Skip to main content
GCN at AAS 245, Legacy Circulars Address Retirement. See news and announcements

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').

18064 results found.

  1. GRB 080928: Enhanced Swift-XRT position
  2. GRB 080928, Swift-BAT initial refined analysis
  3. GRB 080928A: ROTSE-III Confirmation of Optical Counterpart
  4. GRB 080928: Swift detection of a burst with an optical counterpart
  5. Swift-BAT trigger 325707 is not a GRB
  6. Swift trigger 325707: Swift/UVOT Upper Limits
  7. Swift trigger 325707: Swift-XRT upper limit
  8. Swift detection of a possible GRB (trigger 325707)
  9. GRB080916A: Suzaku WAM observation of the prompt emission
  10. GRB 080922: Swift/UVOT Upper Limits
  11. GRB080922: Swift-XRT upper limit
  12. Trigger 324561: IGR J08408-4503 detected by Swift
  13. GRB 080919: Swift/UVOT Refined Analysis
  14. GRB 080919: Swift-XRT refined analysis
  15. GRB 080919, Swift-BAT refined analysis
  16. GRB 080919: Swift detection of a short burst
  17. GRB080913: Swift-BAT spectral lag
  18. SGR 0501+4516: preliminary results of the Suzaku ToO observation
  19. GRB 080916A: Fermi GBM detection
  20. GRB 080916C: Swift UVOT Refined Analysis
  21. GRB 080916C: Swift XRT refined analysis
  22. GRB 080916B: Swift-XRT refined analysis
  23. Konus-Wind observation of GRB 080916A
  24. GRB 080916C: GROND Detection of the Optical Afterglow Candidate
  25. GRB 080913: Konus-Wind and Swift/BAT joint spectral analysis
  26. GRB 080916C: Enhanced XRT position
  27. GRB 080916C: Swift/XRT detection of possible afterglow
  28. GRB 080916B: Swift UVOT Refined Analysis
  29. GRB 080916B, Swift-BAT refined analysis
  30. GRB080916A: Refined Swift/UVOT Observations
  31. GRB 080916B: Enhanced Swift-XRT position
  32. GRB 080916A: Swift XRT refined analysis
  33. GRB 080916A, Swift-BAT refined analysis
  34. GRB 080916B: Swift-XRT afterglow detection
  35. GRB 080916A: Enhanced Swift-XRT position
  36. GRB 080916B: Swift detection of a burst
  37. GRB 080916: Swift detection of a burst with optical afterglow
  38. GRB 080915B, Swift-BAT refined analysis
  39. GRB 080915B: Swift detection of a burst
  40. GRB 080915: Swift/UVOT Upper Limits
  41. GRB 080915: Swift-XRT afterglow detection and analysis
  42. GRB 080915, Swift-BAT refined analysis
  43. GRB 080915: ROTSE-III Optical Limits
  44. GRB 080915: Swift detection of a burst
  45. GRB 080913: Swift-XRT refined analysis
  46. GRB080913: Swift/UVOT Upper Limits
  47. GRB 080913: GROND photo-z
  48. GRB 080913, Swift-BAT refined analysis
  49. GRB 080913: VLT/FORS2 observations
  50. GRB 080913: Enhanced Swift-XRT position
  51. GRB 080913: GROND observation of a high-z optical/NIR afterglow candidate
  52. GRB 080913: Swift detection of a burst
  53. GRB 080906: Watcher observations
  54. Swift-BAT/-XRT refined analysis on trigger 324362 (LS I +61 303)
  55. SGR J0501+4516: radio pulsar searches with GBT and WSRT
  56. Swift trigger 324362 (LS I +61 303 ?): XRT
  57. GRB 080905B: Photometric Redshift for the 2MASS Galaxy
  58. Swift trigger 324362 (LS I +61 303 ?)
  59. GRB080905A: Swift/UVOT Upper Limits
  60. GRB 080905B: Watcher optical detection
  61. GRB 080905B: Fermi Gamma-ray Burst Monitor detection
  62. GRB 080905A: Fermi Gamma-ray Burst Monitor detection
  63. GRB 080905A: Enhanced Swift-XRT position
  64. Swift Trigger 324122 is again known source Swift J1842.5-1124
  65. Swift Trigger 324116 is known source again
  66. Swift Trigger 324112 is known source Swift J1842.5-1124
  67. GRB 080906: Refined Swift/UVOT Observations
  68. GRB 080906: Swift-XRT Refined Analysis
  69. GRB 080906, Swift-BAT refined analysis
  70. GRB 080906: GROND observations of the optical/NIR afterglow
  71. GRB 080905B: Swift-XRT Refined Analysis
  72. GRB 080905B: Refined UVOT Analysis
  73. GRB 080905B: Enhanced Swift-XRT position
  74. GRB 080905B, Swift-BAT refined analysis
  75. GRB 080905A, Swift-BAT refined analysis
  76. GRB 080906: Swift detection of a burst with optical afterglow
  77. GRB 080905A: Swift-XRT Refined Analysis
  78. GRB 080905B: Swift detection of a burst with possible optical counterpart
  79. GRB 080905: R & I-band optical observations
  80. GRB 080905: Swift detection of a probably-short burst
  81. GRB 080903: Swift/UVOT Observations
  82. GRB 080903: Swift-XRT Refined Analysis
  83. GRB 080903: Enhanced Swift-XRT position
  84. GRB 080903, Swift-BAT refined analysis
  85. GRB 080903: Astrotel-Caucasus optical observations
  86. GRB 080903: TAROT Calern observatory optical observations
  87. GRB 080903: ROTSE-III Optical Limits
  88. GRB 080903: Swift detection of a burst
  89. SGR 0501+4516: preliminary results of the first XMM-Newton observation
  90. GRB080828: Swift/UVOT Upper Limits
  91. GRB080825B: Swift/UVOT Upper Limits
  92. GRB 080828: Swift-XRT detection of a possible X-ray afterglow
  93. Swift-BAT trigger 322590 is not a GRB
  94. Swift trigger 322590: BAT detection of a possible burst
  95. SGR 0501+4516: Decline in Activity
  96. SGR 0501+4516: Proximity to supernova remnant HB9
  97. Enhanced Swift-XRT position of SGR 0501+4516
  98. SGR 0501+4516: Swift XRT measure of the spin period
  99. GRB 080825B: Swift-XRT team analysis
  100. Soft Gamma Repeater SGR 0501+4516: GBM Detection of multiple bursts

Advanced

Download all Circulars as a .tar.gz archive:
Questions or comments?
Contact GCN directly.
Have you found a bug in GCN?
Open an issue.
Want to contribute code to GCN?
Get involved on GitHub.

gcn.nasa.gov

A service of the Astrophysics Science Division at NASA Goddard Space Flight Center

Looking for U.S. government information and services? Visit USA.gov