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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"

20357 results found.

  1. GRB 021004: optical spectroscopy
  2. IPN triangulation of GRB021007 (annulus)
  3. GRB021004: BVRc photometry
  4. GRB021004 radio observation
  5. GRB 021004: Optical Photometry at 2.5 Days
  6. GRB 021004: polarimetric observations
  7. GRB 021004: V-band Polarimetric Observations
  8. GRB021004: Update Bisei photometric data
  9. GRB 021004 radio observation
  10. GRB 021004: Optical Observations
  11. GRB 021004: Optical Photometry at 1.5 Days
  12. GRB021004, Optical Observations
  13. GRB021004, BVRcIc field photometry
  14. GRB 021004: Optical observations
  15. GRB 021004: optical counterpart
  16. GRB 021004, optical observations
  17. GRB 021004 radio search
  18. GRB 021004: steepening of the optical decay slope
  19. XRF020903, BVRI field photometry
  20. GRB021004: optical observations at Nyrola
  21. GRB021004: optical observations at Bisei
  22. GRB 021004: Kyoto observation
  23. GRB021004(=H2380): A Long GRB Localized by HETE in Near-Real Time
  24. XRF020903: TNG and Asiago photometry
  25. GRB 020903: Optical observations at RIKEN
  26. XRF 020903: Correction to GCN 1560
  27. XRF 020903: VRI observations
  28. GRB 020903: correction to GCN 1557
  29. XRF 020903: R band observations
  30. XRF 020903: Supernova
  31. IPN triangulation of GRB020923 (two error boxes)
  32. GRB 020305: HST/STIS observations
  33. Confirmation of IPN error box for GRB020910
  34. IPN triangulation of GRB020910
  35. Single IPN error box for GRB020904
  36. XRF 020903: optical observation at Kyoto
  37. GRB020322 : HST/STIS observations
  38. XRF 020903: Optical observations
  39. IPN triangulation of GRB020904
  40. GRB020903(=H2314): An X-Ray Flash Localized by HETE
  41. INTEGRAL GRBs added to GCN
  42. SGR1900+14 burst localized by HETE
  43. GRB020813: High-resolution optical spectroscopy
  44. GRB020812: negative optical observations
  45. GRB 020812: optical observation at Kyoto University
  46. Second epoch K band imaging of GRB 020819
  47. GRB 020813 : HST observations
  48. GRB 020812: early time optical observation at Ouda Station
  49. GRB020813: VRI Decay Slopes
  50. GRB020813: Magellan BVRI Photometry
  51. GRB 020819: Optical observations
  52. IPN triangulation of GRB020819 (HETE 2275)
  53. GRB020813: optical and NIR observations
  54. GRB020813: Fading X-ray Afterglow Observed with Chandra
  55. GRB020813, UBVRI field calibration
  56. Polarimetry of GRB020813: evidence for variability
  57. GRB020812: optical observations
  58. GRB020813: High-Resolution Optical Observations
  59. GRB 020812: optical observation at Bisei
  60. GRB020812: optical observations
  61. GRB 020813 : KISO multiband optical observations
  62. GRB020813, optical observations
  63. IPN error box for GRB020813
  64. GRB020812: possible afterglow candidate
  65. GRB020812: possible afterglow candidate
  66. GRB020813, astrometric position
  67. GRB020813(=H2262): A Long, Bright Burst Localized by HETE in Near-Real Time
  68. GRB 020812 optical observation
  69. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  70. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  71. HST Imaging of the Host of GRB 011121
  72. GRB020801, optical afterglow candidate
  73. GRB020331: Late-time Optical Light Curve (re-submission)
  74. GRB020331: Late-time Optical Light Curve
  75. IPN triangulation of GRB020714
  76. IPN triangulation of GRB020715 (=GRB150702)
  77. IPN triangulation of GRB020714
  78. IPN triangulation of GRB150702
  79. GRB 020410: Discovery of Probable OT by HST
  80. IPN triangulation of GRB020708
  81. IPN triangulation of GRB020708
  82. Correction to IPN error box for GRB020706
  83. IPN triangulation of GRB020706
  84. GRB 020705: Optical observations
  85. GRB 020625, optical observations
  86. GRB 020625: Optical observations
  87. GRB 020531: optical photometry of Chandra sources
  88. The Probable Host Galaxy of GRB/XRF 020427
  89. GRB/XRF 020427, detection of an underlying system with the VLT
  90. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  91. SGR-like X-ray Bursts from AXP 1E 2259+586: follow-up
  92. AXP 1E2259+586: quasi-simultaneous optical observation
  93. AXP 1E2259+586 optical observations
  94. Fading Optical Source in the Field of GRB020531
  95. GRB 020531, INT+WFC deep optical upper limits
  96. GRB020405: polarimetric observations
  97. GRB 020531, simultaneous optical observations
  98. GRB020531: Second epoch Chandra observations
  99. GRB020604, optical observations
  100. GRB020604, BVRcIc field photometry

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