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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"

27442 results found.

  1. GRB 150907B: GROND Upper Limits
  2. GRB 150907B: Swift-XRT observations
  3. GRB 150907B: Swift detection of a burst
  4. Fermi GBM trigger 150907763 is not a GRB
  5. GRB 150906A: Fermi GBM detection
  6. ANTARES neutrino Alert150901.32 alert and Swift XRT counterpart: MASTER optical observations and new possible candidate
  7. GRB 150902A: Swift/UVOT Upper Limits
  8. GRB 150902A: MASTER-SAAO optical observations
  9. GRB 150901A, Swift-BAT refined analysis
  10. GRB 150902A: Fermi GBM detection
  11. GRB 150902A: Fermi-LAT detection
  12. GRB 150831B: Swift/UVOT Upper Limits
  13. Konus-Wind observation of GRB 150831A
  14. GRB 150901A: Swift detection of a burst
  15. GRB 150831B: Swift-BAT refined analysis
  16. GRB 150831B: Swift-XRT refined Analysis
  17. GRB 150831B: MASTER-IAC early optical observations
  18. GRB 150831B: Fermi GBM detection
  19. GRB 150831A: GROND Upper Limits
  20. GRB 150831A: Swift/UVOT Upper Limits
  21. GRB 150831B: Swift-XRT observations
  22. GRB 150831A: Swift-XRT refined Analysis
  23. GRB 150831B: Swift detection of a probable burst
  24. GRB 150831A: Swift-BAT refined analysis
  25. GRB 150831A: optical upper limit ISON-SSO
  26. GRB 150831A: Swift detection of a short burst
  27. Fermi GBM trigger 150829183 is not a GRB
  28. Fermi GBM trigger 150828520 is not a GRB
  29. Fermi GBM trigger 150827524 is not a GRB
  30. Fermi GBM trigger 150826536 is not a GRB
  31. GRB 150824A: Fermi GBM detection
  32. Konus-Wind observation of GRB 150821A
  33. GRB 150821A: LCOGT Siding Springs early observations
  34. Konus-Wind observation of GRB 150818A
  35. GRB 150821A: LCOGT Sutherland observations
  36. GRB 150821A, Swift-BAT refined analysis
  37. GRB 150821A: GROND afterglow observations
  38. GRB 150821A: Swift-XRT refined Analysis
  39. GRB 150821A: Swift/UVOT Detection
  40. GRB 150821A: Fermi GBM detection
  41. Swift Trigger 652824 is due to noise
  42. GRB 150821A: VLT/X-shooter redshift
  43. GRB 150821A: Swift detection of a burst with an optical afterglow
  44. Swift Trigger 652824: Is most likely a noise fluctuation in the direction of M31
  45. GRB 150819B: Fermi GBM detection
  46. GRB 150818A: 10.4m GTC spectroscopy and host galaxy
  47. IPN Triangulation of GRB 150819B (short / very intense)
  48. GRB 150818A: Mondy optical observations
  49. GRB 150819A: RATIR Optical Observations
  50. GRB 150819A: Swift-XRT refined Analysis
  51. GRB 150819A: Swift-BAT refined analysis
  52. GRB 150819A: MASTER-IAC early upper limit
  53. GRB 150819A: Swift/UVOT Upper Limits
  54. GRB 150818A: Swift-XRT update, correction to GCN 18162
  55. GRB 150819A: Swift detection of a burst
  56. GRB 150818A: Swift-XRT refined Analysis
  57. GRB 150818A: Swift/UVOT Detection
  58. GRB 150817A: LCOGT observations
  59. GRB 150818A: Swift-BAT refined analysis
  60. GRB 150817A: Continued RATIR Optical Observations - Afterglow Confirmation
  61. GRB 150818A: Swift/UVOT candidate afterglow
  62. GRB 150817A: P60 Observations
  63. GRB 150818A: Swift detection of a burst
  64. MASTER OT inside bright ESO240-010 galaxy detection during FERMI trigger GRB150816.83 inspection
  65. GRB 150817A: Swift/UVOT Upper Limits
  66. GRB 150817A: Fermi GBM observation
  67. GRB 150817A: Swift-BAT refined analysis
  68. GRB 150817A: Swift-XRT refined Analysis
  69. GRB 150817A: Continued RATIR Observations, Revised Candidate
  70. GRB 150817A: RATIR Optical Afterglow Candidate
  71. GRB 150817A: Swift detection of a burst
  72. Fermi GBM Trigger 150815694 is not a GRB
  73. GRB 150811A: Continued RATIR Observations
  74. GRB 150811A: Continued RATIR Observations
  75. GBM Trigger 150813665 is not a GRB
  76. Swift Trigger 652046 is a particle shower event
  77. Swift Trigger 652046 is probably not a GRB
  78. GRB 150811A: Continued RATIR Observations
  79. GRB 150811A: Swift/UVOT further observations
  80. GRB 150811B: Fermi GBM detection
  81. GRB 150811A: Swift-BAT refined analysis
  82. GRB 150811A: SAO RAS optical observations
  83. GRB 150811A: Swift-XRT refined Analysis
  84. GRB 150810A: Fermi GBM detection
  85. GRB 150811A: P60 Observations
  86. GRB 150811A: LCOGT-McDonald afterglow detection
  87. GRB 150811A: Swift/UVOT Detection
  88. GRB 150811A: RATIR Optical Afterglow Detection
  89. GRB 150811A: Swift detection of a burst
  90. Fermi GBM GRB Trigger 460608875: iPTF P48 Observations
  91. Fermi GBM trigger 150807969 is not a GRB
  92. Fermi GBM trigger 150806450 is not a GRB
  93. Fermi GBM trigger 150805556 is not a GRB
  94. GRB 150801B: Swift/UVOT Upper Limits
  95. GRB 150801B: Swift-BAT refined analysis
  96. GRB 150801B: Swift-XRT refined Analysis
  97. Fermi GBM GRB Trigger 458852670: iPTF P48 Observations
  98. GRB 150721A (Fermi GBM Trigger 459150552): iPTF P48 Observations
  99. GRB 150801B: Swift detection of a burst
  100. GRB 150424A: HST imaging

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