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.

"N/A_MC170219_R1" does not adhere to advanced search syntax. Please refer to the documentation and try again.
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"

10919 results found.

  1. GRB 020409: Optical Observations
  2. X-ray afterglow of GRB020321
  3. GRB020331: Confirmation of Afterglow Candidate with Magellan
  4. GRB020405: VLT optical observations and V band decay slope
  5. GRB020331 optical observations with RIMOTS
  6. GRB020124 optical observations with RIBOTS/RIMOTS
  7. GRB 020405: Moderate-resolution spectroscopy
  8. GRB020331: Optical Observations of Afterglow Candidate
  9. GRB020405: VLT optical observations
  10. GRB020405: VLT spectroscopy
  11. V band observations of GRB020405
  12. GRB011212: Optical Observations
  13. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  14. Near-Infrared Observations of GRB020322 at TIRGO
  15. GRB 020322: Optical Sources and Improved Astrometry
  16. GRB 020322: Optical candidate
  17. XMM-Newton observation of GRB020322
  18. GRB 020317 : KISO Optical Observations
  19. GRB020317 (=H1959): Localization by HETE of a Low Fluence GRB
  20. GRB011130 (XRF011130) Second Epoch Chandra Observations
  21. GRB020305: Subaru Optical Observations
  22. IPN triangulation of GRB020305 (HETE 1939)
  23. GRB020305 (=H1939): Localization of a GRB by HETE
  24. IPN/HETE Detection of Bursts from SGR1900+14
  25. IPN Upper Limits to a GRB Associated With SN2002ap
  26. IPN triangulation of GRB020127 (=H1902)
  27. GRB020127(=H1902): Localization of a Double-Peaked GRB by HETE
  28. IPN triangulation of GRB020124 (HETE 1896)
  29. GRB020124(=H1896): Localization of a Long GRB by HETE
  30. GRB011212, Optical Observations
  31. Optical polarization observations for GRB011211
  32. Color indices of the afterglow of GRB011211
  33. GRB011212: Optical observations at Gunma
  34. GRB 011130: Optical Observations of X-ray and Radio Sources
  35. GRB 011211: TNG Spectroscopic Observations
  36. GRB011212 (=H10001): An X-Ray Rich GRB Detected by HETE
  37. XMM-Newton observation of GRB011211
  38. GRB011130 (=XRF011130): Further analysis of Chandra Target of
  39. GRB 011130: Optical Observations of Chandra Sources
  40. GRB 011130: Optical Observations of Chandra sources
  41. GRB011130 (XRF011130) Chandra Observations
  42. GRB011130 (=XRF011130): Scheduled Target of Opportunity
  43. GRB011130 (=XRF011130): Second Revised Localization by HETE
  44. GRB 011130 I-band Observation
  45. GRB011130 (=XRF011130): Revised Localization of an X-ray
  46. GRB 011121
  47. GRB011130 (=H1864): An X-Ray Rich GRB Detected by HETE
  48. GRB 011121: NIR observations, host galaxy?
  49. GRB 011030: TNG K-band observation
  50. XRF011030: J and K band observations
  51. GRB 011030: K-band observations
  52. GRB 011030 I-band Observation
  53. GRB011019: Subaru Optical Observations
  54. GRB 011030 I-band Observations
  55. GRB 011030 K-band Observations
  56. GRB010921, optical observations
  57. GRB011019: A Faint, X-ray Rich GRB localized by HETE
  58. GRB010928(=H1770): Localization of a Long GRB by HETE
  59. GRB010923(=H1764): A Short Duration GRB Detected by HETE
  60. GRB 010921 DPOSS Images Available
  61. IPN triangulation of GRB010921 (=H1761)
  62. H1761: A Bright GRB Detected by HETE
  63. Probable SGR or Short Duration GRB Detected by HETE
  64. BeppoSAX/GRBM detection of GRB010728
  65. GRB 010222 - WHT BVRI images
  66. GRB010629: Optical Observations
  67. SGR1900+14: High Fluence Burst Localized by HETE
  68. GRB010629: A Burst Localized by HETE
  69. SGR1900+14: Second Burst Localized by HETE
  70. SGR1900+14: A Burst Localized by HETE
  71. SGR1806-20: A Second, Intense Burst Localized by HETE
  72. SGR1806-20: Localization by HETE
  73. GRB010214, optical observations
  74. GRB Observation Report
  75. REVISED LOCATION OF GRB010326A
  76. GRB010326B: Localization by HETE (2nd GRB for this date)
  77. GRB010326: Refined Localization by HETE
  78. GRB010326: Localization by HETE
  79. Optical Observations of GRB 010324
  80. GRB 010222 - HEGRA GeV/TeV Observations
  81. GRB010222, possible increase of optical decay slope
  82. GRB 010220: Near-IR Observations
  83. GRB 010222: Near-IR Observations
  84. GRB010214, candidate optical afterglow
  85. GRB010214, optical observations
  86. J-Band Observation of GRB 010214.
  87. Possible InfraRed Transient of GRB 010214.
  88. GRB010214 Optical Observation
  89. GRB010213 detected by HETE
  90. GRB010126, TNG R-band observations
  91. Optical Observations of GRB 001018 at Keck
  92. H band observation of GRB 001212
  93. GRB 001109: deep JHK upper limits
  94. CORRECTION to XMM-Newton observation of GRB001025
  95. XMM-Newton observation of GRB001025
  96. V,R,I band observations of GRB000926
  97. The Likely Optical/Infrared Afterglow of GRB 001011
  98. Public availability of BeppoSAX data of GRB000926
  99. GRB000926: X-ray afterglow by BeppoSAX: revised fluxes (fwd)
  100. GRB 000926, Optical Decay

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