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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"

23687 results found.

  1. GRB041219: Prompt Optical Observations from ROTSE-IIIb
  2. GRB 041219 - A long GRB detected by INTEGRAL
  3. GRB 041217: PROMPT Observations
  4. GRB 041218 - A long GRB detected by integral
  5. GRB041217: NIR and optical observations with REM
  6. GRB041217: The First GRB Located On-Board Swift
  7. GRB041211: Faulkes Telescope continued optical monitoring
  8. Optical Transient in Lynx not a GRB
  9. Optical transient (GRB?) in Lynx
  10. GRB041211, Faulkes Telescope optical observation
  11. GRB041211, BVRcIc field calibration
  12. GRB 041211: Infrared Observations
  13. GRB 041211(=H3622): A Long GRB Localized by the HETE WXM and SXC
  14. GRB970815: Discovery of Optical Afterglow
  15. GRB041015: Near-Infrared observations
  16. GRB 040924: Afterglow Color
  17. GRB 041006: GETS Optical Afterglow Observation
  18. Summary of the recent bursts from SGR 1806-20
  19. GRB 041006: Optical Observations
  20. GRB041006: RTT150 Optical Observations
  21. GRB041015 : Multi epoch optical observations
  22. Bright bursts from SGR1806-20
  23. GRB 041016: BOOTES-2 simultaneous observation
  24. GRB041006: RTT150 Optical Observations
  25. GRB 041015: Optical Observations at Rikubetsu
  26. GRB041006: Near Infrared observations
  27. GRB 041016: Optical limit
  28. GRB040924, BVRcIc field calibration
  29. GRB041006: Fading X-ray Afterglow Observed with Chandra
  30. GRB041015 : Optical follow-up at Kiso
  31. GRB041006: VLT observations of the afterglow and host galaxy
  32. GRB041006: Optical observations and Potential host galaxy
  33. GRB041006, BVRcIc field calibration
  34. GRB 041006: SARA afterglow observations
  35. GRB041006, optical observation in CrAO
  36. Search for SN light in XRF 040912 with MEGACAM
  37. GRB 041006 Optical afterglow observations
  38. GRB 041006: BR observations with VATT
  39. GRB041006: Liverpool Telescope optical observations
  40. GRB041006: break in the light curve
  41. GRB 041006: Radio Observations
  42. GRB 041006 : optical follow-up observation at Lulin Observatory
  43. GRB 041006 : Optical follow-up observation at TAROT
  44. GRB041006: Optical photometry and spectroscopy at TNG
  45. GRB 041006: presice astrometry
  46. GRB 041006 : optical observation at Bisei
  47. GRB041006, optical observation
  48. GRB041006: MASTER optical observations
  49. GRB041006,optical observation
  50. GRB 041006 (=H3570): An X-Ray Rich GRB Localized in Real Time by HETE
  51. GRB 041006 : Optical follow-up observation at KISO
  52. Very strong outburst from SGR 1806-20 detected with INTEGRAL
  53. XRF 020903: Observations of the Host Galaxy (authors)
  54. XRF 020903: Observations of the Host Galaxy
  55. radio observations, GRB 040924
  56. GRB040929: MASTER optical observations
  57. Konus-Wind and Helicon-Coronas-F observations of GRB040924
  58. GRB040924, RTT150 optical observation
  59. GRB 040924: detection of possible host galaxy by Subaru
  60. GRB040924, RTT150 optical observation
  61. GRB040924: Afterglow magnitude at t=17.5hr
  62. GRB 040924: NIR finding chart
  63. GRB040924 : Optical candidate observations at Lulin observatory
  64. GRB040924 : Optical candidate observations at Lulin observatory
  65. GRB 040924: Subaru NIR observation
  66. GRB 040924: RTT150 optical observations
  67. GRB 040924, optical follow-up
  68. GRB040924: MASTER: OT decay
  69. GRB040924: MASTER Optical observations
  70. IPN triangulation of GRB040924 (H3564)
  71. GRB 040924(=H3564): A Short, Bright GRB Localized in Real Time by HETE
  72. XRF 040912: Radio Observations
  73. XRF 040916: Radio Observations
  74. GRB040912(=H3557): Chandra Candidate X-ray Afterglow
  75. XRF040916: continuing decay of OT
  76. TAROT Observations of GRB 040916 (HETE #3558)
  77. GRB040912(=H3557): Candidate Optical Afterglow
  78. XRF 040912, identification of CXO sources
  79. XRF 040912 (=H3557): Spectral and Temporal Properties
  80. XRF040912, BVRcIc field calibration
  81. XRF040916, BVRcIc field calibration
  82. XRF 040916, optical follow-up
  83. GRB040912(=H3557): Observations with the Chandra X-ray Observatory
  84. GRB040916 (= H3558): Improved Localization from HETE WXM
  85. GRB040916 (= H3558): A Long XRF Localized by HETE
  86. GRB 040912, BVRI observations
  87. Optical observations of GRB/XRF 040912 = HETE 3557
  88. An intense burst from SGR1806-20
  89. GRB040912 : Kiso Optical follow-up observation
  90. GRB040912 (= H3557): A Long GRB or XRF Localized by HETE
  91. Very bright burst detected from SGR 1806-20
  92. XMM-Newton Images of GRB 040827
  93. GRB 040827: 2nd epoch of Magellan K-band imaging
  94. GRB 040827: K imaging - no evidence of variability
  95. GRB 040827: Detection of NIR afterglow
  96. GRB 040827: RTT150 optical observations
  97. GRB040825A: optical limit before GRB
  98. MASTER: GRB040827 possible OT
  99. GRB 040825B: Optical observations
  100. GRB 040827 : peak flux

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