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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

41622 results found.

  1. HETE GRB030329, correction to Rc Observations in Loiano
  2. GRB 030329: Optical limit (contemporaneous imaging)
  3. IPN triangulation of GRB030509 (small errror box)
  4. GRB030329: RTT150 optical observations
  5. GRB030329, BVRI photometry
  6. GRB030429, refiend optical brightness
  7. GRB 030329: Optical limit (contemporaneous photography)
  8. GRB030418, BVRcIc field photometry
  9. GRB 030429: Redshift of neighbor galaxy
  10. GRB030429, BVRcIc field photometry
  11. GRB 030329: High-Resolution Spectroscopy of the Host
  12. GRB030429: RTT150 optical observations, a possible host galaxy
  13. GRB030329: RTT150 optical observations and upper limit for a host
  14. GRB 030329: all-sky CCD images by K. Shiokawa immediately after the burst
  15. GRB030501, optical observation
  16. GRB030501 observation report
  17. GRB030329: RTT150 optical observations and upper limit for a host
  18. GRB 030429: Radio Observations
  19. GRB 030429: redshift from VLT spectroscopy
  20. GRB 030429: IR photometry with IRSF/SIRIUS
  21. GRB 030329 Optical Observations
  22. GRB030328, optical observation
  23. GRB030429: Optical Observations
  24. GRB 030501: TAROT possible candidate counterpart
  25. IPN triangulation of GRB030501 (IBIS event; annulus)
  26. GRB 030429: confirmation of afterglow candidate
  27. GRB030429, possible optical counterpart
  28. GRB030501 localized by INTEGRAL
  29. GRB030425: CrAO optical observation
  30. GRB 030329 Oprical observations in Rozhen observatory
  31. GRB 030429: ROTSE-III observations
  32. GRB 030324: Radio Observations
  33. GRB030329 observed as a sudden ionospheric disturbance (SID)
  34. SNeIa AS THE POSSIBLE PROGENITORS OF SHORT-DURATION GRBs.
  35. IPN triangulation of GRB030425 (single error box)
  36. GRB030329, SPM optical observations (Correction)
  37. GRB030329, SPM optical observations
  38. GRB 030329, the review of the sky area in plate archive (1950-1998)
  39. GRB 030329: Spectral Evolution of SN 2003dh
  40. Optical Observations of GRB 030418 with Magellan
  41. GRB 030329: optical spectropolarimetry at VLT
  42. GRB030329: optical polarization
  43. IPN triangulation of GRB030422 (two large error boxes)
  44. GRB 030329 3.5 and 6 cm radio observations at RTF-32 telescope
  45. GRB030329, optical observation
  46. MASTER:optical observations GRB030418
  47. MASTER:optical observations probable GRB030414
  48. GRB030329: 444 AAVSO Measurements
  49. MASTER:optical observations GRB030416
  50. ROTSE-III prompt optical detections of GRB 030418
  51. GRB030418: Upper limits from recent and historical observations.
  52. GRB030418: Kiso near infrared observations
  53. GRB 030418: Optical afterglow
  54. GRB 030418: Optical afterglow candidate
  55. GRB 030329 OT position
  56. GRB030329: Optical Observations
  57. OT GRB 030329: early UBVRcIc spectral evolution
  58. GRB030329, UBVRI polarimetry, R-polarization
  59. GRB 030329: SARA Optical Observations
  60. OT GRB 030329: early spectrum
  61. GRB030329: VR Photometry at TNG
  62. GRB030324: Candidate Optical Afterglow
  63. GRB 030413: Optical Observations
  64. GRB 030329 Rc observations
  65. Superluminal motion in GRB 030329 (Correction)
  66. Superluminal motion in GRB 030329
  67. GRB 030329 and SN 2003dh
  68. GRB030329, optical position
  69. GRB 030329 VLBA Observations
  70. IPN triangulation of GRB030406 (small error box)
  71. GRB 030329: BVRI photometry at Asiago
  72. GRB 030329, light curve flattens
  73. GRB 030329: VLT V-band photometry
  74. GRB 030329: Supernova Confirmed
  75. GRB030329: RTT150 optical observations
  76. GRB030329: Near Infrared Observations at Gunma
  77. GRB030329: HET spectroscopic monitoring
  78. Kiso observation of the GRB030329 at April 6
  79. GRB 030329, color evolution
  80. GRB030328, UBVRcIc field photometry
  81. GRB030329: Optical observcations
  82. GRB030329: BV photographic observations
  83. GRB 030329 Optical observations
  84. GRB 030329, color evolution
  85. GRB 030329: possible color change
  86. GRB030329: RTT150 optical observations
  87. GRB 030329: Supernova Spectrum Emerging
  88. GRB030329: Kiso B and R band observations
  89. GRB030329: RTT150 optical observation
  90. GRB030329: More AAVSO VR obs
  91. GRB030328: R upper limit after 6 hours by MASTER
  92. GRB 030329: BV photographic observations
  93. GRB 030329: SARA Optical Observations
  94. GRB 030329: SARA Optical Observations
  95. GRB 030329, BVRI photometry
  96. GRB030329: Optical observations
  97. SDSS 0.5m PT observations of GRB030329 (correction)
  98. SDSS 0.5m PT observations of GRB030329
  99. GRB 030329, Optical observations
  100. GRB030329, cessation of fading

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