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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"

37581 results found.

  1. GRB 151001A: Swift-XRT refined Analysis
  2. GRB 151001B: Enhanced Swift-XRT position
  3. GRB 151001A: Enhanced Swift-XRT position
  4. GRB 151001A: Fermi GBM detection
  5. GRB 151001B: Swift detection of a burst
  6. GRB 151001A: Swift detection of a burst with an optical counterpart
  7. GRB 150925A: Swift/UVOT Upper Limits
  8. GRB 150925A: Swift-BAT refined analysis
  9. GRB 150925A: Swift-XRT refined Analysis
  10. GRB 150925A: Enhanced Swift-XRT position
  11. GRB 150925A: Swift detection of a burst
  12. Konus-Wind observation of GRB 150922A
  13. GRB 150922A: Fermi GBM observation
  14. IPN Triangulation of GRB 150922A (short/hard)
  15. Konus-Wind observation of GRB 150919A
  16. IPN Triangulation of GRB 150919A (short / hard)
  17. LIGO/Virgo G184098: INTEGRAL search of temporally coincident prompt hard X-ray emission
  18. ANTARES neutrino detection: Fermi GBM Observations
  19. Fermi GBM trigger bn150920977 is not due to a GRB
  20. LIGO/Virgo G184098: DESGW followup program
  21. LIGO/Virgo G184098: DESGW followup program
  22. LIGO/Virgo G184098: Fermi-GBM ground-based follow-up
  23. GRB 150915A: Swift-XRT refined Analysis
  24. GRB 150915A, Swift-BAT refined analysis
  25. GRB 150910A: AAO optical observations
  26. Konus-Wind observation of GRB 150911A
  27. GRB 000000: test of sernum on the original circular
  28. GRB 150915A: NOT observations of a brightening afterglow
  29. GRB 150915A: Swift UVOT upper limits
  30. GRB 150906B: Further analysis of the Konus-Wind data
  31. GRB 150910A: Mt. Terskol observatory optical observations
  32. GRB 150910A: TSHAO optical observations
  33. GRB 150915A: VLT/X-shooter redshift
  34. GRB 150915A: GROND detection of an optical counterpart candidate
  35. GRB 150915A: MASTER-NET optical observations
  36. GRB 150915A: Swift detection of a burst
  37. GRB 150910A: T100 observations
  38. GRB 150911A: GROND Upper Limits
  39. GRB 150910A: Continued RATIR Observations
  40. GRB 150907A: Swift-XRT afterglow detection
  41. GRB 150912A: Swift-XRT and UVOT observations
  42. GRB 150911A: Chuguev observatory upper limit
  43. GRB 150911A: Mt. Terskol observatory upper limit
  44. GRB 150911A: Khureltogot upper limit
  45. GRB 150910A: Mt. Terskol observatory optical observation
  46. Fermi GBM trigger 463890496/150914103 is not a GRB
  47. GRB 150912A: MITSuME Ishigakijima upper limits
  48. GRB 150911A: WHT optical imaging
  49. GRB 150910A: RATIR Observations
  50. GRB 150910A: MITSuME Ishigakijima Optical Observation after 2 days
  51. GRB 150912A: MASTER-IAC optical observations
  52. GRB 150912A: Fermi GBM observation
  53. GRB 150906B - NGC 3313 association: Constraints from Ep-Eiso and Ep-Liso Relations
  54. GRB 150912A: Swift ToO observations
  55. GRB 150906B: theoretical estimation of redshift and isotropic energy
  56. GRB150910A: P60 Observations
  57. GRB 150911A: Swift/UVOT Upper Limits
  58. GRB 150911A: Swift-BAT refined analysis
  59. GRB 150912A: A long GRB detected by INTEGRAL
  60. GRB 150911A: Swift-XRT refined Analysis
  61. GRB 150910A: AAO optical observations
  62. GRB 150910A: MITSuME Ishigakijima Optical Observation after 1 day
  63. GRB 150910A: Chuguev observatory optical observations
  64. GRB 150911A: MITSuME Okayama upper limits
  65. GRB 150910A: VLA Detection
  66. GRB 150910A: continued SAO RAS optical observations
  67. GRB 150911A: Enhanced Swift-XRT position
  68. GRB 150910A: TSHAO optical observations
  69. GRB 150911A: Swift detection of a burst
  70. GRB 150910A: NOT observations of the afterglow
  71. GRB 150910A: MITSuME Okayama Ks-band Observation
  72. GRB 150910A: GROND observation of the afterglow
  73. GRB 150910A: MITSuME Ishigakijima Optical Observation
  74. GRB 150910A: SAO RAS optical photometry
  75. GRB 150910A: Redshift from 10.4m GTC+OSIRIS
  76. GRB 150910A: Kast spectroscopy from 3m Shane telescope
  77. GRB 150910A: Swift-XRT refined Analysis
  78. GRB 150910A: Enhanced Swift-XRT position
  79. GRB 150910A: Swift/UVOT Detection of a Brightening Afterglow
  80. GRB 150910A: Nanshan optical observations
  81. GRB 150910A: Swift-BAT refined analysis
  82. GRB 150910A: MITSuME Okayama Optical Observation
  83. GRB 150910A: LCOGT FTN afterglow observations
  84. GRB 150910A: KAIT Optical Afterglow Detection
  85. GRB 150910A: Swift detection of a burst with an optical afterglow
  86. Short GRB 150906B: proximity to NGC 3313 galaxy group
  87. Fermi GBM trigger 463422723/150908689 is not a GRB
  88. GRB 150907B: Swift-XRT refined Analysis
  89. Konus-Wind observation of GRB 150906B
  90. IPN Triangulation of GRB 150906B (short/intense)
  91. Fermi GBM trigger 463339482/150907725 is too weak to be classified
  92. GRB 150907B: Swift-BAT refined analysis
  93. GRB150907A: Swift/UVOT observations
  94. GRB 150907B: MASTER-SAAO early optical observations
  95. GRB 150907B: Enhanced Swift-XRT position
  96. GRB 150907B: GROND Upper Limits
  97. GRB 150907B: Swift-XRT observations
  98. GRB 150907A: Swift-XRT observations
  99. GRB 150907B: Swift detection of a burst
  100. Fermi GBM trigger 150907763 is not a GRB

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