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"

3797 results found.

  1. GRB040924: Optical afterglow properties
  2. TAROT Observations of GRB 040916 (HETE #3558)
  3. GRB040912(=H3557): Observations with the Chandra X-ray Observatory
  4. GRB040912 : Kiso Optical follow-up observation
  5. GRB 040812: Second epoch CXO Observations
  6. CXO observation of GRB 040812
  7. GRB040706:observation at University of Miyazaki
  8. IPN Summary of SGR1806-20 Activity in 2004
  9. Summary of recent bursts from SGR 1806-20 detected by INTEGRAL
  10. GRB 040319 (=H3128): An X-Ray-Rich GRB Localized by the HETE-2 WXM and SXC
  11. Lulin optical follow-up observations of GRB031026
  12. XRF 030824: additional observations at CFHT
  13. IPN triangulation of GRB031007 (two large error boxes)
  14. IPN triangulation of GRB030922B (large error box)
  15. XRF030823 (=H2818): An X-Ray Flash Localized by the HETE WXM and SXC
  16. IPN triangulation of GRB030919 (large error box)
  17. GRB030913: AAVSO optical observations
  18. GRB 030824: Candidate Afterglow (or Variable/Flare Star?)
  19. IPN triangulation of GRB030714 (two large error boxes)
  20. IPN triangulation of GRB030626 (two large error boxes)
  21. GRB030429, refiend optical brightness
  22. GRB 030329: all-sky CCD images by K. Shiokawa immediately after the burst
  23. GRB030429: Optical Observations
  24. GRB 030329, the review of the sky area in plate archive (1950-1998)
  25. GRB030329: optical observations at Tokyo Tech
  26. GRB030329 - near contemporaneous optical limits from CONCAM
  27. IPN triangulation of GRB030325 (single small error box)
  28. IPN triangulation of GRB030325 (two small error boxes)
  29. IPN triangulation of GRB030320 (small error box)
  30. GRB 030227: Optical limit at RIKEN
  31. GRB 030228, optical observations
  32. GRB 030227: fading of candidate optical afterglow 'S1-A'
  33. GRB 030227, possible optical counterpart of XMM-Newton source
  34. GRB030227 - faint tentative OT candidate
  35. GRB 030227: Kyoto optical observation
  36. IPN triangulation of GRB030119 (two large error boxes)
  37. IPN triangulation of GRB030117 (two large error boxes)
  38. IPN triangulation of GRB021219 - CORRECTION
  39. GRB021219: a long GRB localized by INTEGRAL
  40. IPN triangulation of GRB021206 (small error box)
  41. GRB021104: Optical Observations
  42. IPN triangulation of GRB021020 (smaller error box)
  43. GRB021016(=H2397): A Long GRB Localized by HETE
  44. IPN triangulation of GRB021008 (two small error boxes)
  45. GRB 021004: Optical measurement at OHP
  46. GRB 021004: Optical Photometry at 2.5 Days
  47. GRB021004: Update Bisei photometric data
  48. IPN triangulation of GRB020914
  49. Confirmation of IPN error box for GRB020910
  50. IPN triangulation of GRB020910
  51. Single IPN error box for GRB020904
  52. IPN triangulation of GRB020904
  53. GRB 020812: optical observation at Kyoto University
  54. GRB020819(=H2275): A Long Burst Localized by the HETE WXM and SXC
  55. GRB020812: optical observations
  56. IPN triangulation of GRB020708
  57. IPN triangulation of GRB020708
  58. GRB 020705: Optical observations
  59. GRB 020603, R-band observation
  60. GRB020531: optical observations
  61. GRB 020409: Optical Observations
  62. GRB020124 optical observations with RIBOTS/RIMOTS
  63. GRB 020321: Candidate X-ray Counterparts
  64. GRB011212: Optical Observations
  65. GRB020127(=H1902): Localization of a Double-Peaked GRB by HETE
  66. GRB011212: Optical observations at Gunma
  67. GRB011130 (=XRF011130): Further analysis of Chandra Target of
  68. IPN triangulation of GRB011121
  69. GRB 010629 Optical Observations
  70. GRB 010222
  71. IPN/RXTE TRIANGULATION OF GRB010126
  72. GRB010126, TNG R-band observations
  73. GRB010126 optical observations
  74. IPN TRIANGULATION OF GRB010126
  75. IPN triangulation of GRB001219
  76. IPN triangulation of GRB000911
  77. IPN localization of GRB000820
  78. IPN localization of GRB000811
  79. GRB000607, A SHORT, HARD BURST
  80. GRB000424, optical observations
  81. IPN localization of GRB991226
  82. GRB 991106, LOTIS Optical Observations
  83. IPN/NFI error box for GRB991014
  84. IPN error box for GRB990915 (=BATSE 7766)
  85. GRB990806 UBVRIJHK observations
  86. GRB990704, optical observations
  87. IPN error box for GRB990527
  88. IPN localization for GRB990506
  89. GRB 990316, Optical observations
  90. GRB990308, Possible new SGR~0209+70
  91. GRB990123, early optical counterpart detection
  92. GRB 981226 Optical Observations
  93. GRB 981226 optical observations
  94. GRB980326 IPN annulus
  95. Near-IR follow-up on GRB 971227
  96. Optical Observations of the GRB 971227 field
  97. GRB971227: Further CAHA R-band images

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