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"

16161 results found.

  1. GRB020813, UBVRI field calibration
  2. GRB 020813: addendum to GCN 1498
  3. GRB020813: optical observations at Bisei
  4. GRB020813: V-band decay slope
  5. Polarimetry of GRB020813: evidence for variability
  6. GRB020812: optical observations
  7. GRB020813: High-Resolution Optical Observations
  8. GRB020813(=H2262): Revised Localization with HETE SXC
  9. GRB 020812: optical observation at Bisei
  10. GRB020813: optical observations; possible host galaxy
  11. GRB 020813, radio detection
  12. GRB 020812 : optical afterglow candidate
  13. GRB020813, optical observations
  14. GRB020812: optical observations
  15. GRB 020813 : KISO multiband optical observations
  16. GRB020813, optical observations
  17. IPN triangulation of GRB020813
  18. Early Time Limits for GRB020813
  19. GRB 020813 multiband optical observations
  20. GRB020813: optical afterglow
  21. GRB020813(=H2262): A Long, Bright Burst Localized by HETE in Near-Real Time
  22. GRB020813: Candidate Optical Afterglow
  23. GRB 020812 optical observation
  24. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  25. GRB 020715, optical observations
  26. GRB 020714, optical observations
  27. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  28. GRB020801, optical afterglow candidate
  29. GRB020331: Late-time Optical Light Curve (re-submission)
  30. GRB020331: Late-time Optical Light Curve
  31. GRB 020410: Discovery of Probable OT by HST
  32. GRB 020124, HST observations of the fading afterglow
  33. GRB 020705: Optical observations
  34. GRB 020625, optical observations
  35. GRB 020625: Optical observations
  36. GRB 020531: optical photometry of Chandra sources
  37. GRB020625 (=H2081): A Long Burst Localized by HETE
  38. HETE #2081: Optical observations
  39. The Probable Host Galaxy of GRB/XRF 020427
  40. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  41. AXP 1E2259+586: quasi-simultaneous optical observation
  42. AXP 1E2259+586 optical observations
  43. Fading Optical Source in the Field of GRB020531
  44. GRB 020531, INT+WFC deep optical upper limits
  45. GRB020405: polarimetric observations
  46. GRB 020531, simultaneous optical observations
  47. GRB 020604, optical observations
  48. GRB020604, optical observations
  49. GRB020531 Optical observations with TAROT
  50. GRB020531 Optical observations with TAROT
  51. GRB 020418, optical/near-IR observations
  52. GRB020531 Optical Observations
  53. GRB020531: Observations with the Chandra X-ray Observatory
  54. GRB 020603: Optical Observations
  55. GRB 020603: Optical observations
  56. GRB 020531 optical observations with TAROT
  57. GRB020531, optical observations
  58. GRB020531: optical observations
  59. GRB020531, optical observation
  60. GRB020531(=H2042): Optical Observations
  61. GRB020531(=H2042): Optical Observations
  62. GRB020531: Optical observations
  63. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  64. GRB 020525: Optical Observations
  65. GRB020525, optical observations
  66. HETE Observations of GX354-0 (= MXB1728-34, so-called "Slow
  67. HST detection of the likely host galaxy of GRB 020124
  68. GRB020321 : Optical observations.
  69. GRB020331: Third Epoch and Revised Second Epoch Optical
  70. The end of BSAX GRB activities
  71. GRB 020418: Optical observations
  72. GRB 020124: Optical observations
  73. GRB 020418: Optical observations
  74. GRB 020409: Optical Observations
  75. GRB 020409, 2-nd epoch optical observations at Terskol.
  76. GRB 020409: Optical observations
  77. GRB 020409, No Optical Detection to R = 22
  78. GRB 020409: No Evidence for an Optical Afterglow
  79. GRB 020409, 2nd epoch optical observations
  80. GRB 020331 Kyoto observation on March 31
  81. GRB 020409, No Optical Detection to R = 20
  82. GRB 020409: Optical observations
  83. GRB 020410, optical observations
  84. GRB 020409, optical observations
  85. GRB 020409: Optical Observations
  86. GRB020406(?), optical observations
  87. GRB020410, optical observations
  88. X-ray afterglow of GRB020321
  89. GRB020331: Confirmation of Afterglow Candidate with Magellan
  90. GRB020405: VLT optical observations and V band decay slope
  91. GRB020331 optical observations with RIMOTS
  92. GRB020124 optical observations with RIBOTS/RIMOTS
  93. GRB020331: Optical Observations of Afterglow Candidate
  94. GRB020406(?), optical observations
  95. GRB020405: VLT optical observations
  96. Revised Photometry of the Optical Afterglow of GRB 020405
  97. GRB 020331: Candidate Optical Afterglow
  98. GRB 020405: Decay index
  99. GRB020405, Radio Observations
  100. Fading Optical Afterglow and Possible Host Galaxy of GRB 020405

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