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"

28871 results found.

  1. Distribution of INTEGRAL SPI-ACS triggers
  2. GRB030115: TAROT optical observations
  3. GRB 030115, no optical candidate
  4. IPN triangulation of GRB030101 (two large error boxes)
  5. GRB021211: Measurement of Early Time Afterglow
  6. GRB021204: Kiso Observations
  7. GRB 021211, R- and I-band observations
  8. GRB021211, OT at 108 s
  9. HETE 2493: Optical observations
  10. HETE 2493: Optical candidate
  11. GRB 021204: Optical Observations at RIKEN
  12. GRB 021201: BOOTES simultaneous optical observations
  13. GRB 021112: RAPTOR Observations
  14. GRB021104: Optical Observations
  15. SGR1900+14 activity, November 2-4, 2002
  16. GRB021104: possible optical afterglow
  17. GRB 021016, optical observations
  18. GRB 021004: VRI observations at TNG: possible break
  19. GRB 021008, optical observations
  20. IPN triangulation of GRB021014 (large error box)
  21. GRB 021004: Additional V-band Polarimetric Observations
  22. GRB 021004: V-band Polarimetric Observations
  23. GRB 021004: Optical observations at RIKEN
  24. GRB 021004, SPM optical observations
  25. GRB021004: optical observations at Nyrola
  26. GRB021004: Optical Afterglow
  27. GRB 020903: Optical observations at RIKEN
  28. XRF 020903: Supernova
  29. IPN triangulation of GRB020914
  30. GRB020903(=H2314): An X-Ray Flash Localized by HETE
  31. INTEGRAL GRBs added to GCN
  32. GRB020812: optical observation
  33. Second epoch K band imaging of GRB 020819
  34. K band observation of GRB 020819
  35. HETE 2275: Optical observations
  36. Polarimetry of GRB020813: evidence for variability
  37. GRB020812: optical observations
  38. GRB020813: Early Time Magnitude
  39. GRB020813, optical observations
  40. Early Time Limits for GRB020813
  41. GRB 020813 Afterglow Observations; Possible break
  42. GRB 020813 multiband optical observations
  43. GRB020813: optical afterglow
  44. GRB020813: Fading of Candidate OT
  45. GRB020813: Candidate Optical Afterglow
  46. GRB 020812 optical observation
  47. GRB020801, optical afterglow candidate
  48. GRB020625 (=H2081): A Long Burst Localized by HETE
  49. HETE #2081: Optical observations
  50. GRB 020531, simultaneous optical observations
  51. GRB020321 : Optical observations.
  52. GRB 020410, optical observations
  53. GRB 020331: Candidate Optical Afterglow
  54. GRB 020322: BeppoSAX observations of the X-ray afterglow
  55. SN 2002ap - peak brightness date (SN/GRB?)
  56. GRB020321: a faint BeppoSAX detection
  57. GRB020317, optical observations
  58. GRB020305, optical observations
  59. GRB020124, optical observations
  60. HETE 1896: Optical observations
  61. GRB011130 (=XRF011130), Optical Observations
  62. GRB011130 (=H1864): An X-Ray Rich GRB Detected by HETE
  63. GRB 011030: K-band observations
  64. The X-ray Flash 011030 ('GRB 011030')
  65. GRB 011019 optical observation
  66. Optical observation of SGR 1806-20 at the 6-m SAO telescope
  67. GRB 010921: The afterglow of HETE #1761
  68. Optical Observations of the field of HETE trigger #1793/GRB 011012?
  69. Optical Observations of the field of HETE trigger #1793/GRB 011012?
  70. GRB010921 Optical Observations
  71. HETE Trigger #1760 (GRB 010920B?): new optical source = asteroid
  72. HETE Trigger #1760 (GRB 010920B?): a new optical source
  73. HETE Trigger #1759 (GRB 010920?) optical observations
  74. BeppoSAX/GRBM detection of GRB 010801
  75. GCN and HETE status
  76. Dramatic Increase in the Rate of X-ray Bursts Reported by HETE
  77. GRB 010629 Optical Observations
  78. IPN triangulation of GRB010613
  79. IPN triangulation of GRB010612
  80. GRB010518: a faint BeppoSAX detection
  81. GRB010324: BeppoSAX/GRBM data
  82. GRB 010214: X-Ray afterglow
  83. GRB010213, optical observations
  84. GRB010126: CONCAM crude optical limits during GRB
  85. HETE positions added to GCN
  86. CONCAM null result on GRB001005
  87. CONCAM crude optical limits before and after GRB000926
  88. GRB000607, optical observations
  89. GRB 000615: NIR observations
  90. IPN triangulation of GRB000519
  91. RXTE/ASM and IPN localization of GRB 000508B
  92. BeppoSAX GRB000424
  93. BATSE observations of FXT/GRB 000416 = 1SAXJ1715.0-7134
  94. GRB000408, lotis optical observations
  95. GRB 000313 - optical transient in the BATSE error box
  96. GRB 000214 ``Valentine's Day Burst'': BeppoSAX NFI Observation
  97. BATSE GRB trigger criterion changed
  98. GRB000210 X-ray afterglow
  99. GRB 000210: BATSE Observations
  100. GRB000201 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