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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"

32688 results found.

  1. GRB030329: Near Infrared Observations
  2. GRB 030324: Optical and NIR Observations
  3. GRB 030328, optical photometry
  4. GRB030329: R band light curve by MASTER
  5. GRB030329 - Light curve flattening
  6. GRB 030329: SARA Optical Observations
  7. GRB 030324, optical search
  8. GRB030329 - near contemporaneous optical limits from CONCAM
  9. GRB030329: R and B observations
  10. GRB 030329, optical observations
  11. GRB030329: Optical observations
  12. GRB030328: X-ray Fading and Spectrum Measured with Chandra
  13. GRB030329a: detection by Konus-Wind
  14. GRB 030329: Light curve observed during the change of its slope.
  15. GRB030329, BVRcIc field photometry
  16. GRB030329, SPM optical observations
  17. GRB 030329: Optical Decay
  18. Redshift of GRB 030329
  19. GRB030329: ROTSE network observes steepening of decay curve
  20. GRB 030329, optical photometry
  21. GRB 030329: Optical decay and synthesis
  22. GRB030329 optical observations
  23. GRB030329: optical spectroscopy with the TNG
  24. GRB 030329: Radio Observations
  25. GRB 030329, optical spectroscopy
  26. GRB 030329: still bright
  27. GRB 030329: Optical pre-Imaging
  28. GRB 030329: visual observations
  29. GRB 030329: Upper limit from 5.6 hours before trigger
  30. GRB030328: R optical observation
  31. GRB030328: X-ray Afterglow Observed with Chandra
  32. GRB 030323: Gemini South VRI obsevations.
  33. GRB030329: Optical observations
  34. GRB030329:optical observations by MASTER
  35. GRB 030329: optical observations
  36. GRB 030329, R-band observations
  37. GRB 030329: OT B and R photometry, decline rate
  38. GRB030329: Upper limits from recent and historical observations.
  39. GRB030329 (=H2652): A Long, Extremely Bright GRB Localized by the HETE WXM and SXC
  40. GRB 030329: Optical Afterglow Observations
  41. GRB 030329: precise position from Kyoto images
  42. GRB 030328 Optical Observations
  43. GRB030328: Decay index
  44. GRB 030328: Optical observations
  45. GRB 030328: optical observations
  46. GRB 030329: Optical afterglow fading
  47. GRB 030328: OT photometry
  48. GRB030328: optical spectroscopy at TNG
  49. GRB030328: optical photometry at the TNG
  50. VLT spectra of GRB 030328
  51. GRB 030328, optical spectroscopy
  52. GRB 030328, optical observations
  53. GRB030328 (=H2650): A Long, Bright GRB Localized by the HETE WXM and SXC
  54. GRB 030328: Optical observations
  55. GRB 030328: Finding chart
  56. GRB030323 optical observations
  57. GRB030131, BVRcIc field photometry
  58. IPN triangulation of GRB030325 (final analysis)
  59. GRB030323: Detection on 2003/03/24
  60. GRB 030323: SARA Optical Observations
  61. IPN triangulation of GRB030325 (single small error box)
  62. GRB030324, optical observations
  63. GRB030324, optical observations
  64. GRB 030324: TAROT optical observations
  65. GRB030323: V, R, I photometry
  66. GRB 030324 (HETE #2641): Optical observations
  67. GRB030324, Optical Observations
  68. GRB030323: Upper limits from recent and historical observations.
  69. GRB030323 (=H2640): A Faint, Long GRB Localized by the HETE WXM and SXC
  70. GRB030324 (=H2641): A Long GRB Localized in Real Time by the HETE WXM
  71. GRB030324 (=H2641): A Long GRB Localized in Real Time by the HETE WXM
  72. VLT/FORS2 spectra of GRB 030323
  73. GRB030323, ROTSE-III detection of possible optical counterpart
  74. GRB030323, optical observations
  75. GRB030323, possible optical counterpart
  76. GRB 030324 optical observations
  77. GRB 030320: Optical Observations
  78. IPN triangulation of GRB030320 (small error box)
  79. IPN triangulation of GRB030320
  80. GRB030226, addendum to GCN 1892
  81. IPN upper limit to a GRB associated with SN2003L
  82. GRB 030227: Optical limit at RIKEN
  83. GRB 030226 Optical observations
  84. IPN triangulation of GRB030306 (single small error box - REVISED)
  85. GRB030226: Optical observations at Asiago
  86. IPN triangulation of GRB030306 (two small error boxes)
  87. GRB 030226: Optical observations
  88. GRB030226: Analysis of Chandra data
  89. GRB 030227: Optical observations
  90. GRB030226, BVRc observations
  91. Chandra detection of the X-ray afterglow of GRB 030226
  92. GRB 030226, further optical/NIR imaging
  93. GRB 030226: Ic Observations
  94. GRB030227: Kiso optical upper limit
  95. GRB030227, BVRcIc field photometry
  96. GRB030226, BVRcIc field calibration
  97. GRB 030227 optical afterglow
  98. GRB 030226: Steep Decline
  99. GRB 030227: Confirmed Optical Afterglow (S1-A)
  100. GRB 030226: R band polarimetric observations

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