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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"

37579 results found.

  1. GRB 150906A: Fermi GBM detection
  2. GRB 150818A: TSHAO and SAO RAS optical observations
  3. GRB 150902A: Swift-XRT afterglow detection
  4. GRB 150902A: Swift/UVOT Upper Limits
  5. GRB 150902A: Swift-XRT observations
  6. GRB 150831A: 9.8 GHz VLA upper limits
  7. GRB 150902A: MASTER-SAAO optical observations
  8. Konus-Wind observation of GRB 150902A
  9. GRB 150901A, Swift-BAT refined analysis
  10. GRB 150902A: Swift ToO observations
  11. GRB 150902A: Fermi GBM detection
  12. GRB 150902A: Fermi-LAT detection
  13. GRB 150831B: Swift/UVOT Upper Limits
  14. Konus-Wind observation of GRB 150831A
  15. GRB 150901A: Swift detection of a burst
  16. GRB 150821A: Flattening in the UVOT light curve
  17. GRB 150831B: Swift-BAT refined analysis
  18. GRB 150831B: Swift-XRT refined Analysis
  19. GRB 150831B: MASTER-IAC early optical observations
  20. GRB 150831B: Fermi GBM detection
  21. GRB 150831A: GROND Upper Limits
  22. GRB 150831A: Swift/UVOT Upper Limits
  23. GRB 150831B: Swift-XRT observations
  24. GRB 150831A: Swift-XRT refined Analysis
  25. GRB 150831B: Swift detection of a probable burst
  26. GRB 150831A: Swift-BAT refined analysis
  27. GRB 150818A: Spectroscopic confirmation of the SN from GTC
  28. GRB 150831A: Enhanced Swift-XRT position
  29. GRB 150831A: optical upper limit ISON-SSO
  30. INTEGRAL detection of GRB 150831A
  31. GRB 150831A: Swift detection of a short burst
  32. Fermi GBM trigger 150829183 is not a GRB
  33. Fermi GBM trigger 150828520 is not a GRB
  34. Fermi GBM trigger 150827524 is not a GRB
  35. GRB 150818A: possible SN rise in light curve of Mondy observations
  36. Fermi GBM trigger 150826536 is not a GRB
  37. Konus-Wind observation of GRB 150824A
  38. IPN Triangulation of GRB 150824A
  39. GRB 150824A: Fermi GBM detection
  40. Konus-Wind observation of GRB 150821A
  41. GRB 150821A: LCOGT Siding Springs early observations
  42. Konus-Wind observation of GRB 150818A
  43. GRB 150821A: LCOGT Sutherland observations
  44. GRB 150821A, Swift-BAT refined analysis
  45. GRB 150821A: GROND afterglow observations
  46. GRB 150821A: Swift-XRT refined Analysis
  47. GRB 150819A: Mondy and TSHAO optical upper limits
  48. GRB 150821A: Swift/UVOT Detection
  49. GRB 150821A: Enhanced Swift-XRT position
  50. GRB 150821A: Fermi GBM detection
  51. GRB 150818A: continued Mondy optical observations
  52. GRB 150821A: VLT/X-shooter redshift
  53. GRB 150821A: Swift detection of a burst with an optical afterglow
  54. GRB 120729A: KAIT Optical Observations
  55. KAIT Optical Upper Limits for GRB 120422A, 120724A, 120803B, 120911A, and 120923A
  56. GRB 150818A: Mondy optical observations
  57. GRB150819A: NOT imaging
  58. Konus-Wind observation of GRB 150819B
  59. GRB 150818A: Continued NOT monitoring - afterglow confirmation
  60. GRB 150819B: Fermi GBM detection
  61. GRB 150818A: 10.4m GTC spectroscopy and host galaxy
  62. IPN Triangulation of GRB 150819B (short / very intense)
  63. GRB 150818A: Mondy optical observations
  64. GRB 150818A: MITSuME Ishigakijima upper limits
  65. GRB 150819A: RATIR Optical Observations
  66. GRB 150819A: Swift-XRT refined Analysis
  67. GRB 150818A: MITSuME Akeno optical upper limits
  68. GRB 150819A: Swift-BAT refined analysis
  69. GRB 150819A: MASTER-IAC early upper limit
  70. GRB 150819A: Swift/UVOT Upper Limits
  71. GRB 150819A: Enhanced Swift-XRT position
  72. GRB 150818A: Swift-XRT update, correction to GCN 18162
  73. GRB 150819A: Prompt enhanced Swift-XRT position
  74. GRB150818A: NOT imaging
  75. GRB 150819A: Swift detection of a burst
  76. GRB 150818A: Swift-XRT refined Analysis
  77. GRB 150818A: Swift/UVOT Detection
  78. GRB 150817A: AAO optical observations
  79. GRB 150818A: Enhanced Swift-XRT position
  80. GRB 150817A: LCOGT observations
  81. GRB 150818A: Swift-BAT refined analysis
  82. GRB 150817A: Continued RATIR Optical Observations - Afterglow Confirmation
  83. GRB 150818A: Swift/UVOT candidate afterglow
  84. GRB 150818A: Planned XMM-Newton observation
  85. GRB 150817A: P60 Observations
  86. GRB 150818A: Swift detection of a burst
  87. MASTER OT inside bright ESO240-010 galaxy detection during FERMI trigger GRB150816.83 inspection
  88. GRB 150817A: Swift/UVOT Upper Limits
  89. GRB 150817A: Fermi GBM observation
  90. GRB 150817A: Swift-BAT refined analysis
  91. GRB 150817A: Swift-XRT refined Analysis
  92. GRB 150817A: Enhanced Swift-XRT position
  93. GRB 150817A: Continued RATIR Observations, Revised Candidate
  94. GRB 150817A: RATIR Optical Afterglow Candidate
  95. GRB 150817A: Swift detection of a burst
  96. Fermi GBM Trigger 150815694 is not a GRB
  97. GRB 150811A: Continued RATIR Observations
  98. GRB 150811A: Continued RATIR Observations
  99. GBM Trigger 150813665 is not a GRB
  100. Konus-Wind observation of GRB 150811B

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