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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"

23619 results found.

  1. GRB030329 (=H2652): A Long, Extremely Bright GRB Localized by the HETE WXM and SXC
  2. GRB 030329: precise position from Kyoto images
  3. GRB 030328 Optical Observations
  4. GRB030328: Decay index
  5. GRB 030328: optical observations
  6. GRB 030329: Optical afterglow fading
  7. GRB 030329: OT candidate
  8. GRB030328: optical spectroscopy at TNG
  9. GRB030328: optical photometry at the TNG
  10. GRB 030328, optical spectroscopy
  11. GRB 030328, optical observations
  12. GRB030328 (=H2650): A Long, Bright GRB Localized by the HETE WXM and SXC
  13. GRB030324 optical observation
  14. GRB030131, BVRcIc field photometry
  15. IPN triangulation of GRB030325 (final analysis)
  16. GRB030323: Detection on 2003/03/24
  17. IPN triangulation of GRB030326 (single small error box)
  18. GRB 030323: SARA Optical Observations
  19. IPN triangulation of GRB030325 (single small error box)
  20. IPN triangulation of GRB030325 (two small error boxes)
  21. GRB 030324: TAROT optical observations
  22. GRB030323: Upper limits from recent and historical observations.
  23. GRB030323 (=H2640): A Faint, Long GRB Localized by the HETE WXM and SXC
  24. GRB030324 (=H2641): A Long GRB Localized in Real Time by the HETE WXM
  25. GRB030324 (=H2641): A Long GRB Localized in Real Time by the HETE WXM
  26. GRB030324, BVRcIc field photometry
  27. GRB030323, BVRcIc field calibration
  28. GRB 030324, optical observations
  29. IPN triangulation of GRB030320B (annulus)
  30. IPN triangulation of GRB030320 (small error box)
  31. IPN triangulation of GRB030320
  32. Possible GRB 030320 localized by INTEGRAL
  33. IPN upper limit to a GRB associated with SN2003L
  34. IPN triangulation of GRB030317 (annulus)
  35. IPN triangulation of GRB030307 (annulus)
  36. GRB 030227: Optical limit at RIKEN
  37. IPN triangulation of GRB030306 (single small error box - REVISED)
  38. GRB030226: Optical observations at Asiago
  39. IPN triangulation of GRB030306 (single small error box)
  40. IPN triangulation of GRB030306 (two small error boxes)
  41. IPN triangulation of GRB030306 (intense; annulus only so far)
  42. GRB030226: Analysis of Chandra data
  43. GRB030226, BVRc observations
  44. GRB030227, optical observations
  45. GRB 030226: Ic Observations
  46. IPN triangulation of GRB030301 (annulus)
  47. IPN triangulation of GRB030228 (annulus)
  48. GRB030227, BVRcIc field photometry
  49. GRB030226, BVRcIc field calibration
  50. GRB 030227 optical afterglow
  51. GRB 030228, optical observations
  52. GRB 030226: Steep Decline
  53. GRB 030227: Confirmed Optical Afterglow (S1-A)
  54. GRB 030226: R band polarimetric observations
  55. GRB 030227: fading of candidate optical afterglow 'S1-A'
  56. GRB 20030226: Upper limits from recent and historical observations
  57. GRB 030227, possible optical counterpart of XMM-Newton source
  58. GRB030227 - faint tentative OT candidate
  59. GRB 030226, optical observations
  60. XMM-Newton observation of GRB030227
  61. GRB 030227: Kyoto optical observation
  62. GRB 030226 spectroscopy
  63. Possible break in the GRB 030226 light curve
  64. GRB 030226 : Predicted light curve
  65. IPN triangulation of GRB030225 (annulus)
  66. GRB030226: ESI spectroscopy
  67. GRB030226 (=U10893): A Long GRB Localized by the HETE WXM and SXC
  68. GRB 030226 simultaneous optical observations
  69. GRB 030226, optical observations
  70. GRB030226: optical observations and refined redshift
  71. GRB 030226 Optical Spectra and R,I,z' Imaging
  72. GRB 030217: Optical Observations at 4, 5, and 6 Days
  73. IPN triangulation of GRB030223 (annulus)
  74. IPN triangulation of GRB030220 (annulus)
  75. IPN triangulation of GRB030217 (small error box)
  76. IPN triangulation of GRB030215C (annulus)
  77. IPN triangulation of GRB030217 (annulus)
  78. IPN triangulation of GRB030215A and GRB030215B (annuli)
  79. GRB 030131: marginal optical detection
  80. IPN triangulation of GRB030206 (annulus)
  81. GRB 030204: Optical Observations
  82. GRB030204 field photometry
  83. GRB 030115: Optical Observations
  84. GRB 030204, optical observations
  85. IPN triangulation of GRB030204 (small error box)
  86. GRB030131: Kiso optical limit for corrected position
  87. Type Ic SN2003L (SN/GRB?), optical spectrum
  88. GRB030131: Kiso Observations
  89. IPN triangulation of GRB030131
  90. GRB030115: 1.2 mm upper limits with MAMBO @ IRAM 30m
  91. Type Ic SN2003L (SN/GRB?) Radio Observations
  92. IPN triangulation of GRB030127 (annulus)
  93. GRB030115 submm upper limit
  94. GRB 030115, simultaneous observations by BOOTES-1
  95. IPN triangulation of GRB030115C (large error box)
  96. GRB 021211: R-band observations at late-time
  97. IPN triangulation of GRB030115B (small error box)
  98. GRB030115 (=H2533): A Long GRB Localized by the HETE WXM and SXC
  99. IPN triangulation of GRB030115B (annulus)
  100. GRB030115: R-band observations at Asiago

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