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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"

38012 results found.

  1. GRB 041006: Optical afterglow candidate
  2. XRF 020903: Observations of the Host Galaxy (authors)
  3. GRB 040924: Second Epoch WSRT Radio Observations
  4. radio observations, GRB 040924
  5. IBAS Alert 1991. Not a real GRB
  6. GRB040929,optical observation
  7. GRB040924,optical observation
  8. GRB040924, RTT150 optical observation
  9. GRB 040924: detection of possible host galaxy by Subaru
  10. GRB040924, RTT150 optical observation
  11. GRB040924: KAIT observations
  12. GRB040924: Afterglow magnitude at t=17.5hr
  13. GRB 040924: WSRT Radio Observations
  14. GRB 040924: NIR finding chart
  15. GRB040924 : Optical candidate observations at Lulin observatory
  16. GRB040924 : Optical candidate observations at Lulin observatory
  17. GRB 040924: Subaru NIR observation
  18. GRB 040924: RTT150 optical observations
  19. GRB 040924, optical follow-up
  20. IPN triangulation of GRB040924 (H3564)
  21. GRB 040924(=H3564): A Short, Bright GRB Localized in Real Time by HETE
  22. GRB040912(=H3557): Chandra Candidate X-ray Afterglow
  23. XRF040916: continuing decay of OT
  24. TAROT Observations of GRB 040916 (HETE #3558)
  25. XRF040916, optical observations
  26. XRF040916: Optical Transient Candidate by Subaru
  27. GRB040916 optical limits 17 min after GRB
  28. XRF 040912 (=H3557): Spectral and Temporal Properties
  29. XRF040916, Ic observations
  30. XRF040912, BVRcIc field calibration
  31. XRF040916, BVRcIc field calibration
  32. GRB040916: Archival optical observations
  33. GRB040912(=H3557): Observations with the Chandra X-ray Observatory
  34. GRB040916: Optical observations
  35. ROTSE-IIIb Observations of GRB 040916 (HETE #3558)
  36. GRB040912 (= H3557): Chandra Observations Scheduled
  37. GRB 040912: Optical Observations
  38. GRB/XRF040912,optical observations
  39. GRB 040912, BVRI observations
  40. Optical observations of GRB/XRF 040912 = HETE 3557
  41. An intense burst from SGR1806-20
  42. IBAS GRB Alerts 1978-1980
  43. Optical observations of field of GRB040912
  44. GRB040912 (= H3557): A Long GRB or XRF Localized by HETE
  45. GRB 040827: XMM-Newton data
  46. GRB040903 - A XRF?
  47. GRB040827: analysis of the XMM-Newton observation
  48. GRB 040903 - INTEGRAL data analysis
  49. IBAS Alert 1974. Not a real GRB
  50. Very bright burst detected from SGR 1806-20
  51. ROTSE-III Rapid Response to possible GRB 040903 (INTEGRAL #1972)
  52. Possible GRB 040903 - further analysis
  53. Possible GRB 040903 detected with INTEGRAL
  54. GRB 040827 - Radio Observations
  55. XMM-Newton Images of GRB 040827
  56. GRB 040827: optical and NIR observations at the VLT
  57. GRB 040827: UKIRT - 2nd epoch K-band imaging
  58. GRB 040827: 2nd epoch of Magellan K-band imaging
  59. GRB 040827: K imaging - no evidence of variability
  60. GRB 040827: Detection of NIR afterglow
  61. GRB 040827: Possible detection of optical afterglow
  62. GRB 040827: RTT150 optical observations
  63. GRB040825A: optical limit before GRB
  64. GRB 040825B: Optical observations
  65. GRB040827 optical observations
  66. GRB 040827 : Planned XMM-Newton observation
  67. GRB 040827 - Refined position
  68. GRB 040827 : peak flux
  69. GRB 040827 - A long GRB detected by INTEGRAL
  70. GRB040825B, BVRcIc field photometry
  71. GRB040825A, BVRcIc field photometry
  72. GCN GRB OBSERBATION REPORT
  73. GRB 040825A,optical observations
  74. Increase of SGR 1806-20 activity
  75. GRB 040825A: Optical observations.
  76. GRB040825B: Correction to GCN 2657
  77. GRB 040825: Optical observations
  78. GRB 040812: Second epoch CXO Observations
  79. GRB040823,optical observation
  80. Triangulation of GRB 040816 (Konus-Wind - Helicon-Coronas-F)
  81. XRF 040812: optical observation at VLT
  82. GRB 040812: Optical counterparts of CXO sources
  83. XRF040812: possible afterglow
  84. CXO observation of GRB 040812
  85. IPN/HETE localizations of GRB040810 (=H3489)
  86. GRB 040812: Keck and LCO optical observations
  87. GRB 040812: Keck and LCO observations
  88. GRB 040812: radio observations
  89. GRB040812, optical/IR observations
  90. Konus-Wind observation of GRB040810 (=H3489)
  91. GRB 040812: a long GRB detected by INTEGRAL
  92. GRB 040810: Optical observations of a limited region
  93. IPN/HETE triangulation of GRB040802 (=H3485)
  94. GRB 040730, infrared observations
  95. GRB 040730: Optical observations
  96. GRB 040730: a long GRB detected with INTEGRAL
  97. Ongoing activity of SGR 1806-20
  98. GRB040624: optical monitoring at TNG
  99. Cancellation of IBAS/INTEGRAL GRB alerts
  100. IBAS Alert 1836: NOT a real GRB

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