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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"

42431 results found.

  1. GRB 040924, optical follow-up
  2. GRB040924: MASTER: OT decay
  3. GRB040924: MASTER Optical observations
  4. IPN triangulation of GRB040924 (H3564)
  5. GRB 040924(=H3564): A Short, Bright GRB Localized in Real Time by HETE
  6. GRB040924 (H3564): Optical afterglow candidate
  7. XRF 040912: Radio Observations
  8. XRF 040916: Radio Observations
  9. GRB040912(=H3557): Chandra Candidate X-ray Afterglow
  10. XRF040916: continuing decay of OT
  11. GRB040912(=H3557): Candidate Optical Afterglow
  12. XRF040916, optical observations
  13. XRF040916: Optical Transient Candidate by Subaru
  14. GRB040916 optical limits 17 min after GRB
  15. XRF 040912, identification of CXO sources
  16. XRF 040912 (=H3557): Spectral and Temporal Properties
  17. XRF040916: optical follow-up observations
  18. XRF040912, BVRcIc field calibration
  19. XRF040916, BVRcIc field calibration
  20. GRB040916: Archival optical observations
  21. XRF 040916, optical follow-up
  22. GRB040912(=H3557): Observations with the Chandra X-ray Observatory
  23. GRB040916: Optical observations
  24. GRB040916 (= H3558): Improved Localization from HETE WXM
  25. GRB040916 (= H3558): A Long XRF Localized by HETE
  26. GRB040912 (= H3557): Chandra Observations Scheduled
  27. GRB 040912: Optical Observations
  28. GRB/XRF040912,optical observations
  29. GRB 040912, BVRI observations
  30. Optical observations of GRB/XRF 040912 = HETE 3557
  31. An intense burst from SGR1806-20
  32. GRB040912 : Kiso Optical follow-up observation
  33. IBAS GRB Alerts 1978-1980
  34. Optical observations of field of GRB040912
  35. HETE 3557: Optical observations
  36. GRB040912 (= H3557): A Long GRB or XRF Localized by HETE
  37. GRB 040827: XMM-Newton data
  38. GRB040903 - A XRF?
  39. GRB040827: analysis of the XMM-Newton observation
  40. GRB040903, REM near-IR observation
  41. GRB 040903 - INTEGRAL data analysis
  42. Very bright burst detected from SGR 1806-20
  43. Possible GRB 040903 detected with INTEGRAL
  44. GRB 040827 - Radio Observations
  45. GRB040825A: Optical observations
  46. GRB040825A: Optical observations
  47. GRB 040827: optical and NIR observations at the VLT
  48. GRB 040827: UKIRT - 2nd epoch K-band imaging
  49. GRB 040827: 2nd epoch of Magellan K-band imaging
  50. GRB 040827: K imaging - no evidence of variability
  51. GRB 040827: Detection of NIR afterglow
  52. GRB 040827: Possible detection of optical afterglow
  53. GRB 040827: RTT150 optical observations
  54. GRB040827 XMM-Newton observation
  55. GRB040825A: optical limit before GRB
  56. MASTER: GRB040827 possible OT
  57. GRB 040825B: Optical observations
  58. GRB040827 optical observations
  59. GRB 040827 : Planned XMM-Newton observation
  60. GRB 040827 - Refined position
  61. GRB 040827 - A long GRB detected by INTEGRAL
  62. GRB040825B, BVRcIc field photometry
  63. GRB040825A, BVRcIc field photometry
  64. GCN GRB OBSERBATION REPORT
  65. GRB 040825A,optical observations
  66. GRB040825A: optical observations
  67. GRB040825B: optical observations
  68. GRB040825B (=H3510): An XRF Localized in Real Time by HETE
  69. GRB 040825A: Optical observations.
  70. MASTER: GRB040825a optical observation
  71. MASTER: GRB040825b optical observation
  72. GRB 040825: Optical observations
  73. XRF040812: possible afterglow second Chandra observation
  74. GRB 040812: Second epoch CXO Observations
  75. GRB040823,optical observation
  76. XRF040812: GMRT observations
  77. Triangulation of GRB 040816 (Konus-Wind - Helicon-Coronas-F)
  78. XRF 040812: optical observation at VLT
  79. GRB 040812: Optical counterparts of CXO sources
  80. XRF040812: possible afterglow
  81. CXO observation of GRB 040812
  82. Bursting activity from SGR 1806-20 detected with IBAS
  83. IPN/HETE localizations of GRB040810 (=H3489)
  84. GRB 040812: Keck and LCO optical observations
  85. GRB 040812: Keck and LCO observations
  86. GRB 040812: radio observations
  87. GRB040812, optical/IR observations
  88. GRB 040812: a long GRB detected by INTEGRAL
  89. GRB 040810: Optical observations of a limited region
  90. XRF040701: Optical Observations at ESO
  91. IPN/HETE triangulation of GRB040802 (=H3485)
  92. GRB 040730, infrared observations
  93. GRB 040730: Optical observations
  94. GRB 040730: a long GRB detected with INTEGRAL
  95. Ongoing activity of SGR 1806-20
  96. GRB040624: optical monitoring at TNG
  97. XRF 040701 - optical observations of the decaying Chandra source
  98. XRF040701: Second-Epoch Chandra Observations
  99. Cancellation of IBAS/INTEGRAL GRB alerts
  100. XRF040701: VLA Observations

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