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"

38578 results found.

  1. INTEGRAL detection of GRB 050223
  2. GRB 050223 : Planned XMM-Newton observation
  3. GRB050223: No Swift UVOT Detection of Afterglow Emission
  4. GRB050223: ROTSE-III Optical Observations
  5. GRB 050223 Swift/BAT detection of a burst
  6. GRB 050223: Swift XRT Position
  7. HETE-2 Observations of GRB 050215b (=U11570): A Likely X-Ray Flash
  8. GRB050219b: CORRECTION to time of UVOT observations
  9. GRB050215b: Faulkes North and SDSS limits on UKIRT candidate
  10. GRB050219b: No Swift UVOT Detection of Afterglow Emission
  11. GRB 050219b: CORRECTION to refined XRT position
  12. GRB 050219a: Optical observations from LCO
  13. GRB 050219b: Optical and near-IR observations from LCO
  14. GRB050219b: No Swift UVOT Detection of Afterglow Emission
  15. GRB 050219b: Refined XRT position
  16. GRB 050219b: Swift-BAT detection of a burst
  17. GRB 050219b: CORRECTION: Swift XRT Position
  18. GRB 050219b: Swift XRT Position
  19. GRB 050219a, optical observations
  20. GRB 050219a: Refined XRT position
  21. GRB050219a: No Swift UVOT Detection of Afterglow Emission
  22. GRB 050219: Swift-BAT detection of a burst
  23. GRB050215b: Swift UVOT Detection of Afterglow Emission
  24. GRB 050219: Prompt X-ray position
  25. GRB 050215B: Radio Observations
  26. GRB 050215b: XRT confirmation of IR afterglow candidate
  27. GRB050215b: P60 Optical Observations
  28. GRB 050215b: Swift XRT Source Variability
  29. GRB 050215B: candidate afterglow
  30. GRB 050215b : Lulin follow-up observation
  31. GRB 050215B: UKIRT K-band imaging
  32. GRB 050215b: Swift XRT Observations
  33. GRB050215b: No Swift UVOT Detection of Afterglow Emission
  34. GRB050215a: No Swift UVOT Detection of Afterglow Emission
  35. Swift-BAT detects two bursts: GRB050215a and GRB050215b
  36. GRB 050215b, BOOTES-1B optical limit
  37. GRB050215B: ROTSE-III optical observations
  38. GRB050215A: ROTSE-III Optical Observations
  39. GRB050209: TAROT optical observations
  40. GRB 050209(=U11568): Duration and spectrum
  41. short/hard GRB 050202, optical observations
  42. GRB050209: REM optical observations
  43. GRB 050209 I-band observation
  44. GRB 050209 Optical observations
  45. GRB050209: P60 Optical Observations
  46. GRB050209 (=U11568): A Long GRB Detected by HETE
  47. GRB 050128: Radio observations
  48. Further analysis of the short Swift-BAT GRB 050202
  49. GRB 050202: Second epoch radio observations
  50. GRB050202: Radio Observations
  51. GRB 050202: Optical observations with LCO40
  52. GRB 050202: Short burst detected by Swift-BAT
  53. GRB 050128 Optical observation with REM
  54. GRB 050129: a weak long GRB detected with INTEGRAL
  55. SGR1806-20: Swift-BAT detection of a large normal burst
  56. GRB050128: Faulkes Telescope South observations
  57. GRB 050124: Radio Observations
  58. GRB 050128: near-infrared observations with REM
  59. GRB050128,optical observations
  60. GRB 050126: A NIR afterglow candidate in the revised XRT error circle
  61. GRB050126: Updated Swift XRT Position
  62. SGR 1806-20: GMRT results at 240 MHz band.
  63. SGR 1806-20: low frequency GMRT results of 2005 Jan 16.
  64. GRB 050126: Radio Observations
  65. GRB050128 Swift-BAT observations
  66. GRB 050128: Swift XRT prompt afterglow position
  67. HETE #3667: P60 Observations
  68. GRB 050124: K-band afterglow observations
  69. GRB050126: MASTER optical limit for KECK OT
  70. GRB050126: Burst Parameters Measured by BAT
  71. GRB050126: MASTER optical observations
  72. GRB 050126: Detection of NIR afterglow with Keck/NIRC
  73. GRB 050126: Prompt XRT detection and localization
  74. GRB 050124: NIR afterglow confirmed with Keck/NIRC
  75. GRB050124: No Swift UVOT Detection of Afterglow Emission
  76. GRB 050124, SMARTS optical/IR observations
  77. GRB 050117a: Radio Observations
  78. GRB 050124 I-band observation
  79. GRB 050124: NIR Candidates from Keck/NIRC
  80. GRB050124,optical observation
  81. GRB 050124 : Lulin R-band follow-up observation
  82. GRB050124: Updated Swift XRT Position and Fluxes
  83. GRB 050124: Swift XRT Detection of X-ray Afterglow Emission
  84. GRB050124: Refined BAT position, spectral and fluence information
  85. GRB050124: Swift-BAT position of a double-peaked burst
  86. GRB 050123 : I-band follow-up observation
  87. GRB050123: optical limit 1.8h before GRB
  88. GRB050123,optical observation
  89. GRB 050123: KAIT observations
  90. GRB050123: P60 Observations
  91. GRB 050123(=H3666): A GRB Localized in Real Time by HETE
  92. Unusual optical transient (GRB ???)
  93. GRB050117a: Radio Observations
  94. GRB050117a: Refined analysis
  95. GRB050117: Palomar WIRC Ks-band observations
  96. GRB050117b: Swift-BAT detection of a weak burst
  97. GRB 050117, I-band observations
  98. GRB050117: Refined XRT position
  99. GRB050117: MASTER optical observations
  100. MASTER:GRB050117 SWIFT

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