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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"

18345 results found.

  1. GRB 021004: polarimetric observations
  2. GRB 021004: V-band Polarimetric Observations
  3. GRB021004: Update Bisei photometric data
  4. GRB 021004: Optical Decay
  5. GRB 021004 radio observation
  6. GRB 021004: Optical Photometry at 1.5 Days
  7. GRB021004, BVRcIc field photometry
  8. GRB021004: Optical Spectroscopy
  9. GRB 021004 radio search
  10. XRF020903, BVRI field photometry
  11. GRB021004(=H2380): A Long GRB Localized by HETE in Near-Real Time
  12. XRF020903: TNG and Asiago photometry
  13. XRF 020903: Correction to GCN 1560
  14. XRF 020903: VRI observations
  15. XRF 020903: R band observations
  16. IPN triangulation of GRB020923 (two error boxes)
  17. IPN triangulation of GRB020914 - clarification and additional information
  18. GRB 020305: HST/STIS observations
  19. XRF 020903: optical observation at Kyoto
  20. GRB020322 : HST/STIS observations
  21. XRF 020903: Optical observations
  22. IPN triangulation of GRB020904
  23. INTEGRAL GRBs added to GCN
  24. SGR1900+14 burst localized by HETE
  25. GRB020812: negative optical observations
  26. GRB 020812: optical observation at Kyoto University
  27. Second epoch K band imaging of GRB 020819
  28. GRB 020813 : HST observations
  29. GRB 020812: early time optical observation at Ouda Station
  30. GRB020813: Magellan BVRI Photometry
  31. GRB 020819: Optical observations
  32. GRB020819(=H2275): A Long Burst Localized by the HETE WXM and SXC
  33. GRB020813: optical and NIR observations
  34. GRB020813: Fading X-ray Afterglow Observed with Chandra
  35. GRB020813, UBVRI field calibration
  36. Polarimetry of GRB020813: evidence for variability
  37. GRB020812: optical observations
  38. GRB020813: High-Resolution Optical Observations
  39. GRB020812: optical observations
  40. GRB020813, optical observations
  41. GRB020813, astrometric position
  42. GRB020813(=H2262): A Long, Bright Burst Localized by HETE in Near-Real Time
  43. GRB 020812 optical observation
  44. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  45. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  46. HST Imaging of the Host of GRB 011121
  47. GRB020801, optical afterglow candidate
  48. GRB020331: Late-time Optical Light Curve (re-submission)
  49. GRB020331: Late-time Optical Light Curve
  50. IPN triangulation of GRB020714
  51. IPN triangulation of GRB150702
  52. GRB 020410: Discovery of Probable OT by HST
  53. IPN triangulation of GRB020708
  54. GRB 020705: Optical observations
  55. GRB 020625, optical observations
  56. GRB 020625: Optical observations
  57. GRB 020531: optical photometry of Chandra sources
  58. GRB020625 (=H2081): A Long Burst Localized by HETE
  59. The Probable Host Galaxy of GRB/XRF 020427
  60. GRB/XRF 020427, detection of an underlying system with the VLT
  61. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  62. AXP 1E2259+586 optical observations
  63. Fading Optical Source in the Field of GRB020531
  64. GRB 020531, INT+WFC deep optical upper limits
  65. SGR-like Bursts from the AXP 1E 2259+586
  66. GRB020405: polarimetric observations
  67. GRB 020531, simultaneous optical observations
  68. GRB 020604, optical observations
  69. GRB020531: Second epoch Chandra observations
  70. GRB020604, optical observations
  71. GRB020604, BVRcIc field photometry
  72. GRB020603, BVRcIc field observations
  73. GRB020531, BVRcIc field photometry
  74. IPN triangulation of GRB020604
  75. GRB020531 Optical Observations
  76. GRB020531: Observations with the Chandra X-ray Observatory
  77. GRB020531, optical observations
  78. GRB020531: optical observations
  79. GRB020531(=H2042): Optical Observations
  80. GRB020531(=H2042): Optical Observations
  81. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  82. GRB020525, optical observations
  83. HETE Observations of GX354-0 (= MXB1728-34, so-called "Slow
  84. GRB020405 field photometry at ESO
  85. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  86. XRF 020427
  87. GRB 020410, Radio Observations
  88. GRB 020124: Optical observations
  89. GRB020405: VLT observations of the OT environment
  90. IPN triangulation of GRB020413
  91. GRB020405: predicted break
  92. GRB 020409: No Evidence for an Optical Afterglow
  93. GRB 020331 Kyoto observation on March 31
  94. X-ray afterglow of GRB020321
  95. GRB020331 optical observations with RIMOTS
  96. GRB020124 optical observations with RIBOTS/RIMOTS
  97. GRB020406(?), optical observations
  98. GRB020405, Radio Observations
  99. GRB 020405, U-band observations
  100. GRB020331 NIR observation at KPNO (re-submission)

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