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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"

19594 results found.

  1. GRB 151118A: Swift detection of a burst
  2. GRB151027A; Optical observations
  3. GRB 151114A: GROND Detection of the Optical/NIR Afterglow Candidate
  4. GRB 151114A: Swift/UVOT Detection
  5. GRB 151114A: Enhanced Swift-XRT position
  6. GRB 151114A: Swift detection of a burst with an optical counterpart
  7. GRB 151111A: GROND confirmation of the afterglow and photometric redshift estimate
  8. GRB 151112A: Swift/UVOT Upper Limits
  9. GRB 151112A: GROND Detection of the Optical/NIR Afterglow Candidate
  10. GRB 151112A: Enhanced Swift-XRT position
  11. GRB 151112A: initial UVOT observations
  12. GRB 151112A: Swift-XRT observations
  13. GRB 151111A: Swift/UVOT upper limits
  14. Swift-BAT trigger 663164 is not a burst.
  15. GRB 151111A: GROND marginal detection of a afterglow candidate
  16. GRB 151111A: Swift-XRT refined Analysis
  17. GRB 151111A: Fermi GBM observation
  18. GRB 151111A: Enhanced Swift-XRT position
  19. GRB 151111A: Swift detection of a burst
  20. GRB 151107B: Mini-MegaTORTORA limits on simultaneous optical emission
  21. GRB 151107A: Further investigation of the source nature
  22. GRB 151027A: Mt. Terskol observatory optical observation
  23. LIGO/Virgo G194575: MAXI/GSC further analysis
  24. GRB 150910A: CrAO optical observations
  25. GRB 151027A: the missing GeV component
  26. GRB 151031A: GROND observation
  27. GRB 151027B: ATCA radio detection
  28. GRB 151031A
  29. GRB 151031A: Swift/UVOT Detection
  30. GRB 151027B: RATIR Late-Time Upper Limits
  31. GRB 151031A: Enhanced Swift-XRT position
  32. GRB 151031A: VLT/X-shooter optical counterpart and redshift
  33. GRB 151031A: Swift detection of a burst
  34. GRB 151029A: MITSuME Ishigakijima upper limits
  35. GRB 151027A: Optical counterpart detection
  36. GRB 151029A: Swift/UVOT Detection
  37. GRB 151029A: Enhanced Swift-XRT position
  38. GRB 151029A: GROND afterglow observations
  39. GRB 151027A: SAO RAS optical observations
  40. GRB 151027A: NOT optical and NIR observations
  41. GRB 151027A: T100 observations
  42. GRB 151027B: Swift/UVOT Upper Limits
  43. GRB 151027A: continued GMG observation
  44. GRB 151027B: RATIR Observations
  45. GRB 151027B: Swift-XRT refined Analysis
  46. GRB 151027B: GROND Optical/NIR Afterglow Detection
  47. GRB 151027B: Enhanced Swift-XRT position
  48. GRB 151027A: UVOT Observations
  49. GRB 151027B: NOT optical afterglow candidate
  50. GRB 151027B: Swift detection of its 1000-th burst
  51. LIGO/Virgo O1 extended until January 12
  52. GRB 151027A: Early RAPTOR Observations
  53. GRB 151027A: GMG observation
  54. GRB 151027A: MITSuME Akeno Optical observation
  55. GRB 151027A: Weihai optical observations
  56. GRB 151027A: Enhanced Swift-XRT position
  57. GRB 151027A : ISON-NM early optical detection
  58. GRB 151027A: Swift detection of a burst with a bright optical afterglow
  59. LIGO/Virgo G194575: ASKAP followup
  60. LIGO/Virgo G184098: VLA follow-up of iPTF15cyk
  61. GRB 151021A: Skynet PROMPT-CTIO/DSO17 observations of the optical afterglow
  62. LIGO/Virgo G194575: Near-infrared follow-up with OAO-WFC
  63. LIGO/Virgo G194575: Kanata/J-GEM optical follow-up
  64. GRB 151022A: OSN optical upper limit
  65. GRB 151023A: RATIR Observations
  66. GRB 151023A: Swift/UVOT Upper Limits
  67. GRB 151023A
  68. LIGO/Virgo G194575: CQUEAN/LOAO observations
  69. GRB 151023A: Enhanced Swift-XRT position
  70. LIGO/Virgo G194575: LOFAR follow-up
  71. GRB 151022A: Swift/UVOT Upper Limits
  72. LIGO/Virgo G194575: RATIR Observations of Nearby Galaxies in the 1sigma Error Region
  73. LIGO Virgo G194575: MWA Observations
  74. LIGO/Virgo G194575: INTEGRAL search of temporally coincident prompt hard X-ray emission
  75. LIGO/Virgo G194575: RATIR Observations of Nearby Galaxies in the 1sigma Error Region
  76. LIGO/Virgo G194575: more details on transients from Pan-STARRS in the RA=1hr localisation region
  77. GRB 151023A: Swift detection of a burst
  78. GRB 151022A: RATIR Upper Limits
  79. LIGO/Virgo G194575: Fermi GBM Observations
  80. GRB 151022A: MITSuME Okayama upper limits
  81. LIGO/Virgo G194575: Mini-MegaTORTORA observations
  82. GRB 151022A: Enhanced Swift-XRT position
  83. GRB 151022A: Mondy optical upper limit
  84. GRB 151022A: MITSuME Okayama Ks-band upper-limit
  85. GRB 151022A: Swift detection of a burst
  86. GRB 151021A: MITSuME Okayama Ks-band upper-limit
  87. GRB 151021A: Swift/UVOT Detection
  88. GRB 151021A: MITSuME Okayama upper limits
  89. GRB 151021A: Enhanced Swift-XRT position
  90. GRB 151021A: Optical counterpart and redshift from X-shooter
  91. GRB 151021A: Swift detection of a burst
  92. LIGO/Virgo G184098: LOFAR follow-up
  93. GRB 151004A: Swift-XRT follow-up observations
  94. Trigger 659734: Swift detection of SAX J1750.8-2900 or other source near Galactic center
  95. GRB 151006A: Mondy optical upper limit
  96. GRB 151006A: OSN optical upper limit
  97. GRB 151006A: MITSuME Okayama Ks-band upper-limit
  98. GRB 151006A: Fermi-LAT detection
  99. GRB 151006A: Swift/UVOT Upper Limits
  100. GRB 151006A: Enhanced Swift-XRT position

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