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"

38573 results found.

  1. GRB 050223: Swift XRT Position
  2. HETE-2 Observations of GRB 050215b (=U11570): A Likely X-Ray Flash
  3. GRB050219b: CORRECTION to time of UVOT observations
  4. GRB050215b: Faulkes North and SDSS limits on UKIRT candidate
  5. GRB050219b: No Swift UVOT Detection of Afterglow Emission
  6. GRB 050219b: CORRECTION to refined XRT position
  7. GRB 050219a: Optical observations from LCO
  8. GRB 050219b: Optical and near-IR observations from LCO
  9. GRB050219b: No Swift UVOT Detection of Afterglow Emission
  10. GRB 050219b: Refined XRT position
  11. GRB 050219b: Swift-BAT detection of a burst
  12. GRB 050219b: CORRECTION: Swift XRT Position
  13. GRB 050219b: Swift XRT Position
  14. GRB 050219a, optical observations
  15. GRB 050219a: Refined XRT position
  16. GRB050219a: No Swift UVOT Detection of Afterglow Emission
  17. GRB 050219: Swift-BAT detection of a burst
  18. GRB050215b: Swift UVOT Detection of Afterglow Emission
  19. GRB 050219: Prompt X-ray position
  20. GRB 050215B: Radio Observations
  21. GRB 050215b: XRT confirmation of IR afterglow candidate
  22. GRB050215b: P60 Optical Observations
  23. GRB 050215b: Swift XRT Source Variability
  24. GRB 050215B: candidate afterglow
  25. GRB 050215b : Lulin follow-up observation
  26. GRB 050215B: UKIRT K-band imaging
  27. GRB 050215b: Swift XRT Observations
  28. GRB050215b: No Swift UVOT Detection of Afterglow Emission
  29. GRB050215a: No Swift UVOT Detection of Afterglow Emission
  30. Swift-BAT detects two bursts: GRB050215a and GRB050215b
  31. GRB 050215b, BOOTES-1B optical limit
  32. GRB050215B: ROTSE-III optical observations
  33. GRB050215A: ROTSE-III Optical Observations
  34. GRB050209: TAROT optical observations
  35. GRB 050209(=U11568): Duration and spectrum
  36. short/hard GRB 050202, optical observations
  37. GRB050209: REM optical observations
  38. GRB 050209 I-band observation
  39. GRB 050209 Optical observations
  40. GRB050209: P60 Optical Observations
  41. GRB050209 (=U11568): A Long GRB Detected by HETE
  42. GRB 050128: Radio observations
  43. Further analysis of the short Swift-BAT GRB 050202
  44. GRB 050202: Second epoch radio observations
  45. GRB050202: Radio Observations
  46. GRB 050202: Optical observations with LCO40
  47. GRB 050202: Short burst detected by Swift-BAT
  48. GRB 050128 Optical observation with REM
  49. GRB 050129: a weak long GRB detected with INTEGRAL
  50. SGR1806-20: Swift-BAT detection of a large normal burst
  51. GRB050128: Faulkes Telescope South observations
  52. GRB 050124: Radio Observations
  53. GRB 050128: near-infrared observations with REM
  54. GRB050128,optical observations
  55. GRB 050126: A NIR afterglow candidate in the revised XRT error circle
  56. GRB050126: Updated Swift XRT Position
  57. SGR 1806-20: GMRT results at 240 MHz band.
  58. SGR 1806-20: low frequency GMRT results of 2005 Jan 16.
  59. GRB 050126: Radio Observations
  60. GRB050128 Swift-BAT observations
  61. GRB 050128: Swift XRT prompt afterglow position
  62. HETE #3667: P60 Observations
  63. GRB 050124: K-band afterglow observations
  64. GRB050126: MASTER optical limit for KECK OT
  65. GRB050126: Burst Parameters Measured by BAT
  66. GRB050126: MASTER optical observations
  67. GRB 050126: Detection of NIR afterglow with Keck/NIRC
  68. GRB 050126: Prompt XRT detection and localization
  69. GRB 050124: NIR afterglow confirmed with Keck/NIRC
  70. GRB050124: No Swift UVOT Detection of Afterglow Emission
  71. GRB 050124, SMARTS optical/IR observations
  72. GRB 050117a: Radio Observations
  73. GRB 050124 I-band observation
  74. GRB 050124: NIR Candidates from Keck/NIRC
  75. GRB050124,optical observation
  76. GRB 050124 : Lulin R-band follow-up observation
  77. GRB050124: Updated Swift XRT Position and Fluxes
  78. GRB 050124: Swift XRT Detection of X-ray Afterglow Emission
  79. GRB050124: Refined BAT position, spectral and fluence information
  80. GRB050124: Swift-BAT position of a double-peaked burst
  81. GRB 050123 : I-band follow-up observation
  82. GRB050123: optical limit 1.8h before GRB
  83. GRB050123,optical observation
  84. GRB 050123: KAIT observations
  85. GRB050123: P60 Observations
  86. GRB 050123(=H3666): A GRB Localized in Real Time by HETE
  87. Unusual optical transient (GRB ???)
  88. GRB050117a: Radio Observations
  89. GRB050117a: Refined analysis
  90. GRB050117: Palomar WIRC Ks-band observations
  91. GRB050117b: Swift-BAT detection of a weak burst
  92. GRB 050117, I-band observations
  93. GRB050117: Refined XRT position
  94. GRB050117: MASTER optical observations
  95. MASTER:GRB050117 SWIFT
  96. GRB050117: Swift-BAT detection of a long multi-peaked burst
  97. GRB050117: Swift XRT Position
  98. Triangulation of Short Hard GRB050112 (large error box)
  99. SGR 1806-20: Further VLA Observations
  100. SGR 1806-20: Further low frequency GMRT results

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