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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"

37724 results found.

  1. GRB041006: Optical photometry and spectroscopy at TNG
  2. GRB 041006: presice astrometry
  3. GRB041006 (= H3570): Chandra Observations In Progress
  4. GRB 041006 : optical observation at Bisei
  5. GRB041006 (=HETE3570): optical observations
  6. ROTSE-IIIa Observations of GRB 041006
  7. GRB041006, submillimetre observations
  8. GRB041006: MASTER optical observations
  9. GRB 041006: Optical decay
  10. GRB 041006 (=H3570): An X-Ray Rich GRB Localized in Real Time by HETE
  11. GRB 041006 : Optical follow-up observation at KISO
  12. GRB 041006: Finding chart
  13. GRB 041006: Optical afterglow candidate
  14. XRF 020903: Observations of the Host Galaxy (authors)
  15. GRB 040924: Second Epoch WSRT Radio Observations
  16. radio observations, GRB 040924
  17. IBAS Alert 1991. Not a real GRB
  18. GRB040929,optical observation
  19. GRB040924,optical observation
  20. GRB040924, RTT150 optical observation
  21. GRB 040924: detection of possible host galaxy by Subaru
  22. GRB040924, RTT150 optical observation
  23. GRB040924: KAIT observations
  24. GRB040924: Afterglow magnitude at t=17.5hr
  25. GRB 040924: WSRT Radio Observations
  26. GRB 040924: NIR finding chart
  27. GRB040924 : Optical candidate observations at Lulin observatory
  28. GRB040924 : Optical candidate observations at Lulin observatory
  29. GRB 040924: Subaru NIR observation
  30. GRB 040924: RTT150 optical observations
  31. GRB 040924, optical follow-up
  32. IPN triangulation of GRB040924 (H3564)
  33. GRB 040924(=H3564): A Short, Bright GRB Localized in Real Time by HETE
  34. GRB040912(=H3557): Chandra Candidate X-ray Afterglow
  35. XRF040916: continuing decay of OT
  36. TAROT Observations of GRB 040916 (HETE #3558)
  37. XRF040916, optical observations
  38. XRF040916: Optical Transient Candidate by Subaru
  39. GRB040916 optical limits 17 min after GRB
  40. XRF 040912 (=H3557): Spectral and Temporal Properties
  41. XRF040916, Ic observations
  42. XRF040912, BVRcIc field calibration
  43. XRF040916, BVRcIc field calibration
  44. GRB040916: Archival optical observations
  45. GRB040912(=H3557): Observations with the Chandra X-ray Observatory
  46. GRB040916: Optical observations
  47. ROTSE-IIIb Observations of GRB 040916 (HETE #3558)
  48. GRB040912 (= H3557): Chandra Observations Scheduled
  49. GRB 040912: Optical Observations
  50. GRB/XRF040912,optical observations
  51. GRB 040912, BVRI observations
  52. Optical observations of GRB/XRF 040912 = HETE 3557
  53. An intense burst from SGR1806-20
  54. IBAS GRB Alerts 1978-1980
  55. Optical observations of field of GRB040912
  56. GRB040912 (= H3557): A Long GRB or XRF Localized by HETE
  57. GRB 040827: XMM-Newton data
  58. GRB040903 - A XRF?
  59. GRB040827: analysis of the XMM-Newton observation
  60. GRB 040903 - INTEGRAL data analysis
  61. IBAS Alert 1974. Not a real GRB
  62. Very bright burst detected from SGR 1806-20
  63. ROTSE-III Rapid Response to possible GRB 040903 (INTEGRAL #1972)
  64. Possible GRB 040903 - further analysis
  65. Possible GRB 040903 detected with INTEGRAL
  66. GRB 040827 - Radio Observations
  67. XMM-Newton Images of GRB 040827
  68. GRB 040827: optical and NIR observations at the VLT
  69. GRB 040827: UKIRT - 2nd epoch K-band imaging
  70. GRB 040827: 2nd epoch of Magellan K-band imaging
  71. GRB 040827: K imaging - no evidence of variability
  72. GRB 040827: Detection of NIR afterglow
  73. GRB 040827: Possible detection of optical afterglow
  74. GRB 040827: RTT150 optical observations
  75. GRB040825A: optical limit before GRB
  76. GRB 040825B: Optical observations
  77. GRB040827 optical observations
  78. GRB 040827 : Planned XMM-Newton observation
  79. GRB 040827 - Refined position
  80. GRB 040827 : peak flux
  81. GRB 040827 - A long GRB detected by INTEGRAL
  82. GRB040825B, BVRcIc field photometry
  83. GRB040825A, BVRcIc field photometry
  84. GCN GRB OBSERBATION REPORT
  85. GRB 040825A,optical observations
  86. Increase of SGR 1806-20 activity
  87. GRB 040825A: Optical observations.
  88. GRB040825B: Correction to GCN 2657
  89. GRB 040825: Optical observations
  90. GRB 040812: Second epoch CXO Observations
  91. GRB040823,optical observation
  92. Triangulation of GRB 040816 (Konus-Wind - Helicon-Coronas-F)
  93. XRF 040812: optical observation at VLT
  94. GRB 040812: Optical counterparts of CXO sources
  95. XRF040812: possible afterglow
  96. CXO observation of GRB 040812
  97. IPN/HETE localizations of GRB040810 (=H3489)
  98. GRB 040812: Keck and LCO optical observations
  99. GRB 040812: Keck and LCO observations
  100. GRB 040812: radio observations

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