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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"

19552 results found.

  1. IPN triangulation of GRB021007 (annulus)
  2. XRF 020903 spectrum
  3. GRB021004: BVRc photometry
  4. GRB 021004 redshift
  5. GRB021004 radio observation
  6. HETE fluences for GRB021004
  7. GRB 021004: Optical Photometry at 2.5 Days
  8. GRB 021004: polarimetric observations
  9. GRB 021004: V-band Polarimetric Observations
  10. GRB021004: Update Bisei photometric data
  11. GRB 021004: Optical Decay
  12. GRB 021004 radio observation
  13. GRB 021004: Optical Photometry at 1.5 Days
  14. GRB021004, BVRcIc field photometry
  15. GRB021004: Optical Spectroscopy
  16. GRB 021004 radio search
  17. XRF020903, BVRI field photometry
  18. GRB021004(=H2380): A Long GRB Localized by HETE in Near-Real Time
  19. XRF020903: TNG and Asiago photometry
  20. XRF 020903: Correction to GCN 1560
  21. XRF 020903: VRI observations
  22. XRF 020903: R band observations
  23. IPN triangulation of GRB020923 (two error boxes)
  24. IPN triangulation of GRB020914 - clarification and additional information
  25. GRB 020305: HST/STIS observations
  26. XRF 020903: optical observation at Kyoto
  27. GRB020322 : HST/STIS observations
  28. XRF 020903: Optical observations
  29. IPN triangulation of GRB020904
  30. INTEGRAL GRBs added to GCN
  31. SGR1900+14 burst localized by HETE
  32. GRB020812: negative optical observations
  33. GRB 020812: optical observation at Kyoto University
  34. Second epoch K band imaging of GRB 020819
  35. GRB 020813 : HST observations
  36. GRB 020812: early time optical observation at Ouda Station
  37. GRB020813: Magellan BVRI Photometry
  38. GRB 020819: Optical observations
  39. GRB020819(=H2275): A Long Burst Localized by the HETE WXM and SXC
  40. GRB020813: optical and NIR observations
  41. GRB020813: Fading X-ray Afterglow Observed with Chandra
  42. GRB020813, UBVRI field calibration
  43. Polarimetry of GRB020813: evidence for variability
  44. GRB020812: optical observations
  45. GRB020813: High-Resolution Optical Observations
  46. GRB020812: optical observations
  47. GRB020813, optical observations
  48. GRB020813, astrometric position
  49. GRB020813(=H2262): A Long, Bright Burst Localized by HETE in Near-Real Time
  50. GRB 020812 optical observation
  51. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  52. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  53. HST Imaging of the Host of GRB 011121
  54. GRB020801, optical afterglow candidate
  55. GRB020331: Late-time Optical Light Curve (re-submission)
  56. GRB020331: Late-time Optical Light Curve
  57. IPN triangulation of GRB020714
  58. IPN triangulation of GRB150702
  59. GRB 020410: Discovery of Probable OT by HST
  60. IPN triangulation of GRB020708
  61. GRB 020705: Optical observations
  62. GRB 020625, optical observations
  63. GRB 020625: Optical observations
  64. GRB 020531: optical photometry of Chandra sources
  65. GRB020625 (=H2081): A Long Burst Localized by HETE
  66. The Probable Host Galaxy of GRB/XRF 020427
  67. GRB/XRF 020427, detection of an underlying system with the VLT
  68. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  69. AXP 1E2259+586 optical observations
  70. Fading Optical Source in the Field of GRB020531
  71. GRB 020531, INT+WFC deep optical upper limits
  72. SGR-like Bursts from the AXP 1E 2259+586
  73. GRB020405: polarimetric observations
  74. GRB 020531, simultaneous optical observations
  75. GRB 020604, optical observations
  76. GRB020531: Second epoch Chandra observations
  77. GRB020604, optical observations
  78. GRB020604, BVRcIc field photometry
  79. GRB020603, BVRcIc field observations
  80. GRB020531, BVRcIc field photometry
  81. IPN triangulation of GRB020604
  82. GRB020531 Optical Observations
  83. GRB020531: Observations with the Chandra X-ray Observatory
  84. GRB020531, optical observations
  85. GRB020531: optical observations
  86. GRB020531(=H2042): Optical Observations
  87. GRB020531(=H2042): Optical Observations
  88. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  89. GRB020525, optical observations
  90. HETE Observations of GX354-0 (= MXB1728-34, so-called "Slow
  91. GRB020405 field photometry at ESO
  92. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  93. XRF 020427
  94. GRB 020410, Radio Observations
  95. GRB 020124: Optical observations
  96. GRB020405: VLT observations of the OT environment
  97. IPN triangulation of GRB020413
  98. GRB020405: predicted break
  99. GRB 020409: No Evidence for an Optical Afterglow
  100. GRB 020331 Kyoto observation on March 31

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