Skip to main content
New! BOOM Notices and Schema v7.0.0. 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"

35281 results found.

  1. GRB 020812: optical observation at Bisei
  2. GRB020813: optical observations; possible host galaxy
  3. GRB 020813, radio detection
  4. GRB 020812 : optical afterglow candidate
  5. Millimeter observation of GRB 020813
  6. GRB020812: optical observations
  7. GRB 020813 : KISO multiband optical observations
  8. IPN error box for GRB020813
  9. IPN triangulation of GRB020813
  10. GRB020812: possible afterglow candidate
  11. Early Time Limits for GRB020813
  12. GRB020812: possible afterglow candidate
  13. GRB020813, astrometric position
  14. Spectropolarimetry of GRB 020813
  15. GRB 020813 Afterglow Observations; Possible break
  16. GRB 020813: Absorption redshift
  17. GRB 020813 multiband optical observations
  18. GRB020813(=H2262): A Long, Bright Burst Localized by HETE in Near-Real Time
  19. GRB 020812 optical observation
  20. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  21. GRB 020715, optical observations
  22. GRB 020714, optical observations
  23. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  24. HST Imaging of the Host of GRB 011121
  25. GRB020801, optical afterglow candidate
  26. Further refinement to IPN error box for GRB020531
  27. GRB020331: Late-time Optical Light Curve (re-submission)
  28. GRB020331: Late-time Optical Light Curve
  29. GRB 020405: HST observations reveal red bump
  30. IPN triangulation of GRB020714
  31. IPN triangulation of GRB020715 (=GRB150702)
  32. IPN triangulation of GRB020714
  33. IPN triangulation of GRB150702
  34. GRB 020410: Discovery of Probable OT by HST
  35. GRB 020124, HST observations of the fading afterglow
  36. IPN triangulation of GRB020708
  37. IPN triangulation of GRB020708
  38. IPN error box for GRB020706
  39. IPN triangulation of GRB020706
  40. GRB 020705: Optical observations
  41. GRB 020625, optical observations
  42. GRB 020625: Optical observations
  43. GRB 020531: optical photometry of Chandra sources
  44. GRB020625 (=H2081): A Long Burst Localized by HETE
  45. The Probable Host Galaxy of GRB/XRF 020427
  46. GRB/XRF 020427, detection of an underlying system with the VLT
  47. GRB 020531, INT+WFC deep optical upper limits
  48. GRB020405: polarimetric observations
  49. GRB 020531, simultaneous optical observations
  50. GRB 020604, optical observations
  51. GRB 020531/Candidate Redshift
  52. GRB020531: Second epoch Chandra observations
  53. GRB020604, optical observations
  54. GRB020604, BVRcIc field photometry
  55. GRB020603, BVRcIc field observations
  56. GRB020531, BVRcIc field photometry
  57. GRB020531 Optical observations with TAROT
  58. GRB020531 Optical observations with TAROT
  59. GRB 020418, optical/near-IR observations
  60. GRB 020531, Radio Observations
  61. IPN triangulation of GRB020604
  62. GRB020531: Observations with the Chandra X-ray Observatory
  63. GRB 020603: Optical Observations
  64. GRB 020603, R-band observation
  65. Correction to IPN triangulation of GRB020603 (possible short/hard burst)
  66. GRB 020603: Optical observations
  67. IPN triangulation of GRB020603 (possible short/hard GRB)
  68. GRB 020531 optical observations with TAROT
  69. Refined IPN error box for GRB020531
  70. GRB020531, optical observations
  71. GRB020531(=H2042): Optical Observations
  72. IPN triangulation of the short, hard GRB020531 (=H2042)
  73. GRB020531(=H2042): Optical Observations
  74. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  75. GRB 020525: Optical Observations
  76. GRB020525, optical observations
  77. IPN detection of possible bursts from SGR1806-20
  78. IPN triangulation of GRB020525
  79. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  80. IPN triangulation of a burst from SGR1806-20
  81. GRB/XRF 020427, Radio Observations
  82. HST detection of the likely host galaxy of GRB 020124
  83. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  84. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  85. GRB020321 : Optical observations.
  86. GRB020427 BeppoSAX NFI Observation
  87. XRF 020427
  88. GRB020331: Third Epoch and Revised Second Epoch Optical
  89. The end of BSAX GRB activities
  90. GRB 020410, Radio Observations
  91. GRB 020418: Optical observations
  92. GRB 020124: Optical observations
  93. GRB 020418: Optical observations
  94. IPN triangulation of GRB020418
  95. GRB020405: VLT observations of the OT environment
  96. GRB020410: BeppoSAX NFI observations refined analysis
  97. GRB 020409: Optical Observations
  98. Mars Odyssey joins the IPN
  99. IPN triangulation of GRB020413
  100. GRB 020409, 2-nd epoch optical observations at Terskol.

Advanced

Download all Circulars as a .tar.gz archive:
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