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"

23578 results found.

  1. GRB 020603, R-band observation
  2. Correction to IPN triangulation of GRB020603 (possible short/hard burst)
  3. IPN triangulation of GRB020603 (possible short/hard GRB)
  4. GRB 020531 optical observations with TAROT
  5. Refined IPN error box for GRB020531
  6. GRB020531: optical observations
  7. GRB020531(=H2042): Optical Observations
  8. IPN triangulation of the short, hard GRB020531 (=H2042)
  9. GRB020531(=H2042): Optical Observations
  10. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  11. GRB 020525: Optical Observations
  12. IPN triangulation of GRB020525
  13. HETE Observations of GX354-0 (= MXB1728-34, so-called "Slow
  14. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  15. GRB/XRF 020427, Radio Observations
  16. GRB020405 field photometry at ESO
  17. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  18. GRB 020410, Radio Observations
  19. IPN triangulation of GRB020418
  20. GRB020410: BeppoSAX NFI observations refined analysis
  21. GRB 020409: Optical Observations
  22. Mars Odyssey joins the IPN
  23. IPN triangulation of GRB020413
  24. GRB 020409: No Evidence for an Optical Afterglow
  25. GRB 020409, 2nd epoch optical observations
  26. GRB 020331 Kyoto observation on March 31
  27. GRB 020409 SARA Observations
  28. GRB "020411"
  29. GRB 020410, optical observations
  30. GRB 020409, optical observations
  31. X-ray afterglow of GRB020321
  32. GRB020405: VLT optical observations and V band decay slope
  33. GRB020331 optical observations with RIMOTS
  34. GRB020124 optical observations with RIBOTS/RIMOTS
  35. GRB 020321: Candidate X-ray Counterparts
  36. GRB 020405: Moderate-resolution spectroscopy
  37. GRB020405: VLT optical observations
  38. GRB 020331: Candidate Optical Afterglow
  39. Short RXTE/ASM transient 020406; may be a GRB
  40. Fading Optical Afterglow and Possible Host Galaxy of GRB 020405
  41. V band observations of GRB020405
  42. GRB 020405, U-band observations
  43. IPN localization of GRB020405
  44. GRB011212: Optical Observations
  45. GRB 020331: NIR Observations
  46. GRB020331 NIR observation at KPNO (re-submission)
  47. GRB02033 NIR observation at KPNO
  48. GRB020331 field photometry
  49. GRB 020331, NIR observations
  50. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  51. GRB 020322: BeppoSAX observations of the X-ray afterglow
  52. GRB 020321, Radio Observations
  53. GRB 020321: Optical observations
  54. GRB020317 BVRI field photometry
  55. GRB011211 revised BVRI field photometry
  56. GRB020305 BVRI field photometry
  57. GRB020322 BVRI field photometry
  58. GRB 020322 optical observations
  59. GRB 020322 optical observation
  60. GRB020317 : Near IR Observations from Mt Abu Observatory
  61. GRB020322, optical observations
  62. XMM-Newton observation of GRB020322
  63. GRB020317: optical observations
  64. GRB020321: BeppoSAX/NFI Observations
  65. GRB 020317 : KISO Optical Observations
  66. GRB020317 (=H1959): Localization by HETE of a Low Fluence GRB
  67. GRB 020305: Optical Observations
  68. GRB 020317: Optical observations
  69. GRB020305: Properties of the Candidate Optical Afterglow
  70. GRB011121, possible supernova association
  71. GRB020305: Subaru Optical Observations
  72. GRB 020305: Candidate optical afterglow
  73. GRB020305, optical observations
  74. GRB020305: Optical Observations
  75. IPN triangulation of GRB020305 (HETE 1939)
  76. GRB020305 (=H1939): Localization of a GRB by HETE
  77. GRB 020305: Optical observations
  78. GRB 010921: HST Observations
  79. IPN detection and localization of Cygnus X-1 flares
  80. SGR1900+14 activity
  81. IPN/HETE Detection of Bursts from SGR1900+14
  82. IPN Upper Limits to a GRB Associated With SN2002ap
  83. GRB020127: Palomar and VLA Observations of Possible Counterparts
  84. GRB020127: Comparison of Chandra Epochs and Identification of Possible Counterparts
  85. SN2002ap (SN/GRB?) Echelle spectra
  86. SN2002ap (SN/GRB?) UBVRI Field Photometry
  87. GRB020127: Chandra Observations and Prospective Counterparts
  88. GRB020124, optical observations
  89. GRB 020127, I-band observations starting 3.14-hr after the event
  90. IPN detection of further activity from SGR1806-20
  91. IPN triangulation of GRB020127 (=H1902)
  92. GRB010921 Optical Observations
  93. GRB020127(=H1902): Localization of a Double-Peaked GRB by HETE
  94. GRB020124: Optical observations
  95. GRB 020124 Optical Observations
  96. IPN triangulation of GRB020124 (HETE 1896)
  97. IPN observations of SGR1806-20
  98. GRB 020124: Optical afterglow
  99. GRB020124(=H1896): Localization of a Long GRB by HETE
  100. GRB optical counterpart candidate in GCN 1217 is M dwarf

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