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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"

28116 results found.

  1. Possible GRB 040903 - further analysis
  2. GRB 040827 - Radio Observations
  3. XMM-Newton Images of GRB 040827
  4. GRB 040827: optical and NIR observations at the VLT
  5. GRB 040827: UKIRT - 2nd epoch K-band imaging
  6. GRB 040827: 2nd epoch of Magellan K-band imaging
  7. GRB 040827: K imaging - no evidence of variability
  8. GRB 040827: Detection of NIR afterglow
  9. GRB040827 XMM-Newton observation
  10. GRB040825A: optical limit before GRB
  11. GRB 040825B: Optical observations
  12. GRB 040827 : Planned XMM-Newton observation
  13. GRB040825B, BVRcIc field photometry
  14. GRB040825A, BVRcIc field photometry
  15. GCN GRB OBSERBATION REPORT
  16. GRB 040825A,optical observations
  17. GRB040825A: optical observations
  18. GRB040825B: optical observations
  19. MASTER: GRB040825b optical observation
  20. GRB 040825: Optical observations
  21. XRF040812: possible afterglow second Chandra observation
  22. GRB 040812: Second epoch CXO Observations
  23. GRB040823,optical observation
  24. XRF040812: GMRT observations
  25. XRF 040812: optical observation at VLT
  26. GRB 040812: Optical counterparts of CXO sources
  27. XRF040812: possible afterglow
  28. CXO observation of GRB 040812
  29. GRB 040812: radio observations
  30. GRB040812, optical/IR observations
  31. GRB 040812: a long GRB detected by INTEGRAL
  32. XRF040701: Optical Observations at ESO
  33. GRB 040730, infrared observations
  34. GRB 040730: a long GRB detected with INTEGRAL
  35. Ongoing activity of SGR 1806-20
  36. GRB040624: optical monitoring at TNG
  37. XRF 040701 - optical observations of the decaying Chandra source
  38. XRF040701: Second-Epoch Chandra Observations
  39. XRF040701: VLA Observations
  40. XRF040701: First-Epoch Chandra Observations
  41. GRB040624, optical observations
  42. GRB040706:observation at University of Miyazaki
  43. Optical Observations of GRB040624
  44. GRB 040624: optical observations at TNG and VLT
  45. MASTER: GRB 040624 optical observation after 0,48d
  46. GRB 040624, optical observations
  47. GRB 040624 - A long GRB detected with INTEGRAL
  48. GRB 030329: Rebrightening of hyperluminal ejecta.
  49. IPN Summary of SGR1806-20 Activity in 2004
  50. SGR 1806-20: no IR variability of the proposed counterparts
  51. MASTER:HETE Alert 3259 (SRG1806-20) optical observation
  52. SGR 1806-20, potential NIR counterpart
  53. GRB 040606: Optical observations
  54. MASTER: HETE Alert 3274 optical observation
  55. Activivty of SGR 1806-20
  56. GRB 040511, very fast decay?
  57. GRB 030324: Detection and Color of Host Galaxy
  58. GRB 040511: NIR observations with REM
  59. GRB040511: Candidate optical/NIR afterglow
  60. GRB 040511: ROTSE-III Rapid Optical Upper Limits
  61. GRB 040511: Second Epoch Optical Observations
  62. GRB 040511: Optical observations
  63. GRB 040511: Optical Observations
  64. GRB040511: Optical Observations
  65. GRB040511: Optical Observations
  66. Type Ic SN2001em (off-axis GRB jet?), optical spectrum
  67. GRB 040423 (=H3175): A Long GRB Localized by HETE
  68. GRB040422 : I-band follow-up observation at Lulin Observatory
  69. GRB 040422: ROTSE-IIIb Prompt Optical Limits
  70. GRB040422, BVRcIc field calibration
  71. GRB 040422,optical observation
  72. GRB 040422: a long GRB detected with INTEGRAL
  73. GRB 040403, deep optical observations
  74. MASTER: HETE Alert 3163, 3167 technical optical observation
  75. HETE/IPN localization of GRB040403A (=H3143, a long burst) and GRB040403B(=H3144, a short/hard burst)
  76. GRB 040403: Optical observations
  77. GRB 040403: a long GRB detected with INTEGRAL
  78. GRB040323: NIR Observations and Variable Object
  79. GRB 040319 (=H3128): An X-Ray-Rich GRB Localized by the HETE-2 WXM and SXC
  80. GRB 040323, a dark GRB ?
  81. GRB 040323: a long GRB detected with INTEGRAL
  82. GRB040223: Deep NIR NTT data re-analysis
  83. GRB 040223: XMM-Newton results
  84. GRB040223, improved XMM position
  85. GRB 031203, possible supernova
  86. MASTER: RXTE GRB040308 optical observation
  87. IBAS results on a burst from SGR1806-20
  88. INTEGRAL detection of activity from SGR1806-20
  89. RXTE GRB040229 optical observation: no candidate
  90. GRB 040228 Optical observations
  91. GRB040228 : KISO optical follow-up observation
  92. GRB 040223: Deep NIR NTT observations
  93. GRB 040223 : Optical observation (non-detection)
  94. XMM-Newton Images of GRB 040223
  95. GRB 040223, VLA observations
  96. GRB 040223: REM IJK Observations
  97. GRB 040223 XMM-Newton observation ...
  98. GRB 031203 XMM-Newton observation
  99. GRB 040223: further offline analysis
  100. GRB031111, optical observations

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