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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

43606 results found.

  1. Konus-Wind observation of GRB 150831A
  2. GRB 150901A: Swift detection of a burst
  3. GRB 150821A: Flattening in the UVOT light curve
  4. GRB 150831B: Swift-BAT refined analysis
  5. GRB 150831B: Swift-XRT refined Analysis
  6. GRB 150831B: MASTER-IAC early optical observations
  7. GRB 150831B: Fermi GBM detection
  8. GRB 150831A: GROND Upper Limits
  9. GRB 150831A: Swift/UVOT Upper Limits
  10. GRB 150831B: Swift-XRT observations
  11. GRB 150831A: Swift-XRT refined Analysis
  12. GRB 150831B: Swift detection of a probable burst
  13. GRB 150831A: Swift-BAT refined analysis
  14. GRB 150818A: Spectroscopic confirmation of the SN from GTC
  15. GRB 150831A: Enhanced Swift-XRT position
  16. GRB 150831A: optical upper limit ISON-SSO
  17. INTEGRAL detection of GRB 150831A
  18. GRB 150831A: Swift detection of a short burst
  19. Fermi GBM trigger 150829183 is not a GRB
  20. Fermi GBM trigger 150828520 is not a GRB
  21. Fermi GBM trigger 150827524 is not a GRB
  22. GRB 150818A: possible SN rise in light curve of Mondy observations
  23. Fermi GBM trigger 150826536 is not a GRB
  24. Konus-Wind observation of GRB 150824A
  25. IPN Triangulation of GRB 150824A
  26. GRB 150824A: Fermi GBM detection
  27. Konus-Wind observation of GRB 150821A
  28. GRB 150821A: LCOGT Siding Springs early observations
  29. Konus-Wind observation of GRB 150818A
  30. GRB 150821A: LCOGT Sutherland observations
  31. GRB 150821A, Swift-BAT refined analysis
  32. GRB 150821A: GROND afterglow observations
  33. GRB 150821A: Swift-XRT refined Analysis
  34. GRB 150819A: Mondy and TSHAO optical upper limits
  35. GRB 150821A: Enhanced Swift-XRT position
  36. GRB 150821A: Fermi GBM detection
  37. GRB 150818A: continued Mondy optical observations
  38. Swift Trigger 652824 is due to noise
  39. GRB 150821A: VLT/X-shooter redshift
  40. GRB 150821A: Swift detection of a burst with an optical afterglow
  41. Swift Trigger 652824: Is most likely a noise fluctuation in the direction of M31
  42. GRB 120729A: KAIT Optical Observations
  43. GRB 150818A: Mondy optical observations
  44. GRB150819A: NOT imaging
  45. Konus-Wind observation of GRB 150819B
  46. GRB 150818A: Continued NOT monitoring - afterglow confirmation
  47. GRB 150819B: Fermi GBM detection
  48. GRB 150818A: 10.4m GTC spectroscopy and host galaxy
  49. IPN Triangulation of GRB 150819B (short / very intense)
  50. GRB 150818A: Mondy optical observations
  51. GRB 150819A: RATIR Optical Observations
  52. GRB 150819A: Swift-XRT refined Analysis
  53. GRB 150819A: Swift-BAT refined analysis
  54. GRB 150819A: MASTER-IAC early upper limit
  55. GRB 150819A: Swift/UVOT Upper Limits
  56. GRB 150819A: Enhanced Swift-XRT position
  57. GRB 150818A: Swift-XRT update, correction to GCN 18162
  58. GRB 150819A: Prompt enhanced Swift-XRT position
  59. GRB150818A: NOT imaging
  60. GRB 150819A: Swift detection of a burst
  61. GRB 150818A: Swift-XRT refined Analysis
  62. GRB 150818A: Swift/UVOT Detection
  63. GRB 150817A: AAO optical observations
  64. GRB 150818A: Enhanced Swift-XRT position
  65. GRB 150817A: LCOGT observations
  66. GRB 150818A: Swift-BAT refined analysis
  67. GRB 150817A: Continued RATIR Optical Observations - Afterglow Confirmation
  68. GRB 150818A: Swift/UVOT candidate afterglow
  69. GRB 150818A: Planned XMM-Newton observation
  70. GRB 150817A: P60 Observations
  71. GRB 150818A: Swift detection of a burst
  72. MASTER OT inside bright ESO240-010 galaxy detection during FERMI trigger GRB150816.83 inspection
  73. GRB 150817A: Fermi GBM observation
  74. GRB 150817A: Swift-BAT refined analysis
  75. GRB 150817A: Swift-XRT refined Analysis
  76. GRB 150817A: Enhanced Swift-XRT position
  77. GRB 150817A: Continued RATIR Observations, Revised Candidate
  78. GRB 150817A: RATIR Optical Afterglow Candidate
  79. GRB 150817A: Swift detection of a burst
  80. Fermi GBM Trigger 150815694 is not a GRB
  81. GRB 150811A: Continued RATIR Observations
  82. GRB 150811A: Continued RATIR Observations
  83. GBM Trigger 150813665 is not a GRB
  84. Swift Trigger 652046 is a particle shower event
  85. Konus-Wind observation of GRB 150811B
  86. Swift Trigger 652046 is probably not a GRB
  87. GRB 150811A: KAIT Refined Analysis
  88. GRB 150811A: VLA Detection
  89. IPN Triangulation of GRB 150811B
  90. GRB 150811A: Continued RATIR Observations
  91. GRB 150811A: Swift/UVOT further observations
  92. GRB 150811B: Fermi GBM detection
  93. GRB 150811A: Swift-BAT refined analysis
  94. GRB 150811A: SAO RAS optical observations
  95. GRB 150811A: Swift-XRT refined Analysis
  96. GRB 150810A: Fermi GBM detection
  97. GRB 150811A: P60 Observations
  98. GRB 150811A: Enhanced Swift-XRT position
  99. GRB 150811A: LCOGT-McDonald afterglow detection
  100. GRB 150811A: Swift/UVOT Detection

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