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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"

18334 results found.

  1. GRB021211: Kiso Observations
  2. GRB 021201, optical observations
  3. GRB021211: Optical observations
  4. GRB 021201 (short/hard), NOT observations
  5. Chandra observation of the IPN error box of GRB021201 (short/hard)
  6. GRB 021211, R- and I-band observations
  7. GRB021211 - Upper limits from recent and historical observations
  8. IPN triangulation of GRB021206 (small error box)
  9. GRB021201, BVRcIc field photometry
  10. GRB 021201: BOOTES simultaneous optical observations
  11. IPN triangulation of GRB021201 (short/hard burst, small error box)
  12. GRB021004, late time optical observations
  13. IPN BURST POSITION
  14. IPN triangulation of GRB021125 (INTEGRAL BURST)
  15. GRB021125 : A long GRB localized by INTEGRAL
  16. GRB 021112: Afterglow or Variable Star?
  17. GRB021113: optical observations at Bisei
  18. GRB 021113: Evidence for a Dark Optical Afterglow
  19. GRB021112, BVRI field photometry
  20. GRB 021112: Variable Source in R-band search
  21. GRB021112: Optical Observations
  22. GRB 021113: Optical observations
  23. GRB 021112: RAPTOR Observations
  24. GRB 021113: Optical Observations
  25. GRB 021016: Optical Observations
  26. GRB021104(=H2434): A Long, X-Ray-Rich GRB Localized by HETE
  27. GRB021104: optical observations
  28. Detection of activity from SGR 1900+14 with the RXTE/PCA
  29. GRB 021004: VRI observations at TNG: possible break
  30. IPN triangulation of GRB021014 (large error box)
  31. IPN triangulation of GRB021013 (two small error boxes)
  32. XRF 020903: flattening of the optical light curve.
  33. GRB021004, UBVRcIc field photometry update
  34. GRB 021004: Optical/NIR Observations
  35. GRB 021004: Additional V-band Polarimetric Observations
  36. GRB021004: optical observation
  37. GRB 021004: Host Galaxy Star Formation Rate
  38. GRB 021004: WC wind?
  39. IPN triangulation of GRB021007 (annulus)
  40. GRB021004: BVRc photometry
  41. GRB021004 radio observation
  42. GRB 021004: Optical Photometry at 2.5 Days
  43. GRB 021004: polarimetric observations
  44. GRB 021004: V-band Polarimetric Observations
  45. GRB021004: Update Bisei photometric data
  46. GRB 021004 radio observation
  47. GRB 021004: Optical Photometry at 1.5 Days
  48. GRB021004, BVRcIc field photometry
  49. GRB 021004 radio search
  50. XRF020903, BVRI field photometry
  51. GRB021004(=H2380): A Long GRB Localized by HETE in Near-Real Time
  52. XRF020903: TNG and Asiago photometry
  53. XRF 020903: Correction to GCN 1560
  54. XRF 020903: VRI observations
  55. XRF 020903: R band observations
  56. IPN triangulation of GRB020923 (two error boxes)
  57. GRB 020305: HST/STIS observations
  58. XRF 020903: optical observation at Kyoto
  59. GRB020322 : HST/STIS observations
  60. XRF 020903: Optical observations
  61. IPN triangulation of GRB020904
  62. INTEGRAL GRBs added to GCN
  63. GRB020812: negative optical observations
  64. GRB 020812: optical observation at Kyoto University
  65. Second epoch K band imaging of GRB 020819
  66. GRB 020813 : HST observations
  67. GRB 020812: early time optical observation at Ouda Station
  68. GRB020813: Magellan BVRI Photometry
  69. GRB 020819: Optical observations
  70. K band observation of GRB 020819
  71. GRB020813: optical and NIR observations
  72. GRB020813: Fading X-ray Afterglow Observed with Chandra
  73. GRB020813, UBVRI field calibration
  74. Polarimetry of GRB020813: evidence for variability
  75. GRB020812: optical observations
  76. GRB020813: High-Resolution Optical Observations
  77. GRB020813: Early Time Magnitude
  78. GRB020812: optical observations
  79. GRB020813, optical observations
  80. GRB020813, astrometric position
  81. GRB 020812 optical observation
  82. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  83. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  84. HST Imaging of the Host of GRB 011121
  85. GRB020801, optical afterglow candidate
  86. Further refinement to IPN error box for GRB020531
  87. GRB020331: Late-time Optical Light Curve (re-submission)
  88. GRB020331: Late-time Optical Light Curve
  89. GRB 020410: Discovery of Probable OT by HST
  90. IPN triangulation of GRB020708
  91. GRB 020705: Optical observations
  92. GRB 020625, optical observations
  93. GRB 020625: Optical observations
  94. GRB 020531: optical photometry of Chandra sources
  95. GRB020625 (=H2081): A Long Burst Localized by HETE
  96. The Probable Host Galaxy of GRB/XRF 020427
  97. GRB/XRF 020427, detection of an underlying system with the VLT
  98. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  99. AXP 1E2259+586 optical observations
  100. Fading Optical Source in the Field of GRB020531

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