Skip to main content
Updates to LVK & CHIME Notices, Schema v7.2.3! 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').
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"

28048 results found.

  1. GRB 050319: Swift-BAT refined analysis
  2. GRB050319,optical observation
  3. GRB 050318: Swift/UVOT detection of afterglow emission
  4. RXTE Observations of GRB050318
  5. GRB050223: analysis of the XMM-Newton observation
  6. GRB050316: MASTER before, simultanious and follow up optical
  7. GRB 050306: ROTSE-III early limits
  8. GRB050316: MASTER optical observations
  9. GRB 050315: Swift-BAT further refined analysis
  10. GRB 050315 I-band observations
  11. GRB050315: Radio afterglow
  12. GRB050315: Swift-BAT Refined analysis
  13. Non-detection of GRB050315 in ATCA Radio Observations
  14. GRB 050219b: Gemini/GNIRS near-infrared spectroscopy
  15. GRB 050315: Early Observations with Swift/UVOT
  16. GRB 050306: Radio Observations
  17. GRB050306: 250 GHz upper limit with MAMBO at the IRAM 30m
  18. GRB 050306: optical afterglow
  19. Swift-BAT trigger 107873: No Swift XRT counterpart
  20. GRB 050306: Confirmation of X-ray afterglow
  21. GRB 050306: further TAROT optical data
  22. GRB050309: Early optical limit from P60
  23. Swift-BAT trigger 107873 (GRB050309): possible X-ray counterparts
  24. GRB 050309 : Lulin R-band observation
  25. Swift 107873: P60 Optical Observations
  26. GRB 050306: R-band observations
  27. GRB 050306: REM optical-infrared observations
  28. GRB 050306: Possible X-ray Afterglow Position from the Swift
  29. GRB 050306: TAROT optical observations
  30. GRB 050306,optical observation
  31. Ongoing activity of SGR 1806-20 after the giant flare
  32. GRB050215B: Late-Time Swift UVOT Observations
  33. PROMPT VRcIc Observations of GRB 050223
  34. XRF/GRB 050215B: Radio Observations
  35. XMM-Newton Images of GRB 050223
  36. GRB 050219b: candidate NIR afterglow
  37. Confirmed XRF nature for GRB050215b
  38. GRB050223 XMM-Newton observation
  39. INTEGRAL detection of GRB 050223
  40. GRB050223: ROTSE-III Optical Observations
  41. GRB 050223 Swift/BAT detection of a burst
  42. GRB 050223: Swift XRT Position
  43. HETE-2 Observations of GRB 050215b (=U11570): A Likely X-Ray Flash
  44. GRB050215b: Faulkes North and SDSS limits on UKIRT candidate
  45. GRB 050219a: Optical observations from LCO
  46. GRB 050219b: Optical and near-IR observations from LCO
  47. GRB 050219b: Swift-BAT detection of a burst
  48. GRB 050219b: CORRECTION: Swift XRT Position
  49. GRB 050219b: Swift XRT Position
  50. GRB 050219: Swift-BAT detection of a burst
  51. GRB 050215b: XRT confirmation of IR afterglow candidate
  52. GRB050215b: P60 Optical Observations
  53. GRB 050215b: Swift XRT Source Variability
  54. GRB 050215B: candidate afterglow
  55. GRB 050215b : Lulin follow-up observation
  56. GRB 050215b, BOOTES-2 simultaneous optical observations
  57. GRB050215A: ROTSE-III Optical Observations
  58. GRB050209: TAROT optical observations
  59. GRB 050209(=U11568): Duration and spectrum
  60. GRB050209: REM optical observations
  61. GRB 050209 I-band observation
  62. GRB 050209 Optical observations
  63. GRB050209: P60 Optical Observations
  64. GRB 050128: Radio observations
  65. Further analysis of the short Swift-BAT GRB 050202
  66. GRB 050202: Short burst detected by Swift-BAT
  67. GRB 050128 Optical observation with REM
  68. SGR1806-20: Swift-BAT detection of a large normal burst
  69. GRB 050128: near-infrared observations with REM
  70. GRB050128,optical observations
  71. GRB050128 Swift-BAT observations
  72. GRB 050128: Swift XRT prompt afterglow position
  73. GRB050126: MASTER optical limit for KECK OT
  74. GRB050126: Burst Parameters Measured by BAT
  75. GRB050126: MASTER optical observations
  76. GRB 050124 I-band observation
  77. GRB050124,optical observation
  78. GRB 050124 : Lulin R-band follow-up observation
  79. GRB050124: Updated Swift XRT Position and Fluxes
  80. GRB 050124: Swift XRT Detection of X-ray Afterglow Emission
  81. GRB050124: Refined BAT position, spectral and fluence information
  82. GRB 050123 : I-band follow-up observation
  83. GRB050123,optical observation
  84. GRB 050123: KAIT observations
  85. GRB 041224 and GRB 041226: BOOTES-2 simultaneous observations
  86. GRB050117: Refined XRT position
  87. GRB050117: MASTER optical observations
  88. MASTER:GRB050117 SWIFT
  89. GRB050117: Swift XRT Position
  90. Triangulation of Short Hard GRB050112 (large error box)
  91. SGR 1806-20: Further VLA Observations
  92. SGR1806-20: Swift-BAT observations of two additional bursts
  93. SGR1806: Optical Transient Candidates in SOHO/LASCO Images
  94. Further VLA observations of SGR 1806-20
  95. SGR 1806-20 and extragalactic short-duration GRBs
  96. Further ATCA observations of SGR 1806-20
  97. Fourth Epoch VLA observations of SGR 1806-20
  98. SGR 1806-20: Low frequency GMRT results; submission to GCN circulars
  99. ATCA observations of SGR 1806-20
  100. SGR 1806-20, RHESSI observations of the 041227 giant flare

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