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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"

19860 results found.

  1. GRB 021004: Host Galaxy Star Formation Rate
  2. GRB021004: NIR and Optical observations
  3. GRB 021004: Optical measurement at OHP
  4. GRB 021004: optical spectroscopy
  5. IPN triangulation of GRB021007 (annulus)
  6. GRB021004: BVRc photometry
  7. GRB021004 radio observation
  8. GRB 021004: Optical Photometry at 2.5 Days
  9. GRB 021004: polarimetric observations
  10. GRB 021004: V-band Polarimetric Observations
  11. GRB021004: Update Bisei photometric data
  12. GRB 021004 radio observation
  13. GRB 021004: Optical Observations
  14. GRB 021004: Optical Photometry at 1.5 Days
  15. GRB021004, Optical Observations
  16. GRB021004, BVRcIc field photometry
  17. GRB 021004: Optical observations
  18. GRB 021004: optical counterpart
  19. GRB 021004, optical observations
  20. GRB 021004 radio search
  21. GRB 021004: steepening of the optical decay slope
  22. XRF020903, BVRI field photometry
  23. GRB021004: optical observations at Nyrola
  24. GRB021004: optical observations at Bisei
  25. GRB 021004: Kyoto observation
  26. GRB021004(=H2380): A Long GRB Localized by HETE in Near-Real Time
  27. XRF020903: TNG and Asiago photometry
  28. GRB 020903: Optical observations at RIKEN
  29. XRF 020903: Correction to GCN 1560
  30. XRF 020903: VRI observations
  31. GRB 020903: correction to GCN 1557
  32. XRF 020903: R band observations
  33. XRF 020903: Supernova
  34. IPN triangulation of GRB020923 (two error boxes)
  35. GRB 020305: HST/STIS observations
  36. Confirmation of IPN error box for GRB020910
  37. IPN triangulation of GRB020910
  38. Single IPN error box for GRB020904
  39. XRF 020903: optical observation at Kyoto
  40. GRB020322 : HST/STIS observations
  41. XRF 020903: Optical observations
  42. IPN triangulation of GRB020904
  43. GRB020903(=H2314): An X-Ray Flash Localized by HETE
  44. INTEGRAL GRBs added to GCN
  45. SGR1900+14 burst localized by HETE
  46. GRB020813: High-resolution optical spectroscopy
  47. GRB020812: negative optical observations
  48. GRB 020812: optical observation at Kyoto University
  49. Second epoch K band imaging of GRB 020819
  50. GRB 020813 : HST observations
  51. GRB 020812: early time optical observation at Ouda Station
  52. GRB020813: VRI Decay Slopes
  53. GRB020813: Magellan BVRI Photometry
  54. GRB 020819: Optical observations
  55. IPN triangulation of GRB020819 (HETE 2275)
  56. GRB020813: optical and NIR observations
  57. GRB020813: Fading X-ray Afterglow Observed with Chandra
  58. GRB020813, UBVRI field calibration
  59. Polarimetry of GRB020813: evidence for variability
  60. GRB020812: optical observations
  61. GRB020813: High-Resolution Optical Observations
  62. GRB 020812: optical observation at Bisei
  63. GRB020812: optical observations
  64. GRB 020813 : KISO multiband optical observations
  65. GRB020813, optical observations
  66. IPN error box for GRB020813
  67. GRB020812: possible afterglow candidate
  68. GRB020812: possible afterglow candidate
  69. GRB020813, astrometric position
  70. GRB020813(=H2262): A Long, Bright Burst Localized by HETE in Near-Real Time
  71. GRB 020812 optical observation
  72. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  73. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  74. HST Imaging of the Host of GRB 011121
  75. GRB020801, optical afterglow candidate
  76. GRB020331: Late-time Optical Light Curve (re-submission)
  77. GRB020331: Late-time Optical Light Curve
  78. IPN triangulation of GRB020714
  79. IPN triangulation of GRB020715 (=GRB150702)
  80. IPN triangulation of GRB020714
  81. IPN triangulation of GRB150702
  82. GRB 020410: Discovery of Probable OT by HST
  83. IPN triangulation of GRB020708
  84. IPN triangulation of GRB020708
  85. Correction to IPN error box for GRB020706
  86. IPN triangulation of GRB020706
  87. GRB 020705: Optical observations
  88. GRB 020625, optical observations
  89. GRB 020625: Optical observations
  90. GRB 020531: optical photometry of Chandra sources
  91. The Probable Host Galaxy of GRB/XRF 020427
  92. GRB/XRF 020427, detection of an underlying system with the VLT
  93. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  94. SGR-like X-ray Bursts from AXP 1E 2259+586: follow-up
  95. AXP 1E2259+586: quasi-simultaneous optical observation
  96. AXP 1E2259+586 optical observations
  97. Fading Optical Source in the Field of GRB020531
  98. GRB 020531, INT+WFC deep optical upper limits
  99. GRB020405: polarimetric observations
  100. GRB 020531, simultaneous optical observations

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