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"

28231 results found.

  1. GRB 050306: optical afterglow
  2. Swift-BAT trigger 107873: No Swift XRT counterpart
  3. GRB 050306: Confirmation of X-ray afterglow
  4. GRB 050306: further TAROT optical data
  5. GRB050309: Early optical limit from P60
  6. Swift-BAT trigger 107873 (GRB050309): possible X-ray counterparts
  7. GRB 050309 : Lulin R-band observation
  8. Swift 107873: P60 Optical Observations
  9. GRB 050306: R-band observations
  10. GRB 050306: REM optical-infrared observations
  11. GRB 050306: Possible X-ray Afterglow Position from the Swift
  12. GRB 050306: TAROT optical observations
  13. GRB 050306,optical observation
  14. Ongoing activity of SGR 1806-20 after the giant flare
  15. GRB050215B: Late-Time Swift UVOT Observations
  16. PROMPT VRcIc Observations of GRB 050223
  17. XRF/GRB 050215B: Radio Observations
  18. XMM-Newton Images of GRB 050223
  19. GRB 050219b: candidate NIR afterglow
  20. Confirmed XRF nature for GRB050215b
  21. GRB050223 XMM-Newton observation
  22. INTEGRAL detection of GRB 050223
  23. GRB050223: ROTSE-III Optical Observations
  24. GRB 050223 Swift/BAT detection of a burst
  25. GRB 050223: Swift XRT Position
  26. HETE-2 Observations of GRB 050215b (=U11570): A Likely X-Ray Flash
  27. GRB050215b: Faulkes North and SDSS limits on UKIRT candidate
  28. GRB 050219a: Optical observations from LCO
  29. GRB 050219b: Optical and near-IR observations from LCO
  30. GRB 050219b: Swift-BAT detection of a burst
  31. GRB 050219b: CORRECTION: Swift XRT Position
  32. GRB 050219b: Swift XRT Position
  33. GRB 050219: Swift-BAT detection of a burst
  34. GRB 050215b: XRT confirmation of IR afterglow candidate
  35. GRB050215b: P60 Optical Observations
  36. GRB 050215b: Swift XRT Source Variability
  37. GRB 050215B: candidate afterglow
  38. GRB 050215b : Lulin follow-up observation
  39. GRB 050215b, BOOTES-2 simultaneous optical observations
  40. GRB050215A: ROTSE-III Optical Observations
  41. GRB050209: TAROT optical observations
  42. GRB 050209(=U11568): Duration and spectrum
  43. GRB050209: REM optical observations
  44. GRB 050209 I-band observation
  45. GRB 050209 Optical observations
  46. GRB050209: P60 Optical Observations
  47. GRB 050128: Radio observations
  48. Further analysis of the short Swift-BAT GRB 050202
  49. GRB 050202: Short burst detected by Swift-BAT
  50. GRB 050128 Optical observation with REM
  51. SGR1806-20: Swift-BAT detection of a large normal burst
  52. GRB 050128: near-infrared observations with REM
  53. GRB050128,optical observations
  54. GRB050128 Swift-BAT observations
  55. GRB 050128: Swift XRT prompt afterglow position
  56. GRB050126: MASTER optical limit for KECK OT
  57. GRB050126: Burst Parameters Measured by BAT
  58. GRB050126: MASTER optical observations
  59. GRB 050124 I-band observation
  60. GRB050124,optical observation
  61. GRB 050124 : Lulin R-band follow-up observation
  62. GRB050124: Updated Swift XRT Position and Fluxes
  63. GRB 050124: Swift XRT Detection of X-ray Afterglow Emission
  64. GRB050124: Refined BAT position, spectral and fluence information
  65. GRB 050123 : I-band follow-up observation
  66. GRB050123,optical observation
  67. GRB 050123: KAIT observations
  68. GRB 041224 and GRB 041226: BOOTES-2 simultaneous observations
  69. GRB050117: Refined XRT position
  70. GRB050117: MASTER optical observations
  71. MASTER:GRB050117 SWIFT
  72. GRB050117: Swift XRT Position
  73. Triangulation of Short Hard GRB050112 (large error box)
  74. SGR 1806-20: Further VLA Observations
  75. SGR1806-20: Swift-BAT observations of two additional bursts
  76. SGR1806: Optical Transient Candidates in SOHO/LASCO Images
  77. Further VLA observations of SGR 1806-20
  78. SGR 1806-20 and extragalactic short-duration GRBs
  79. Further ATCA observations of SGR 1806-20
  80. Fourth Epoch VLA observations of SGR 1806-20
  81. SGR 1806-20: Low frequency GMRT results; submission to GCN circulars
  82. ATCA observations of SGR 1806-20
  83. SGR 1806-20, RHESSI observations of the 041227 giant flare
  84. Third epoch observations of SGR 1806-20 with VLA
  85. Second Epoch VLA observations of SGR 1806-20
  86. Second-epoch VLA observations of SGR 1806-20
  87. SGR1806 VLA Observations
  88. SGR1806-20: RXTE-PCA observation of the 041227 super-flare
  89. GRB 041217: Optical observations
  90. GRB041228: Swift-BAT detection of a burst
  91. GRB041219; RXTE ASM Observations
  92. NIR Observations of GRB 041219
  93. GRB041226: Swift-BAT detection of a burst
  94. GRB041223: decay of the afterglow
  95. GRB 041224: near-infrared observations with REM
  96. GRB 041223 Fluence measured by Swift-BAT
  97. GRB041223: optical and NIR observations with REM
  98. Swift-BAT Time History of GRB041219
  99. GRB 041219: TAROT optical observations
  100. GRB 041218: TAROT optical 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