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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"

21263 results found.

  1. GRB021113 (=H2449): A Long GRB Localized by HETE
  2. GRB 021016: Optical Observations
  3. GRB021104(=H2434): A Long, X-Ray-Rich GRB Localized by HETE
  4. SGR1900+14 activity, November 2-4, 2002
  5. GRB021104: optical observations
  6. Detection of activity from SGR 1900+14 with the RXTE/PCA
  7. GRB 021004: optical observations
  8. GRB 021008, radio observations
  9. GRB 021008, optical observations
  10. IPN triangulation of GRB021014 (large error box)
  11. IPN triangulation of GRB021013 (two small error boxes)
  12. XRF 020903: flattening of the optical light curve.
  13. GRB021004, UBVRcIc field photometry update
  14. IPN triangulation of GRB021008 (two small error boxes)
  15. GRB021004 Chandra HETG Observations
  16. GRB 021004: Optical/NIR Observations
  17. GRB 021004: Additional V-band Polarimetric Observations
  18. GRB021004: optical observation
  19. GRB 021004: Host Galaxy Star Formation Rate
  20. GRB 021004: WC wind?
  21. IPN triangulation of GRB021008
  22. GRB 021004: Optical observations, AUDE network
  23. IPN triangulation of GRB021007 (annulus)
  24. GRB021004: BVRc photometry
  25. GRB021004 radio observation
  26. GRB 021004 continued IR fading
  27. GRB 021004: Optical Photometry at 2.5 Days
  28. GRB 021004: polarimetric observations
  29. GRB 021004: V-band Polarimetric Observations
  30. GRB021004: Update Bisei photometric data
  31. GRB 021004 radio observation
  32. GRB 021004: Optical Observations
  33. GRB021004: continued fading
  34. GRB 021004: Optical Photometry at 1.5 Days
  35. GRB021004, Optical Observations
  36. GRB021004, BVRcIc field photometry
  37. GRB021004: Optical Spectroscopy
  38. GRB 021004: Optical Observations
  39. GRB 021004, SPM optical observations
  40. GRB 021004, optical observations
  41. GRB 021004 radio search
  42. GRB021004: Upper limits from recent and historical observations
  43. XRF020903, BVRI field photometry
  44. XRF020903: TNG and Asiago photometry
  45. XRF 020903: Correction to GCN 1560
  46. XRF 020903: VRI observations
  47. XRF 020903: R band observations
  48. IPN triangulation of GRB020923 (two error boxes)
  49. IPN triangulation of GRB020914B
  50. IPN annulus for GRB020914B
  51. IPN triangulation of GRB020911 (2 large error boxes)
  52. GRB 020305: HST/STIS observations
  53. Single IPN error box for GRB020904
  54. XRF 020903: optical observation at Kyoto
  55. GRB020322 : HST/STIS observations
  56. XRF 020903: Optical observations
  57. IPN triangulation of GRB020904
  58. IPN detection of a burst from SGR1900+14
  59. INTEGRAL GRBs added to GCN
  60. GRB020812: negative optical observations
  61. GRB 020812: optical observation at Kyoto University
  62. Second epoch K band imaging of GRB 020819
  63. GRB020813, Baade 6.5m data now available
  64. GRB 020813 : HST observations
  65. GRB 020812: early time optical observation at Ouda Station
  66. GRB020813: Magellan BVRI Photometry
  67. GRB 020819: Optical observations
  68. GRB020813: optical and NIR observations
  69. GRB020813: Fading X-ray Afterglow Observed with Chandra
  70. GRB020813, UBVRI field calibration
  71. Polarimetry of GRB020813: evidence for variability
  72. GRB020812: optical observations
  73. GRB020813: High-Resolution Optical Observations
  74. GRB 020812: optical observation at Bisei
  75. GRB020812: optical observations
  76. GRB020813, optical observations
  77. GRB020813, astrometric position
  78. GRB 020812 optical observation
  79. GRB 020714, optical observations
  80. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  81. HST Imaging of the Host of GRB 011121
  82. GRB020801, optical afterglow candidate
  83. GRB020331: Late-time Optical Light Curve (re-submission)
  84. GRB020331: Late-time Optical Light Curve
  85. IPN triangulation of GRB020714
  86. IPN triangulation of GRB150702
  87. GRB 020410: Discovery of Probable OT by HST
  88. IPN triangulation of GRB020708
  89. IPN triangulation of GRB020708
  90. Correction to IPN error box for GRB020706
  91. IPN triangulation of GRB020706
  92. GRB 020705: Optical observations
  93. GRB 020625: Optical observations
  94. GRB 020531: optical photometry of Chandra sources
  95. The Probable Host Galaxy of GRB/XRF 020427
  96. GRB/XRF 020427, detection of an underlying system with the VLT
  97. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  98. AXP 1E2259+586 optical observations
  99. Fading Optical Source in the Field of GRB020531
  100. GRB 020531, INT+WFC deep optical upper limits

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