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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

45679 results found.

  1. GRB030328: R optical observation
  2. GRB030328: X-ray Afterglow Observed with Chandra
  3. GRB 030323: Gemini South VRI obsevations.
  4. GRB030329: Optical observations
  5. GRB030329 optical observations
  6. GRB030329:optical observations by MASTER
  7. GRB 030329: optical observations
  8. GRB 030329, R-band observations
  9. GRB 030329: OT B and R photometry, decline rate
  10. GRB030329: Upper limits from recent and historical observations.
  11. GRB030329 (=H2652): A Long, Extremely Bright GRB Localized by the HETE WXM and SXC
  12. RXTE detection of GRB 030329 afterglow
  13. GRB 030329: Optical Afterglow Observations
  14. GRB 030329: precise position from Kyoto images
  15. GRB 030328 Optical Observations
  16. GRB030328: Decay index
  17. GRB 030328: Optical observations
  18. GRB 030328: optical observations
  19. GRB 030329: Optical afterglow fading
  20. GRB 030329 follow-up
  21. GRB 030329: Optical afterglow candidate
  22. GRB 030329: OT candidate
  23. GRB 030329: Optical afterglow candidate
  24. GRB 030328: OT photometry
  25. GRB030328: optical spectroscopy at TNG
  26. GRB030328: optical photometry at the TNG
  27. VLT spectra of GRB 030328
  28. GRB 030328, optical spectroscopy
  29. GRB 030328, optical observations
  30. GRB030328 (=H2650): A Long, Bright GRB Localized by the HETE WXM and SXC
  31. GRB 030328: Optical observations
  32. GRB 030328: Optical afterglow candidate
  33. GRB030323 optical observations
  34. GRB030324 optical observation
  35. GRB030131, BVRcIc field photometry
  36. Possible GRB030323 localized by INTEGRAL
  37. IPN triangulation of GRB030325 (final analysis)
  38. GRB030323: Detection on 2003/03/24
  39. IPN triangulation of GRB030326 (single small error box)
  40. GRB 030323: SARA Optical Observations
  41. IPN triangulation of GRB030325 (single small error box)
  42. GRB030324, optical observations
  43. GRB030324, optical observations
  44. IPN triangulation of GRB030325 (two small error boxes)
  45. GRB 030324: TAROT optical observations
  46. GRB030323: V, R, I photometry
  47. GRB 030324 (HETE #2641): Optical observations
  48. GRB030324, Optical Observations
  49. GRB030323: Upper limits from recent and historical observations.
  50. GRB030323 (=H2640): A Faint, Long GRB Localized by the HETE WXM and SXC
  51. GRB030324 (=H2641): A Long GRB Localized in Real Time by the HETE WXM
  52. GRB030324 (=H2641): A Long GRB Localized in Real Time by the HETE WXM
  53. VLT/FORS2 spectra of GRB 030323
  54. GRB030323, ROTSE-III detection of possible optical counterpart
  55. GRB030323, optical observations
  56. GRB030324, BVRcIc field photometry
  57. GRB030323, possible optical counterpart
  58. GRB030323, BVRcIc field calibration
  59. GRB 030324 optical observations
  60. GRB 030320: Optical Observations
  61. GRB 030324, optical observations
  62. IPN triangulation of GRB030320B (annulus)
  63. IPN triangulation of GRB030320 (small error box)
  64. IPN triangulation of GRB030320
  65. Possible GRB 030320 localized by INTEGRAL
  66. GRB030226, addendum to GCN 1892
  67. IPN upper limit to a GRB associated with SN2003L
  68. IPN triangulation of GRB030317 (annulus)
  69. IPN triangulation of GRB030307 (annulus)
  70. GRB 030227: Optical limit at RIKEN
  71. GRB 030226 Optical observations
  72. IPN triangulation of GRB030306 (single small error box - REVISED)
  73. GRB030226: Optical observations at Asiago
  74. IPN triangulation of GRB030306 (single small error box)
  75. IPN triangulation of GRB030306 (two small error boxes)
  76. IPN triangulation of GRB030306 (intense; annulus only so far)
  77. GRB 030226: Optical observations
  78. GRB030226: Analysis of Chandra data
  79. IPN triangulation of GRB030304 (annulus)
  80. GRB 030227: Optical observations
  81. GRB030226, BVRc observations
  82. Chandra detection of the X-ray afterglow of GRB 030226
  83. GRB 030226, further optical/NIR imaging
  84. GRB030227, optical observations
  85. GRB 030226: Ic Observations
  86. GRB030227: Kiso optical upper limit
  87. IPN triangulation of GRB030301 (annulus)
  88. IPN triangulation of GRB030228 (annulus)
  89. GRB030227, BVRcIc field photometry
  90. GRB030226, BVRcIc field calibration
  91. 030302: NOT A GRB
  92. 030228: NOT A GRB
  93. GRB 030228, optical observations
  94. GRB 030226: Steep Decline
  95. GRB 030227: Confirmed Optical Afterglow (S1-A)
  96. GRB 030226: R band polarimetric observations
  97. GRB 030226: Optical observations
  98. GRB 030227: fading of candidate optical afterglow 'S1-A'
  99. GRB030227:Optical observations
  100. GRB 20030226: Upper limits from recent and historical observations

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