst
  36. GRB 151029A: MITSuME Ishigakijima upper limits
  37. GRB 151027A: Optical counterpart detection
  38. GRB 151029A: Swift-XRT refined Analysis
  39. GRB 151029A: Swift/UVOT Detection
  40. GRB 151029A: LCOGT-FTS afterglow observations
  41. GRB 151029A: Swift-BAT refined analysis
  42. GRB 151029A: Enhanced Swift-XRT position
  43. GRB 151029A: GROND afterglow observations
  44. GRB 151029A: Swift detection of a burst with an optical counterpart
  45. GRB 151027A: SAO RAS optical observations
  46. GRB 151027A: NOT optical and NIR observations
  47. GRB 151027A: T100 observations
  48. GRB 151027B: Swift/UVOT Upper Limits
  49. GRB 151027B: Swift-BAT refined analysis
  50. GRB 151027A: continued GMG observation
  51. GRB 151027B: RATIR Observations
  52. GRB 151027B: MASTER-NET early OT detection
  53. GRB 151027A: LCOGT-McDonald afterglow observations
  54. GRB 151027B: Swift-XRT refined Analysis
  55. GRB 151027B: GROND Optical/NIR Afterglow Detection
  56. GRB 151027B: Enhanced Swift-XRT position
  57. GRB 151027A: UVOT Observations
  58. GRB 151027B: NOT optical afterglow candidate
  59. GRB 151027B: Swift detection of its 1000-th burst
  60. LIGO/Virgo O1 extended until January 12
  61. GRB 151027A: Swift-BAT refined analysis
  62. GRB 151027A: Early RAPTOR Observations
  63. LIGO/Virgo G194575: MASTER Optical Inspection
  64. GRB 151027A: GMG observation
  65. GRB 151027A: MITSuME Akeno Optical observation
  66. GRB 151027A: Swift-XRT refined Analysis
  67. GRB 151027A: Weihai optical observations
  68. LIGO/Virgo G194575: further Pan-STARRS observations of the RA=1hr localisation region
  69. GRB 151027A: Enhanced Swift-XRT position
  70. GRB 151027A: P60 afterglow confirmation and rebrightening
  71. GRB 151027A : ISON-NM early optical detection
  72. GRB 151027A: Swift detection of a burst with a bright optical afterglow
  73. GRB 151006A: CALET Gamma-Ray Burst Monitor detection
  74. LIGO/Virgo G184098: VLA follow-up of iPTF15cyk
  75. LIGO/Virgo G194575 : La Silla - QUEST followup
  76. GRB 151021A: Skynet PROMPT-CTIO/DSO17 observations of the optical afterglow
  77. LIGO/Virgo G194575: Near-infrared follow-up with OAO-WFC
  78. LIGO/Virgo G194575: Kanata/J-GEM optical follow-up
  79. GRB 151023A: Swift-BAT refined analysis
  80. LIGO/Virgo G194575: Pi of the Sky observations
  81. GRB 151022A: OSN optical upper limit
  82. GRB 151023A: RATIR Observations
  83. GRB 151023A: Swift-XRT refined Analysis
  84. GRB 151023A: Swift/UVOT Upper Limits
  85. GRB 151023A
  86. LIGO/Virgo G194575: CQUEAN/LOAO observations
  87. GRB 151023A: Enhanced Swift-XRT position
  88. LIGO/Virgo G194575: LOFAR follow-up
  89. GRB 151022A: Swift/UVOT Upper Limits
  90. LIGO/Virgo G194575: RATIR Observations of Nearby Galaxies in the 1sigma Error Region
  91. LIGO Virgo G194575: MWA Observations
  92. LIGO/Virgo G194575: INTEGRAL search of temporally coincident prompt hard X-ray emission
  93. LIGO/Virgo G194575: RATIR Observations of Nearby Galaxies in the 1sigma Error Region
  94. GRB 151022A: Swift-BAT refined analysis
  95. LIGO/Virgo G194575: more details on transients from Pan-STARRS in the RA=1hr localisation region
  96. GRB 151023A: Swift detection of a burst
  97. GRB 151022A: RATIR Upper Limits
  98. GRB 151022A: Swift-XRT refined Analysis
  99. GRB 151022A: MITSuME Okayama upper limits
  100. LIGO/Virgo G194575: Mini-MegaTORTORA observations

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