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"

23446 results found.

  1. GRB050815: Optical afterglow detection by Swift UVOT
  2. GRB 050813: Radio Observations
  3. GRB 050815: ROTSE-III Optical Limits
  4. GRB050815: Swift-BAT detection of a burst
  5. GRB050814: Fading red source
  6. GRB050814: P60 Optical Afterglow Candidate
  7. GRB 050813: Non-fading of afterglow candidate
  8. GRB050814: SWIFT/UVOT observation
  9. GRB050814: Refined analysis of the Swift-BAT burst
  10. GRB 050814: Swift XRT Afterglow Localization
  11. GRB 050814: Swift detection of a burst
  12. GRB 050813: Magellan detection of a high redshift galaxy cluster
  13. GRB050813, SDSS pre-burst observations
  14. GRB 050813: Swift-BAT refined analysis
  15. GRB050813: SWIFT/UVOT observation
  16. GRB 050813: Swift XRT afterglow localization
  17. GRB 050813: Possible Short Swift-BAT GRB
  18. GRB050807(=H3889): An X-Ray Rich GRB Localized by HETE
  19. Ongoing activity of SGR 1806-20: an intermediate burst 050811
  20. GRB050803: CrAO optical observations, no OT candidate
  21. Detection of an intermediate burst from SGR 1806-20 on August 8
  22. GRB 050803: PROMPT BVRcIc Observations
  23. GRB 050807: ROTSE-III Optical Limits
  24. GRB 050730, optical observation
  25. GRB050805b: CrAO optical limit
  26. GRB050803, optical observations
  27. Retraction of Swift Trigger 149131 (GRB 050805B)
  28. GRB 050805b: OHP optical limits
  29. GRB 050805b: TAROT optical limits
  30. Possible GRB 050805B: Swift-BAT trigger 149131 may be a burst
  31. Swift-BAT trigger 149118 is probably not a GRB
  32. GRB050802: TNG optical observations
  33. GRB050803: Radio Observation
  34. GRB 050803: RTT150 optical observations
  35. GRB050801: Radio Observation
  36. GRB050730: Radio Detection
  37. GRB050803: CrAO optical observations, possible OT candidate
  38. GRB050803: Optical/UV Upper Limits from Swift-UVOT
  39. GRB 050803: Keck Observations
  40. GRB 050803: Swift-BAT refined analysis
  41. GRB 050802.422: Fading of the afterglow and detection of the host
  42. GRB 050803, optical observations
  43. GRB 050803: early Swift XRT analysis results
  44. GRB 050803: TAROT optical limits
  45. GRB050803: Swift-BAT detection of a very long burst
  46. GCN GRB observation 050713A
  47. GRB 050802: Swift/UVOT optical and UV detections
  48. GRB050802 radio non-detection
  49. GRB 050730: OHP optical observations
  50. GRB 050802: Swift/UVOT observations
  51. GRB 050802 : Lulin Optical follow-up observation
  52. GRB 050802: Swift-BAT refined analysis
  53. GRB050801: Optical photometry and decay index
  54. GRB 050802: Swift Gamma-ray Burst
  55. GCN 050801: early Swift XRT analysis results
  56. GRB 050801: Swift-BAT refined analysis
  57. GRB050801: Swift-BAT detection of a burst
  58. GRB 050730: early TAROT optical observations
  59. GRB 050726: PROMPT Rc Observations
  60. Swift/UVOT photometry of GRB050730
  61. GRB 050730, spectra and optical photometry
  62. GRB050730: Refined BAT analysis of the Swift-BAT burst
  63. GRB 050730: Swift XRT afterglow observations
  64. GRB 050730 XMM-Newton observation
  65. GRB 050730: PROMPT VRcIc Observations
  66. GRB050730: Swift-BAT detection of a weak burst
  67. GRB 050709: PROMPT Rc Observations
  68. GRB 050724: Secure Host Redshift from Keck
  69. GRB050726: Swift UVOT observations
  70. GRB 050724: Chandra Observations of the X-ray Afterglow
  71. GRB050713: analysis of the XMM-Newton observation
  72. GRB050709: Second Epoch Chandra Observation
  73. GRB050709: Second Epoch Chandra Observation
  74. GRB 050726: early Swift XRT analysis results
  75. GRB050726: Swift-BAT detection of a weak burst
  76. GRB 050724: Optical Variability in Nearby Galaxy
  77. GRB 050724: J-band observations
  78. GRB 050724: GMOS Imaging and Spectroscopy
  79. GRB 050724: SWIFT XRT refined position
  80. RXTE ASM Detection of GRB050724
  81. GRB050724: Radio Observation
  82. GRB 050724: Optical limit
  83. GRB 050724: Swift/UVOT Upper Limit
  84. GRB050724: Refined analysis of the Swift-BAT possible short burst
  85. GRB 050724: possible host galaxy in DSS
  86. GRB050724: a short-burst detected by Swift
  87. GRB 050721A: Swift-BAT refined analysis
  88. GRB050721A: optical decay
  89. GRB 050721: optical afterglow confirmed
  90. GRB050721A: Swift-BAT detection of a weak burst
  91. GRB 050717: PROMPT RcIc Observations
  92. GRB050714b: Radio Observation
  93. GRB050712: Radio Observations
  94. GRB050713a: Radio Observation
  95. Swift-BAT trigger 146731 is not a real GRB
  96. GRB 050712, Tautenburg optical afterglow observations
  97. Swift-BAT detection of a possible GRB
  98. GRB 050714B: VLT R-band observations
  99. GRB 050717: Additional LCO observations
  100. GRB 050716; J-band observations

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