Skip to main content
JSON Notices via Email, Kafka Cron Jobs, Submitter Profile, GCN is Hiring. See news and announcements

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"

39404 results found.

  1. Konus-Wind observation of GRB 120624B
  2. GRB 120624B: Swift detection of a burst
  3. GRB 120624A: Fermi GBM observation
  4. GRB 120624B: Fermi-LAT Detection
  5. Konus-Wind observation of GRB 120624A
  6. GRB 120624B: Fermi GBM detection
  7. IPN Triangulation of GRB 120624A (short/intense)
  8. Swift Trigger 524949: Noise fluctuation near a galaxy
  9. GRB 120622A: MAXI/GSC detection
  10. Swift trigger 524642 / SwJ1910.2-0546
  11. GRB 120602A: Suzaku WAM observation of the prompt emission
  12. Konus-Wind observation of GRB 120617A
  13. IPN Triangulation of GRB 120617A (short/intense)
  14. Swift triggers (#524542) on a Galactic source
  15. Konus-Wind observation of GRB 120602A
  16. IPN Triangulation of GRB 120602A (long/very bright)
  17. GRB 120614A: MAXI/GSC detection of a burst
  18. GRB 120612A: optical observations
  19. GRB 120612A: Swift/UVOT observations
  20. GRB 120612A: Swift-XRT refined Analysis
  21. GRB 120612A: Swift-BAT refined analysis
  22. GRB 120612A: Enhanced Swift-XRT position
  23. GRB 120612A: BOOTES-3 optical upper limit
  24. GRB 120612A: Swift detection of a burst
  25. GRB 120603A: Suzaku WAM observation of the prompt emission
  26. Konus-Wind observation of GRB 120603A
  27. IPN Triangulation of short GRB 120603A
  28. Fermi GBM trigger 120602.539 is not a GRB
  29. Konus-Wind observation of GRB 120528B
  30. GRB 120519A: Suzaku WAM observation of the prompt emission
  31. GRB 120528C: MAXI/GSC detection
  32. GRB 120521C redshift estimate
  33. Fermi Gamma-ray Burst Monitor trigger 120527.573 is not a GRB
  34. GRB 120528B: MAXI/GSC detection
  35. GRB 120512A: Suzaku WAM observation of the prompt emission
  36. GRB 120521C: EVLA Localization of Afterglow
  37. GRB 120521C: EVLA 22 GHz Detection
  38. GRB120521B: SSO 2.3m upper limits
  39. Konus-Wind observation of GRB 120522A
  40. IPN triangulation of GRB 120522A (long/intense)
  41. GRB 120521B: Fermi GBM observation
  42. GRB 120521A: ATCA 34GHz upper limit
  43. GRB 120521C: Early Tautenburg limits
  44. GRB 120521C: EVLA 22 GHz Upper Limit
  45. GRB 120521A: GROND Upper limits
  46. GRB 120521C: Swift-XRT refined Analysis
  47. GRB 120521C: Swift-BAT refined analysis
  48. GRB 120521C: Keck Observations
  49. GRB 120521C: Swift/UVOT Upper Limits
  50. GRB 120521B: Swift/UVOT Upper Limits
  51. GRB 120521C: MASTER optical limit
  52. GRB 120521B: GROND Upper limits
  53. GRB 120521A: XRT light curve (Correction to GCN 13326)
  54. GRB 120521A: Swift-XRT refined Analysis
  55. GRB 120521C: PAIRITEL NIR Upper Limits
  56. GRB 120521C: Enhanced Swift-XRT position
  57. GRB 120521C: BOOTES-1 optical observations
  58. GRB 120521C: WHT optical observations
  59. GRB 120521C - NOT optical limits
  60. GRB120521C: Liverpool Telescope observations
  61. GRB 120521C: TAROT Calern observatory optical observations
  62. GRB 120521C: Swift detection of a burst
  63. GRB 120521B: Swift-BAT refined analysis
  64. GRB 120521B: Swift-XRT refined Analysis
  65. Konus-Wind observation of GRB 120519A
  66. Swift starts a new program to find fainter transients
  67. IPN Triangulation of GRB 120519A (short/hard)
  68. GRB 120521A: Swift/UVOT Upper Limits
  69. GRB 120521B: Enhanced Swift-XRT position
  70. GRB 120521A: Swift-BAT refined analysis
  71. GRB 120521B/Fermi Trigger 359284074: early MASTER-ICATE optical limit
  72. GRB 120521B: TAROT La Silla observatory optical observations
  73. GRB 120521B: Swift detection of a burst
  74. GRB 120521A: Enhanced Swift-XRT position
  75. GRB 120521A: TAROT La Silla observatory optical observations
  76. GRB 120521A: Swift detection of a short burst
  77. GRB 120514A : Suzaku WAM observation of the prompt emission
  78. GRB 120512A: A long GRB detected by INTEGRAL
  79. GRB 120514A: GROND upper limits
  80. GRB 120514A: Swift/UVOT Upper Limits
  81. GRB 120514A: UKIRT IR observations
  82. Konus-Wind observation of GRB 120510A
  83. GRB 120514A: Swift-XRT refined Analysis
  84. GRB 120514A: APEX observations of the submm counterpart
  85. GRB 120514A: Enhanced Swift-XRT position
  86. GRB 120514A: Swift-BAT refined analysis
  87. GRB 120514A: TAROT Calern observatory optical observations
  88. GRB 120514A: Swift detection of a burst
  89. GRB 120422A: Konkoly optical observations
  90. Fermi GBM Trigger 358364818 is not a GRB
  91. GRB 120510B/Fermi Trigger 358364818: MASTER possible OT candidate
  92. GRB 120510A: Swift XRT and UVOT observations
  93. GRB 120510A: MASTER follow up observations
  94. GRB 120510A: MAXI/GSC detection of a burst
  95. GRB 120422A: SN identification from GTC
  96. GRB 120422A: P200 NIR detection
  97. GRB 120422A: CARMA 3mm observations
  98. GRB 120422A: VLT/X-shooter spectroscopic evidence for a SN
  99. GRB 120422A: Gemini-N detection of a supernova
  100. GRB 120422A: i-band re-brightening and possible SN detection

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
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