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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"

2974 results found.

  1. GRB 030329, the review of the sky area in plate archive (1950-1998)
  2. GRB030329: optical observations at Tokyo Tech
  3. GRB030329 - near contemporaneous optical limits from CONCAM
  4. IPN triangulation of GRB030325 (single small error box)
  5. IPN triangulation of GRB030325 (two small error boxes)
  6. IPN triangulation of GRB030320 (small error box)
  7. GRB 030227: Optical limit at RIKEN
  8. GRB 030228, optical observations
  9. GRB 030227: fading of candidate optical afterglow 'S1-A'
  10. GRB 030227, possible optical counterpart of XMM-Newton source
  11. GRB030227 - faint tentative OT candidate
  12. GRB 030227: Kyoto optical observation
  13. IPN triangulation of GRB030119 (two large error boxes)
  14. IPN triangulation of GRB030117 (two large error boxes)
  15. IPN triangulation of GRB021219 - CORRECTION
  16. GRB021219: a long GRB localized by INTEGRAL
  17. IPN triangulation of GRB021206 (small error box)
  18. GRB021104: Optical Observations
  19. IPN triangulation of GRB021020 (smaller error box)
  20. GRB021016(=H2397): A Long GRB Localized by HETE
  21. IPN triangulation of GRB021008 (two small error boxes)
  22. GRB 021004: Optical measurement at OHP
  23. GRB 021004: Optical Photometry at 2.5 Days
  24. GRB021004: Update Bisei photometric data
  25. IPN triangulation of GRB020914
  26. Confirmation of IPN error box for GRB020910
  27. IPN triangulation of GRB020910
  28. Single IPN error box for GRB020904
  29. IPN triangulation of GRB020904
  30. GRB 020812: optical observation at Kyoto University
  31. GRB020819(=H2275): A Long Burst Localized by the HETE WXM and SXC
  32. GRB020812: optical observations
  33. IPN triangulation of GRB020708
  34. IPN triangulation of GRB020708
  35. GRB 020705: Optical observations
  36. GRB 020603, R-band observation
  37. GRB020531: optical observations
  38. GRB 020409: Optical Observations
  39. GRB020124 optical observations with RIBOTS/RIMOTS
  40. GRB 020321: Candidate X-ray Counterparts
  41. GRB011212: Optical Observations
  42. GRB020127(=H1902): Localization of a Double-Peaked GRB by HETE
  43. GRB011212: Optical observations at Gunma
  44. GRB011130 (=XRF011130): Further analysis of Chandra Target of
  45. IPN triangulation of GRB011121
  46. GRB 010629 Optical Observations
  47. GRB 010222
  48. IPN/RXTE TRIANGULATION OF GRB010126
  49. GRB010126, TNG R-band observations
  50. GRB010126 optical observations
  51. IPN TRIANGULATION OF GRB010126
  52. IPN triangulation of GRB001219
  53. IPN triangulation of GRB000911
  54. IPN localization of GRB000820
  55. IPN localization of GRB000811
  56. GRB000607, A SHORT, HARD BURST
  57. GRB000424, optical observations
  58. IPN localization of GRB991226
  59. GRB 991106, LOTIS Optical Observations
  60. IPN/NFI error box for GRB991014
  61. IPN error box for GRB990915 (=BATSE 7766)
  62. GRB990806 UBVRIJHK observations
  63. GRB990704, optical observations
  64. IPN error box for GRB990527
  65. IPN localization for GRB990506
  66. GRB 990316, Optical observations
  67. GRB990308, Possible new SGR~0209+70
  68. GRB990123, early optical counterpart detection
  69. GRB 981226 Optical Observations
  70. GRB 981226 optical observations
  71. GRB980326 IPN annulus
  72. Near-IR follow-up on GRB 971227
  73. Optical Observations of the GRB 971227 field
  74. GRB971227: Further CAHA R-band images

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